Question about 1992 Oldsmobile Cutlass Ciera
I don't know if you understood the function of the EGR valve but you may have found the answer for your stalling problem.
The EGR (Exhaust Gas Recirculator) is vacuum controlled and should only be open after the engine is not under heavy demand anymore.
Once it is open, it allows a small amount of exhaust gases to be recirculated into the intake and reduces emissions (doesn't make much sense to me either).
This small amount of exhaust gas is tolerated by the engine once the revs are up a bit and it isn't lugging or accelerating hard, allowing the vacuum to recover and increase.
If the EGR valve has failed, these gases are toxic enough to the engine air-fuel mix to gag it and it stalls. Not much difference is noticed once up to speed.
Yours is probably stuck open, allowing exhaust fumes to gag the engine when at an idle.
The valve itself, is normally located near or on the exhaust manifold, which connects to a header then on to the rest of the exhaust system, finally the tail pipe.
It shouldn't be too difficult to see the manifold and the valve itself is a pretty common type of vacuum controlled mechanism so it will have a fat disc as part of it and there will (should) be a vacuum hose leading to it coming from the intake manifold.
The major difference between this and other similar controls is that the materials used are able to withstand much higher heat than is encountered in other control useage.
Since some heathens (not casting aspersions ;-) ) disconnect the vacuum hose from the valve or block the hose inside to disable the valve since it does cost some gas mileage and can cause the kind of problem you are currently having.
Once you have found the valve, trace the hose back to its pick-off, detach it, hold one finger over the pick-off and **** on the hose (yeah, it's probably grubby, deal with it or make your hubby or S.O. do it :-) ).
If the idle is not affected, the valve is not functioning.
Some can be cleaned of the built-up crud that accumulates, others must be replaced.
Let me know if it helps -
Posted on Jun 28, 2008
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