× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 21, 2006
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
1990 Cadillac DeVille 4.5L Excessive Emissions, No Start VIN: 1G6CD5330L
Hello and happy holidays fellow techs. I have this problem child cadillac we inherited from another local shop. They tried a pcm which didn't fix it then towed it to us (it would barely run and was not drivable). I checked spark which is good then fuel pressur...
1995 Cadillac DeVille 4.9L ventilation VIN: 1G6KD52B4S
We have a 1995 Cadillac in our shop with a concern of cool/cold air out of the left vents on floor, face, and defrost,,, but it has warm/hot air on all the right side vents. Vehicle has auto air. There are no codes stored in a/c ecu. We are not very familiar w...
1987 Chevrolet S10 Blazer 2.8L 3 -4 VIN: 1GKCS18R9H
hello group... seasons greetings i bought this jimmy wif low miles on crate mmotor,but only had 1st and 2nd gear. i opened it up and it had worn clutches,3rd n 4th were gone. so i put it back together and it werked ok for obout 2 weeks...upon acceleration it s...
1997 Chevrolet Lumina 3.1L heating system VIN: 2G1WL52M7V
Read the related history, this vehicle is coming in for the same problem it's had the past two years. Both times another shop performed services to correct the loss of heat and it was "ok" for the winter. It is now at that point again where the guage is fluctu...
1998 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEK19R9W
Original complaint was check engine light on with P0420 (TWC system low effciency below level bank 1). No other codes stored or pending. Performed diagnostic flow chart and confirmed bad catalyst (originial). Replaced converter and all oxygen sensors. Drove ve... Trouble codes: P0153 (Slow Response Bank 2 Sensor 1), P0133 (Slow Response Bank 1 Sensor 1)
1999 Chevrolet Silverado 1500 4.8L No Start VIN: 2GCEK19V6X
this truck has a 4.8 engine, not a 5.0, iatn did not show this option when starting this request. the problem with this truck is that it does not have feed to the fuel pump relay from the pcm, so when you key up there is no 2 second pulse, we check the wiring ...
2002 Chevrolet Malibu 3.1L Righ front wheel abs VIN: 1G1ND52J22
ABS guy, nice trouble here. Car come for intermittend abs light and ABS not working when light is on.Pull out history code C1222, C1226, C1233, ABS bearing-sensor change before at GM dealer 2 time. I change right connector et wiring for right front wheel an ch...
2002 Chevrolet Silverado 1500 5.3L transfercase VIN: 2GCEK19T72
This one is getting very expensive. Here's the deal.Transfer case won't shift into different ranges(auto push button)It first had a c0387(can't complete shift)So having a good switch handy,it was installed and no change. Removed encoder motor and manually shif...
2002 Chevrolet Avalanche 1500 5.3L Misfire, idle VIN: 3GNEK13T82
solid number 8 misfire at idle occasionally underload passes all tests... swapped injectors coils plugs etc. saw small sign of coolant on intake valve after intake removed. Cranking compression ok intake ok... Trouble codes: P0300
2005 Chevrolet Impala 3.4L Brakes VIN: 2G1WF55EX5
We have a Chevy impala here that is giving us a hard time. The car came in for a "soft" brake pedal which we could not duplicate. It needed all 4 Calipers pads and rotors due to uneven wear and undersized rotors. Now the car doesnt seem to have the stopping po...
2005 GMC Sierra 1500 5.3L MIL Lamp on
I have looked all over to find a TSB or info stating that aftermarket engine heater will cause a MIL on for coolant sensor. Our shop has installed over 5000 block heaters in last 3 yrs on a City contract to lower Emmisions on cold days. In the last month one o...
1999 Pontiac Grand Prix GT 3.8L Hesitation, Surge VIN: 1G2WP52K5X
customer complaint of engine surge on light acceleration or going up grade. no codes set. replaced plugs, wires, fuel filter (pressure ok). i cleaned the maf and replaced the tps - no change. i flushed the injectors - seemed better. car returned 10,000 km late...
2000 Saturn LS1 2.2L dash lights,security VIN: 1G8JU52F5Y
Hi techs, this vehicle has an intermittent problem with stalling,no start.The interior dome light and dash warning lights will flicker as well as the security lamp will illuminate or flash when this no start or stall occurs. have checked grounds and connection...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Catera 3.0L heat VIN: W06VR52R7V
well this one gave us a break, after leaving and letting sit over night. we came in the following morning and now had heat back to drivers side but still no function to passenger side. must have been a stubborn air pocket. removed passenger side blend door mot...
1995 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GCDT14W4S
Hey guys thanks for all the help. Just to say to the sceptics out there I have been a tech for 30 years, and I ordered a new cfi unit right after I posted this help request. I apoligize for crying poor mouth looking for a cheap easy way out. We are a very prof... Trouble codes: P0305 (CYL 5 Misfire).
1998 Chevrolet Venture 3.4L unknown VIN: 1GNDXO3E4W
Thanks for the help guys! The problem was in the PCM. I sent it away for testing and the injector output circuit was defective. Replaced PCM with a rebuilt - reprogrammed unit and van works fine.
2003 Chevrolet Silverado 2500 6.0L transfer case VIN: 1GCHK23U03
Good afternoon everyone. I recieved several replies about 'waking up' the TCCM, which I had done several times with no luck. I checked the TSB's mentioned in the replies and they didn't pertain to this truck. It had to go to the dealer to be reflashed and now ...
2004 Chevrolet Aveo 1.6L Electronic VIN: KL1TD52694
Thanks to all who responded to help solve this problem. The codes p300, and p1781 were found after a second test drive. The resolve to this was simple when chainging engines in this car crank sensor needs recalibrated.What I did not know was when this car was ...
2005 Chevrolet Impala LS 3.8L tire pressure monitor VIN: 2G1WH55K15
Thanks again for all the input. Customer hasn't returned. Since this is a lease car it probably won't be back. I wish I had been able to do the repair and have a solid answer. The following is a summary of the replies I recieved. Check for equal tire circumfer...
1999 GMC Sonoma SLE 4.3L noises VIN: 1GTDT19X3X
hi guys sorry i really don't have much to add, i did check for lines hitting any part of the body and while i can't see every part of the lines i'm fairly certain that there not hitting. pcv valve is not the problem. thanks for all the help.
1997 Pontiac Trans Sport 3.4L air flow out vents VIN: 1GMDX03E2V
The low air flow out i/p vents with heat turned up must be normal because every transport i've seen since is the same way
1998 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WP5218W
As usual, IATN comes through. I dont ask for help as often as I offer, so I was glad to get such a great responce. First relply hit the nail on the head. There is a resistor in the circuit for the fuel pressure control side of the 2 relay system on this car. M...
2001 Pontiac Aztek 3.4L Poor Idle Quality, VIN: 3G7DA03E81
Well after much hair pulling we replaced the BCM. On the Tech2 the data showed that the BCM was NOT calling for a higher idle. Three weeks later and the vehicle owner said all is well.
2002 Saturn L200 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G8JU54F02
upon dissassembly of the timing chain area of the engine, i found that the automatic tensioner had broken apart. this allowed the exhaust cam to advance by a couple of teeth. the coolant issue actually turned out to be cylinder head porossity leaking coolant i... Trouble codes: P0300 (random misfire), P0108 (map high), P0107 (map low), P1599 (engine stall).
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next