1985 code 32 problem
Thread Starter
Instructor
Joined: Apr 2013
Posts: 229
Likes: 2
1985 code 32 problem
When I crank it after setting overnight I get check engine light 32.Ok when it runs about 5 minutes I can cut it off then start it again and the check engine light goes away.If you drive it off an on throughout the day the light stays off.What could it be?
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
The fact that the CEL comes on when cold leads to a faulty EGR temperature switch. The code is set because the switch was closed at startup. It's fairly easy to verify.
1. Clear codes by disconnecting the battery ground.
2. With the engine cold, start the engine and run for 15 seconds or until the light comes on.
3. If code 32 is present, disconnect EGR switch connector and repeat the test.
4. If there's no code, the switch is bad or wiring to the switch is shorted. If there's a code 32 it could be the ECM.
1. Clear codes by disconnecting the battery ground.
2. With the engine cold, start the engine and run for 15 seconds or until the light comes on.
3. If code 32 is present, disconnect EGR switch connector and repeat the test.
4. If there's no code, the switch is bad or wiring to the switch is shorted. If there's a code 32 it could be the ECM.
Thread Starter
Instructor
Joined: Apr 2013
Posts: 229
Likes: 2
what about this?
http://www.autozone.com/autozone/par...8613_173005_0_
or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F
Which do I need?
http://www.autozone.com/autozone/par...8613_173005_0_
or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F
Which do I need?
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
The switch from Corvette Central is the right one. The switch is located at the base of the EGR valve. The EGR valve is on the center of the intake manifold under the plenum. The plenum must be removed to get access to it.
I would run the checks before replacing.
I would run the checks before replacing.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
A code indicates a problem SOMEWHERE in a circuit, not just that the sensor or switch associated with that circuit is actually faulty
Could be a wiring problem , not the switch itself
See
http://www.chevythunder.com/egr_code_32.htm
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
what about this?
http://www.autozone.com/autozone/par...8613_173005_0_
or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F
Which do I need?
http://www.autozone.com/autozone/par...8613_173005_0_
or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F
Which do I need?
The second one is the one you need.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
A code indicates a problem SOMEWHERE in a circuit, not just that the sensor or switch associated with that circuit is actually faulty
Could be a wiring problem , not the switch itself
See
http://www.chevythunder.com/egr_code_32.htm
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
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Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
Code 32 on my '87 referred correctly to the single wire ceramic sensor on the heat shrouded exhaust gas pipe (the one that runs over the passenger side valve cover) leading to the EGR valve.
5 minute job to replace..
Cheers..
5 minute job to replace..
Cheers..
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
It's a 5 minute job on an 87. On an 85 the sensor is located under the plenum. There's obviously more work involved to reach it.
Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
The EGR temperature switch is supposed to be open when the engine is cold. When it closes it completes the diagnostic circuit by grounding it. At startup the ECM looks for a grounded circuit. If there's voltage, the ECM sets a code 32. So based on the OP's symptoms there are three possibilities.1. Bad switch
2. Grounded switch wire
3. Bad ECM
Since this is only a startup code, it eliminates 90% of the troubleshooting tree.
Thread Starter
Instructor
Joined: Apr 2013
Posts: 229
Likes: 2
I found out the problem.The previous owner put new fuel injectors on it and the switch cable was under the bottom runner when he tightened it down.Stupid mother******.You cant move the cable out from under the runner.Guess i'll have to send it back to my garage.I ordered a new switch cable.
