EGR stands for Exhaust gas relief valve... its all the emissions crap.
I dont know exactly what it does... but a bad one will cause a car to run
crappy.. my fathers 1991 E250 van had one go bad and it ran horrible until
he got it replaced.
Well best of luck.
The EGR is an acronym for Exhaust Gas Recirculation. Exhaust gases are
introduced into the combustion chamber to reduce the combustion temperatures
lowering the NOX emission. For the model engine you have they go bad in two
ways. Stuck open and closed. When in the open position it will cause rough idle,
stalls and low power. It can also drop fuel mileage. When stuck closed will
cause ping under heavy load, no other drivability symptom may appear. Depending
on how it fails, it may not cause a code.
.................. in simple laymans terms a percentage of the fumes flowing
through the exhaust are "recirculated" back into the engine to be burnt
again, this helps the ozone layer by reducing the HC's and CO levels your
this is done via the "EGR" valve located between the exhaust system and the
not quite sure about "lowering the combustion temperature". Introducing hot
exhaust gas back into the engine will increase temperature, however indeed
if faulty it may be either stuck in the open position which will cause a few
idling problems, or may be stuck closed in which case you may not notice any
problems at all.
You also change the mass of the air/fuel mixture. This changes the peak
temperature the combustion process can achieve. There is quite a lot of science
behind the reason for EGR. I would suggest before you post again, you have a
better understanding of what you are talking about.
I replaced a few on my '84 T-Bird with the 5.0L. They would carbon up and,
after a while, any little grain of crud flying by would stick, causing the
valve not to close properly. Highway was fine, for example, but when I'd
exit and stop at the light, the thing would chug and churn, usually dying.
Sometimes it would clear itself but I got good at revving the engine while
using an extra hose to pull vacuum and open the valve so the crud would go
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