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Prev Professional Automotive Repair Technical Discussions for April 25, 2012
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Open Help Requests for GM
Help Request Answers
1999 Buick Century Custom 3.1L valve train VIN: 2G4WS52M3X
customer stated engine click noise but will go away when accelerating. visual inspection of engine seen new intake gaskets. looking in engine through oil cap seen very little oil flow, and interior of engine was abnormally clean. removed oil pump drive manuall...
2003 Buick Park Avenue Ultra 3.8L Vtd VIN: 1G4CU54143
Hi group the customer drove the car to the restautant parked it for diner! later it would not start. He bought a battery from me, installed it still no start. I found a couple codes with no info on it in all data or indentifix!!.p1652 kam u1255 generic loss of...
2006 Cadillac SRX 3.6L Mechanical VIN: 1GYEE63746
Engine came in about a month ago for a PS leak and I notice SES was on with a P0008 Bank 1 cam performance. Scoped it and found bank 1 sync was off when compared to bank 2. Engine is very noisy and pulling belts made no difference, so I believe its chains. Cam...
1994 Chevrolet C3500 Cheyenne 6.5L High Pressure Injection pump VIN: 1GBKC34F0R
I hope that someone can help me...I have not worked on any of these motors before. I have a 1994 Chevrolet 6.5L Turbo Diesel, the vehicle was brought to me not running and the only info that I got from the owner is that he bought it at a auction not running. S...
1999 Chevrolet K1500 Suburban 5.7L Compressor VIN: 3GNFK16R3X
Thanks for the help. I need another set of eyes on this. Suburban came in A/C inop, System was flat (empty). Customer stated "someone put 8 cans in, on my vacation to try and stop a leak". well i found o-ring gasket under combo hose to compressor blown out and...
2001 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GCEC14W41
All cyls showintermittant misfire, very low count. #4 is the only one that will misfire when hard accel, downshift,rpms over 4000, trans upshifts then #4 begins to misfire and will continue until decel and reapply throttle, misfire stops. We can duplicate ever... Trouble codes: P0300
2002 Chevrolet Trailblazer LT 4.2L starter VIN: 1GNET16S82
This Trailblazer has had repeated Ign. switch failures and someone butchered up the housing that holds the lock cylinder. (looks like they used a chisel and die grinder to change the lock clyinder) I know that this Intermittent no start is caused by the common...
2004 Chevrolet Colorado LS 3.5L abs code VIN: 1GCDS136X4
A few weeks ago we had a 2004 Chevrolet Colorado Z71 come into our facility with a C0035 and a C0220 codes preset. The customer said the ABS light would come and go at random. We had tested the left front bearing and found the sensor to be faulty. We had repla...
2005 Chevrolet Uplander LT 3.5L battery VIN: 1GNDV33L45
has a intermentent dead battery. every time the van has come in for this complant and we check draw after 30 minutes wil drop to .019 volts. i have read online that a lot of owners of uplanders have this same problem. it does have problems with power sliding d...
2006 Chevrolet Cobalt SS 2.4L No Start, MIL Lamp on VIN: 1G1AM15BX6
Hello all. I have this unusual issue with this vehicle. The original engine did crank, but had no compression. I ordered a used engine from a junk yard, and saw that originally the vehicle had a oil cooler, but the motor they sent me did not. Cause I wanted to... Trouble codes: P0107 (MAP or BARO Pressure Signal Low), P2119 (Throttle Closed Position Performance), P0335 (CKP Sensor A Circuit Problem), P0651 (5 VOLT Refrence 2 Circuit)
1966 Pontiac GTO 6.4L tach VIN: 242676P344
need wiring info for tach in rally pac cluster. thank you.
1995 Saturn SL1 1.9L Radiator Fan VIN: 1G8ZH5284S
Car came in with no ac and cooling fans wired strait to power(running all the time). Customer wanted to have ac and the fan working properly. Ac system was empty so charge it up. I connected the fans propertly to it original connector and ac works fine compres...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac SRX 4.6L Surge, Stall, MIL Lamp on VIN: 1GYDE63A64
First Thank you for all the replies, even though there was only a few. The last time the car was in, we soldered the TBI connector wiring, and inspected all other wiring. The customer is trying to get the wiring harness from the OE engine. We have not heard fr... Trouble codes: P0013 (exhaust camshaft position actuator solenoid control circuit bank 1 passed), P2119, P0122, P0223, P2135, P2176.
2006 Chevrolet Impala LS 3.5L Does not engage in any gear VIN: 2G1WB55K16
After getting a few replys stating that I should still have 3rd and reverse even if its an electrical problem I gave the customer the option of tearing into it or replacing it. The customer choose to just replace it with a used unit. Swapped in a used unit w...
2006 Chevrolet Malibu SS 3.9L MIL Lamp on VIN: 1G1ZW63126
The customer never came back so no gnews is good gnews. As stated before I replaced the filler neck. The plastic cap at the end was broken. If someone reads this be wary...if you pressure test it like I did you might find the vent valve staying closed. I t... Trouble codes: P0442 (evap small leak).
2008 Chevrolet Silverado 1500 WT 5.3L power door lock VIN: 3GCEK13368
Thanks for all the replies, most said the lock actuators had high failures, and that is what was wrong. New actuators and it works perfect. I used a NOID lite from an old assortment to check power to the lock actuators, the terminals are very small. Supposedly...
1990 GMC Safari 4.3L Stall VIN: 1GTCM15Z8L
thanks again to all the replies after alot of testing i ended up finding a weak coil. the coil ohmed out good but intermitenly would drop out. so the fix was a distributor and a coil.
2006 Pontiac Torrent 3.4L MIL Lamp on VIN: 2CKDL63F76
Thanks to all who replied!! Replaced TAC part of trottle body but first checked for water intrusion behind kick panel found nothing. I guess carwash was just a coincidence?? Trouble codes: P1125 (App sensor problem), P1238 (App sensor coraolation).
2007 Pontiac Solstice 2.4L Electronic VIN: 1G2MB35B27
Absolute lack of information from GM. After lots of research, we determined that the torque signal from the ecm must be created by the ecm using various other signals. It is not clear what signals are used, however according to other forums, it must use the ...
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