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Prev Professional Automotive Repair Technical Discussions for March 18, 2010
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Open Help Requests for GM
Help Request Answers
1988 Chevrolet Corvette 5.7L Mechanical VIN: 1G26789012
i just had a performance cam put in the car it had no problems befor but now it smokes all the time burns oil it is realy bad it is more when idling then anything else not sure what it could be i also changed valve springs
1996 Chevrolet S10 2.2L engine VIN: 1GCCS1442T
this truck surges at idle real bad ive done a complte tune up ,fuel filter,air filter and checked fuel pressure which was at 45 psi it runs great on the road ive checked 4 vacum leaks none found when at a stop light it surges bad enough that its hard to take o...
1998 Chevrolet K1500 Silverado 5.7L Transfer cas VIN: 2GCEK19R4W
Thanks in advance. I changed the torque converter in this transmission and sent it down the road, two days later it came back with a complaint that it will not go into four wheel drive. The system has a three button switch and all three buttons are lite. If I ...
2002 Chevrolet Prizm 1.8L No Start VIN: 1Y1SK52812
Thanks for looking . Replaced rings for oil fouling #4 . Vehicle ran when brought in , now will not start . Coils # 1 & 3 will fire , #'s 2 & 4 will not . Have read that the PCM will fail safe and disable injectors if coil failure is detected . I get one flash...
2004 Chevrolet Trailblazer LS 4.2L Mechanical VIN: 1GNDT13S74
04 4.2L all but 3 HEAD bolts snapped upon removal. any tricks to removing them, is it a common problem on these motors? i have welded out many exhaust manifolds bolts before, but these head bolts are very deep in the block, at least 1\2 inch.
2005 Chevrolet Classic 2.2L timing chains VIN: 1G1ND52F65
car came in with a lot of noise up top. found the engine oil filter had caved in. there were pieces of it stuck in the head gasket orifice which starved the intake lifters and cam. the head and cam got replaced. cleared the oil passages to the head. changed oi...
2005 Chevrolet Cobalt 2.2L unknown VIN: 1G1AK12F65
Good afternoon to all and thanks in advance for your help. I have this 05 cobolt customer is complaining of steering wheel very hard to turn/no power assist.She came in 3 weeks ago w/ this complaint We were unable to duplicate any issues at that time. Customer...
2005 Chevrolet Cobalt LT 2.2L overheating VIN: 1G1AK52F35
i have a 2005 cobalt has overheated and has water in the oil. removed cylinder head and gasket was fine. pressure tested the head and it too is ok...what am i missing?
2005 Chevrolet Corvette 6.0L Starting system VIN: 24U0551136
Car will not start when you press the "Start" button on dash. All lights on dash and headlights, etc go out for approx 20 - 30 secs. then dash lights will light again and you cannot turn system off. Always on ACC or ON position. The Service Engine Soon light i...
1996 GMC G3500 Vandura 5.7L Poor Idle Quality, Hesitation, Stall VIN: 1GDHG31K4T
I have been fighting this for awhile now. Vehicle came in that would stall, found that it stalls usually when cold and put in gear. It will stall occasionally when idling. No vacuum leaks have been found. Fuel trims when in closed loop long term usually maxs o...
2005 GMC W3500 Forward W3S042 6.0L Excessive Emissions, Hesitation, Misfire VIN: 4KLB4B1U85
1st this is an npr with all gm comp. 6.0 gas 4l80e trany, anyway truck will p0300 misfire and p0171. 135 and 7 only misfire. my book says app 1 should be .4-.9 volts at idle and app2 4.1-4.5 volts at idle. i have .5 on app 1 and 0 on app2. a few days ago i had...
2006 GMC Yukon SL 5.3L Transfer Case VIN: 1GKFK16Z16
When placed in 2HI the vehicle will "POP OUT" of gear in the transfer case. After you stop, put it the trans in Neutral and push any of the transfer case buttons it will re-engage, put it back in drive and go. What I have noticed is that it seems to only do it...
2004 Oldsmobile Alero GL 2.2L No Start
I have a 2004 Alero with the 2.2l ecotec that will not start. It has good fuel pressure and spark, but no injector pulse. I have scanned it and it is showing a RPM signal, the CKP counter does increment and the CMP counter(calculated since this is a compressio...
1997 Pontiac Grand Prix SE 3.8L car dies VIN: 1G2WJ52K3V
the problem with the car is while driving down the road it will just shut off then u can put in nutreul or park and it will start right back up no problem just wondering where else to go from here there are no codes it runs fine no misses or nothing just shuts...
2008 Pontiac Solstice 2.4L ABS &ecs turned off VIN: 1G2MC35B68
When codes returned after wiring repair, I checked codes tsb's and inspected car areas of interest. No more wiring problems found. Codes are B0081 Passenger presence sys 1 internal electronic malf. B0083 Front end sence 1 shorted to battery(repaired ar hoodhin...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Eldorado ESC 4.6L No Start VIN: 1G6KD54Y3W
This is fixed, it was a bad wire in the engine compartment behind the waterpump. Thanks to all...
2004 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GBHC24U24
i put about 25 miles on it and everything was fine thanks for ideas but after checking eveything and nothing seemed fine i just decided to drive it must of had something stuck in a valve Trouble codes: P0300.
2004 Chevrolet Classic 2.2L T.Chain tensioner VIN: 1G1ND52F24
Thanks for all your help. The chain was worn. With old timing components the new tensioner was at full extension and there was still 1/4 inch of chain deflection. With new components tensioner extended maybe 25% and had no chain deflection. I replaced the bala...
1999 GMC Yukon Denali 5.7L No Start VIN: 1GKEK13R1X
I think my gauge has a problem. I replaced the pump, fuel pressure regulator and cleaned the fuel injectors. I did about 4 cold starts, even had one day with frost on the window. Let it sit idling for about 1/2 hour and the gauge said 62psi. Go figure. Th...
2001 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Misfire, no power VIN: 1GKFK16T31
this was a new thing for me i put an 02 sensor in bank 2 and it fixed this is the first time i have seen an 02 sensor cause an issue like that the sensor even checked perfect but after disconecting it and letting it run without it it ran great never wou... Trouble codes: P0300.
2002 GMC Sierra 1500 5.3L ipc VIN: 2GTEK19TOY
Thanks for everyones replies. Got the truck back from the customer and drove several hours and could't make it act up again, I ran redundant grounds to the IPC to see if this helps, returned the truck to the customer and he has not had it act up yet.
2005 GMC Yukon XL 1500 SLT 5.3L Stall, MIL Lamp on VIN: 3GKFK16Z05
After more inspection found that there was an intermitant ground issue for pcm. Found that when vehicle was acting up, if I took pcm and touched it to metal it would start running properly and all weird problems would disappear. Found that ground G103 was brok... Trouble codes: U0107, C0237.
2005 GMC Envoy SLE 4.2L transfer case VIN: 1GKET16S05
well i lost on this truck but it is fixed. after repairing the front differential again, i swapped propshaft speed sensors and in a 12 mile test drive i only had one occurrence of transfer case engagement when not needed. replaced both speed sensors and drove ...
2001 Pontiac Aztek 3.4L High Speed Cooling Fan VIN: 3G7DA03E91
I tricked the ECM into thinking the engine was hot, cooling fans run just like they should, I swapped back to original ECM, tricked ECM and cooling fans do not run. So the original ECM was defective, but my scan tool for some reason will not command the high s...
2002 Saturn Vue 3.0L Misfire, MIL Lamp on VIN: 5GZCZ63BX2
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