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Default Ford Ranger question

Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on it.
After ****ing around for a week, unable to start it, a friend changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping holes
(properly) to use the original intake. Im NOT getting a check engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

"In the history of mankind, there have always been men and women who's goal
in life is to take down nations. We have just elected such a man to run our
country." - David Lloyyd (2008)
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Default Ford Ranger question

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner


Fuel filter or dirty injectors ?
--
Snag
Learning keeps
you young !


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Posts: 259
Default Ford Ranger question

On Sep 22, 1:45*am, Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). *The current engine came out of a 2003, and has 75k miles on it..
After ****ing around for a week, unable to start it, a friend changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. *However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping holes
(properly) to use the original intake. Im NOT getting a check engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

"In the history of mankind, there have always been men and women who's goal
in life is to take down nations. We have just elected such a man to run our
country." - David Lloyyd (2008)


www.therangerstation.com for all things ranger related.

One thing that I have seen happen on other makes- small changes to the
timing reluctor/pickup can make the one in the new engine incompatible
with the computer.

And, check the fuel pressure. Idle but won't rev is a classic sign.

Dave
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Default Ford Ranger question

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner


Fuel filter or dirty injectors ?

HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
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Default Ford Ranger question

On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner


Fuel filter or dirty injectors ?

HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------




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Posts: 399
Default Ford Ranger question

A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.
A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar


On Thu, 22 Sep 2011 23:31:41 -0400, wrote:

On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

Fuel filter or dirty injectors ?

HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------

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Posts: 18,538
Default Ford Ranger question

On Thu, 22 Sep 2011 21:00:59 -0700, JR North
wrote:

A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.
A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar

A test light draws less than an injector - guaranteed - and the
driver is, in most cars today, a "peak and hold" driver that regulates
the current to the low resistance injector. And the Noid light WILL
flash if the injector circuit is firing. The drivers are generally not
"tri-state" so they are either on or off, so a logic probe won't tell
you anything a "noid light" can't. Unless you can explain it to me -
I've been working with EFI for years.
Yes - you CAN use a logic probe - but I don't understand what you
think it can tell me that the "noid" cannot. It definitely can't tell
me if the peak and hold is functioning. Pretty well need a scope for
that - and a storage scope would make the job a lot easier.

On Thu, 22 Sep 2011 23:31:41 -0400, wrote:

On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

Fuel filter or dirty injectors ?
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------


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Posts: 399
Default Ford Ranger question

OK. Most ECMs pull the ground circuit low for activation. The injector
power is usually through an external resistor block, or provided by
the ECM. With a noid, you have to disconnect the connector, and plug
in the noid. If, for instance, the driver for the injector circuit is
bad, there is an open or short in the circuit wiring, or there is a
problem with the power side, the noid won't flash. Of course, it will
flash if the circuit is good. I wasn't aware I implied it wouldn't.
But it does not provide any info on WHY it's not flashing.
A probe can look at both sides of the circuit, while the injector is
being pulsed. No disconnection, which is sometimes very difficult on
some systems, and stresses the wiring to boot. The H LED stays lit,
the L LED flashes as the driver pulls the circuit low.
I have spotted damaged output drivers, for instance, on VW/Audi power
stages that drive the coil packs. I Don't think my probe is
specifically designed this way, but the intensity of the indicator
LEDs will vary with the quality of the signal. A good low pull will
light the L LED fully. A leaky driver will show a dimmer LED.
MUCH info here. But I agree if you want the whole story, you need a
DSO.


JR
dweller in the cellar


On Fri, 23 Sep 2011 15:20:29 -0400, wrote:

On Thu, 22 Sep 2011 21:00:59 -0700, JR North
wrote:

A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.
A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar

A test light draws less than an injector - guaranteed - and the
driver is, in most cars today, a "peak and hold" driver that regulates
the current to the low resistance injector. And the Noid light WILL
flash if the injector circuit is firing. The drivers are generally not
"tri-state" so they are either on or off, so a logic probe won't tell
you anything a "noid light" can't. Unless you can explain it to me -
I've been working with EFI for years.
Yes - you CAN use a logic probe - but I don't understand what you
think it can tell me that the "noid" cannot. It definitely can't tell
me if the peak and hold is functioning. Pretty well need a scope for
that - and a storage scope would make the job a lot easier.

On Thu, 22 Sep 2011 23:31:41 -0400,
wrote:

On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar

When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

Fuel filter or dirty injectors ?
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------

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Posts: 18,538
Default Ford Ranger question

On Fri, 23 Sep 2011 17:44:20 -0700, JR North
wrote:

OK. Most ECMs pull the ground circuit low for activation. The injector
power is usually through an external resistor block, or provided by
the ECM.


MOST systems today do away with the resistor block and feed the
injectors "raw" 12 volt power - and ground the injector througha "peak
and hold" driver, which provides a full power spike to open the
injector, then clamps the current to a safe level, adequate only to
HOLD the injector open.
With a noid, you have to disconnect the connector, and plug
in the noid. If, for instance, the driver for the injector circuit is
bad, there is an open or short in the circuit wiring, or there is a
problem with the power side, the noid won't flash.

So the FIRST check is, is there power to the injection harness?
Easily proved with a test light or voltmeter
Of course, it will
flash if the circuit is good. I wasn't aware I implied it wouldn't.
But it does not provide any info on WHY it's not flashing.
A probe can look at both sides of the circuit, while the injector is
being pulsed. No disconnection, which is sometimes very difficult on
some systems, and stresses the wiring to boot.

How are you probing? Back probe through the weathertight connector,
or poking the wire??
The H LED stays lit,
the L LED flashes as the driver pulls the circuit low.
I have spotted damaged output drivers, for instance, on VW/Audi power
stages that drive the coil packs. I Don't think my probe is
specifically designed this way, but the intensity of the indicator
LEDs will vary with the quality of the signal. A good low pull will
light the L LED fully.


The "noid" will give the same indication of power level.
In IGNITION testing, there MAY be a case to be made for using the
logic probe. Generally, however, i just pulse the coil manually - if
it sparks well that way, and not with the ECU triggering it, you
question the ECU.

A leaky driver will show a dimmer LED.
MUCH info here. But I agree if you want the whole story, you need a
DSO.


JR
dweller in the cellar


On Fri, 23 Sep 2011 15:20:29 -0400, wrote:

On Thu, 22 Sep 2011 21:00:59 -0700, JR North
wrote:

A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.


And the outputs of the ECU are hardly what you would call "cmos level"
- nor are the noids anything special power-wize.
A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar

A test light draws less than an injector - guaranteed - and the
driver is, in most cars today, a "peak and hold" driver that regulates
the current to the low resistance injector. And the Noid light WILL
flash if the injector circuit is firing. The drivers are generally not
"tri-state" so they are either on or off, so a logic probe won't tell
you anything a "noid light" can't. Unless you can explain it to me -
I've been working with EFI for years.
Yes - you CAN use a logic probe - but I don't understand what you
think it can tell me that the "noid" cannot. It definitely can't tell
me if the peak and hold is functioning. Pretty well need a scope for
that - and a storage scope would make the job a lot easier.

On Thu, 22 Sep 2011 23:31:41 -0400,
wrote:

On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:

Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar

When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:

Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom

What the hell is it and how do I fix it?

I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.

Anyone have any ideas?

Gunner

Fuel filter or dirty injectors ?
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------


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Posts: 60
Default Ford Ranger question

I'm 77 and used to do a lot of automotive electrical work but have
been out of it for a while.
What is a "noid light"?
I tried to look it up on Google but only could determine that it is
some sort of fuel injector tester.
How did it get it's name?
What does it consist of?
How is it different from a test light?
Wondering minds want to know.

Engineman

On Sep 23, 7:41*pm, wrote:
On Fri, 23 Sep 2011 17:44:20 -0700, JR North

wrote:
OK. Most ECMs pull the ground circuit low for activation. The injector
power is usually through an external resistor block, or provided by
the ECM.


MOST systems today do away with the resistor block and feed the
injectors "raw" 12 volt power - and ground the injector througha "peak
and hold" driver, which provides a full power spike to open the
injector, then clamps the current to a safe level, adequate only to
HOLD the injector open.With a noid, you have to disconnect the connector, and plug
in the noid. *If, for instance, the driver for the injector circuit is
bad, there is an open or short in the circuit wiring, or there is a
problem with the power side, the noid won't flash.


* So the FIRST check is, is there power to the injection harness?
Easily proved with a test light or voltmeter Of course, it will
flash if the circuit is good. I wasn't aware I implied it wouldn't.
But it does not provide any info on WHY it's not flashing.
A probe can look at both sides of the circuit, while the injector is
being pulsed. No disconnection, which is sometimes very difficult on
some systems, and stresses the wiring to boot.


*How are you probing? Back probe through the weathertight connector,
or poking the wire??

The H LED stays lit,
the L LED flashes as the driver pulls the circuit low.
I have spotted damaged output drivers, for instance, on VW/Audi power
stages that drive the coil packs. I Don't think my probe is
specifically designed this way, but the intensity of the indicator
LEDs will vary with the quality of the signal. A good low pull will
light the L LED fully.


The "noid" will give the same indication of power level.
In IGNITION testing, there MAY be a case to be made for using the
logic probe. Generally, however, i just pulse the coil manually - if
it sparks well that way, and not with the ECU triggering it, you
question the ECU.









A leaky driver will show a dimmer LED.
MUCH info here. But I agree if you want the whole story, you need a
DSO.


JR
dweller *in the cellar


On Fri, 23 Sep 2011 15:20:29 -0400, wrote:


On Thu, 22 Sep 2011 21:00:59 -0700, JR North
wrote:


A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.


And the outputs of the ECU are hardly what you would call "cmos level"
- nor are the noids anything special power-wize.







A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar


A test light draws less than an injector - guaranteed - and the
driver is, in most cars today, a "peak and hold" driver that regulates
the current to the low resistance injector. And the Noid light WILL
flash if the injector circuit is firing. The drivers are generally not
"tri-state" so they are either on or off, so a logic probe won't tell
you anything a "noid light" can't. *Unless you can explain it to me -
I've been working with EFI for years.
Yes - you CAN use a logic probe - but I don't understand what you
think it can tell me that the "noid" cannot. It definitely can't tell
me if the peak and hold is functioning. Pretty well need a scope for
that - and a storage scope would make the job a lot easier.


On Thu, 22 Sep 2011 23:31:41 -0400, wrote:


On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:


Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" *You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:


Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). *The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. *However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom


What the hell is it and how do I fix it?


I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.


Anyone have any ideas?


Gunner


*Fuel filter or dirty injectors ?
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------




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Posts: 18,538
Default Ford Ranger question

On Sat, 24 Sep 2011 11:26:00 -0700 (PDT), engineman
wrote:

I'm 77 and used to do a lot of automotive electrical work but have
been out of it for a while.
What is a "noid light"?

It is a test light used for checking EFI. They come in a set - one for
each cyl (usually come in sets of 8(
I tried to look it up on Google but only could determine that it is
some sort of fuel injector tester.
How did it get it's name?

Short for "solenoid"
What does it consist of?

It is a bulb in a plastic lump that plugs into the injector plug.
How is it different from a test light?

Just in the format.
Wondering minds want to know.

Engineman

On Sep 23, 7:41Â*pm, wrote:
On Fri, 23 Sep 2011 17:44:20 -0700, JR North

wrote:
OK. Most ECMs pull the ground circuit low for activation. The injector
power is usually through an external resistor block, or provided by
the ECM.


MOST systems today do away with the resistor block and feed the
injectors "raw" 12 volt power - and ground the injector througha "peak
and hold" driver, which provides a full power spike to open the
injector, then clamps the current to a safe level, adequate only to
HOLD the injector open.With a noid, you have to disconnect the connector, and plug
in the noid. Â*If, for instance, the driver for the injector circuit is
bad, there is an open or short in the circuit wiring, or there is a
problem with the power side, the noid won't flash.


Â* So the FIRST check is, is there power to the injection harness?
Easily proved with a test light or voltmeter Of course, it will
flash if the circuit is good. I wasn't aware I implied it wouldn't.
But it does not provide any info on WHY it's not flashing.
A probe can look at both sides of the circuit, while the injector is
being pulsed. No disconnection, which is sometimes very difficult on
some systems, and stresses the wiring to boot.


Â*How are you probing? Back probe through the weathertight connector,
or poking the wire??

The H LED stays lit,
the L LED flashes as the driver pulls the circuit low.
I have spotted damaged output drivers, for instance, on VW/Audi power
stages that drive the coil packs. I Don't think my probe is
specifically designed this way, but the intensity of the indicator
LEDs will vary with the quality of the signal. A good low pull will
light the L LED fully.


The "noid" will give the same indication of power level.
In IGNITION testing, there MAY be a case to be made for using the
logic probe. Generally, however, i just pulse the coil manually - if
it sparks well that way, and not with the ECU triggering it, you
question the ECU.









A leaky driver will show a dimmer LED.
MUCH info here. But I agree if you want the whole story, you need a
DSO.


JR
dweller Â*in the cellar


On Fri, 23 Sep 2011 15:20:29 -0400, wrote:


On Thu, 22 Sep 2011 21:00:59 -0700, JR North
wrote:


A noid will tell you if the ECM is pulling the circuit low, but does
not tell you, if it doesn't flash, why. Also, noid's resistance and
current draw are valued to be compatable with CMOS output circuit
drivers. Regular test lights are not.


And the outputs of the ECU are hardly what you would call "cmos level"
- nor are the noids anything special power-wize.







A good probe does CMOS also, and very useful for checking both H and L
circuits. Also, req for most CMOS and TTL level electronic automotive
circuits. Incandesent test lights *may* have very high current draw,
and damage output drivers. Why take a chance.
JR
Dweller in the cellar


A test light draws less than an injector - guaranteed - and the
driver is, in most cars today, a "peak and hold" driver that regulates
the current to the low resistance injector. And the Noid light WILL
flash if the injector circuit is firing. The drivers are generally not
"tri-state" so they are either on or off, so a logic probe won't tell
you anything a "noid light" can't. Â*Unless you can explain it to me -
I've been working with EFI for years.
Yes - you CAN use a logic probe - but I don't understand what you
think it can tell me that the "noid" cannot. It definitely can't tell
me if the peak and hold is functioning. Pretty well need a scope for
that - and a storage scope would make the job a lot easier.


On Thu, 22 Sep 2011 23:31:41 -0400, wrote:


On Thu, 22 Sep 2011 19:22:46 -0700, JR North
wrote:


Throttle body switches are off line. The ECM thinks the throttle is
closed, so goes into decel fuel cut as the rpm passes the ck point.
Test this theory by checking an injector with a logic probe ( not a
test light).
JR
Dweller in the cellar


When checking the INJECTORS, a test light is OK - in fact the NORMAL
way of testing is to plug in a "noid light" Â*You are working with 12
volts. Typical "logic probes" are for use at TTL levels of +/- 5 volts


On Thu, 22 Sep 2011 07:03:40 -0500, "Snag"
wrote:


Gunner Asch wrote:
Ive just finished putting a low mileage 3.0 in my 2001 Ranger (225,000
miles). Â*The current engine came out of a 2003, and has 75k miles on
it. After ****ing around for a week, unable to start it, a friend
changed
the spark plug wires around (seems most of the online diagrams are
WRONG) and it started right up. Â*However..when adding throttle over
about 1500 rmp..it starts to lope...vroom...vroom...vroom...vroom


What the hell is it and how do I fix it?


I stuck on the original intake manifold after drilling and taping
holes (properly) to use the original intake. Im NOT getting a check
engine
light and my code reader is isnt showing any codes.


Anyone have any ideas?


Gunner


Â*Fuel filter or dirty injectors ?
HOME PAGE:
http://www.seanet.com/~jasonrnorth
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