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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 12, 2010
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Open Help Requests for GM
Help Request Answers
1995 Cadillac Eldorado 4.6L power steering VIN: 1G6EL12Y8S
Posting this for the shop. Customer replaced PS pump, then came to our shop because the seal blew out the top of rack and filled the drivers side floor. Our tech replaced the rack, and had the hose blow off at PS cooler. Pressure gauge installed at pressure ...
1988 Chevrolet P30 7.4L Radiator VIN: 1GBKP37W4J
HELP!!! My own motor home, of course. Coming home from the York US 30 reuinon yesterday, rad springs a leak. Of course, this coming weekend is Super Chevy at Maple grove, our favorite race. We have gotten the ac cond, front fans, bunch of wires etc, out of the...
1995 Chevrolet Lumina 3.1L starter VIN: 2G1WL52M7S
Sorry in advance but I do very little domestic work. This fine gem of an auto was towed into our shop with a no crank condition. I insert the key and turn to the KOEO position and the security lamp flashes. Turn the key to start and nothing. Spoke with the cus...
1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R0T
Vehicle came to my shop with 2 lean codes. I clear codes take on a 5 mile road test and right back soon. I have tried to clear the fuel trim and I can get it to go to sero. when i clear it goes to 128. Is that were it usualy starts? I recored freeze frame data... Trouble codes: P0171 (Fuel sys too lean b1), P0174 (Fuel sys too lean b2)
1999 Chevrolet Tahoe LT 5.7L dome lamp VIN: 1GNEK13R7X
Ok Gentlemen...and possibly ladies...I have this 99 Tahoe that the dome lamps stay on. If I start the vehicle, the lights will go off after pressing the dome override button. If I press the dome override back on, then the lights come back on with all doors clo...
2006 Chevrolet Cobalt LS 2.2L left front door latch VIN: 1G1AL55F66
HELP! Left front door will not open. Handles and linkages intact. Lock actuators (inside, outside and power) and linkages intact and "working". Feels just like the right side which works. Can see all linkages and latch parts that are moved by the linkages (inc...
2008 Chevrolet Silverado 1500 LT 5.3L Unknown VIN: 2GCEK13388
Have this truck in customer complaint no cold air coming out verified compressor not engaged the a/c button flashes then goes off compressor never engages.. Hooked up snap on modis to check bcm for any codes no codes found attemped to reconnect to bcm to look ...
1998 GMC Savana 1500 5.0L Poor Idle Quality VIN: 1GDFG15M8W
This vehicle has a boat load of problems. Most of which i have corrected except for this high idle issue. This van came in on the wrecker, wouldnt idle to save its life. it was leaking coolant, power steering fluid, a/c didnt work and was stumbling everywhere... Trouble codes: P1509 (Idle Air Control System High RPM)
2006 GMC HUMMER 3 3.5L Hesitation, Surge VIN: 5GTDN13696
This car came in with the customer complaining about an intermitent shake in the engine. After we clear out the code the shake and engine would run normal. After a few start and turn off the engine would start shaking again with codes 1516, 2101, 1682, Trouble codes: 1516 (Tac mpdule), 2101 (Tac motor), 1682 (Ignition fault)
2007 GMC W4500 Forward W4S042 6.0L MIL Lamp on VIN: 4KDC4B1U67
Truck came in with SESL on, scanned for codes. Code P0894 is present, code description is "SEE SERVICE MANUAL" which I of course did through All-data. No such code exists in the code library, nor does a call to All-data's library of information reveal any code... Trouble codes: P0894
2000 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NG52T3Y
I have done quite a few GM evap repairsa but this car is kcking my butt. No leaks during smoke test. Not quite sure what to look for when doing the purge/seal test. Tis 4cyl dosent habe manifold vaccum to purge valve (its a ported vaccum source) If you bring t... Trouble codes: P0442
2004 Pontiac Grand Am SE 2.2L No start VIN: 1G2NE52F94
Car wont start "not theft system problem" has no spark or injector pulse.crank sensor test ok,and have rpm's on scanner.tech 2 shows no cmp or sync signal put new coil with module on with no luck.dont think car has a cam sensor.timing chain ok.almost seems lik...

Fixes & Summaries for GM
Fix/Summary Answers
1964 Buick Riviera 6.6L TXV Valve
The Buick A/C is cooling nicely. The TXV valve referred to in the help request is the correct valve for this application. What threw me off was the way the original was installed. The equalizer tube on the original had been routed through the top of the evap c...
1995 Chevrolet C2500 Suburban 7.4L compresser VIN: 1GKGC26N35
1997 Chevrolet Blazer 4.3L fuel guage VIN: IGNDT13W1V
I talked to the owner this am(it's been a week) and he said all was well. So, for us, it appears cleaning and tightening the contacts at the buffer module did the trick. There were a few who suggested a bad sender. But with the scan data showing steady consist...
1999 Chevrolet S10 2.2L Accessories VIN: 4678235564
sorry for takeing so long to get back,sent truck to dealer they said it needed a computer,and ashort in the wireing harness thanks for all your help,cant win them all.
1999 Chevrolet C2500 5.7L Poor Idle Quality, Surge VIN: 1GCGK23R2X
Thank you for all the help on this one. We were able to reprogram our flash PCM which took care of all the idle problems. Calld the customer back a week later and he is very pleased with the repair. Once again thank you for all your help.
2001 Chevrolet Monte Carlo SS 3.8L stereo VIN: 2G1WX15K51
unfortunately customer pulled the plug on this repair. most replies said to check power and ground to the amp (which i did and it was good), to replace radio (turns out customer had a replacement radio and it did not help), or to check wire harness that runs ...
2003 Chevrolet Silverado 3500 LT 6.6L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCJK33163
Thanks to all who replied. Any and all information is always a help when working on a problem vehicle. We used our diesel opacity meter to measure the difference in emissions when we cut out the suspect #2 injector. It was huge. After reluctantly replacing...
2004 Chevrolet Suburban 1500 LS 5.3L Rear speed sensor VIN: 3GNFK16Z34
Well everyone, this Chevy is fixed.Been good for 10 days with a vacation trip included. VSS signal was dropping out here and there, followed harness up the trans and found the rubbed thru wire. Ran 2 new twisted wires from PCM to VSS and routed a little better...
2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GCHC23U55
Thanks for all the help. Most reply's were that there was a vacume leak, and I suspected this but couldn't find one. One suggestion was there may have been a intake crack leaking into the crankcase which seemed like a great idea but I found no vacume there. AF... Trouble codes: P0171, P0174.
1999 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX52KXH
Thanks to all the replies. I did replace the crank sensor as many suggested and sent the car home, stalled the next day. The reman AC DELCO MAF sensor I had just installed was the root cause of the problem. I replaced it with a NEW AC DELCO MAF SENSOR. The car...
2001 Pontiac Aztek 3.4L Cooling Fans Inop VIN: 3G7DB03E71
Thanks for every ones help however vehicle is not fixed recommended replacing PCM with AC Delco not after market. Engine coolant sensor circuit is reading hot and the PCM is not turning the fans on.
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