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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 4, 2009
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Open Help Requests for GM
Help Request Answers
1990 Buick LeSabre Limited 3.8L Idles too fast VIN: 1G4HR54C7L
Car came in last week complaining of no start. But vehicle was driven to shop. Test drove off and on all day but was not able to duplicate no start. Noticed idle would race fast when started cold but was not concerned as did not suspect this was tied in to no ...
1999 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K4X
hi guys, this buick is killing me. car came in with new tune up parts and a horrendous misfire under load. it idles great. fuel trims look good. i tried shorting cylinders under a load and all 6 seem to drop. the kicker is, i've got no codes and the misfire co...
1993 Cadillac Seville STS 4.6L no mil VIN: 1G6KY5296P
this cadillacs mil light will not come on in the koeo position. will come on and go off when starting it and also in diagnostic mode or when a code is induced. i have turned key on and then off and waited as much as two to three minutes to make sure computers ...
1995 Cadillac Eldorado ETC 4.6L Poor Idle Quality VIN: 1G6ET1296S
We are replacing the idle speed control actuator, new Delco. Would like to know the proper adjustment procedure for the contact stop for the new actuator (New actuator comes with new adjustable stop, but not installed) I have found the procedure for TP sensor/...
1969 Chevrolet C-10 350CID Starter & Flywheel VIN: CE249S8281
My boss bought this truck a couple of years ago for resale.A previouse employee replaced the starter and flywheel because the teeth were ground to death. Still had problems starting, so the truck was parked in storage. Fast forward a year, he pulled the truck ...
1998 Chevrolet Blazer 4.3L Excessive Emissions, Hesitation, Cuts out, Stall VIN: 1GNCS13W3W
This blazer had an engine installed then was brought to us due to the fact that it would idle then stall. When it stalls short term fuel trims max out at 50 long term trims are at 25 b1s1 is dead in the water and the other [...] seem to be responding ive tr...
2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: IGND513525
Customer brought truck in with idle problem. When the truck gets hot it will surge for a few mins. and cut off. With scan tool hooked up when it acts up engine load goes to 100%, the map readings seem fine. Do not know if maybe no throttle responce from comput...
1998 GMC Savana 1500 5.7L Charging VIN: 1GDFG1SBSW
hi everyone.i have a 1998 gmc savana van thats a conversion van, converted by the explorer van co. it came in with a dead battery. charged battery and tested fine. checked the charging system and the alternator did not pass,and the volt meter on the dash was a...
2006 GMC Sierra 2500 HD SLT 6.6L Glow Plug VIN: 1GTHK23DX6
Truck was brought to me with 1-8 glow plug control codes as well as p160c, Glow Plug control module not programmed. I replaced the GPCM with a reman unit, replaced all 8 glow plugs. Now I only have the p160c code. It will not go away. I have copied the injecto...
2000 Saturn SC2 1.9L MIL Lamp on VIN: 1G8ZY1279Y
This vehicle came in with a single P0410 code and the same code pending we tested the vehicle based on the flow chart which lead us to find that the PCM was not sending the ground signal to the AIR pump relay (elect. AIR pump)we recommended replacement of the ... Trouble codes: P0410 (A.I.R. Failure)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Seville STS 4.6L battery VIN: 1G6KY5297V
Out of all the replies the vast majority informed me to do a parasitic draw test and remove fuses. I had assumed everyone knew that I had already done that prior to posting as this is the first basic test to do. There were some good replies which essentially...
2004 Cadillac CTS 3.6L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1CGDM57744
I shared info to the customer about too much fuel when refilling. I also informed him that I was leaning toward replacing the charcoal canister. The one thing he shared with me that seems to have made a difference on his end is he leaves the vehicle running ... Trouble codes: P2188, P2190.
1994 Chevrolet Corsica 2.2L No Start, Stall, MIL Lamp on VIN: 1G1LD5546R
Hi Folks, This one is fixed after much help from the 15 techs who responded. The 5 volt feed from the ecm was grounded. We never found exactly where but it had to be between the ecm and a spot 6 inches from the firewall. I could get a 4.8 volt reading once ... Trouble codes: 34 (map sensor), 28 (quad driver).
1999 Chevrolet Blazer 4.3L Transfer Case
Thank-you for all the feedback. Each suggestion had been noted and checked. As I dug into the problem more there were a couple of key issues. Two of the pins on the TCCM, as usual were slightly corroded due to water intrusion, but I had also found that the ...
2000 Chevrolet Astro 4.3L Hydroboost VIN: 1GNEL19W5Y
Thanks for all replies. I rechecked the hydroboost for reserve boost and that was ok. I also checked the belt and tensioner to ensure the belt was not slipping, which was good. Jon from California had it right. The power steering pump actually failed the n...
2002 Chevrolet Tracker LT 2.5L a/c blower,abs light VIN: 2CNBJ63492
thanks for all three replies. apparently there was no pattern failure on this vehicle.the problem turned out to be a bare wire under the hood near the blower relay. the harness was rubbing on the strut tower support bar,and shorted the a/c blower circuit. you ...
2003 Chevrolet Silverado 1500 5.3L High beam light on dash VIN: 2GCEC19T33
Ok this ones fixed. These clusters are junk according to the chevy techs i talked too. I checked all the hard to reach grounds, i pulled all the headlight bulbs, and the i disconnected the BCM and cheked the connection at the cluster with no change. Sent to de...
2004 Chevrolet Express 3500 6.0L Cooling Systems VIN: 1GBJG31U64
thanks for all the help ,the heating problem was a plastic bag between the radiator and condensor how it got thre i dont know.we did a complete tune up code po300 did not come back as far as we know.thanks alot.i should of checked this one out beter before i w...
2006 Chevrolet Silverado 1500 LS 5.3L left temp actuator VIN: 1GCEC19X36
Ok guys this is what happened. I ended up having a intermitant ground on the blue wire which would pull down my 5v supply to the actuator causing it to return to default position (hot). This is the 3rd 2006+ GM truck product I have had a problem with chaffed ...
1996 Pontiac Grand Am SE 2.4L No Start, No MIL, No PCM Commu VIN: 1G2NE52T3T
The working situation of this car is very unique. I don't have the lexuray of working on this vehicle at my leasure. I'm a mobile tech with limited access to the vehicle. I appreciate everyone's input. Thay were all great help, some I had already tried and ot...
1995 Saturn SC2 1.9L engine ignition VIN: 1G82ZH1274
Sorry Everyone who replied . I can not get the customer to bring the car back to do anything to it .
2000 Saturn LW2 3.0L MIL Lamp on, Fuel Gauge & AC inop VIN: 1G8JW82R8Y
Hi, and thanks to all that responded. The problem was a bad internal ground in the PCM. I just externally grounded the affected circuits and everything came back to life with no codes. Customer has been driving car for 2 weeks and no problem. Trouble codes: P1283 (APP sensor 2 circuit high voltage), P0533 (A/C pressure sensor high voltage), P0453 (Evap tank sensor high voltage).
2003 Saturn Vue 2.2L Hard Start VIN: 5GZCZ23D53
Hello everyone and thanks for the help on this one. This system has a gas tank that straddles the driveshaft or exhaust on the car so has two "wells", one pump, pumps from the one well, over to the main fuel pump well. We were advised that these can have pro...
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