Very intermittant code 32 (EGR) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JohnO356 · 06-03-2008, 06:51 PM

Vehicle is 1988 C1500, 4.3, TH400 trans, about 65,000 miles. Last fall I replaced the EGR valve and the EGR solenoid. The EGR valve is the correct AC Delco valve (PN: 214-5072). A few months after replacing the valve I started to get an intermittant code 32. When I restart the engine the code disappears, and sometimes won't reappear for ~250-300 miles, and other times will return after just a few miles of highway driving. There is no noticeable change in the vehicle's driveability.

I have an AutoXray 6000, but don't claim to be the most knowledgeable user, LOL. After I bought it I found out it doesn't cover the EGR system. So I am wondering if there might be something else I could check with the scanner (comparing data with the light on to data with the light off). In other words, will this code 32 affect any other part of the emission system that might give a clue to the actual problem?

Also, anyone who has the solution to the problem, please let me know. I've been waiting 8 months for someone to tell me what's wrong, LOL. Thanks.

ChevyTech · 06-03-2008, 08:05 PM

Often a code 32 is an intermittent code.

Specific criteria / driving conditions must be met for a code 32 to get set.

I have seen a vehicle with the EGR passages totally blocked with carbon, and the vehicle owner said the light only comes on about once a week.

Basically the ECM cuts the EGR and expects to see a predetermined outcome.

The computer monitors the EGR effectiveness by momentarily de-energizing the EGR solenoid which shuts off the vacuum to the EGR valve. With the EGR closed, the fuel integrator counts must fall within calibrated window that is greater then during normal EGR operation. (The Mixture called for must change an expected amount). After failing the test twice a code 32 will be set.

Keep in mind that equipment modifications – exhaust mods, intake gaskets with crossover restrictions… can cause the “window” not to be met.

Try this test.

Try to manually open the EGR by lifting the diaphragm by hand at idle and see if the engine kills. Be careful not to burn your figures or get them caught. If the passages are plugged there will be no difference in the idle when you open the EGR valve.

This code usually gets set because the EGR does not work.

06-03-2008, 06:51 PM	#1
JohnO356 Registered User Join Date: Sep 2005 Location: Linden, NC Posts: 232	Very intermittant code 32 (EGR) Vehicle is 1988 C1500, 4.3, TH400 trans, about 65,000 miles. Last fall I replaced the EGR valve and the EGR solenoid. The EGR valve is the correct AC Delco valve (PN: 214-5072). A few months after replacing the valve I started to get an intermittant code 32. When I restart the engine the code disappears, and sometimes won't reappear for ~250-300 miles, and other times will return after just a few miles of highway driving. There is no noticeable change in the vehicle's driveability. I have an AutoXray 6000, but don't claim to be the most knowledgeable user, LOL. After I bought it I found out it doesn't cover the EGR system. So I am wondering if there might be something else I could check with the scanner (comparing data with the light on to data with the light off). In other words, will this code 32 affect any other part of the emission system that might give a clue to the actual problem? Also, anyone who has the solution to the problem, please let me know. I've been waiting 8 months for someone to tell me what's wrong, LOL. Thanks. Last edited by JohnO356; 06-03-2008 at 06:51 PM.

06-03-2008, 08:05 PM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: Very intermittant code 32 (EGR) Often a code 32 is an intermittent code. Specific criteria / driving conditions must be met for a code 32 to get set. I have seen a vehicle with the EGR passages totally blocked with carbon, and the vehicle owner said the light only comes on about once a week. Basically the ECM cuts the EGR and expects to see a predetermined outcome. The computer monitors the EGR effectiveness by momentarily de-energizing the EGR solenoid which shuts off the vacuum to the EGR valve. With the EGR closed, the fuel integrator counts must fall within calibrated window that is greater then during normal EGR operation. (The Mixture called for must change an expected amount). After failing the test twice a code 32 will be set. Keep in mind that equipment modifications – exhaust mods, intake gaskets with crossover restrictions… can cause the “window” not to be met. Try this test. Try to manually open the EGR by lifting the diaphragm by hand at idle and see if the engine kills. Be careful not to burn your figures or get them caught. If the passages are plugged there will be no difference in the idle when you open the EGR valve. This code usually gets set because the EGR does not work.



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