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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 22, 2008
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Open Help Requests for GM
Help Request Answers
1990 Buick LeSabre Limited 3.8L Poor Idle Quality, Misfire VIN: 1G4HR54CXL
Vehicle came in with a light misfire stopped in gear that would grow in to a major misfire under load on the highway. It would misfire hot and cold. After replacement of secondary ignition and fuel system service the engine runs good cold. After about 2-3 mile...
1996 Cadillac Seville STS 4.6L Electrical VIN: 1G6KY5292T
This vehicle came in to our shop with a no start condition originally and was found to have a shorted battery, replaced battery still no start. Starter found to be faulty, replaced the starter, all ok. Vehicle came back 2 days later with a dead battery. After ...
1991 Chevrolet Camaro Z28 5.7L Poor Idle Quality VIN: 1G1FP2382M
Hello GM tech's, This one we have gone through the ringer:-( When this car is cold it runs great for about 5 minutes till it gets hot. Every thing looks normal on the data readout. It idles rough, engine shakes a little and is rough to about 1500 RPM and then ...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 1GNFK16R7X
vehicle came in on the hook crank no start found no fuel pressure and blown ecm 1 fuse replaced fuel pump and ecm 1 fuse ac delco with connector still blows ecm 1 fuse evry time oyu turn ignition in to on possition, after we replaced ecm and flashed it , still...
2001 Chevrolet Express 3500 5.7L Fuel guage VIN: 1GCHG39R81
Hello to all technicians worldwide.We have a 2001 Chevy G-3500 van that has an inoperative fuel guage.The vehicle originally came in for a no-start/hard start condition.We diagnosed it as a bad fuel pump and proceeded to replace the unit.It started and ran wel...
2005 Chevrolet Silverado 2500 HD 6.6L Unknown VIN: 1GCHK23285
Hi guys, need your help again. I have an 05 Duramax that sets a 872 code imediately after putting it in any forward gear. It then defaults to fourth gear and sets the code. I can clear the code and run the vehicle in reverse and the code will never set. I have...
2005 Chevrolet Express 3500 6.0L cluch command
Van came in last night not cycleing, the psi was high around 150psi cause it came from airport. no compessor clutch. wiggled low psi switch & it kicked on & blew cold.next morning intermitant cluch so try low psi switch.then it got wierd, cluch had a mind of i...
2006 Chevrolet Silverado 2500 HD LT 6.0L MIL Lamp on, REDUCED POWER VIN: 1GCHK23U76
this vehicle came in with an intermittent problem. customer states service engine soon light comes on and reduced power message displayed and engine will not respond to pedal movement. stores codes p1516 p0053 p0054 p0059 p0060 everytime truck comes in. this h... Trouble codes: P1516 (throttle actuator control module), P0053 (ho2s heater resistance b1s1), P0054 (ho2s heater resistance b1s2), P0059 (ho2s heater resistance b2s1), P0060 (ho2s heater resistance b2s2)
2008 Chevrolet Express 2500 LS 6.0L Accessories VIN: 1GAGG25K48
I am concerned that I can't find info on installing t1 towing harness (4pin)to this truck. GM has no info at all available. Can I just plug it in and have it work or do I need to worry about blowing a module...the trailer has no electric brakes just brake, run...
2008 Chevrolet Aveo LS 1.6L Tire Sensor VIN: KL1TD66668
This vehicle came in with a tire pressure light on while engine is running, scanned system for codes and found C0550 "ECU Malfunction" we then checked all power's and grounds and replaced the TPM ECU, then the light stayed off for 15 miles and then the vehicle...
1995 GMC K3500 Sierra SL 6.5L Reservoir VIN: 1GDHK33F5S
We received a report of a truck losing coolant out the reservoir and that the truck was not overheating. We instructed the operator to stop driving the truck and we had it towed to the shop. At the time, we could not confirm their complaint. We then replaced t...
2003 GMC Yukon XL 2500 SLE 6.0L Misfire, MIL Lamp on VIN: 3GKGK26U23
This vehicle missfires and has bad detonation when towing in hot weather. The only fault present was a P0353. I replaced #3 ignition coil and it seemed to correct the problem, however it came back when towing in hot conditions. I checked the IC signal when cra... Trouble codes: P0353 (Malfunction in primary ignition circuit.)
1991 Oldsmobile Cutlass Calais S 2.3L Cuts out VIN: 1G3NF14A5M
While driving the vehicle it will cut out like the ingnition system was shut down completely, just for a little bit. I have the best luck with the engine about 2200 rpms to get it to do it. I had an esc module code in there, I did a secondary scope while it w... Trouble codes: 43 (esc module or circuit failure)
1993 Oldsmobile Cutlass Ciera 3.3L Unknown VIN: 1G3AG55N3P
This olds came in with a big oil leak out the front crank seal and making a scraping noise from front of engine. We replaced the seal and the leak quit, but the noise was still there. Removed the timing cover to look inside. The only thing we can find is that ...
2000 Pontiac Grand Prix GTP 3.8L Hesitation, Cuts out, Stall VIN: 1G2WR521XY
im scratching my head on this one no codes only seems to fail after hot but monitered temp sensor and guage in dash readings were normal for driving conditions acts like it loses ignition by the way fuel press goes up when it quits hunts for idle after fail li...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Buick Regal T-Type 3.8L master cyl VIN: 1G4GK4775G
So far we got credit from the company that we got this rebuilt powermaster unit from for it being defective, but thats all we got from them. They don't want anything to do with this system anymore and won't build one again. I did call a few places that I hea...
1989 Buick Electra Park Avenue 3.8L No Start, Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1G4CW54C4K
We replaced the PROM and were able to communicate with the computer again.The car drove well other than being way down on power at WOT.We checked the fuel pressure and found it was dropping to 10 psi intermittently,replaced the pump and all is well,thanks for ... Trouble codes: 41 (cam sensor), 42 (electronic spark timing).
1964 Chevrolet truck 396CID lights
John [...] faxed me the info I needed, thanks. Several mentioned aftermarket wiring harness and that would have been a better route, but they guy basically tried to make his own harness and got in over his head. Just wanted the OEM diagram to make the pro...
1998 Chevrolet Astro 4.3L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1GCM19W1W1
Thanks to everyone's input. Most all responses agreed fuel pressure was too low for a poppet type injection system. Replaced customer's "el-cheapo" unit with a GM and "bingo" problem solved. Thanks to everyone. IATN is one of my most valuable tools in the shop...
1999 Chevrolet Malibu 2.4L battery draw VIN: 1G1ND52T8X
I tried disconnecting modules, fuse, relays, & ignition switch to make ecm go to sleep. I even though the data wire coming from the aldl connector might be picking up stray signals seeing it was looped up around everything. I ended up putting in a relay on the...
2000 Chevrolet S10 2.2L Misfire VIN: 1GCCS1456Y
First thanks for the help guys. Removed the head and the #2 cyc had a burned valve. The reason we did not think the valves were the problem is that 8/19/06 30,[...] ago, we did a head gasket and had the valves done at that time. The edge was just not sealin... Trouble codes: P0302.
1993 GMC K1500 Suburban SLE 5.7L a/c controller VIN: 1GKFK16K0P
Thanks for all the help , I cleaned the wiring connector terminals on the back of the a/c controller and the customer took the vehicle and says all's well works good. The suggested helps said to check all a/c sensor connections and battery terminals for corros...
2004 GMC C5500 Topkick C5C042 6.6L transmission VIN: 1GDE5C1264
sent to dealer they said it was the turbo. no fault with trans. the vans on the turbo where so badly carboined up the it was not moving thank for and the input to all of you
2004 Pontiac Grand Am GT 3.4L daytime running lights VIN: 1G2NW52E5Y
the high beam monitor wire circuit 1200 was open in fuse/junction block (under hood) and it also had a bad buld using excesive voltage. the reason for the flicker of the relay is because the low beam monitor shows about 6 volts and the high beam was showing .2...
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