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Prev Professional Automotive Repair Technical Discussions for September 17, 2012
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Custom 3.8L Surge VIN: 1G4HP54K3Y
Surge when cruising, starts around 55 MPH gets worse when accelerating and continues until I let off the throttle. Seems to be worse when under load, going uphill. Fuel pressure stays steady about 50 psi when problem occurs. I found a bulletin with this proble...
1991 Chevrolet Corsica LT 3.1L No Start, Cuts out, Stall VIN: 1G1LT53T9M
Hi all, need some help here. As you can see from the list, quite a few things have been tried to no avail. This car will run fine until it warms up. Once hot, it may idle for quite some time, maybe smooth, maybe not. Or it may die right away. It will usually s...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start, Stall, MIL Lamp on VIN: 1G1YY23P7P
The customer brought in his corvette with a stall concern. When the vehicle is driven for a small amount of time it stalls and won't restart until it is cooled down. Initially I suspected crank sensor but came to find out it wasn't until 1996 that a crank sens... Trouble codes: 15 (ect sensor circuit low temp.)
1996 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W6T
Customer brought in this truck for a misfire p0303,on inspection the fuel pressure was only 50 psi, the spec's on it was 56 to 62 psi. so replaced fuel pump,Truck ran better but still had a intermitin misfire on #3, and after watching the misfire counter other... Trouble codes: P0303 (Cyl 3 missfire)
2003 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH52K13
repeat P0420 code.replaced conv 3x. no coolant loss,uses 1 qt oil per service, replaced o2 both,conv temp 550 frt/650+ rear, hot rear O2 600-640mv fairly flatline. calc load max of 87%. when code stores(freeze frame)closed loop,LTFT has been 126 and 129 not ri... Trouble codes: P0420 (cat efficiency bank 1)
2003 Chevrolet Impala LS 3.8L cooling fans VIN: 2G1WH52K83
Cooling fans will not come on by themselves. If you command the fans with the tech2 they will work on high and on low. We replaced all the relays, temp sensor and computer. Still have the same problem.
2004 Chevrolet Tahoe LS 5.3L transfer case VIN: 1GNEK13Z54
Got a strange one here. very intermittantly customer will start vehicle and transfer case is in low range. light is indicating low however, when the vehicle was parked it was in 2 high. we got lucky and confirmed this and it is physically in 4 low.It is not "s...
2009 Chevrolet Silverado 2500 HD WT 6.0L Radio VIN: 1GCHK44K49
Now that I have replaced the radio with used unit I cannot get it unlocked. The display indicated LOCK. I have tried the GM procedure pushing the preset 2+3 together and also 1+4 then you suppose to push AM-FM which this one does not have. I have cleared all t...
1999 GMC K1500 Sierra SLE 5.7L master cyl VIN: 1GTEK19RXX
came in with peddle dropping to floor , installed a new master cyl from napa , bench bleed master and system . peddle feels great with engine off, firm and hold good but with the engine running creeps to the floor. bleed everything even the abs unit. I can't b...
2006 GMC Sierra 2500 HD SLT 6.0L Engine VIN: 1GTHK29U66
Ok, heres a 2006 GMC 2500 HD, 6.0 gas 4l80E trans. It has a ticking noise from the engine area. I pulled the flexplate and checked for cracks,per TSB 210-10-27, none found, checked the balancer and bolt for damage or looseness after talking to tech line, found...
2006 Hummer H3 3.5L Battery Drain VIN: 5GTDN13646
Came in for battery drain. No codes but scan data for the bcm doesnt go to sleep after key is removed. Windows still operate with key out and door open and all scan data is present for bcm at all times. Any input on this one would be greatly appreciated!
2008 Pontiac Grand Prix 3.8L Stall, no starter VIN: 2G2WP55238
this Pontiac will just shut off at random, idling in shop or driving down highway.than starter will not function, info center has STARTING DISABLED DUE TO ELECTRONIC THROTTLE CONTROL.has no codes in pcm and lists no failure in throttle system.i replaced the ig...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CXL 3.4L ac compressor VIN: 3G5DB03E02
When reviewing alldatas compilation of GM service information it seemed that the signal for the ac request wetn directly from the climate control module to the pcm. I was able to access information directly from GM and found that it goes through the bcm. I kne...
1988 Chevrolet R30 Silverado 5.7L Hesitation, Misfire VIN: 1GBHR34K8J
Thanks to all for the help. It needed a pick-up coil and ignition wires. I could not find a secondary ignition loss but did find high resistance in the wires. Thanks again for the help. Curt
2003 Chevrolet Tracker 2.0L Readiness VIN: 2CNBJ13C73
Thanks to all that replied. Good suggestions as I was hoping for. This was a situation where the customer was not quite truthful which hindered diagnostics. He was putting parts on himself based on codes that came up and advice from a parts house. I guess he f...
1977 GMC C15 Sierra Classic 5.7L Cuts out, backfire/exaust VIN: TCL447Z515
thanx for all the imput... tried jetting down the edelbrock; no luck,replaced the edlebrock with a quadra-toilet, still had the same problem: WTF!!! (right)? double checked the vacume source for the diverter valve. had manifold vac the first time i checked it,...
2003 GMC Yukon Denali 6.0L instrument cluster VIN: 1GKEK63U53
Problem seems to have wiggled itself out. I checked all connectors at instrument cluster, neutral switch on gearbox, regrounded abs module and problem went away after driving the vehicle. Thanks for all the responses!
2010 GMC Sierra 1500 SLT 5.3L MIL Lamp on VIN: 3GTRKWE32A
Thanks for all the replies, we have determined to send this vehicle to the dealer to get the ecm flashed & let them set the alcohol trims. Until next time God Bless David Lee Trouble codes: P0172 (Rich Bank 1), P0175 (Rich Bank 2).
2004 Pontiac Grand Am SE1 3.4L Starting VIN: 1G2NF52E74
car is not here to look at, o2 sensor 1 value always around 440 even unpluged, fuel pressure holds steady at 60 while cranking, coverter was glowing when arrived and emediatly suspected bad by service manager (made no difference) rich condition, wish had more ...
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