2002 Sensor Problems?

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March 24th, 2013, 8:36 PM

#11

mjshort

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I found the problem. I created a separate thread in this forum. My problem was the MAF sensor. I found this on another forum:
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GM informational document (#PI01385A):
4T40E , 4T45E , 4T65E Surge Slip Condition Under Load in 2nd, 3rd , and or 4th - kw 3.1 automatic body chuggle fourth hesitation hot LG8 miss second shift third valve #PI01385A - (Mar 25, 2004)
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
The 4T40E/4T45E/4T65E automatic transmission may experience a slip surge condition in second, third and or fourth gears while under load, such as driving up a long hill or mountain. The conditions either separate or working in combination seem to cause the 'Engine Load %' to drop to a value which the PCM commands a lower line pressure (increase in PCS amperage).
'Normal' degradation of MAF over time aggravated by induction of foreign material (fine dust, oil from non-OEM air induction systems; secondly, build up of carbon deposits in combustion chamber/intake valves over time; thirdly, outside ambient temperatures above 95 degrees F(35 degrees C) seem to aggravate the condition.
Recommendation/Instructions:
The MAF should be swapped from a known good unit or replaced and the vehicle evaluated
Clean the top half of engine to remove carbon deposits.