On Saturday, April 3, 2021 at 8:28:00 PM UTC-4, micky wrote:
In alt.home.repair, on Sat, 03 Apr 2021 17:28:10 -0400, Clare Snyder
wrote:

On Sat, 03 Apr 2021 15:40:31 -0400, micky
wrote:

In alt.home.repair, on Sat, 3 Apr 2021 14:26:36 -0400, Ed Pawlowski
wrote:

On 4/3/2021 12:37 PM, micky wrote:
I know it's not the same vendor -- Wait, it is the SAME vendor -- so how
is it that on ebay there is one Denso ignition pack for a 2005 3.3L
Toyota engine for $70, and a 6-pack for $158?

https://www.ebay.com/itm/1-PC-OEM-DE...6/392934898333

https://www.ebay.com/itm/6-Pack-OEM-...E/233707357463


One says Toyota, the other says Lexus. Could be the same but you pay for
the single versus bulk pack?

BTW, I can't even get at the rear 3 ignition coils without taking out
the intake manifold and lots of little things.

It runs smoothly, as nice as ever afaict. Has plenty of acceleration and
power.

I erased the codes (cyls 1, 2, and random) and I'll wait to see if they
come back. (of course, they will.)

What is the price at a typucal auto parts store?
Chasing the o2 sensor problem and coil problem on the same car???
That combination of problems really scared me last night, and I had just
about given in and was going to take it somewhere, until I thought, It's
gonna cost me 1000 dollars or more.

The P0171 and P0174 started last year and the misfire problem, P0300,
P0301, P0302**, I only learned about yesterday. Last year, for the lean
mixture, I clenaed the MAF sensor with MAF Sensor Cleaner, replaced the
MAF sensor, replaced the PCV valve, inspected the air cleaner (which was
very clean), looked at length for vacuum leaks, inspected that big
plastic pipe from air cleanner to the next boxy thing, and maybe
something else.

**Actually, the Maintenannce dash light went on about 4 months ago, but
I didn't read the codes again at that time. Are the misfires really
going to damage my engine like one webpage said? So far it seems to run
the same.

I didn't check the fuel pump or filter or injectors, but the car had and
has loads of power and acceleration. Its only bad symptom is that it
stumbles a little as I leave a stop sign. But if I handle my foot just
right and don't try to get a jack-rabbit start, I can even avoid that.
Still, it's definitely a problem.

I figured since it has so much power and other-than-from-stopped easy
acceleration, it's not the fuel pump or filter or injectors. ?? And
there is no nipple on this car to connect a fuel pressure gauge.

That left the O2 sensors but I was in idiot mode and thought I should be
suspecting the downstream sensors which are both hard to replace without
a lift or at least ramps on flat ground. I read the meterial again and
IIUC it's the upstream sensors that matter here, and one of those is
easy to change. (The rear one is behind the engine, have to remove the
intake manifold etc. I think. I am scared to even start that.)

OTOH, since it's both banks, maybe there is some common cause but
unrelated to banks. OT3H, since both sensors are original and were 15
years old, maybe they both wore out.
99.999% chance it is neither the coil OR the O2 sensor. You most
likely have a small vacuum leak somewhere. Take it to a real mechanic
When this problem first started, I spend a lot of time looking for a
vacuum leak. I checked every hose and hose connection. They were all
firm and none were brittle. Then I didn't want to spray brake cleaner
like was suggested, so went around with an unlit but open propane torch,
sticking it everywhere I could find and waiting for the idle speed to
increase. It never did.

Just now I read that brake cleaner doesn't leave residue like I thought
it did. Should I start again looking for vacuum leaks with brake
cleaner?

Is there something else to do?

I never used one, but there are fog/smoke generators that you can hook up
that pump smoke into the system and you can see if any comes out. I've
read of people using fog machines that are made for dance floors and such.
Years ago when I looked I think you could find them on Ebay for maybe less
than $100. Then you'd have to make up some plumbing to pipe it in.

It's hard to find vacuum leaks because the hoses go all over the place and
the engine compartment is packed, you can't easily even see them all,
others go into the cabin, to the tranny, etc.