1994 GMC Sonoma Engine running rough

  • 1994 GMC SONOMA
  • 4 CYL
  • 2WD
  • 233,500 MILES
My 1994 Somoma just started running rough. I performed a tune up with plugs and wires in May. The check engine light came on with a code 32.

What I replaced:

O2 sensor
Map sensor
EGR valve
EGR solenoid
Clean throttle body, did not remove fuel rail.
(EGR vent was completely clogged with carbon)

Eventhough I did this work, the truck is still running rough under load. At this point, there is no check engine light.

I'm out of options. Can you help?

How about the IAC or fuel presure sensor or Differential presure sensor?

Do you
have the same problem?
Monday, August 25th, 2008 AT 4:07 PM

1 Reply

Check the IACV

Disconnect the air intake ductwork from the throttle body.

Start the engine, then increase and hold the idle speed to 1,000 to 1,500 rpm.

Spray the throttle cleaner or engine cleaner into the throat of the throttle body, aiming for the idle air bypass port (usually located on the side or top of the throttle body opening). Give this area a good dose of cleaner (about 10 second's worth).

Turn the engine off to allow the cleaner to soak into the IAC passageway.

Wait about three minutes.

Restart the engine, rev and hold at 1,000 to 1,500 rpm, and repeat the cleaning process again.

Turn the engine off again, and reattach the air intake ductwork to the throttle body.

Start the engine and rev and hold to 1,500 to 2,000 rpm until no white smoke is coming out of the exhaust pipe.

If this fails to make any difference, you can remove the IAC valve from the throttle body and spray cleaner directly on the tip of the valve and/or into the ports in the throttle body. Let the cleaner soak awhile, repeat as needed, then reinstall the IAC valve, start the engine and run it at 1,500 to 2,000 rpm as before until no white smoke is seen in the exahust.

If the idle speed still surges after this, the IAC valve is defective and needs to be replaced.
Was this
Monday, August 25th, 2008 AT 5:01 PM

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