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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 2, 2010
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Buick Riviera 3.8L speedometer VIN: 1G4G567143
at times with engine running or not usually first start of the day but only does it once every week or so the speedo will bounce and the Transmission solenoids will shift. If you are driving acts like the trans is shot shifts in and out. If you turn off and o...
2005 Buick LeSabre Limited 3.8L electronic temp control VIN: 1G4HR54K05
To all who out there please help with this problem, it seems like something is wrong with the electronic temp control unit but we have no idea how to check this component, even with the temp turn all the way to max high which is 92 Degree F the compressor is s...
2000 Cadillac Seville STS 4.6L windows VIN: KNJPT06H5P
Lost all power to windows, locks power mirrors. Roof works. Checked the fuse panel all fuses good no sign corrosion. Suspect problem with ground (multiple systems). There is no water on the passenger floor (becm). There is also no illumination to the switches ...
1995 Chevrolet Blazer 4.3L Hesitation, Surge VIN: 1GNDT13W6S
Hi everyone and thank you for reading this. I am getting my butt kicked on this one. Idles ok, runs good full throttle but runs like crap at cruising speeds. almost undriveable. It runs like the distributor is a tooth off. we have reset the distributor twice t... Trouble codes: P1345
1999 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 3GNFK16R8X
Vehicle came in from another shop running lean, Found fuel pressure below specs, Other shop had put cheap fuel pump in, Customer took vehicle back to them and they put in a/c delco fuel pump. Runs great now but PO420 code keeps returning, Converter back pressu... Trouble codes: P0420
1999 Chevrolet Express 2500 5.7L brakes VIN: 1GCGG29R7X
could this be the master or possibly the prop valve , vehicle has hydroboost found no info on this system
2003 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23163
Intermittent P1404 closed EGR performance fault. Light reoccurring more frequently now. Vacuum pump little noisy, but provided consistent 25" of vacuum. Tested vent solenoid and throttle solenoids, ok. Inspected all vacuum hoses, ok. Replaced EGR valve. Light ... Trouble codes: P1404
2004 GMC Envoy XL SLT 4.2L Front wheel drive VIN: 1GKET16S14
About 6 months ago we changed the shift fork and return spring in the 4*4 intermediate shift bearing housing because of inoperative front wheel drive. The Envoy went out and all was well. This week the car was towed in because the customer tried to back out t...
2005 GMC Sierra 2500 HD SLT 6.0L MIL Lamp on VIN: 1GTHK23U15
Hi everybody. I have this GMC truck that keeps turning on the MIL light for a knock sensor code ( P0332 ), I researched IATN history for this code and found 5 responses mostly pertaining to the TSB for water intrusion at the rear sensor. We removed the intake ... Trouble codes: P0332 (Knock sensor two voltage low/shorted)
1999 Pontiac Sunfire SE 2.2L Timing chain VIN: 1G2JB524XX
We had this vehicle towed in 4 months ago for a no start. Found a broken timing chain. Made the repair and it ran fine. After 4 months its towed in again for the same condition. Now R&R and another new chain and gear set it runs fine. My question is... has any...
2002 Pontiac Grand Am SE 3.4L Hesitation, Surge, Cuts out, Misfire VIN: 1G2NW52E62
running out of ideas. car hesitates and feels like it has low power under medium accelerate. under full throttle the car runs fine and it idles perfect. Unplug the EGR and the car runs perfect. i have scope the both crank sensors and cam. scope ignition also, ...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Park Avenue 3.8L engine VIN: 11G4CW54K8
Replaced intake gaskets and plenum ,flushed system and its fixed.
1990 Cadillac DeVille 4.5L Speedo VIN: 1G6CD5330L
Thank you very much It is a cluster problem, checked signal at connector 2 pin 11 and has good 12 volt square wave signal from the pcm to the cluster. Signal did not go way when the speedo dropped out. Customer decided not to repair at this time.
1997 Cadillac DeVille 4.6L Instrument Cluster VIN: 1G6KD54Y1V
Thanks for the replies, I used Auto Xpress Tech, got the cluster back, installed, worked good, very reasonable price...
1995 Chevrolet K1500 5.7L No Start VIN: 2GCEK19KXS
After banging my head on the wall for a few hours and checking and rechecking my repairs and wiring I decided to cut off the new aftermarket ignition module harness and reinstall the old broken one and it fired right up. I did have a square waveform at the PC...
1998 Chevrolet K1500 Silverado 5.7L Poor Idle Quality, no power VIN: 2GCEK19R6W
Well thank you to all who replied. Sorry about the delay for closing this post. Well, I tried the donor MAF with no results. So yesterday I adjusted the valves 1\4 turn past clicking. The idle was smooth right away. All of the valves where 3\4 to 1 turn too ti...
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
Thanks to all for the replies. We figured out what was going on yesterday, and then this morning an e-mail from Junior [...] was right on. We found the crank sensor signal to be the issue, when we pulled the old sensor noticed the reluctor had been makin... Trouble codes: P0304, P0300.
2003 Chevrolet S10 2.2L head light VIN: 1GCCS14113
I finally found the problem at the main fuse box. The contacts at the bottom of the fuse box is partiallly corroded . After diconnecting all plugs, clean and plug them back tightly, re-test the light system, all is well. This fuse box has three layers in it. I...
2004 Chevrolet Suburban 1500 LS 5.3L very long crank VIN: 3GNFK16Z84
customer pulled truck and took to dealer. was told that a 3rd fuel pump took care of problem. i can't beleive that we got 2 defective a/c delco fuel pumps. thanks for all the help.
2006 Chevrolet Silverado 2500 HD LS 6.0L Brake Pedal VIN: 1GCHK24U16
Customer is going to have us flush power steering system when he comes in for next service. He will let us know from there. Will post more info if it becomes available. Thanks to all who replied!
2007 GMC Sierra 2500 HD Classic SL 6.0L Cuts out, Stall VIN: 1GTHC29U67
This truck is fixed, I think. Here's what happened. The first post I got said to unplug the front O2 sensors and watch the injector pulse width, which I did. Then the symptom changed from leaning out to just dying after it ran for about 2 hours in my bay. Plug... Trouble codes: P0452.
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