Code 32 and now 33 too!
Thread Starter
Racer
Joined: Apr 2002
Posts: 287
Likes: 6
From: St Albert Alberta
Code 32 and now 33 too!
Hello - I've been messing about with a code 32 and decided to clean up the MAF and throttle body first to see if it improved anything. I had pulled the ECM fuse first to clear codes and now I get code 32 and code 33. What does the 33 mean I should do next?
Thanks everyone
Thanks everyone
Team Owner
Joined: Jan 2003
Posts: 20,292
Likes: 239
From: Summerland B.C. Canada
Thread Starter
Racer
Joined: Apr 2002
Posts: 287
Likes: 6
From: St Albert Alberta
Hello all,
Firstly thank you Agent 86 for the diagram as it allowed me to diagnose the code and correctly replace the EGR temp/diag sensor.
I no longer have any codes however I continue to have a ping problem. I have cleaned the throttle body, MAF and replaced gaskets on the TB and EGR valve as they were in bad shape. I figured perhaps outside air was getting in past the gaskets. The valve looks newer and compresses very well so I didn't replace it. I use premium fuel (91 octane) and have tried many different brands to no avail. My reading on the forums etc seems to indicate a lack of EGR gas causing the pinging. The engine was rebuilt prior to me buying the car with less than 10k miles on it and other than the ping runs very well.
Could the valve be bad or should I be addressing another area? Engine timing is at 6* with wire disconnected. I know this car should pull better than it does when its warm before the knock sensor does its work pulling back timing. Before she's at operating temperature its much stronger (obviously).
Thanks everyone
Firstly thank you Agent 86 for the diagram as it allowed me to diagnose the code and correctly replace the EGR temp/diag sensor.
I no longer have any codes however I continue to have a ping problem. I have cleaned the throttle body, MAF and replaced gaskets on the TB and EGR valve as they were in bad shape. I figured perhaps outside air was getting in past the gaskets. The valve looks newer and compresses very well so I didn't replace it. I use premium fuel (91 octane) and have tried many different brands to no avail. My reading on the forums etc seems to indicate a lack of EGR gas causing the pinging. The engine was rebuilt prior to me buying the car with less than 10k miles on it and other than the ping runs very well.
Could the valve be bad or should I be addressing another area? Engine timing is at 6* with wire disconnected. I know this car should pull better than it does when its warm before the knock sensor does its work pulling back timing. Before she's at operating temperature its much stronger (obviously).
Thanks everyone
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
ping
check the plastic vacuum tubing under the plenum. sounds like you aren't getting control vacuum due to those brittle plastic tubes either to or from the EGR control valve.
also make sure the egr control valve is plugged in
also make sure the egr control valve is plugged in
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Racer
Joined: Aug 2006
Posts: 276
Likes: 1
From: Brentwood CA
That link to the code 32 diagram is sweet.
I have a 1989 C4 auto with a code 32 right now.
Everything was fine - I simply unscrewed the wire going into the EGR pipe, replaced the heat sheild wrap, and put the wire back in.
Will this diagram, which mentions the year 1986, be ok to use on my 1989?
I have a 1989 C4 auto with a code 32 right now.
Everything was fine - I simply unscrewed the wire going into the EGR pipe, replaced the heat sheild wrap, and put the wire back in.
Will this diagram, which mentions the year 1986, be ok to use on my 1989?
Thread Starter
Racer
Joined: Apr 2002
Posts: 287
Likes: 6
From: St Albert Alberta
My vacuum lines are in very good condition actually - I thinking they may have been replaced. EGR is plugged in.
I'm pretty sure the 86 diagrams are the same for the 89.
On another note I've tried 94 octane and it improved a lot. However I would still like to have it run without ping on the 91 as it was designed to do, then do a timing advance to 8* like many others have had success with.
Advice is always welcome here.
Thanks everyone.
I'm pretty sure the 86 diagrams are the same for the 89.
On another note I've tried 94 octane and it improved a lot. However I would still like to have it run without ping on the 91 as it was designed to do, then do a timing advance to 8* like many others have had success with.
Advice is always welcome here.
Thanks everyone.
Racer
Joined: Aug 2006
Posts: 276
Likes: 1
From: Brentwood CA
I think I found my problem after looking at Eckler's picture of the EGR valve Temp Sensor - I unscrewed the wire from the hex fitting (it came out by hand, no tools) - but it looks as though I should have unscrewed the fitting from the pipe. fortunately it's only a 15 part at the dealer....
