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ChevyTech · 08-09-2009, 07:54 AM

You’re welcome.

Before you buy a new valve do this test:

If you lift the EGR diaphragm with your fingers, with the engine idling, (being careful not to burn yourself or get your fingers caught in the EGR valve) you should hear a definite difference in the way it runs and the engine will most likely stall. If there is no difference you should look for plugged passages.

The passages in the intake manifold can get totally plugged up with carbon.

If you have a hand vacuum pump I can give you more tests to do.

If you find it does need an EGR valve, I would suggest only using a general motors replacement EGR valve.

08-09-2009, 07:54 AM	#10
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: '89 Chevy Trouble Codes 32,34,45 You’re welcome. Before you buy a new valve do this test: If you lift the EGR diaphragm with your fingers, with the engine idling, (being careful not to burn yourself or get your fingers caught in the EGR valve) you should hear a definite difference in the way it runs and the engine will most likely stall. If there is no difference you should look for plugged passages. The passages in the intake manifold can get totally plugged up with carbon. If you have a hand vacuum pump I can give you more tests to do. If you find it does need an EGR valve, I would suggest only using a general motors replacement EGR valve.