32 Check Engine code, EGR switch
Thread Starter
Instructor
Joined: Mar 2004
Posts: 138
Likes: 0
From: Naples FL
32 Check Engine code, EGR switch
The c4vettes.com site indicates that with this error code, the EGR "switch" should be replaced first. Where is it on my 88 coupe?????? I see an EGR valve, EGR solenoid, no EGR switch.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
Re: 32 Check Engine code, EGR switch (Duf)
The EGR feed tube is where the switch is mounted on back of the manifold on the passenger side.
The switch is a black wire with a white ceramic looking housing.See if thats broken up or wiggled loose.
The switch is a black wire with a white ceramic looking housing.See if thats broken up or wiggled loose.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: 32 Check Engine code, EGR switch (Duf)
Yea the switch is right on top of the EGR tube but the damn connector is back down behind the left side of the dist base!!!
Anyway, you can use the diagnostic method on my site to isolate the casuse of the code 32. BTW, does it throw the code at start up or while cruzin?
The voltage on the switch should go to zero when the EGR Valve is open and hot exhaust gas if flowing through the EGR tube.
Anyway, you can use the diagnostic method on my site to isolate the casuse of the code 32. BTW, does it throw the code at start up or while cruzin?
The voltage on the switch should go to zero when the EGR Valve is open and hot exhaust gas if flowing through the EGR tube.
Thread Starter
Instructor
Joined: Mar 2004
Posts: 138
Likes: 0
From: Naples FL
Re: 32 Check Engine code, EGR switch (65Z01)
Sometimes the code will appear on startup and stay there, sometimes it won't show at all, sometimes it will come on while driving. Great answer huh? :) Now that I know where it is I will check it out. There is something definitely wrong with my EGR system, I have issues with rich gas smell periodically coming from up front.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Re: 32 Check Engine code, EGR switch (Duf)
If you end up replacing the EGR switch, here is a suggestion to consider. Leave the old pig tail connected and cut the wire near the old EGR switch. Cut the pig tail connector off the new one, splice, solder, and use some heat shrink to complete the connection. Unless you have really small hands, it's difficult to get in there by the distributor to disconnect and re-connect the new pig tail connector.
Le Mans Master
Joined: May 2003
Posts: 5,203
Likes: 0
From: Las Vegas Nevada
Re: 32 Check Engine code, EGR switch (Duf)
I neve get a 32 in cool weather. Now that its gettin hot I will get the dreaded code 32 after driving on the freeway in the heat for about 20 minutes.
I ignore it. If I shut the car off, it resets and will not come on again until I get to the freeway.
PITA but I live with it. :seeya
I ignore it. If I shut the car off, it resets and will not come on again until I get to the freeway.
PITA but I live with it. :seeya
Thread Starter
Instructor
Joined: Mar 2004
Posts: 138
Likes: 0
From: Naples FL
Re: 32 Check Engine code, EGR switch (Southern Comfort)
Well today I got the Check Engine immediately. It stayed on until the car got good and warm then it went away. I plan on swapping the switch first.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: 32 Check Engine code, EGR switch (Duf)
Both the switch and the valve are relatively expensive so I suggest you use the test scheme to try and isolate the problem.
If the switch is shorted closed (you might check it's wire for a bare spot) you will always get the code at start up; if it is locked open you will always get the code after cruzin for a few minutes if the engine is warm enough (i.e. > 176deg F). Check for a + voltage on the switch at start up; if zero the switch is shorted or stuck closed.
Since it also comes on after driving, it sounds to me like the valve is sticking, sometimes open and sometimes closed.
If the switch is shorted closed (you might check it's wire for a bare spot) you will always get the code at start up; if it is locked open you will always get the code after cruzin for a few minutes if the engine is warm enough (i.e. > 176deg F). Check for a + voltage on the switch at start up; if zero the switch is shorted or stuck closed.
Since it also comes on after driving, it sounds to me like the valve is sticking, sometimes open and sometimes closed.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: Dec 2003
Posts: 1,493
Likes: 94
From: Westfield MA
Re: 32 Check Engine code, EGR switch (65Z01)
Go to 65ZO1's web site, he lays it out for you on how to test it. Mine ended up being the switch which was about $8 and it is a pain to get to the connector, but it is possible without removing the distributor. If the switch does not close after 4 minutes of EGR comand and the coolant temperature being over 176, the light comes on. Mine never came on till i replaced the t-stat, then it came on 4 minutes down the highway. But seriously, 65ZO1's website lays it all out for you.
