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Prev Professional Automotive Repair Technical Discussions for June 4, 2009
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Custom 3.8L starter VIN: 1G4HP53L6N
This car was towed into our shop with a no start problem. The starter was totally oil soaked. We installed a new starter. Security light "ON" and still no starter engagement. Replaced antitheft relay as per TSB. If relay is jumpered, the car will start and run...
1995 Buick LeSabre Limited 3.8L Stall VIN: 1G4HR52L3S
vehicle came in stalls and dies , will restart. Check history found new fuel pump, module , tune up.Ckecked for codes with snap-on graphing scanner and found OBD2 16 pin connector only , tried to gather data but no communication on scanner.tried all keys to sc...
1999 Chevrolet K1500 Suburban 5.7L blower VIN: 1GNFK16R7X
Hello all, I have this Burban thats kicking my tail. Any help will be greatly appriciated. I know there has got to be some information in the archives but I'm having a problem navigating that section. The problem is no ac or blower control. I felt as though th...
2000 Chevrolet Suburban 1500 LT 5.3L Hesitation, Cuts out, MIL Lamp on VIN: 3GNFK16T4Y
This truck revs up supper slow. Huge hesitation when driving. Feels as if starving for fuel. We did replace fuel pump with delphi unit and replaced connector and made sure fuel pump ground is OK. We also tried a MAF with no improvement. Clearing the codes and ... Trouble codes: P0137, P0157, P0753
2001 Chevrolet Tahoe 5.3L Brake light VIN: 1GNEC13T41
The "BRAKE" light stays on with no "ABS" light. No codes stored in system.
2004 Chevrolet Malibu LS 3.5L alternator control VIN: 1G1ZT54834
Hi everyone, I have a wierd one here. Customer complaint was batt light comming on going up hills. Removed alt and had it tested, it worked ok but the rebuilder recommended a new regulator. Got alt back and installed. Customer drove car 2 days and brought it b...
2005 Chevrolet Uplander LT 3.5L warning light VIN: 1GNDV33155
Greetings! We usually pass on the ABS work due to the fact that we lack the equipment and information to do it. But, this lady insists the we at least check it out for her because she can't afford to go to a dealer right now. Each time she comes into the sho...
2007 Chevrolet Silverado 3500 Classic LS 6.0L Brakes VIN: 1GBJK34U97
Need help from all you ford tech's. this truck is drving me nuts. The customer brought the vehicle into the dealer for the spongy brake pedal and did a full brake inspection finding no issues, they did cut the rotors for some reason saying that it might help b...
2003 GMC C7500 7.2L MIL Lamp on VIN: 1GDK7J1C03
hello everybody, any help or suggestions are appreciated. i have a 2003 gmc c7500 with a cat. 7.2 3126. only problem i have is a non stop blinking check engine light, it blinks about every 5 seconds. i have cat. et software and there are never any codes. there...
1988 Oldsmobile Cutlass Supreme International 2.8L No Start VIN: 1G3WR14W2J
vehicle was in the shop about 2 months ago for emission problems . checked codes none, but noticed pid data showed bad sensor readings ect -40 tps 2.90v etc replaced pcm after checking sensors,connections power and grounds. after replacing pcm i got a code 51 ...
2002 Oldsmobile Alero GX 2.2L No Start VIN: 1G3NK52F02
Hello All: This car was towed in to the shop and it started fine when unloaded. According to the owner she had been experiencing intermittent issues with it for some time. It had been to the point of leaving it, for up to an hour before it would restart for he...
1994 Pontiac Firebird 5.7L No Start
Vehicle will not always start. Checked basics: found spark and proper fuel pressure but no pulse at injectors. Car would intermittently pulse at injectors and sometimes could get it to start. But when it wouldn't start (which is most of the time), there was no...
2004 Pontiac Grand Prix GT1 3.8L Blower Motor VIN: 2G2WP52204
Customer came in with inop. blower motor. Fuse #30 in the underhood block was blown. I looked in the fix database and read about a resistance test across terminal A and D at the blower motor control module and my resistance was .04 ohms. According to him it wa...
1998 Saturn SL 1.9L Engine VIN: 1G8ZF5288W
This car belongs to a friend. He just bought it for his wife as is having been told that it needed a head gasket. This car has a significant amount of oil in the coolant. The old chocolate shake in crankcase & coolant concern. I've already read through all of ...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Century Custom 2.5L No Start VIN: 1G4AH51R65
Thank you very much for all the responses to my post and I apoligize for the late close. Being a one man shop these type of things sorta get put aside. I replace the injector twice for I broke the first one- oops, as suggested by Tim mitchel,Bill [...] Rob Tur...
1999 Buick Regal GS 3.8L power loss on accel. VIN: 2G4WF5219X
To all; I am sorry this took so long, but I thought I had closed this post. I did repair the vehicle, most of the responses i got leaned toward fuel pressure or MAF. The fuel pressure was good throughout the range even when problem was occuuring. The MAF and f... Trouble codes: P0300.
2000 Buick LeSabre Custom 3.8L Radio VIN: 1G4HR54KX5
Thanks for the help. Most replies suggested a new radio, which I tend to think it is. The customer wanted the car back so I didn't get to finish fixing it. I suggested installing an after market radio, but they didn't know. If anything else comes up I will pos...
2004 Buick LeSabre Custom 3.8L steering VIN: 1G4HP52K14
Thanks for all the help. After watching the pressure gauge when problem accured psi was only 650 psi. Needed 950 psi to get to steer the way it should. Replaced the p/s pump this repaired my problem child buick. Now psi at idle steer will go over 1000 psi and ...
2005 Buick Park Avenue 3.8L Blower motor VIN: 1G4CW54K05
Hello everyone! Sorry for such a delay. The customer has not returned as of yet. So I am of the believe that he may have had bad contacts at the blower motor or one of the related connectors. If I do get a chance to fix the vehicle, I will be posting an answer...
1971 Chevrolet Corvette 454CID starter,flywheel VIN: 194371S117
A big thank you to those who responded. I went thru every right hand mount starter that I could lay my hands on via our local NAPA store, all measured the same regarding the depth of the drive pinion travel. I opted to install another rebuilt starter for the...
1994 Chevrolet K1500 Suburban Silverado 5.7L Mechanical VIN: 1GNFK16K1R
The rear expansion valve was bad. Replaced with a AC Delco expansion valve. A/C is now blowing cold. Thanks for all the help!
1995 Chevrolet Astro 4.3L tcc quad driver module VIN: 1GBDM19W9S
We are calling it fixed. Releasing it to the customer and hope we don't see it back Monday morning! The fix was a computer with prom (chip). Thank you to all who replied. We did check each thing you recommended. Here is what we found. The transmission is elect...
1996 Chevrolet Cavalier 2.2L No pcm/theftlight on /no main relay VIN: 3G1JC5249T
Thanks again for everyones ideas.It turns out to be one bad pcm ground toG110 under battery in the wire harness. thank You again.Ari
1996 Chevrolet Lumina 3.1L Hesitation, Surge, Cuts out, Misfire VIN: 2G1WL52M3T
The fix for this one was repairing the wiring harness from 7x crank sensor to the ign cont mod. The long version below for those interested... Many thanks to all who took their time to read my post and offer their advice. The problem with this car is/was ...
1997 Chevrolet Blazer 4.3L Misfire, Spark knock VIN: 1GNDT13W4V
I recieved a lot of replies on this one. Most replies pointed towards the distributor cap and shaft or gear wear. A lot of replies also mentioned fuel pressure. I had checked pressure and volume and they were good, my bad for not including that info. We fixed ... Trouble codes: P0300.
1998 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R4W
Hi Guys, Sorry, it took song to respond. I have been extremely busy and I wanted to give the customer a chance to drive the truck for a while. I have learned a lot from this truck and I will never forget this one. The fix was a shim under the crank position se... Trouble codes: P0300.
2002 Chevrolet Express 2500 5.7L Misfire VIN: 1GCGG25RX2
We definitely overlooked testing for fuel volume. Pressure was good in the bay, both at key on as well as running under a load. When checking volume, we came up a little short, so we pulled the fuel filter and found that it was clogged. Replaced filter and ... Trouble codes: P0101 (Mass air flow sensor), P0300 (Random misfire).
2006 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Cuts out, MIL Lamp on, no throttle control VIN: 1GNET16S76
Well this one got me...I've always tried unplugging a mass airflow sensor to see if is causing problems as I've found they sometimes do not set codes and can still have good scan tool readings. Well unplugging this one had no effect on running (still ran bad) ... Trouble codes: P0068, P0300, P0171.
2000 GMC C3500 Sierra SL 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: 1GDKC34F5Y
Hey Everyone,First of all thanks for all your help.What I ended up finding was an obstruction in intake from turbo to upper plenum,rubber hose and inside coil came apart and got stuck in elbow to Intake,Very strange lots of oil from breather must have compromi... Trouble codes: P0236 (Turbo boost control).
1996 Pontiac Bonneville SE 3.8L Cuts out, MIL Lamp on VIN: 1G2HX52K3T
Low and Behold it was indeed the PCM. It goes to show that sometimes you shouldnt second guess yourself. Installed nwe pcm and reprogrammed and check eng light is out and both o2s are switching again. Trouble codes: P0134.
2000 Pontiac Montana 3.4L rear air switch VIN: 1GMX03E6YD
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