Question about 1994 GMC Sonoma

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1994 Sonoma just threw a code 32 EGR Valve do you have a diagram of the motor or can you tell me where it is located?

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Your EGR valve is located behind your throttle body and injectors, and it is attached to the intake manifold. It has two bolts on opposite sides of the valve and a vacuum line running out of it. Disconnect the vacuum line, remove the two bolts, and pull off the EGR valve. The EGR's on these trucks tend to get clogged up with carbon and stick. Take some carb and choke cleaner, and a small pick or very small flat head screw driver and break up the carbon inside of the valve. Be careful not to puncture the rubber diaphragm or you EGR will be no good after you get done cleaning it. Once you get all of the carbon deposits out of the EGR, assuming you buy a new gasket for it, put the gasket between the valve and intake manifold, tighten screws, and plug the vacuum line back in. This should solve your problem!

Posted on Jan 20, 2009

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Fig. 11: Unfasten the EGR valve retaining bolts...


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Fig. 12: ...then remove the EGR valve from the vehicle


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You should have your battery checked, it may be getting old and doesn;t have as much cold cranking power, I don;t think code 32 has anything to do with the slow cranking when cold.


Trouble Code 32 indicates that the Exhaust Gas Recirculation (EGR) valve diaphragm is not where the ECM expects it to be. The ECM controls the diaphragm with a Pulse-Width Modulated (PWM) waveform. The EGR has a vacuum bleed solenoid that adjusts the vacuum applied to the EGR valve based on this pulse width. If there is sufficient vacuum at the EGR valve, a switch closes to send a signal back to the ECM. The absence of this signal is the bases for code 32.
The conditions for setting this code are:
  • no vacuum to EGR (switch open), and
  • Code 33 or 34 (MAF error) is not present, and
  • engine running and LV8 is less than 100, and
  • coolant temperature is > 118 deg F (48 deg C), and
  • the EGR solenoid duty cycle is < 65%, and
  • the above conditions are met for more than 25 seconds


Typical causes for this code include:
1) Faulty EGR valve-to-ECM connection
2) Plugged EGR passages and/or sticking EGR valve
3) Defective EGR valve
4) Defective ECM

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