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Prev Professional Automotive Repair Technical Discussions for August 25, 2009
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Open Help Requests for GM
Help Request Answers
1998 Buick Century Custom 3.1L Surge VIN: 2G4WS52M4W
ok iam havin trouble pin pointing this one. Customer has been talking to me about it for 1 1/2 half it is slowly gettin worse. Got a light surge present at highway speeds light steady throttle (but accelerating) customer says hot days and inclines is when he n...
2003 Cadillac Seville STS 4.6L Wheel Balance VIN: 1G6KY54993
This is my personal vehicle. I keep getting a vibration thru-out the whole car starting at 65mph thru 75mph. This has been an issue since I bought the car 3 years ago. I have made several attempts to re-balance the tires using both a non-roadforce balancer and...
2006 Cadillac DTS 4.6L R/F Suspension VIN: 1G6KD57976
This Caddy has a solid noise in the right front when driven up a drive way or over a solid bump. We replaced the front sway bar bushings because they were worn pretty good and we wanted to eliminate them as a possible cause. The noise is still there. We dont s...
1995 Chevrolet Cavalier 2.2L No Start
Hey guys and girls.I need to know what the proper wires are for pcm powers and grounds in the 2 pcm connectors.I have a 1995 schematic but 2 wires are wrong colours.Thanks to all who can help.K.W.
1995 Chevrolet Camaro 3.4L oil pump drive VIN: 2G1FP22S1S
vehicle has quite an oil leak at top rear of engine running down both sides. pretty sure it's the oil pump drive o-ring but can't get a good look at it. just hoping someone who has had the upper intake and fuel rail off of one of these can reassure me that it ...
1998 Chevrolet C1500 Silverado 4.3L fuel guage VIN: 1GCEC19W3W
have fuel guage problem with 1998 c1500. replaced fuel pump and harness and now customer complaining guage is not accurate. tank was at 1/8 on guage.removed pump and found tank 1/4 full.put pump back in with key on tank reads 1/4 which is about right. start ve...
2003 Chevrolet SSR 5.3L loss of coolant VIN: 1GCES14P73
car came in april for lof.no complaints from customer but we noticed alot of atf in coolant.found coolant in trans also.replaced rad,tstat,hoses and flushed and flushed engine and trans,got 90% or more clean.took a very long time.car came back in about a month...
2004 Chevrolet Silverado 2500 HD LS 6.6L overheats VIN: 1GCHK23214
Truck seems to run 10-15 degrees hot at all times. Fan kicks on when towing on flat road and stays on almost continuously (75 deg ambient). Radiator seems clean and clear of debris, no aftermarket grille. Towing a 7200lb travel trailer seems to really make thi...
2005 Chevrolet Cobalt 2.2L Misfire, MIL Lamp on VIN: 1G1AK52F25
hello guys. we have this cobalt with two dead holes, cylinders 2 and 3. engine has good compression on all holes. verified there is no spark on cylinders 2 and 3. misfire counters through the roof on the scanner for these two cylinders only. i verified power a... Trouble codes: P0300
2008 Chevrolet Tahoe LT 5.3L abs VIN: 1GNFC13J28
Thanks for reading, vehicle came in after being in a wreck front end damage ABS light Traction light Brake light all on codes are u0140 u0151 u0159 u0164 u0168 u0214 u0109 any help will be greatly appreciated thank you in advance
1999 GMC Jimmy Envoy 4.3L engine VIN: 1GKDT13W8X
Hey guys, i have this blazer that came into the shop yesterday with a seized engine. the customer has given the go ahead on a new engine. the problem is that im unable to remove the torque converter bolts due to the seized engine. it seems my only options are,...
1999 GMC Jimmy SLT 4.3L transfercase VIN: 1GKDT13W6X
hello techs, this vehicle came to us with "service 4wd" light on and 4x4 switches not working.we hooked up the TECH 2 but there were no codes (powertrain, body, or chassis). alldata does not give a lot of help if there are no codes. if there's anyone that can ...
2000 GMC Jimmy Diamond Edition 4.3L Engine Oil Pan VIN: 1GKDT13W8Y
Owner states, noticed oil spots located under oil pan area under parked car. Visually inspected oil pan, appears to have oil leak from front area of oil pan near engine block. I think the engine oil leak is coming from the front crankshaft rubber seal that sea...
2002 GMC Envoy SLT 4.2L headlights VIN: 1GKDT13S12
this vehicle came in with no low beams, found bulbs blown, connectors burnt on ground side. replaced bulbs and connectors. same problem one week later, ck alternator, 12.4 v.-14.6v constant. no spikes at all. are these vehicles known for having ground problems...
2007 GMC Acadia SLT 3.6L Cooling Systems VIN: 1GKER33737
This SUV comes in for service and we detect a coolant leak. Looking at the engine as best possible, we see coolant coming off the bottom of the water pump. We called the customer and gave him a price, but we told him we would make the final call on the water p...
1996 Oldsmobile Cutlass Ciera 3.1L DLC pin 16, EBC module, TR switch VIN: 1G3AJ55M1T
This vehicle had fusible links that were "compromised" and repaired to correct working conditions - all systems on burnt links now function properly. Currently pin 16 at the DLC, the EBC module, and the TR switch have no B+ available. The wiring diagram shows ...
1994 Pontiac Grand Am SE 3.1L Unknown VIN: 1G2NE55M1R
This car is producing an odor nothing like I have smelled before the customer notice it a few days after we put in a heater core and water pump. It is strong under the hood near the pass side inter fender close to the engine mount (has a new engine mount). Aft...
1997 Pontiac Grand Prix GT 3.8L starting system. VIN: 1G2WP12K6V
Hello fellow techs. I have this pontiac with an itermittent no start. You turn the key and nothing happens. Looked for anti-theft codes and none are present. Tried different keys to no avail. It starts most of the time. The nuetral safety swith and ignition t...
1997 Pontiac Firebird 3.8L No Start, Stall, MIL Lamp on VIN: 2G2FS22KXV
Customer states if they drive for a short period and stop and run into a store then restart it will run rough and die and set a p0300 then it will clear up and run well. We cannot duplicate problem but were wondering if anyone had seen this before. fuel pressu... Trouble codes: P0300
2001 Pontiac Bonneville SE 3.8L Cuts out, STARTER WILL STAY EN VIN: 1G22HX54K8
My problem cars always seem to come in 3s and this is the 3rd one so once I fix this one Ill be good for awhile. This thing is doing some wierd things . Customers original complaint was it died on her and wouldnt restart. it got here started right up no proble...
2003 Pontiac Bonneville SLE 3.8L Windsheild Wipers VIN: 1G2HY54K43
We replaced the ww switch and wiper motor. The wiper motor was aftermarket rebuilt. Vehicle came back with wipers not shutting off. We replaced the motor with rebuilt again - vehicle came back 1 month later with wipers not shutting off. We replaced motor with ...
1995 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5277S
***vehicel has a code 26,27 fault Quad driver B*** This vehicle came in with a complaint of coolant leak and mil. customer also stated that on occasion the vehicle would stay in 2nd gear and not shift. I figured this could possibly be due to the mil lamp on bu... Trouble codes: 26 (Quad driver QDM failure), 27 (Info Flag Quad driver module fault), 81 (info flag ABS message fault), 83 (info flag low coolant level)
2000 Saturn LS2 3.0L head gasket VIN: 1G8JW52R4Y
we changed head gaskets & machined heads because of water in the oil, we now have oil in the water but no water in the oil.

Fixes & Summaries for GM
Fix/Summary Answers
2007 Buick Rainier CXL 4.2L MIL Lamp on VIN: 5GADS13S24
1993 Cadillac Allante 4.6L Lighting VIN: 1G6V53391P
Thanks for the help! After reading Tim from New Jerseys post I reluctantly checked out the allantesource.com then called them up . I hate bothering people with queations like this, But I wasnt getting anywhere. They were very friendly and after explaining what...
2002 Cadillac DeVille 4.6L Poor Idle Quality VIN: 1G6KD54Y82
Thanks to all that helped,well it turned out to be the wire harness between the Throttle body and PCM,Made a short harness using the the pigtail I replaced early,PCM is only about a foot away from the IAC.Road tested (drove it home) All is good again! Thanks... Trouble codes: P0506 (Idle speed low).
1995 Chevrolet P30 5.7L Hesitation, Cuts out, Stall VIN: 1GBHP32K0S
It has been about a month and the truck stalled only twice. It is considerably difficult to diagnose such an intermittent problem. I hate telling the customer that the problem has to get worse for me to find but I am afraid that is the case. When it "really...
1999 Chevrolet Corvette 5.7L propeller shaft VIN: 1G1YY22G5X
Appreciate all the replies. Today we see the problem is at the front support bearing. The propellar shaft must have part of the bearing or support around it and has broken loose inside the tube. At this point it appears the whole assembly will probably need r...
2000 Chevrolet Astro 4.3L Hesitation, Surge, Cuts out VIN: 1GMDM19W3Y
This vehicle is still not fixed. Dropped the exhaust off of vehicle and it still performs the same. Fuel pressure peaks at about 60 then drops to 56 koeo then started it runs at 54 when you floor it it goes to 60. If you set timing according to the mark on the...
2003 Chevrolet Suburban 1500 LT 5.3L drivers door lock,window,mirror VIN: 3GNFK16Z83
Hello again and much thanks to those who confirmed my diagnosis, the drivers door module"master switch" was bad. Many said to replace it and reprogram it, well the customer opted for a used part, popped it in and it worked like a champ. thanks Shawn
2004 Chevrolet Impala LS 3.8L radio VIN: 2G1WH52K14
Yes! I was just beating my head against the wall.This one is deemed a radio failure.As many mentioned this is a "new model" radio,and pressing the presets does nothing. As with the rest of the modules in this car,they all require vin sent over bus to verify co...
2005 Chevrolet Silverado 3500 6.6L Poor pedal VIN: 1GCJK33265
Hello and thanks to all that replied. At the moment customer has not returned for me to repair vehicle. Based on everyones replys and my instincts the plan of action on this vehicle is to pull all the pads and free up any binding of the pads in the mountsand t...
2001 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NF52T51
Well Guys... You Nailed it agian... After smokeing it,and even using a vacuum pump to draw the system into a vaccum and finding nothing, We finally droped the tank as indicated and replaced the o ring(and we found it siliconed in!!!). So thanks guys you were r... Trouble codes: P0442.
2006 Saturn Ion-2 2.2L oil leak VIN: 1G8AJ55FX6
Thanks to Kevin for the TSB 06-06-01-013. That should do it. 2 oil galley plugs in the back of the engine loosten up. Sorry I forgot to check TSB's first but hopefully this will help someone that does the same.
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