Question about 2001 GMC Sonoma Extended Cab
The 2.2 does not use any type of MAF sensor so the engine doesn't really care about what is before the throttle body.
the Lean code is coming up because the O2 sensor is reading lean more than it is reading rich. This most commonly is caused by a vacuum leak.
another possibility is that the O2 is starting to bias lean. this could be confirmed with a scan tool and some carb spray. While monitoring O2 data spray some carb spray into the throttle body and see if the O2 switches to rich. If it doesn't it is bad.
another possibility is low fuel pressure.
Posted on Feb 18, 2012
Yes, the Intake may be leaking extra air from a bad seam gasket. The code means there is too much air and not enough fuel reaching 1 or both banks of the engine.
Sometimes unplugging a MAP sensor in the air bonnet will make this code or cause the engine to overcompensate. Clear the codes if you have done work and then test it again if the code reappears.
Sometimes you can spray a water mist on the seams and Vacuum lines to detect leaks while the engine is running. If the RPM changes or stalls you have found the leak.
Posted on Feb 18, 2012
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Posted on Jan 02, 2017
Check the magnetic clutch is engaged on front of a/c pump, have the motor running, a/c on and fan on high, if the centre hub is static the pump in not switched on, this can happen when the gas pressure gets low.
Posted on Aug 05, 2009
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