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Prev Professional Automotive Repair Technical Discussions for August 2, 2014
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 3G1JC1247T
Car runs fine in open-loop, it has great vacuum idles fine. Once in closed-loop the vacuum slowly drops from 18in/hg - 8in/hg and eventually stalls out. I see this happening on the scan tool and actual vacuum gauge. If I unplug the O2 sensor or tsp to force it... Trouble codes: P0171 (Bank 1 system lean)

Fixes & Summaries for GM
Fix/Summary Answers
2011 Chevrolet Silverado 1500 WT 4.3L evaporator VIN: 1GCNCPEX3B
The fix was to replace the faulty HVAC control module. Once that was done, the A/C compressor cycled normally when the evaporator temperature sensor reached about 35F. Oddly, the HVAC control module came pre-programmed, so I performed the module set-up thro...
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