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Prev Professional Automotive Repair Technical Discussions for May 20, 2015
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Open Help Requests for GM
Help Request Answers
2003 Chevrolet Malibu 3.1L No Start, no pulse VIN: 1G1ND52JX3
At wits end.Pcm will not pulse injectors to ground.My scope skills are novice at best, mostly as a go-no go guage (is there a signal or not?).Have a 0-5v square wave from cam sensor at pcm,what appear to be good signals from both crank sensors.Am not versed in... Trouble codes: P1189 (oil pressure switch circuit)
2005 Chevrolet W3500 Tiltmaster W3S042 6.0L MIL Lamp on VIN: 4KBB4B1U55
I have this truck in that's giving me fits. We usually don't work on these but it's a friend of the bosses. What I'm looking for is the TAC CONTROL MODULE LOCATION, I got a special request from alldata that said it was on the firewall, but this is a tilt maste... Trouble codes: P0120, P0220, P1516, P2101, P2135
2008 Chevrolet Express 1500 4.3L Poor Idle Quality, Cuts out, Stall VIN: 1GCFG15X58
Hi This van came in with a reduced power light on and codes P1516 and P2101. It was running very bad(misfiring) especially at idle and if you would bring the RPM up to about 2300 RPM the misfires would go away, but the vehicle lacked power. So I pulled the dog... Trouble codes: P1516 (Throttle actuator performance), P2101 (Throttle actuator position performance), P2176 (TAC idle postion not learned)
2011 Chevrolet Express 1500 4.3L No Start VIN: 1GCSGAFX0B
This is a no crank no start. This vehicle is a theft job but had a breathalyzer system installed. We removed the breathalyzer system and reconnected and repaired all spliced wires. If purple power wire is powered up starter is engaged. Power probing stater rel... Trouble codes: P0460
1995 GMC Sonoma SLE 2.2L No Start VIN: 1GTCS1943S
This one has me stumpted. A good friend of mine ownes this. It started running bad so he figured it was time to do a tune up this is when he did the plugs and wires. Well it would not start. He checked for spark and it would come and go very eratic. This is wh...
2003 GMC Yukon XL 1500 SLE 5.3L evaporator VIN: 1GKFK16Z43
Customer says cools great but after 20-30 minutes the air flow decreases and gradually stops. Shut off or switch to vent (no compressor) for 5-10 minutes and works again. Rear air always works. I did have a issue with orifice install, line was tweaked and had ...
2001 Oldsmobile Intrigue GX 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52H31
Misfire on cylinder 1 when cold. Goes away when warmed up. Swapped coils, injector and spark plugs but misfire stays on cylinder 1. Vehicle gets hot when idling but is fine when driving. Cooling fans are working. Tested coolant for combustion gasses but passed... Trouble codes: P0300
2007 Saturn Aura XE 3.5L Cuts out VIN: 1G8ZS57N57
35-40 mph no acceleration when gas pedal is pushed sometimes does it sometimes not. I drove it a few times no problems, customer comes get it- on way home does it-NO CODES SET

Fixes & Summaries for GM
Fix/Summary Answers
2004 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E94
Thank you everyone for your great responses. I finally found the fix after much frustration. There is two big plug in connectors by the battery that are blue and have a pull down lever to disconnect the connector. In the big connector that hangs from the cross...
1993 GMC G3500 Magnavan 6.2L Motor VIN: 181177BLUE
Most everyone mentioned checking for higher than usual current draw due to poor connections or degraded wiring. These basics we already had checked. Also mentioned was the likely worn starter which after trying a new pair of batteries we considered most likely...
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