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Prev Professional Automotive Repair Technical Discussions for August 12, 2009
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Open Help Requests for GM
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1954 Buick Super 322CID converter VIN: A401765200
ok guys i need some info on this one so i don't pull this back out for no reason,origally pulled and rebuilt because it was not installed corectly(wiped out front pump because converter not clocked right)when took apart also found wrong pump gasket,this is a d...
1995 Buick Regal 3.8L Surge VIN: 2G4WB52LXS
Our concern on this car is the surging under load but we have tested everything out that we could think of, but our main concern switched from the surge to getting the history codes to clear. The vehicle had twelve codes in the history we thought this seemed l... Trouble codes: P0113, P0118, P0123, P0140, P0341, P0502
2004 Cadillac Escalade 6.0L Hesitation, Stall VIN: 1GYEK63N54
This code (P2135) is very intermittent. I have followed diagnostic on Alldata concerning loose wiring crimp at throttle body connector. I cannot find any loose conections nor can I duplicate the problem. I have done voltage drops on G103 & G104. Has anyone com... Trouble codes: P2135 (TPS 2 Sensor Disagrees With TPS 1 Snsor)
1996 Chevrolet Caprice Classic 5.7L Hesitation, Surge VIN: 1G1BL52P4T
Car came in after sitting for more than a year with a hard miss.Someone else had been into it and crossed cylinder number 2 and number 6 plug wires.Car still missed. Dist vent house was carbon tracking out of cap. Cap and rotor replaced.Miss was gone car still... Trouble codes: P0335, P0336
1998 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 43WM116823
Greetings fellow tech Thank you for your time on reading this message. I have this 98 chevy cavalier with a starting condition during cold start and after warm up. The vehicle is hard to start during the cold crank. After the engine warms up it is still a bit ...
1998 Chevrolet K3500 Cheyenne 7.4L engine VIN: 1GCHK33J0W
I have a bit of a mystery. Customer returned from a trip out of town over weekend. Said the truck ran great all of the way. On first start up Monday, it ran horrible. MIL was flashing. She was able to drive to our shop. I did a quick crank test and could tell ...
2000 Chevrolet Prizm 1.8L pressures VIN: 1Y1SK5289Y
This little prizm came in with an a/c leak. Located the leak to be the front seal of the compressor. MAJOR leak. Replaced the compressor, orifice, dryer, and belt. vacuum for 60 minutes and charged with 1.65lbs 134a. Added 3 oz of oil to compressor and 2oz to ...
2007 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S97
Has anyone seen this code before? Mitchell's discription isn't very clear and there isn't a good test procedure. I have checked for PCM updates related to this code and there aren't any. Any help would be appriciated. Trouble codes: P1400 (Cold start emission reduction system)
2007 Chevrolet Cobalt LS 2.2L vavletrain VIN: 1G1AL55F86
Hey fellow techs, seems like once a little goes wrong a lot follows it. I replaced the headgasket on this 2.2L cobalt. It was for and older mechanic and he was trying to save as much as possible. So when i was done he said he would change the oil, which i didn...
1997 GMC Sonoma SL 4.3L Engine VIN: 1GTCT14W4V
Came in on a tow truck with a blown slave cylinder. Did a full clutch job. Afterwards, it was very difficult to start the engine. Found the distributor was 2 teeth off and could tell someone has had the intake off before. Retimmed distributor and got the engin...
2000 GMC Sonoma SL 4.3L No Start VIN: 1GTCS19WXY
customer complaint - vehicle is very hard to start in am but ok after it does start. for several days it started ok for me. after sitting over weekend it failed to start. spark is good. fuel pressure ok. and getting pulse at injectors. vehicle would not fire e... Trouble codes: P0300
2003 GMC Yukon SLE 5.3L Rear AC temp door and mode door VIN: 1GKEK13Z53
I wasn't sure if this would be elect or AC, so I put it here. the aux ac wont change mode or temp. it always blows cold out the face vents. the very rear control head is missing. it says that it communicates over the class2 data buss. the front aux control hea...
1999 Oldsmobile Intrigue GL 3.5L Stall VIN: 1G3WS52H2X
this car has an intermittant stall concern. mostly noticable when first started cold, but can happen anytime. sometimes may start and stall 3-5 times right away, sometimes may stall only once and then run fine. checked fuel pressure=ok, had fuel pressure gage ... Trouble codes: N0NE
1994 Pontiac Firebird 3.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, Can't read computer VIN: 2G2FS22S3R
The car randomly shudders, stauls, high idles, cuts out, won't start - "warm or cold", terrible fuel mileage, and won't idle. These are all the symptoms and they are all occuring randomly. Trouble codes: 012 (Code reader wont connect to computer at all.), 000 (Snap On couldnt make any connection)
2000 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB5249Y
This car came in with a MIL lamp on, and three current codes indicating faults pertaining to both O2 sensors. I checked under the "codes set since last cleared" and came up with a total of six O2 sensor codes. I monitored the O2 voltages with my Modis and Key ... Trouble codes: P0141 (O2 Heater fault)
2000 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB5248Y
Car came in for dead battery, had to jump start after sitting, gauges in dash work/dont work and warning lights come on. Jump start car, theft light, service light, brake/abs light, check gauges light, speedo, tach, coolant temp, fuel gauge not working and err... Trouble codes: U1016, U1000, U1000, U1040, U1064, U1301

Fixes & Summaries for GM
Fix/Summary Answers
1980 Buick Skylark 2.8L Misfire, MIL Lamp on VIN: 4B697AW136
thanks to all for the quick responce. well the misfire was fixed by replacing the ignition wires, and the check engine light by replacing the coolant temp. sensor with new connector. now the vehicle passed the smog inspection. again thanks for the help Trouble codes: 15.
1995 Buick Riviera 3.8L No Start VIN: 1G4GD2215S
Thanks for all the help. 29 replies, outstanding! The short answer to this problem is ignition switch, not enough current flow to the ignition module. The long answer is this. Many of you pointed out the problems they have had with conections, and especial...
1999 Cadillac DeVille 4.6L engine VIN: 1G6KE54YOX
thanks to juan-kevin- don and dave the owner has decided to do the time-sert installation versus another engine. you're replies convinced him to either find an engine that was the proper year or repair the one he has. i learned more about the 4.6 than i really...
2000 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR54R1Y
I had to use tech 2 remote programming to program the ecm thanks for the tips Trouble codes: P1280.
1996 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R1T
Turns out that the fuse for the data link connecter was blown. I use the modis scanner which uses its own power, the smog machine uses the voltage from the data link connecter. Talk about going back to basics. Thanks everybody for your help. Trouble codes: P0420 (cat efficiency low bank 1).
1997 Chevrolet C1500 Suburban 5.7L pressures VIN: 1GKFK16R1V
There are two people that hit the nail on the head. When the new lines to the condensor were installed, They were mistakenly installed backwards. I got into the shop this morning and found the problem. Evacuated and reinstalled (correctly) recharged, Man thats...
2001 Chevrolet Venture LS 3.4L Hesitation VIN: 1GNDXO3E21
hey folks thanks for all the tips swapped out every part you can think of still had hesitation as far as i know havent seen customer for 2 weeks now i'll be back.
2002 Chevrolet Camaro Z28 5.7L Misfire VIN: 2G1FP32G02
Tecks! let this be a lesson learned for all. (it is was for me) Improper plugs were the culpret! There was a Denso plugs installed 500 miles ago and low and behold this is when the problems have started. Damn, well back to bascis... Thank you ALL for the tips ... Trouble codes: P0300.
2002 Chevrolet Tracker ZR2 2.5L alternator VIN: 2CNBJ73412
Dave check for a weak or no ground to the alternator other than that then it could be another bad "new" part. I have had repeats. Dave dont be concerned with amperage,voltage cooks batteries should between 13.2-14.5vdc if within this spec its ok Another senero...
2000 GMC Jimmy Diamond Edition 4.3L unknown VIN: 1GKDT13W3Y
Thank you all who posted suggestions. I am grateful for the response. Most replies focused on the transmission being the cause. Lane [...] are very knowledgeable technicians with good experience on ...
2004 GMC Sierra 3500 SLE 6.6L oil pressure VIN: 1GTJK33224
OK, a bunch of people told me that I didn't let the engine crank long enough or run long enough to determine whether or not I had sufficient oil pressure. So I put the whole truck back together, put the turbo back on, put the oil pan back on, filled it with oi...
1991 Oldsmobile Cutlass Ciera 3.3L No Start VIN: 2G3AJ51N5M
found shorted injector and second pcm way to go!!! Raymond from wisconsin steve from california william from florida edward from illinois
2003 Oldsmobile Alero 2.2L Horn VIN: 1G3NL52F77
There is no repair or part availble for this problem.I am buying a used air bag system to repair the horn.Thanks for the replies
2006 Other GM WORKHORSE 6.0L MIL Lamp on VIN: 5B4JPD2UX6
thanks who reply. after spent hours tracing all the ckts.only thing is left is PCM. called work horse dealer to have PCM done under warranty and we got no where with them. customer ended up paying for the PCM. replace and program PCM. no issues. Trouble codes: P0452 (evap pressure sensor signal low/ short), P0463 (fuel level sensor circuit open / high), P0522 (engine oil pressure sensor circuit signal low), P0711 (trans temp sensor circuitout of range), P0200 (injector circuit problem).
1997 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NE52T5V
after talking with a tech from identifix i found that if i tried to bring the idle up on the car there was a spot that the idle would jump and it would not rise or lower without jumping past that spot. this is a symptom of timing being a little off, which caus... Trouble codes: P1133 (02 sensor circuit insufficent activity), P0300.
2004 Saturn L300-2 3.0L rear tires VIN: 1G8JL54R24
Hello again and thanks to those who gave informative replies, and Erik from New Jersey, who pointed me in the right direction by giving me a part number for a adjustable lower rear control arm to address the issue I was having, the ride height was fine as were...
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