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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 25, 2010
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Open Help Requests for GM
Help Request Answers
1989 Buick Reatta 3.8L door locks VIN: 1G4EC11C9K
This vehicle has been in numerous times for different problems. This time came in with theft alarm going off. Had to disconnect battery to turn off. Remote did not work. Found defective drivers door lock switch. Replaced that and new battery in remote fob. I n...
1997 Cadillac Eldorado 4.6L Poor Idle Quality VIN: 1G6ET1291V
This car will intermittently idle high 2,500 rpms, seems to be dashpotting. Iac counts are high 150 plus. Scanner shows 1% throttle and not at idle when its acting up. Tps voltage is .53 all the time at idle. This thing is very intermittent may go a month with...
1995 Chevrolet Corsica 3.1L 1-2 Shift VIN: 1G1LD55MXS
Transmission has a harsh 1-2 shift. We flushed trans. and added friction modifier. While flush machine was running, the pressure gauge on the machine was pegged-out. It's a 200 lb. gauge. PCM had a history code 28 stored. Data showed prndl switch to read corre...
1995 Chevrolet Cavalier 2.2L Misfire VIN: 3G1JC1243S
Didn't think anything this straightforward could stump me after 40 years of wrenching. Guess I was wrong. Thanks in advance Jim
2000 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19W1Y
This van came to us with a rough idle and MIL on. Misfire counters showed cyls. 3 & 5 (Bank 1)at idle. Misfires stop at 1500 rpm. Misfire counters go to zero.(See repair and test history). Misfire still present after CSFI Unit and other repairs. Valve springs,... Trouble codes: P0300 (Random Misfire)
2001 Chevrolet Venture LS 3.4L Starting VIN: 1GNDX03E41
The Power for the starting circuit runs though the computer. I have power going in too pcm but no power coming out. When I apply power to yel/blk wire witch goes to starter relay it will crank over but will not start with key in run position. There are no code...
2002 Chevrolet Impala LS 3.8L abs VIN: 2G1WH55K92
Not really sure if this should be in the ABS or HVAC areas and this has been crossposted on the Snap-On Verus Forum. Just curious if anyone has had communication issues with an 02 Impala LS 3.8. Car originally came in with ABS light, Low Trac Light and Low Ti...
2008 Chevrolet Silverado 1500 LT 5.3L Transfer case VIN: 1GCEK19038
Greetings fellow techs and thanks for reading this help request. This pickup is owned by a local farmer and as such it gets driven off road in 4x4 fairly often but is very well maintained. The owner's complaint was that occasionally [about once a week] when he...
2008 Chevrolet Express 3500 6.0L No Crank VIN: 1GBJK34K98
Thank you to all the hard working Tech's who have a idea on this one. Customer complains of batteries must be recharged to get it started after sitting over 12 hours in cold weather. Then he was out pulling trees out of the woods and within a mile of a hard pu...
2010 Chevrolet IMPALA 3.5L Sdm VIN: 2G1WB5EN9A
Any help would be greatly appreciated. We have a 2010 Impala that a customer installed both front air bags (out of a 2009 and are used) a new SDM and both seat belt assemblies. After using a Tech2 and Tis 2web to program the SDM three codes appear. B1019 sympt...
2000 Geo TRACKER 2.0L MIL Lamp on VIN: 2CNBJ13C3Y
Hello and thank you for taking the time to help me out. Because the usual suspects have already been addressed I have a few particular questions because at the moment I am stumped. First I have a tech 2 and it does not seem to have the capability to actuate th... Trouble codes: P0400 (Egr flow out of range)
1995 GMC Jimmy SLT 4.3L front differential VIN: 1GKDT13W8S
I have here a Jimmy that is not engaging the front diff into 4X4. Neither lo nor high. When I have it up on the lift in drive and put it into 4X4. The transfer case does go into both and the front drive shaft will spin going into the front axle. So far I have ...
1998 GMC K1500 Sierra SL 5.7L No Start, Stall VIN: 1GTEK19RXW
This vehicle came to us from another shop. Intermittently it will "hickup" or "studder" while driving like a quick misfire or the engine shuts off for a second, but no dash lights come on. We have duplicated it 3 times in 4 days. The last time it acted up it s...
2000 Oldsmobile Bravada 4.3L Speedometer VIN: 1GHDT13W5Y
Hello techs, we installed a used transmission in this vehicle because it had no 3rd gear. Since then, we have no speedometer. No vehicle speed shows on scan tool. Replaced the speed sensor on transfer case, no change. Had to take a break from it and can't chec...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Park Avenue 3.8L Starting VIN: 1G4CW52K8Y
thanks to all the replies the fix was the pass lock 111 module as luck would have it my tech 2 went down on me so i could not comm. with the security system as my snap on scanner does not give this option i did have a p1626 and a u1000 if you tried to clear th...
1991 Chevrolet Camaro Z28 5.7L Hesitation, Cuts out, Misfire VIN: 1G1FP2381M
The customer took the car to the dealer and they told him the TV cable needed adjusting. I doubt that helped but the customer took the car home.
2004 Chevrolet Silverado 2500 HD WT 6.6L No Start, Stall VIN: 1GCHK23114
Hey, thanks guy's, I when about it a bit differently, I put an old lift pump inline at the fuel filter housing and low and behold, all the little leaks showed up. It was leaking from everywhere on the filter housing. Replaced the housing, bleed the air from th...
2005 Chevrolet Trailblazer LT 4.2L Accessories VIN: 1GNDT13S45
A couple replies told me that the mileage & program should be on the cluster if you ordered it from a dealer. We got it from a dealer but it had no mileage or program. The SW ordered it. I used the pass thru on the tech 2 and followed the directions on the TIS...
2006 Chevrolet Express 3500 6.0L Misfire VIN: 1GBJG31U66
Firstly Thanks to all the Great Techs that replied! It did turn out to be a bad connection/terminal at #8 ignition coil connector, As Mark and Fred suggested. Don't know why 1 was misfiring, but fixing coil connector on 8 and problem was solved. Some one said ... Trouble codes: P0300.
1998 Pontiac Grand Prix GTP 3.8L Drive Range VIN: 1G2WP5212W
Upon tear down of transmission, found large bolt from valve body to the driven sprocket support loose. This is where the feed holes are for the 4 clutches. Most likely pressure was bleeding off at this location. Have not reinstalled to verify, but I'm confiden...
2002 Pontiac Bonneville SE 3.8L Cuts out, Misfire VIN: 1G2HX54K62
Thank you to everyone that replied. This is such a great resource. Most all replies were right on the money. I unplugged the MAF sensor this morning and car ran great. I hooked up the scope to the MAF to verify problem. Replaced it with a new one and car runs ... Trouble codes: P0131 (p1131-), P1131 (testing and results).
2004 Pontiac Grand Prix GT1 3.8L No Start VIN: 22G2WP5524
Thanks to all that replied. Thomas from Pa. got me back on track. I was worrying about serial data when I should have gone for the ck eng. light. Went back to the basics and found that i must have missed the bat power to the pcm. Had power at the fuse box but ...
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