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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 13, 2009
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L 1-2 shift VIN: 1G4CW52KXS
Just a quick question, this trans won't shift to 2nd or 3rd scan data says it did. We have no reverse just first gear in od or drive, won't shift manualy either. A slight bit of noise in park that goes away in reverse but won't engage reverse.I'm thinking soli...
1998 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52K5W
i have been pulling my hair out and don't have much more to pull so i need some help. this buick will stall and / or not start at times, in the last 6 months this has happened 5 times. the car will start and run normallt then they put down the power window and...
2003 Buick Park Avenue Ultra 3.8L mode door VIN: 1G4CU54133
The vehicle HVAC will duct to floor intermittently whether in automatic or manual operation. Voltage went low to the mode door servo according to monitoring the servo with a genysis scanner. The mode door servo would operate correctly with scanner control, 100...
2004 Buick Park Avenue 3.8L Display & blower VIN: 1G4CW54K74
Hello GM guys. Customer has two complaints on this Park Ave with auto/dual climate control. First is that the controller display [center of dash directly below radio] is very dim/hard to read or may blank out completely at times. Seems to be ok functionally wh...
1995 Cadillac DeVille 4.9L a/c fan fan motor VIN: 1G6KD52BS4
auto a/c, blower motor stays running w/ key onn,pretty sure its the control under hood butcould use a little help
1991 Chevrolet Lumina 3.1L No Start VIN: 1234567TNM
car had jumped timing chain,bent vavles,replaced chain and heads,no spark,replaced ign module with one off a running car,have ac voltage from crank sensor.checked for dis pulse ref hi with test light -nothing?checked res all inj good.checked powers and grounds...
1992 Chevrolet K3500 Silverado 5.7L every gear VIN: 1GBHK34K1N
I work for a school system in North Carolina we are having a problem with this transmission making a noise under a load only. The noise sounds like a knocking that is in every gear. The noise will not change with speed it is constant as soon as you push in the...
1993 Chevrolet Camaro 3.4L abs VIN: 2G1FP22S9P
Scanned abs codes 24, RR Wheel speed is 0 mph 28 Excessive RR wheel acceleration Road test with Verus, rear sensor drops to 0 at about 7mph. Wiring harness checked from control module to sensor, no shorts or opens, ohm sensor it was in specs but replaced any...
1996 Chevrolet K1500 Silverado 5.7L Steering VIN: 2GCEK19R1T
the truck has hard spots in the steering when sitting still. it was doing this and i replaced the pump and sector and it was fine for a while and then it started again. it steers fine when moving. you can increase the rpms and it gets better but still has stif...
1999 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W6X
vehicle was towed in three weeks ago with a no start condition. found injector unit leaking. replaced with mfi unit. vehicle ran well, cust took and brought it back 3 weeks later running rough. it had a p0300. misfire monitor showed cyl.#1&6 counting up misfir... Trouble codes: P0300
1999 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GTCT19W4X
Please provide any suggestions- runs great, but no tach and MIL on for code PO340 Trouble codes: P0340
2001 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W91
This blazer came to shop with starting problem after short soak. I tested fuel pressure at still and was 45 lbs, cranking 45 lbs. I could not duplicate the problem till after about 3 hours in shop trying. It did it and will no catch while cranking, i poured a ...
2002 Chevrolet Silverado 1500 4.3L Clutch, throwoutbearing VIN: 1GTEC14W02
Hello, I'm working on this 5-speed manual transmission truck, probably a NV3500. It has a rattle type noise coming from the transmission, which seems to wind down and go away once you push the clutch in. It seems opposite of a throwout bearing noise, so we sus...
2002 Chevrolet Tahoe LT 5.3L lines VIN: 1G1YY32G5Y
customer needs a brake line thats not avalable, the new line needs to be spliced and i know it should be a double flare, management thinks a compression fitting will be ok!? any ones opinion on this,and if any one knows of any ''code'' of repair.this may seem ...
2004 Chevrolet Silverado 2500 LT 6.0L MIL Lamp on VIN: 1GCGK23U44
This truck is becoming a life long project and we want to find the fix. The truck looses power. The accelerator pedal looses response. When the truck looses power the POWER LOSS LIGHT appears on the dash. First time fix was a broken wire at the throttle body c... Trouble codes: P1516
2004 Chevrolet Optra 2.0L AC System VIN: KL1JD52Z44
Hi all, this Optra has a very small capacity AC and any reduction in performance is very noticeable. I last leak tested it on July 29th and today it was about a half pound low. Please let me know if any of you hard working GM techs have had a similar problem o...
2006 Chevrolet Silverado 1500 LS 5.3L Blower VIN: 3GCEK14Z16
This one should not be A hard one but we all know how it goes.This truck came in for the normal blower inop at any speeds pulled the plug off of the resistor sure enuff it was melted so i installed a blower motor resistor and new harness easy fix right,wrong.N...
2006 Chevrolet Impala LT 3.9L compressor VIN: 2G1WS55136
This car came in the shop because the a/c will only cool when the car is idling. Checked freon it was a little low so I recharge system to correct amount. Car still will only cool while car is idling. The low head pressure is @ 41-42 psi @ about 96 degrees out...
2007 Chevrolet Silverado 1500 LT 5.3L Surge VIN: 2GCEK13397
truck came to our shop with check engine light on with code po121. engine running good. we did clean the throttle body and the light is off but when you touch the pedel the rpm stay about 2000 rpm. turn the key off and restart the rpm is good until you touch t... Trouble codes: P0121
1998 GMC Suburban K2500 7.4L MIL Lamp on VIN: 1GDGK26J4X
This vehicle came in initially with the customer saying the service engine soon light on. Initial inspection found that the MAF had been contaminated by the oil from the K&N air filter in the vehicle. Replaced MAF with a GM unit, cleared the codes and customer... Trouble codes: P0102 (Mass Air Flow Circuit Low Frequency)
2002 GMC Sierra 2500 HD SLE 6.0L Misfire VIN: 1GTHK29U62
Hi There any help in advance is greatly appreciated. This truck came in with flashing Engine light at speeds above 60mph but no drivability concern. Truck runs excellent. Searched archives and found possible needs crank relearn. Tried with otc and snap on and... Trouble codes: P0300
2005 GMC Sierra 1500 4.3L No Start, Cuts out, Stall VIN: 1TEC19X25Z
Hello bowtie techs!!! This GMC came in with complaint of stalls and then restarts! Verified the stalling almost didn't get around block! stumble then some sputtering. NO CODES ! misfire counts were less than 100 in history all cyls!! Fuel pressure stayed at 60...
2002 Oldsmobile Bravada 4.2L cooling fan VIN: 1GHDT13S92
Customer came in with CEL on. Reduced power light was on intermittently. A scan for codes came up with P1484 cooling fan speed error. This fan has been replaced with an OEM clutch 35000 miles ago. a test drive produced normal fan operation, and with the modis ...
1999 Pontiac Grand Am SE 3.4L alternator VIN: FKKLSDHAA1
car came in not charging, big batt + wire was melted from heat. replaced alt now charging good and wire still getting very hot, tried running a new wire directly to batt + and new ground from batt - to alt case. still wire gets very hot. alt tests and charging...
2005 Saturn Relay-2 3.5L Tach VIN: 5GZDV23L35
The tach is not working correct. It is almost like the needle has slipped ,it is pointed down. It does move when you start the engine.When you increase the engine speed it moves upward but never reaches the numbers on the tach. No trouble codes are stored.I di...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac DeVille Concours 4.6L Poor Idle Quality, MIL Lamp on, high idle VIN: 1G6KF5496X
Thank you gentlemen who replied to my help request...The P0601 was indeed a pcm slayer and I ordered a PCM from our local dealer the PCM was installed and programed last evening and a complete test drive done this morning...The transmision shifted OK and sp... Trouble codes: P0601 (Loss of PCM memory).
1993 Chevrolet Cavalier Z24 3.1L Poor Idle Quality, Surge VIN: 1G1JF34T9P
thanks to all for the help this one drove us crazy for a while however the fix was easy I waited untill idle began to search then tapped on the ecm and the idle smoothed out so I replaced the ecm and all is well again thanks to all
1997 Chevrolet Cavalier Z24 2.4L none VIN: 1G1JF12T1V
Big thanks to all who responded to my help request.Many of you said it was the wheel bearing,we checked our to find that did install an el-cheapo bearing.Replaced it with a good grade bearing and the poping noise is gone! Thanks again.
1998 Chevrolet K3500 Cheyenne 7.4L engine VIN: 1GCHK33J0W
Thanks to all of the knowledgeable technicians that responded. In 20some years as a tech this is the first time i have come across fuel tank vandalism. After further inspection on vehicle today, I found what tasted like cornsyrup spilled on side of truck jus...
1998 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCS13W2W
2001 Chevrolet Silverado 3500 6.6L Cuts out, MIL Lamp on VIN: 1GCJK33101
Vehicle is fixed, Replaced the high pressure pump. System nows runs at 160Mpa when commanded. Fuel Vacuum test still shows it at 4.65 inHg and under full load goes up to 10.6 inHg. Changing the pump was a bit of a bear but managed to get it in 5.0 hrs. Had to ... Trouble codes: P0093 (Large Leak Detected).
2004 Chevrolet Silverado 1500 LS 5.3L Seat Heater VIN: 2GCEK13T54
thanks for all the replies guys, patrick was right on with the ohm spec being 1.5 -5.5. The bottom was 4.2 ohms and the back was 9.1 ohms so I disassembled it and the back had a burnt spot. It amazed me that it still had only 9 ohms resistance. Another point...
2006 Chevrolet Express 2500 4.8L Flasher Fuse VIN: 1GCGG25V86
vehicle still has not returned. i am calling it fixed. thanks to all who replied.
1991 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WJ14T2M
Thanks to everyone who replied. The CPS was new so I replaced the signal wire just to be sure. Pulled the plenum and ohmed out the injectors. Had only two inectors in spec. Cyl #5 was .6, cyl #3 was 12.7ohms, cyls #1 & #6 were 13.2 & 13.3 ohms respectively. T...
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