DIYbanter - View Single Post - EPA caught VW cheating

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On 9/19/2015 7:38 PM, wrote:
On Sat, 19 Sep 2015 16:28:20 -0500, "." wrote:

Fuel additives and larger injectors can defeat the effectiveness
of emission controls, not that they'll necessarily increase power.

Bigger injectors will just be dialed back by the computer as the O2
sensors report a richer than optimum mixture. Too big and the engine
will go into "limp mode" because the engine remains too rich even with
the calibration at lean limit. Power will suffer.

You questioned how one could simply defeat emission controls.
You were provided with effective examples.

Pull off any number (EGR, PCV, Sensor ...) of wires, hoses,
or lines; one could also easily have multiple devices either
fail or disabled (that don't prevent the engines from running)
and significantly decrease the efficiency, and increase the
pollution output, of the engine.
Yes, but it will turn on the CEL and in many cases prevent the engine
from starting, even if it will run after starting. ANd it will run
like crap when it runs. NO incentive to do it.

Again, you questioned how one could simply defeat emission
controls. You were provided with effective examples.

so that what left the
manufacturer and what was on the road were not necessarilly the same.

And those that in any manner overrode emission controls were
an insignificant percentage of the motoring public.

You would be surprised how many Olds 350 rockets back in the mid
seventies had the timing significantly altered to eliminate
overheating when pulling a trailer, or how many "super six" mopars had
the carburetion and timing adjusted off-spec to get rid of
"driveability problems" - and how many "lean burn" mopars were
"converted" to non-lean-burn without changing the camshaft (which was
required if you were going to be anywhere CLOSE to passing emissions)
and how many AIR systems were removed from GM engines - and how many
EGR systems were disconnected ---- just for starters. (under the
mistaken idea that they could get better mileage by simply removing
them)

I'm only surprised at the length of your run-on sentence.

I worked tune-up and electrical in '74-'76 at a Mopar dealer.
Remember the red, sometimes off white, idle mixture limiting,
plastic stops that covered the screw heads on Carter's (which
also had an issue with warping, requiring a retro-fit brace)?
Periodic rough idle complaints on new cars were sometimes
addressed by first subjecting such engines to a full Sun Scope
(on a rail) diagnostic. Were no issues found, I would remove
them, as emissions testing was neither available nor required.
Never once had a comeback or complaint.

Used to remove the limit caps, adjust to spec (or modified spec) and
then replace the caps, as required by law. We did the adjustment using
the exhaust gas analyzer that was part of the Sun, Allen, Marquette,
or Rotunda diagnostic scope I was using at the time. Quite a few were
off spec from the factory.

"Periodic rough idle complaints on new cars ..." I knew I heard
that somewhere. After verifying everything else was within
spec, and given that emission testing was not mandatory, the
scope, a vacuum gauge, and a tach was all that was really
necessary for an experienced mechanic to adjust the idle
mixture.

AMC,Chrysler, Mazda and Toyota
dealershipsduring that time period, as well as independent repair
shops

The numbers WERE significant.\

No they were not. "Cleaner air" evolved from unleaded fuel,
catalytic converters, fuel injection, and overall drive train
computer management of hundreds of millions, not the
hobbyists' thousands, of vehicles on US roads.

It wasn't hobbyists - it was "hack mechanics" who didn't know
anything about emmission controls and defeated them in an attempt to
"solve" problems. - some real and some immagined.

Laughable ignorance. No, what led to cleaner air was unleaded
fuel, catalytic converters, multiport fuel injection and overall
drive train computer management (MAF, MAP, IAT ... sensors,
among others) of HUNDREDS of millions of cars replacing
the archaic Kettering ignition, centrifugal spark advance,
coil choke-manifold vacuum-non linear venturi based
carbureted engines. Sad that you don't seem to know and
understand something that fundamental.