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Prev Professional Automotive Repair Technical Discussions for May 6, 2014
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L compressor VIN: 1G4CW52K9W
This car has two problems that may or may not be related. The cooling fans for the radiator will not activate on their own, also the A/C compressor will not activate on its own. I have allowed the car to reach 242F and no activation. My snap-on verdict scanner...
1999 Chevrolet K1500 LS 5.7L Stall VIN: 1GNFK16R5X
Customer states that the truck will intermittently stall and then start back up. customer just had truck detailed inside and out to include the engine bay. checked codes and their are no current codes but their are history codes listed above. my problem is i h... Trouble codes: P0605 (Control module ROM), U1042 (Loss comm with EBCM), U1064 (Loss of BCM/VTD comm), U1193 (Loss of VIM Class 2 comm)
1999 Chevrolet Astro 4.3L mil VIN: 1GNDM19WXX
I can see slip of up to 500 rpms, but can't feel anything wrong. I see and feel all gears shift and watch tcc commanded and see slip in all gears. When in 4th and tcc on its like 300 rpm slip and then I can see it go negative slip like -100 or so. I will test ...
2008 Chevrolet Tahoe LTZ 5.3L Power supply VIN: 1GNFC13038
Thank you for your time. Customer states that from time to time, he loses all electrical power & the dash goes dead. If he shuts off the car, it will not crank, but will work fine if he wiggles the negative battery cable wires. The cable looks good and passes...
2009 Chevrolet Cobalt LT 2.2L Excessive Emissions, No Start, Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G1AT58H39
Help me please. Car is very hard to start and will not idle on its own. Exhaust smells very bad when you can get it to run. It runs like exhaust cam is out of time. The ecm is commanding solenoid but the Exhaust cmp angle data reads 0 all the time. I have good... Trouble codes: P0014, P0106 (MAP pressure circuit out of range)
1999 GMC C6500 Topkick C6H042 7.4L No Start, MIL Lamp on VIN: 1GDJ6H1B9X
Hi, all, thanks for any help on this one. came in with a code po341 (camshaft position sensor performance). Customer put in own cam sensor distributor assembly. Retimed distributor ( was off). Still set code on 2nd key cycle. Also noted that takes 2-3 times of... Trouble codes: P0341
2001 GMC Yukon SLE 5.3L Misfire VIN: 1GKEK13T01
to all gm techs. got this yukon that's kicking my butt. it has a misfire on cylinders 3 & 4. you can see the cylinders misfire on the data stream. have replaced injectors to no avail. replaced the wires and ran fine, but the vehicle is back with the same codes... Trouble codes: P300
1998 Pontiac Bonneville SE 3.8L door locks VIN: 1G2HX52K3W
Ghost in the machine. Only while driving- when window switches or cig lighter is pressed door locks unlock. No fault codes in any modules- scan tool request shows constant unlock while problem is active. Mall(bcm) module was replaced prior at another garage wi...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet K2500 Suburban 7.4L Stall VIN: 1GBGK26N8P
I'm grateful to every one of you who replied to my request. I have fixed this 7.4L after spending a good amount of time on it checking all the basics. I checked the distributor magnet and messed with timing and kept watching fuel pressure. At one point I orde...
2002 Chevrolet Malibu 3.1L Unknown VIN: 1G1ND52J22
good news-i got her running...bad news - i have no idea how. I checked elec connections relays fuses ...tightened grounds and she started up...customer says she starts up everytime since...told customer about intake defect thats only a matter of time and to ...
2005 Chevrolet Colorado Z85 LS 3.5L Mechanical VIN: 1GCDS13605
The info on Mitchell on-demand is incorrect.. the actual tool looks like a ball joint separator // and once install on the tension-er. The handle can be removed off. The job was done without any issues... We decided not to remove the camshaft actuator and re...
1999 GMC Yukon SLT 5.7L MIL Lamp on VIN: 1GKEK13R8X
Thank you for all of your replies the were vey helpful, the fix on this truck was a bad distributor. Once replaced the code went away and the relearn was done , Thanks agian Trouble codes: P1345 (Cam and crank correlation).
2003 GMC Sierra 2500 SLE 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTHK23U63
found that the spark plugs where wrong. installed correct spark plugs an vehicle runs fine Trouble codes: P0300.
2003 GMC Safari 4.3L Misfire, MIL Lamp on VIN: 1GKDM19X23
Thank you for all the replies.I got really luckie with this repair.It may not be a 100% repair but it did work.#3 exhaust spring was weak.When I held down on the spring the miss fire went away.So I decided to add a custom spring from a harly V2 on that valve... Trouble codes: P0303 (Miss fire).
2004 GMC Sierra 1500 Denali 6.0L Rear wheel steering VIN: 2GTFK69UX4
I was hoping to have an answer for this one but I'm having trouble getting parts. The replies I got said water intrusion is common in the rack on these trucks. I was able to get a new rear position sensor for the truck. The sensor was full of water and it was ...
2001 Oldsmobile Aurora 3.5L pressure control solenoid VIN: 1G3GR62H61
we ended up getting a trans go shift kit and installed what we could with trans in vehicle, cleaned valve body good, replaced pressure control solenoid and changed filter and fluid. shifting real good now and codes have not returned. thanks for all the help on...
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