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Prev Professional Automotive Repair Technical Discussions for July 29, 2009
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 2.5L Stall VIN: 1G4NV54U6M
HELP GM TECHS!!This one is eating me alive. Runs great and accellerates all day long. When coming to a stop it stalls. When it first came in we verified the complaint several times. When we got the chance to hook up the pressure guage it had 11psi and then ama...
2003 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54K73
This car came in yesterday. Sometimes it runs great and then the door chimes go off and the mil light comes on with the traction contorl light as well. When these lights are on the HVAC control head blacks out and the A/C is inoperable. When I first checked fo... Trouble codes: P1571 (TCS PWM circuit no frequency/ signal), U1040 (Lost communication EBCM/EBTCM), P1689 (TCS deliverd torque fault), U1255 (Loss of class 2 communication)
2006 Buick Rainier CXL 4.2L rear speed signal VIN: 5GADT13S96
Hello, Customer complaint Right Rear brake grabs. Did rear brake inspection (disc with drum parking brake). Looked ok slight axle seal leak. (donít think a parking brake can grab from the leak) 1.Put on Scanner NO SPEED SIGNAL FROM RR REAR sensor. 2. Only hist...
1994 Cadillac DeVille 4.9L compressor VIN: 1G6KD52B0R
we have this deville in for replacement of comp, dryer e-tube and condenser. compressor was locked up. on start up with freon in the system the compressor came on for a couple of seconds and not since. we have tried the battery disconnect and have found no cod...
1997 Cadillac Eldorado 4.6L detonation VIN: 1G6EL12Y7V
Thanks in advance for all that are willing to help on this one. When this car is hot the engine pings under slight acceleration. You can power through it if you mash it to the floor. Fuel pressure is within specs. I have no codes. I can check the egr operation...
1997 Cadillac Seville STS 4.6L battery VIN: 1G6KY529XV
GOOD EVENING EVERYBODY.I have a customers car that if it sits three or four days the battery goes dead. After reading all the posts it seems there is alot that could be drawing from the battery.I know i do have a draw but having a hard time telling how big of ...
1999 Cadillac DeVille 4.6L no starter
can the ignition switch pass key system keep the starter fron ingaging. i can jump purple wire at intake and will start and run a second. will do the same from starer relay.i went to check car thinking could start it because he said battery was low.do not have...
2000 Cadillac Catera 3.0L abs,tcc,speedo VIN: W06VR54R1Y
has codes b1552,b1558,b1983,b2420,b2473,v1128,v1255,v2108,p1700
2004 Cadillac SRX 4.6L MIL Lamp on VIN: 1JFGTYXMNC
I have a 2004 Cadilat SRX in the shop that keeps coming back with P0172,P0175 codes.Acording to costomer tune up was done 20k miles ago with ac delco plugs. I replaced both upstream o2 with bosch with are same ones it had before. Replaced mass air flow sensor ... Trouble codes: P0172 (bank1 rich), P0175 (bank2 rich)
1997 Chevrolet Cavalier Z24 2.4L none VIN: 1G1JF12T1V
thanks in advance,the poping noise happens when moving forward or backward on uneven surface.we have put chasis ears on the strut,trans case,lower control arm,tierod,steeringrack and left side body sections and noise seems to be in and around the strut/axle ar...
1995 GMC Jimmy SL 4.3L firing VIN: 1GKDT13W6S
this is a nother gm nightmare not firing has not spark has power to the coil the modguel and crank sensor
1997 GMC Savana 2500 4.3L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GTFG25W3V
at start up runs rich both 02s over 1 volt and misses on cyl 1,3,5 injector pulse 3.o bank 1, 5.0 bank 2 engine light will then come on and go to open loop and smooth out checked ignition ok any help please
2003 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GKFK16Z03
vehicle was running ok.customer pulled out to pass a car and the check engine light started to flash,after passing the vehicle lost all power. i checked for codes and found a random misfire code,tested fuel psi it's 45psi i have many misfires on the left bank,... Trouble codes: P0300
2004 GMC Yukon XL 1500 SLT 5.3L transfer case shift control VIN: 3GKFK16Z54
This is my own vehicle, but I am a brake and front end guy so I don't have much experience with type of problem. The service 4wd message came on and set a code c0327 (encoder circuit). When I went to live readings, the car would not communicate with the scanne...
2005 GMC Yukon XL 1500 Denali 6.0L Unknown VIN: 1GKFK66U75
2005 yukon denali whistle sound from vents with a/c on doesnt matter what the fan speed or the temp is set to. when the sound occurs it will only last for about 5 to ten seconds no real repair related history we replaced the a/c compressor and reciever dryer a...
2006 GMC Sierra 3500 SL 6.6L compressor VIN: 1GDJC34DX6
After repairs flushed/charged system, fired truck and no compressor function. Tested sensors as stated above, but still not receiving signal from PCM Also truck has manual type a/c system Any help appreciated -Eric
1994 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G2WJ54M2R
I seem to have a common failure. this car has had both 3x and 24x sensors and the module replaced. now I am looking at it. I have removed the harness from the 3x sensor to the module, visually looks ok. I dont have a lab scope but can get one for Friday 7/31. ... Trouble codes: 82 (3X analog to digital error)
2006 Saturn Ion-3 2.2L Misfire VIN: 1G8AV15F36
has a bad miss on #2&3 cyl. all 4 spark plugs smell of fuel but are dry dont know how to check fire to plugs because the whole coil assy. bolts to top of plugs. How do you check fire to plugs? Trouble codes: P0300 (missfire it missfires on no.2 3 cyl)

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet llv mail 2.5L No Start VIN: 1GBBS10E9J
thanks to all who took time to reply.everything that was suggested we had tried already. what the fix seemed to be was when the engine was replaced the plug on the coolant sensor at the rear of the cylinder head was broken.it is a 2 pin sensor and the wire wa...
1992 Chevrolet Corvette 5.7L Poor Idle Quality, Surge VIN: 1G1YY23P8N
Thanks again guys. Walter, Phil and William were the winners. I ohmed the injectors cold and got 12.4 on all but #3 which was 9.8. I scoped it and had a shorted pattern with a kick down after turn off. Hot was the same reading on resistance. Replaced #3 and al... Trouble codes: 13 (left o2s or ckt), 45 (left o2s rich), 43 (ESC module or sens ckt).
1994 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1GCGK29F7R
I went ahead and pulled the timing cover off. This is a reman the cust. installed, with only 50 miles on it. I guess the reman company was short on timing chains! it looks like the chain was very well used, had so much slop I am surprised it didn't slip. repla... Trouble codes: 34 (stepper motor fault), 35 (injection pulse width error), 88 (tdc offset error), 9198.
2000 Chevrolet Monte Carlo SS 3.8L coolant fans VIN: 2G1WX12K2Y
A used compressor had been installed on the vehicle in an attempt to stop the noise and the refrigerant leaked down to a level that would not allow the fans to come on with the AC turned on.
2002 Chevrolet Silverado 1500 HD LS 6.0L Poor Idle Quality, Misfire VIN: 1GCGK134U5
thanks to all 8 replies.re-set the pcm w. factory programming. after customer called to say he had power programmer. and did crank re-learn. (labscoped fuel pump waveform ok. f/pressure ok.. did volumne test ok. the fuel sample was poor. added fresh fuel. rest...
2002 Chevrolet Malibu 3.1L Excessive Emissions, Poor Idle Quality, Cuts out, Stall VIN: 1G1ND52J33
Thanks for all the help guys it turns out there was a ground bundle that was broke and making poor contact, it was actually making enough cotact to run, repaired the ground and made sure it had good connection Been driving it for 2 days and no problems. Anothe...
2005 Chevrolet Corvette 6.0L Starting VIN: 1G1YY24U55
Thanks for the input guys. I went back out yesterday morning and looked over the data one more time. I checked every possible data list and still could not find a PID for "crank request". The vehicle still would not start. I disconnected the battery and touche...
2005 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDT13S15
when I checked Ign.1 my scanner showed 10.9 volts so I knew my ign. switch was go started to dig around un wireing harrness to injectors and back behind head and firewall found 7 wires chewed into made necessarry repairs on harrness Blazer runs great THANKS Trouble codes: N0NE.
2006 Chevrolet Cobalt LS 2.2L Cuts out, Stall VIN: 1G1AK15F66
Hello again, and thanks for the useful information, The ground under the headlamp appeared ok, but took it loose, cleaned it, and put it back together. Also I looked for the bulletin I was told about for injector contamination, could not find it. But I did com... Trouble codes: P0128, P0106, P0300.
1997 Geo Tracker LSi 1.6L Hesitation, Surge VIN: 2CBNBJ136X
Thank you for the help. Im glad I didnt buy a MAF. Three relpies were about the timing belt and gears It was a loose crank bolt. It wollered the keyway a little and wiped out the key itself,thank God for that.The pulley moved a lot so it was really retarding t...
1996 Pontiac Firebird Formula 5.7L Poor Idle Quality, Hesitation VIN: 2G2FV32P9T
had to close due to time. still working on car. i beleive my fuel trim problem may be intake gasket issue. looks like somebody was in there once and one bolt was only started a few threads. smoked intake and was getting a little smoke from intake but could not... Trouble codes: P1810, P1870.
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