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EGR help needed

Tom73

Well-known member
Joined
Aug 21, 2001
Messages
1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
I have been getting an intermedent "Service Engine Soon" light, so pulled the codes and had a history 32 code, EGR System Error.

I looked at the testing procedure in the manual and got totaly lost, may as well have been in Greek. Can anyone provide an easy way to test the EGR system? If the EGR should need to be replaced, what is involved since it is under the intake plenum?

Got to get this thing running right since it is going to be making a 20 hour trip next week from Austin TX to the Chicago area for the Bloomington show.

tom...
 
C

c4ever

Guest
Tom,
I would test the solonoid switch first. It's an easy diagnostic(I assume you have the GM service manual) and it's usually the culprit. They sell a quick connect replacement.
Keep us posted.
Carlo
 

Tom73

Well-known member
Joined
Aug 21, 2001
Messages
1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
Carlo,
Where in the world is that selonoid? Is it also under the plenum? How do you access it?

tom...
 
C

c4ever

Guest
There is a switch attached to the EGR. You should see a pair of wires coming off it(may be a single wire). It's a pain to get to. MAD or CC sell a replacement. If you have the service manual there is a test procedure for proper operation and a detail schematic. If you need the schematic shoot me an e-mail and I'll get it to you.
:w

9 times out of 10 this is the problem and it's an inexpensive fix. I know, I had the same problem. :(
 

Tom73

Well-known member
Joined
Aug 21, 2001
Messages
1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
I have the service manual and it does reference how to test the selonoid and so on but it appears that everything is located under the plenum. Cannot figure how to get to anything without removing the plenum. I cannot see anyway to get to it between the intake runners.

tom...
 
V

vrgsvette

Guest
egr solonoid should be bolted to the thermostat housing at the front of the motor
 

Tom73

Well-known member
Joined
Aug 21, 2001
Messages
1,427
Location
Round Rock, TX
Corvette
73 LS4 Coupe - 04 CE Conv
vrgsvette said:
egr solonoid should be bolted to the thermostat housing at the front of the motor

So that is what that thing is :D Wonder if I may have just knocked something loose as just replace the water pump and t-stat. Hummmmm.....

tom...
 
C

c4ever

Guest
Sorry Tom, should had advised you that I'm referencing an 85 but it looks like you may have that booger nailed. All's well that ends well:cool

Hope that's the problem cause code 32 is a PITA:r
 

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