Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 1, 2010
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
2003 Buick Park Avenue Ultra 3.8L engine VIN: 1G4CU54133
Hi Guys, this is a really clean Park Ave Ultra. It came in with cracked front and rear engine mounts. We replaced mounts with aftermarket mounts and customer states now has vibration at idle in gear that was not present before. Verified Idle vibration. Scanned...
1990 Cadillac DeVille 4.5L Speedo VIN: 1G6CD5330L
I did brakes and A/C compressure on this vehicle on my test drive after about 18 miles of driving speedo started to not read when pulling away from stop then would jump to 40 mph then worked the rest of the 30 mile test drive. After checking over for a/c dye t...
1999 Cadillac Escalade 5.7L Misfire, MIL Lamp on VIN: 1GYEK13R1X
I have had several of these gm vehicles equipped with the 5.7 l motor with this same p0300 under load at about 50-60 one cylinder is consistent.but it seems that the middle cylinders are most often affected.this cad.looks great on scope and when power b... Trouble codes: P0300
1998 Chevrolet C1500 Silverado 5.7L wipers/airbag VIN: 1GCEK19R2W
Vehicle was involved in frontal impact and deployed drivers air bag. Replaced bag and hooked up battery and the wipers came on and won't shut off. They worked before I unhooked the battery. Thanks in advance for the help. Dustin.
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S62
Looking for someone with experiance on these systems. this vehicle has lots of miles on it and runs pretty good. The check engine light has come on with a cam timing fault. If cleared it will return. There is an intermittant noise which seems to be coming from... Trouble codes: P0014
2002 Chevrolet Silverado 2500 HD 6.0L Launch Shudder/Vibration on Acceleration VIN: 1GBGC24U72
Truck has a Shudder/Vibration on Acceleration
2005 Chevrolet Colorado Sport 3.5L No Start, Hesitation, Surge, Stall, MIL Lamp on VIN: 1GDCT23V95
Customer complained of stalling, hard start, running rough. Found code p0017 for camshaft actuator performance. checked connectors for camshaft oil actuator and exhaust cam position sensor; ok. test drove three times for long test drives while monitoring desir... Trouble codes: P0017
2007 Chevrolet Equinox LT 3.4L No Start VIN: 2CNDL63F97
Thnaks in advance for any help. This is a 2007 equinox with auto trans. Vehicle was brought in for an intermittent ses light on. We scanned the vehicle and found no codes stored. Tech tried to start vehicle to test drive and found a no crank condition. scanned... Trouble codes: U0140 (Loss of communication to bcm)
1993 GMC K2500 Sierra 7.4L compressor VIN: 1GTGK29NXP
Customer came in and stated that he had an intermittent compressor. The system was R12 and he was curious about converting. I told it wasn't much of a problem but he needed a few parts. The compressor was leaking so I suggested a kit and retrofit to 134. I pul...
1995 Oldsmobile Silhouette 3.8L stumbles on start VIN: 1GHDU06L95
Hi Thanks for taking the time to read this. I havent seen this before. Upon cranking to start it sounds as if the timing is over advanced, it will spin grunt and then start. If it had a distributor i would retard the timing.But it dosent so I cant. No codes st...
2001 Oldsmobile Silhouette GL 3.4L No Start, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GHDX13E61
car dont start but after seat over 3 or 4 hours , or over night the car will start fine and run good then after couple secunds working will start to misfire, loop, backfire and making various other sounds finely not will not run anymore Trouble codes: P0128, P0131, P0135, P0300, P0171
2002 Oldsmobile Bravada 4.2L No Start, Hesitation, MIL Lamp on VIN: 1GHDT13S52
Hello everyone. I have this bravada in here with a real intermittent problem. this truck is from another shop who gave up on it. I have never had the truck in a no start problem but cust. states it will not start at times. anyway scanned for codes and found a ... Trouble codes: U1000, P1683, P0116
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F92
Customer has had this check engine lite on for about a year and a half. Has a code of p0420 and says catalyst system efficience below threshold. Customer to it to local autozone and the told him it needed a convertor. He took car to monroe muffler where they i... Trouble codes: P0420

Fixes & Summaries for GM
Fix/Summary Answers
1997 Chevrolet Blazer 4.3L Abs VIN: 1GNCS13WXV
Thanks to all that replied, and a special thanks to Alex & Robert.A replacement VSS was all it took, but for a hard-to-see reason. The last part of Alex's reply mentioned that the VSS bracket can be destorted if an aftermarket sensor is'nt factory equipped wit...
1999 Chevrolet Tahoe LS 5.7L MIL Lamp on VIN: 1GNEK13RXJ
I eventually replaced the entire injection unit with an updated version from GM. I did so because I felt there was nothing else that I hadn't done or checked and that included checking each and every injector for leaks and there were none. I am not sure what p... Trouble codes: P0175, P0172.
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GNDT13W51
Sorry it's taken so long to close, I had to get some money makers in for a little while before returning to this Blazer. I decided to try slotting the distributor to get cam retard right but just for good measure got an ACDelco cap as recommended by many of y... Trouble codes: P0300.
2003 Chevrolet Silverado 1500 5.3L 2-3,3-2,4th? VIN: 2GCEK19TX3
after getting it back from the dealer i pulled unit replace burnt 3-4 clutches and band and installed it with a different rebuilt convertor.well i talked to the customer today,he has over 1000 miles on it and he says the truck never worked better,so i guess it...
2004 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13S94
We found the problem late last night. Thank you for all who replied. We found that the Acdelco truck connector we installed was not making a good connection. Just to see if it worked we installed a junk yard pigtail and all is well. Note to self dont assum... Trouble codes: P0526.
2005 Chevrolet Impala LS 3.8L Stall, Hard start VIN: 2G1WF52K05
Thanks for all the help. We replaced the crank sensor, and also found the fuel pressure dropping intermittently. Checked and found the pressure regulator leaking to the vacuum side. Replaced regulator and have not since had the problem reoccur, the customer h...
1995 GMC C3500 Sierra SL 6.5L Stall VIN: 1GDKC34F9S
Thanks everyone for the replies. I changed the module and it runs like a new truck. I endeed up mounting the new one back on the pump. None of my suppliers had any info on a relocation kit and since there was a core on the old one I just swaped them. Was j... Trouble codes: 35 (Injection pulse width error response time too short), 36 (Injection pulse width error response time too long), 93 (cylinder balance error).
1997 GMC C2500 Sierra SL 5.7L Power Steering
Installed a Cardone pump and everything seems fine. A bit noisy, but I guess thats typical with those pumps. From now on I'll stay away from the Delco pumps. Thank you very much for everyones input, this was my first post on here and its nice to see I wasnt tr...
2001 GMC Sonoma SL 4.3L No Start VIN: 1GTCS19W41
Sorry everyone, it ended up being a coil and fuel pump again.
2002 GMC Envoy SLE 4.2L Noise VIN: 1GKDT13SX2
well its strange ... the customer has never heard this drumming noise .. and i can say that i havent heard it before .. but i have road tested several vehicles since ..and they all do it with the rear windows open .. that was the standard reply from all iatn ...
1993 Pontiac Grand Prix GTP 3.4L No Start, Cuts out, Misfire VIN: 1G2WP14X3P
Hello everyone, sorry for the delay in closing. I did not figure this one out, the customers wallet would not let me go any further. I would have liked to solve this one, but time and money wouldn,t let that happen. Thanks for all the good info, Korey Trouble codes: 42 (EST Circuit).
2005 Pontiac Vibe 1.8L MIL Lamp on, Hard shifting VIN: 5Y2SL63815
2007 Pontiac G6 3.5L compressor VIN: 1G2ZG58N97
Thanks for all the replys. This one had me stumped, one time it cooled ok then it quit. The pressure readings were different every time i checked. I replaced the expansion valve, flushed system, and installed a new compressor. Ac now has normal pressure and co...
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next