What are the typical signs of a bad EGR valve? ------------------ 87 Formula 350 13.94@96.67 98 Z28 1LE 13.15@107.59 1LE Owners Association

What your car is doing, I want to check out the control valve to see if its working right. AND I GOT a laptop, ran EASE tonight for the first time, its cool. You need to come by next weekend and let me work on the car again.

Too much EGR flow tends to weaken combustion, causing the engine to run roughly or stop. With too much EGR flow at idle, cruise, or cold operation, any of the following conditions may happen:
* Engine stops after cold start.
* Engine stops at idle after deceleration.
* Car surges during cruise.
* Rough idle.
If the EGR valve should stay open all of the time, the engine may not idle.

Too little or no EGR flow allows combustion temperatures to get too high during acceleration and load conditions. This could cause:
* Spark knock (detonation).
* Engine overheating.
* Emission test failure.

It's real easy to check. Just create a vacuum on the hose to it, and see if it leaks down (the valve closes). If it doesn't, the valve itself is ok.

I replaced mine the other month with a new one from GM. The car PINGED like hell.


LB9\5spd GTA