If the egr valve was stuck open, the engine wouldn't idle. If the egr valve was stuck closed you may hear excessive pinging (spark knock) and in most vehicles, the check engine light would illuminate.
Yes, if the valve is bad. With the car idling, move the EGR valve diaphragm with your fingers. The engine should quit or want to quit. If it doesn't do this, it could be plugged up. Remove the EGR valve and clean any carbon deposits in the valve and also do the same on the engine side where the EGR valve is connected. If the EGR has never been removed before, it will probably have carbon buildup.
The location of the EGR valve on a 1987 to 1989 Chevy Celebrity depends on which engine the car has. If the car has the 2.8L V6 the EGR valve mounts to the plenum near the throttle body. If the car has the 2.5L 4 cylinder engine the EGR valve mounts in the center of the intake manifold near the valve cover.
I am not going to try to discourage you from doing your own repairs. What I hope to do is try to help you to save time and money. Has your car been in a repair shop and the EGR valve is guarenteed to fix your problem? I have had numerous occasions that a car was brought to me that Brand A auto parts got a code and said that it was the EGR valve. We scanned it and it was an EGR code and the valve was NOT bad. It was a 50 cent hose we replaced and NOT a $200.00 valve. It is to costly to assume.
Error code 32 for that car is EGR problem - during normal driving the car periodically runs an internal test of the EGR valve - it triggers the valve and watches for a change of exhaust stream composition, if the change does not happen, then the computer assumes the valve is bad and sets the code. If you get this code then if you are living in an area that does not do emissions testing you can ignore it. If you are living in an area that does do emissions testing then before replacing parts, take the car through emissions testing and see if it is really producing high NoX. If it is, the EGR valve is bad or the passages from the exhaust line that lead to the EGR valve are plugged. But sometimes the car ISN'T producing high NoX and the code gets set anyway. Legally, if your within emissions requirements then there's no reason to do anything about it. Note also that a standard tailpipe sniff at idle will not detect high NoX, only a dyno test will detect it. If your state's emissions testing has abandonded dyno testing, then even if your car has a bad EGR valve and is producing high NoX then it will not show up on an emissions test. Engine computers made after the late 1980's all test for proper EGR functioning so many states simply assume that if a bad EGR code is NOT set in the engine computer, that the car is producing acceptable NoX levels. The Chrysler engine computers of this vintage, in my experience, have a faulty algorithm for detecting a bad EGR valve. I have seen vehicles of this vintage that have a bad EGR valve and that fail emissions testing, that will not set a code. I've also seen vehicles that are producing acceptable NoX and that have a good EGR valve, that set this code intermittently.
Yes, the Diamante has an EGR solenoid. On any Mitsubishi, if the car has an egr valve, it has a solenoid to operate the valve. Just follow the vacuum line from the valve and it will go to the solenoid. There may be another one way valve between the valve and the solenoid, though. The solenoid is electronic.
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