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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 23, 2015
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Open Help Requests for GM
Help Request Answers
1989 Buick LeSabre Limited 3.8L No Start, Stall VIN: 1G4HR54C6K
Car came in for intermittent stalling. Ran for 3 days, stalled once, like ignition cut off, immediately restarted. No codes. Scoped cam and 3X crank, they are in sync, 24X Ok. Yesterday, it seemed a little lumpy, so I hit the throttle and it died out. Hasn't r...
1995 Buick Riviera 3.8L leak VIN: 1G4GD2219S
fluid leak when very cold out from vent,pushes fluid out of vent tube,I have read the posts about the channel plate gasket being the cause just want to know of any other possibility.never saw this before now.I intend to replace the gasket just don't want to do...
2004 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DM57734
My testing reveals lo ref tan wire to have 2.4v at pcm with everything connected and key on. 5v ref is good.The one main ground to the pcm is good. I am calling this a faulty pcm, any other thoughts? Trouble codes: P0122, P0222
2005 Cadillac STS 4.6L starter VIN: 1G6DC67A45
No previous history known. Vehicle was driving fine. all of a sudden vehicle died while driving, client was able to restart with no problem. These issues become more frequent but re-starting the car became more difficult. Now vehicle will not start, there are ...
1992 Chevrolet Corvette 5.7L No Start, Stall VIN: 1G1YY23P5N
Hello everyone on iatn. I had this corvette towed in to me a couple of days ago and it was a no start. I had no spark and had no refrence low 8x signal coming out of the opti spark so I replaced the distributor with a reman unit. after that it would start but ...
2000 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1GCEC14WXY
This truck came to us barely running. Missing,chugging,or hesitating. It really wasn't driveable. First I checked fuel pressure. Measured 55 psi. Alldata spec was 60-65 psi. I put in a fuel pump. Pressure rose to 60 psi. The truck would now start but misfire ...
2003 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH55K13
Got this impala that has a p0420 and p0128 for thermostat and cat efficiency. I went ahead and slapped a thermostat in it because it was very quick and easy to do. That brought the temperature back up to specs. My question is the p0420. I didnt look at the o2s... Trouble codes: P0420, P0128 (Coolant thermostat below reg temp)
2004 Chevrolet Silverado 3500 6.6L Poor Idle Quality VIN: 1GCJK39274
Vehicle intermittently has very rough, unstable idle at stops when warm UNTIL increase throttle position by 1% (as monitored on scan tool). No increase in load or engine rpm, just barely touch the throttle pedal & issue clears up. No codes present. Has been el...
2008 Chevrolet Impala LTZ 3.9L Hesitation, Cuts out, Stall VIN: 2G1WS55328
iATN would not accept the VIN for entry, so here it is. [...] Officer took off for pursuit on highway, and when it reached 60mph it flattened out and started to decelerate. They played with the throttle a little and it accelerated again. Sometime... Trouble codes: P0172 (Fuel Trim System Rich)
1986 Pontiac Firebird Trans Am 5.0L charging VIN: 1G2FW87F9G
Had original alternator main battery cable terminal come loose. if I held it tight, car would charge, if I let it go, it would not. so now i have replaced the alt 3 times with same affect. It charges 14.5 at idle no load. start turning on electrical items and ...
1999 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW12E8X
we had this one towed in for blown head gaskets that we had diagnosed a few months ago. since we thought we knew the problem we pushed it in and changed them, car started right up i checked all the fluids and drove it around the block, pulled it back in to dou...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Reatta 3.8L Accessories VIN: 1G4EC11C4J
Here it goes these are little monsters Gene from Kentucky was extremely helpful on this as he is a previous owner to a model with similar electronics and he helped me pin point it to the CRTC its the controller for the CRT screen so my next step is to fix this...
1991 Buick Park Avenue 3.8L Stall VIN: 1G4CW53L6M
Well I installed a oem crank senor gm part # [...] due to one wire having ...
2006 Chevrolet W3500 Tiltmaster W3S042 5.2L Cuts out, MIL Lamp on VIN: J8DB4B1636
well thank god I got it fixed I learned if the balance rates are way high 8.3ma and you can see fuel actually coming out of the fuel limiter valve that that's not the problem it the high pressure pump go figure this one about drove me to dranking but any way t... Trouble codes: P0087, P1093.
2007 Chevrolet Silverado 1500 LTZ 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK19087
I am a little embarrassed about this job because we totally missed that this engine was what Chevy calls an AFM (active fuel management) engine. We pulled TSB #[...] (dated 1/21/15) and description of our problem was on the first page: "SES light, P0300, mi... Trouble codes: P0300 (Random Missfire).
2008 GMC Acadia SLE 3.6L Windshield Wipers VIN: 1GKEV13728
Thanks to everyone for the replies. I found that the wiper arms were loose on the drive pivots. Seemed to be temperature related as they seemed tight in the shop but found that in the morning after sitting outside there was enough looseness to cause some slipp...
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