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Prev Professional Automotive Repair Technical Discussions for March 22, 2011
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Open Help Requests for GM
Help Request Answers
2004 Buick LeSabre Custom 3.8L No Start VIN: 1234567890
Hello, thanks in advance for reading this. Sorry about the fake VIN, I am no longer at the shop. This is a plain old 2004 Buick with a 3.8. It does not start, it does crank. The vehicle acts like it almost wants to start, sometimes when you release the key aft...
2002 Cadillac DeVille 4.6L Steering VIN: 1G6KD54YC2
The customer had a concern of a noise coming through the steering column. The technicians original suggestion was the to replace the wheel bearing which we replaced. This did not resolve the concern, then replaced the intermediate shaft between the column and ...
2003 Cadillac Escalade EXT 6.0L cruise control VIN: 3GYEK63N63
Hey GM techs, I need some help. A street rodder dropped an 03 Escalade ext eng/trans & computer in a 48 Linoln. He didn't install the instrument cluster or bcm but He got everything working except the cruise control. I scanned the pcm & can see the cruise data...
1991 Chevrolet S10 Blazer 4.3L Vibration VIN: 1GNCS18Z4M
I check the balancer and tightend center bolt slightly, check timing found advanced and returned to specs. Still no change in vibration. I have read previous post requarding an updated trans mount, called local dealer not much help there. This engine has alot ...
1997 Chevrolet K3500 Cheyenne 6.5L Gear Engagement VIN: 1GCHK34F6V
Customer complaint of sometimes hard to get into low/reverse gear. Sometimes it will work great for 2-3 weeks at a time. After sitting overnight, it was hard to get into gear. Pedal felt normal. Drove into shop, while on lift, engine off, pedal depressed, clut...
2006 Chevrolet Equinox LT 3.4L No Start, hesitates VIN: 2CNDL73F66
This car will not start when cold(sub zero)I can hear the fuel pump run but has zero pressure at the fuel rail. It has power draw of 3.0 amps (tested draw when new pump was installed and was 6.8 amps)when it warms to 30 degrees or better starts and runs but se...
2007 GMC W3500 Forward W3S042 5.2L Hesitation, MIL Lamp on VIN: J8DB4W1687
Thanks in advance for any help, this truck was here a couple of weeks ago with the same codes and limited power,I did the slow regeneration of exhaust using tech. 2 method and cleared codes run good untill now. Alldata says when po2e7 code is set the truck wil... Trouble codes: P02E7, P02E8, P2463, P244B
2007 GMC Sierra 3500 HD WT 6.6L Hesitation, MIL Lamp on VIN: 1GDE4C1237
Hello we have a 6.6 Diesel duramax came in with a check engine light on and lack of power it could not drive faster than 25 MPH,we scanned it and it had a code P0088 Fuel Rail Pressure Too High,and with the scantool we could not adjust the prassure manualy it ... Trouble codes: P0087 (Fuel Rail Pressure Too Low)
1999 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB1242X
Hi fellow IATN Techs, hope some of you can help me out with this Sunfire. This was at another shop & towed in as a no start. They had put a new fuel pump & ign. coil. The car has no 12v power from the computer to the fuel pump relay( pin 8). Also...
2003 Pontiac Vibe 1.8L Air Bag Light VIN: 5Y2SL62883
Hello all, I admit to being a little weak on air bag systems, that being said, this vibe has the air bag light on all the time, customer says its been on for over 2 years. My Verus scan tool says no codes, but the light remains on, I dont think the Verus is wo...
2004 Pontiac Grand Prix GT2 3.8L Charging VIN: 2G2WP522X4
This mystery for gm tech. Customer drove car in stated charging system failier message display. Check charge system under hood show 14.15v charging ok. Customer did stated while driving on hwy instrument clustor was dead for few second execept speedometor then...
2007 Pontiac Grand Prix GT 3.8L air bag VIN: 2G2WR55407
Repalced all air bag component's for local body shop. Cleared codes and preform system test. On key up sir light flashes 7 times as normal then goes out, then returns flashing very slowly. Checked ALL modules for codes found none in any of them. Scratchin my h...
2003 Saturn LW300 3.0L No Start, MIL Lamp on VIN: 1G8JW84R13
We are unable to communicate with OBD. When disconnecting IAC fly by wire unit the fuel pump will come on, the fuel pressure is on and the vehicle can be started but cannot accelerated. When the wire is connected, the vehicle will stay at about 600-700 rpm. Th...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Chevrolet C-Series Kodiak C6H042 7.2L Fuel Gauge, cuise control VIN: 1GBK7H1C41
I thank the 3 people who offered help. Their suggestions do sound like they may help others that need ideas on a general direction to proceed with diagnostics. No useful information was given to me by the 3 respondents that offered help. I was not looking for ...
2002 Chevrolet S10 4.3L Filter VIN: 1GCCS19W02
WoW!! Yer Great, Got the LiL Guffer opened up. We found an inordinant amount of sludge in the pan, the Pressure Relief was in a fixed position from the sludge deposits. the filter also was full of the Goo. No metal is seen, I had the customer come by for a loo...
2005 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNDM19X25
Thanks to everyone that took the time in replying and giving helpful info. This vehicle has no EGR, many said check vacuum leaks I had smoked the intake system several times and no leaks showed up. I sprayed carb cleaner and added propane along intake and... Trouble codes: P0306 (testing and results).
2007 Chevrolet Silverado 3500 HD LT 6.6L fuel tank won't fill VIN: 1GCJK33627
2007 Chevrolet Express 2500 4.8L Poor Idle Quality, Cuts out VIN: 1GCG29YV57
I would like to thank all that responded to this request, Deke from Ohio was the closest to the actual fix, the problem was a cloged transmission cooler, our transmission guy came down and removed the outlet line from the cooler and then started the van, the f... Trouble codes: P0171, P0218.
2007 Chevrolet Impala LS 3.5L Battery light comes on, traction light comes on
Well, unfortunately (or fortunately depending on how you look at it) the customer called and said the vehicle did not act up all weekend so I don't have a fix for it. He did not want to bring it in until it acted up for us to diagnose. Thanks for all the inf...
1999 GMC cut away 5.7L Hesitation, Cuts out, Poor Fuel Economy VIN: 1GBJG31RXX
I finally made the truck mess up while I was driving it with the scan tool reading data. It appears it goes severely lean on both banks. One of the drivers told me the problem is much worse after filling up. I saw the truck go lean, had full voltage at pump, c...
2000 GMC Jimmy SLS 4.3L Mechanical VIN: 1GKCT18W3Y
thnaks everyone again ,,,we took the vehicle for a another road test for the problem to occur and then pulled the master away from the brake booster to see if the front wheels became free again and sure enough they did ,,we ordered a brake boster replaved it a...
2006 Hummer H3 3.5L Misfire VIN: 5GTDN13646
Hi everyone: Thanks to all who replied. We did not fix this car. Based on about 98% of replies this car was sent to dealer. The basics was to swap coils and see if misfire moved. It did not in our case. Next test was a cylinder leak test. The specs should be n... Trouble codes: P0302 (Cyl 2 misfire).
2001 Pontiac Grand Am GT 3.4L fails emissions test VIN: 1G2NW52E11
I would like to thank everyone who replied. Ken from Illinois is the employee of the week at least at my shop. He opened my eyes to not looking over the simple things. It turned out I over looked the air intake temp sensor. It was reading a much colder reading...
2004 Pontiac Grand Prix GTP 3.8L fuel gauge VIN: 2G2WR52434
Thanks for everyones help. Maybe I should be a little more thorough. I had checked for a ground back at the connector in the rear and got one,so I (ass)umed that I was getting ground from the pcm. I decided to check for continuity on the ground wire from the p...
2005 Pontiac Vibe 1.8L MIL Lamp on VIN: 5YSL63855Z
As it turns out the returning CEL was due to an evap failure, not the P0171 code displayed previously. It's been gone for a while now without issue. Thanks for all the ideas guys! Trouble codes: P0171.
2008 Saturn Vue XR 3.6L MIL Lamp on VIN: 3GSC153788
The GM dealership said EVAP components are only 3yr 36k. I ohmed the solonoid out and it was 14 ohms. The solenoid still opened and closed good. I removed the solenoid and it was kinda corroded on the top. I got the ok to replace the solenoid and havn't heard ... Trouble codes: P0449 (Vent solenoid circuit problem).
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