1990 GMC 5.7 Error Code 32

[babybeef]

MY GM Code reader says I have an error code 32 on my 1990 GMC 5.7 EFI.

 

The book says it could be (1) BARO sensor circuit failure or (2) EGR valve diagonistic switch closed during engine start up or open when EGR flow requested by ECM or (3) Electronic vacuum regulator valve EVRV error.

 

The service enging light comes on after about 20 minutes of running and resets itself each time I shut off and restart the engine. It will come on again after about 20 minutes of running. No degraded enging performance is noted when the light is on.

 

I have no Idea what a BARO sensor circuit is or an EVRV error is.

 

I hope it is just the EGR!!!!!!!!! Any Ideas

[defyrfytr]

MY GM Code reader says I have an error code 32 on my 1990 GMC 5.7 EFI.

 

The book says it could be (1) BARO sensor circuit failure or (2) EGR valve diagonistic switch closed during engine start up or open when EGR flow requested by ECM or (3) Electronic vacuum regulator valve EVRV error.

 

The service enging light comes on after about 20 minutes of running and resets itself each time I shut off and restart the engine. It will come on again after about 20 minutes of running. No degraded enging performance is noted when the light is on.

 

I have no Idea what a BARO sensor circuit is or an EVRV error is.

 

I hope it is just the EGR!!!!!!!!!  Any Ideas

 

<{POST_SNAPBACK}>

 

 

I checked my "Haynes Repair Manual", and the 32 code is an EGR failure.

 

"Check the vacuum sourceand all vacuum lines. Check the system electrical connectors at the PCM and EGR valve. Replace EGR valve or PCM as necessary."

 

Good luck....

 

Doug

[ChevyTech007]

I do not think you have a baro sensor problem. Do not waste your money on one. The easiest way to diag is to get the engine to operation temp, then feel under the egr valve where the diaphragm is and see if it raises when you raise the throttle fast. If it does not you have a vacuum problem. Possible valve or the vacuum to the valve. These are common to have the ports in the intake clogged with carbon, "and I mean clogged". Check if your valve raises on a sharp throttle increase (at operating temp) and post back.

[babybeef]

I checked the vacuum and it was good on both sides of the solenoid at operating temp. The EGR valve also seemed to open with rapid accelerator movement. However, I put on a new EGR valve anyway and the "Service Engine Light" (so far) has not come back on.

 

The old EGR valve did have a bit of carbon build up, but it was not completely clogged.

 

I did notice that the vacuum on the EGR side of the solenoid did not seem as strong as the Carb. side. However, I did not use a vaccum gage on to see if it was weaker. If the vacuum should be the same on both sides, I may need a new solenoid if it is not opening fully

 

I just hope the new EGR valve solves the problem. Thanks for all the help!!!!!!