1988 code 32
Thread Starter
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
1988 code 32
When Im on the freeway ONLY my SES light comes on. Everything and I mean everything is brand new. Doesnt make sense ? Would engine temps cause this EGR or code 32 to come on ? When I turn the car off the SES light does not come on. Only if Im on the freeway for 15-30 min.
Burning Brakes
Joined: Aug 2011
Posts: 878
Likes: 2
Here you go. I have this link stored as it has a good write up on trouble shooting EGR code 32. Mine is going bye bye eventually but it's a good thread. Cliff did a good job explaining it.
http://forums.corvetteforum.com/c4-g...-still-on.html
http://forums.corvetteforum.com/c4-g...-still-on.html
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Your ECM is calling for EGR (opening the EGR valve) and not seeing the response through the EGR switch in the EGR tube from RH exhaust header to intake base.
Check vac lines to/from the EGR Sol.
Check vac lines to/from the EGR Sol.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I was going to write a response but it looks like I already did...
On my car the EGR solenoid failed and the EGR valve was frozen shut. That's how I got the random error code 32 while cruising. I bought a cheapo EGR valve from AutoZone and fortunately I tested it with a vacuum pump before installing it because it leaked vacuum and didn't work right out of the box. There's an AC Delco EGR valve in my car now.
On my car the EGR solenoid failed and the EGR valve was frozen shut. That's how I got the random error code 32 while cruising. I bought a cheapo EGR valve from AutoZone and fortunately I tested it with a vacuum pump before installing it because it leaked vacuum and didn't work right out of the box. There's an AC Delco EGR valve in my car now.
Last edited by Cliff Harris; May 20, 2013 at 01:38 AM.
Thread Starter
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
I want to thank everyone for the help !!!!!!! I will look for an A/C Delco solenoid. I might just replace or at least check out the condition of my EGR temp sensor but I am sure I replaced it when the valve was replaced. Ouch $90 for a solenoid.
Last edited by C4in mesa; May 20, 2013 at 07:40 PM.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
BTW, I run a 160deg T-stat so my ECM will NEVER call for EGR while cruzing, since coolant temp must exceet 175deg F at steady speed before it will want EGR.
This might not work in your case as I well remember what a summer in Mesa is like...
This might not work in your case as I well remember what a summer in Mesa is like...
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Depends on the year. My car uses the MAT sensor to determine when to turn on EGR. I think that's true for all cars with the 1227165 ECM ('86 - '89).
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Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
My car uses the MAT sensor to determine when to turn on EGR.
My '88 GM Shop manual states that code 32 will be set if the EGR valve is detected closed under the following condtions:
-coolant temp > 176 deg F
-EGR duty cycle commanded is >75%
-TPS <1/2 throttle & >idle
-codes 21,22,33,34 not present
-all conditions above met for >4 minutes
It further states that: "The (EGR) duty cycle is determined by the ECM based on information from the coolant and mass air flow sensors and engine RPM.
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
On my '88 I had code 32 also.
I searched the forum and found that some people were able to fool the computer by a trick on the sensor on the egr tube. I tried that and could not get it to work.
On mine the problem was the EGR valve itself.
I tried a generic one from Advance Auto. It was bad. It would not hold a vacuum to operate the valve. Fortunately I tried it before I installed it. The store got a second one for me. The second one was also bad, plus it was the wrong valve for some other car in the correct box.
I got an AC Delco one from Rock Auto and it worked. No more light or codes.
Good luck.
I searched the forum and found that some people were able to fool the computer by a trick on the sensor on the egr tube. I tried that and could not get it to work.
On mine the problem was the EGR valve itself.
I tried a generic one from Advance Auto. It was bad. It would not hold a vacuum to operate the valve. Fortunately I tried it before I installed it. The store got a second one for me. The second one was also bad, plus it was the wrong valve for some other car in the correct box.
I got an AC Delco one from Rock Auto and it worked. No more light or codes.
Good luck.
Thread Starter
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
Do you have an '86 Vette or a '90-'91??
My '88 GM Shop manual states that code 32 will be set if the EGR valve is detected closed under the following condtions:
-coolant temp > 176 deg F
-EGR duty cycle commanded is >75%
-TPS <1/2 throttle & >idle
-codes 21,22,33,34 not present
-all conditions above met for >4 minutes
It further states that: "The (EGR) duty cycle is determined by the ECM based on information from the coolant and mass air flow sensors and engine RPM.
My '88 GM Shop manual states that code 32 will be set if the EGR valve is detected closed under the following condtions:
-coolant temp > 176 deg F
-EGR duty cycle commanded is >75%
-TPS <1/2 throttle & >idle
-codes 21,22,33,34 not present
-all conditions above met for >4 minutes
It further states that: "The (EGR) duty cycle is determined by the ECM based on information from the coolant and mass air flow sensors and engine RPM.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
As you see varying the RPM will avoid the code 32.
Since our cars have the EGR Temp switch, there is a way to fool the ECM into thinking it sees the correct feedback. Simply run a wire with a diode in line between the EGR Sol input from the ECM and the EGR Temp sw. Then when the ECM calls for EGR by energizing the EGR Sol that signal will immediately pull the EGR Temp sw line low, as though the sw had closed.
Since our cars have the EGR Temp switch, there is a way to fool the ECM into thinking it sees the correct feedback. Simply run a wire with a diode in line between the EGR Sol input from the ECM and the EGR Temp sw. Then when the ECM calls for EGR by energizing the EGR Sol that signal will immediately pull the EGR Temp sw line low, as though the sw had closed.
Thread Starter
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
Rock Auto has two brands ($67 & $74)
That is exactly how my '88 worked too. I would only get the light when on the highway cruising for 10 or 15 minutes. I suspect that is one of the few times the conditions that 65Z01 stated are met for the conditions to set the light and code.
That is exactly how my '88 worked too. I would only get the light when on the highway cruising for 10 or 15 minutes. I suspect that is one of the few times the conditions that 65Z01 stated are met for the conditions to set the light and code.
Thread Starter
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
What are the negative effects of running this code ? I'm wanting to avoid this particular repair at the moment. A chance for me to learn exactly what is going on here. I do know its all about emissions but what exactly ?