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Prev Professional Automotive Repair Technical Discussions for June 13, 2007
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Open Help Requests for GM
Help Request Answers
1998 Buick Century Limited 3.1L readiness monitors VIN: 2G4WY52M5W
this car runs fine, it came in with an egr code but we cleaned out the ports and replaced the egr valve. next we cleared the codes and took the car on a drive cycle to make it ready for inspection. The problem now is that the Cat, Evap, Egr, and HO2s monitors ...
2003 Buick Rendezvous CXL 3.4L awd VIN: 3G5DB03E12
Greetings GM techs. This one came to us yesterday with the AWD DISABLE light on. scanned all the systems for codes and found none. The only seemingly pertinent clues to the problem are in the AWD data section of my scan tool where I found "AWD fluid temp disab...
1994 Chevrolet S10 Blazer Tahoe 4.3L Surge, Stall VIN: 1GNDT13W3R
After a cold startup ok until warms up then on sligt acceleration with or whithout load It feels like the RPM limiter comes in at about 1700 rpm,but pass 2000 rpm the truck runs good,sometimes it stalls and its hard to start.
1999 Chevrolet Malibu 2.4L No Start, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1ND52T1X
Thanks for all who read, this car is a headache car, first came in no start, customer claim it stall out on them, tow to Canadian Tire store, Code P0300 random misfire cyl detect, quote for 4 AC injector and fuel regulator, but don't garauntee it will fix the ... Trouble codes: P0300 (Multi cyl misfire detected), P200
1999 Chevrolet K2500 5.7L Poor Idle Quality, Hesitation VIN: 1GCGK24R4X
this as been in the shop for a week came here with a misfire and fuel pump noise. code for o2 sensor ,replace o2, full tune up and gm fuel pump. drive down the highway get into the thottle hesitation and loss of power. and just off idle fell like you got a dea...
2000 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13WOY
4wd switch will not switch,all lights come on at start-2 hi on now,press any button & no responses(no flashing, no engagement),ran check with scanner & can control all gears & lights(2 hi, 4 hi, 4 lo & neutral). replaced switch w/aftermarket & new gm switches ...
2001 Chevrolet Tracker LT 2.5L right front VIN: 2CNBJ63411
Car has a tin type thump noise when going over a bump or in pot hole. From the driver seat, it sounds like it is in the right side of dash. from passenger side it sounds like right front suspension. We actually had a tech ride under the hood in our lot to try ...
2002 Chevrolet Silverado 2500 HD 8.1L Misfire, Poor Fuel Economy VIN: 1GCHK29G22
Hello all, This is a farm truck and is used HARD and pulling overloaded trailers.We stay on top of routine maintenance when the vehicle is available to come in to shop. This time it has multiple problems;customer complains of no power and bad running;down to 5... Trouble codes: P0218, P1683, P300, U1041
2003 Chevrolet Trailblazer North Face 4.2L leak VIN: 1GNDT13S33
this truck came in for a quick check of fluid leak cleand and dye checked fluid coming out of transmission vent tube. fluid does not apear to be over full or burnt customer staes leaks more when out side temp is hot or when pulling a trailer we are not a trans...
2004 Chevrolet Silverado 2500 HD 6.6L excessive ex. smoke VIN: 1GCHK29194
Duramax diesel, has been used mainly for highway driving, and some light towing. Runs good, customer notes no decrease in power, but was uncertain about any changes in fuel mileage. Problem is excessive blue/white smoke from exhaust. The symptoms have come on ...
2005 Chevrolet Trailblazer LS 4.2L rear hvac VIN: 1GNET16S55
truck came in with rear blower inop. i replaced rear blower motor resistor and got it to work. now the rear hvac contols will not control the air temp. it is operational with the front controls. i'm thinking it may be the rear hvac controller but want to know ...
1994 Geo Metro 1.0L Clutch Cable VIN: 2C1MR246XR
This is just one example. I am blessed with several Geo Metros and am running into problems getting quality parts. GM either does not have the parts or they are outrageously priced. Sometimes I can interchange with Suzuki Swift and get parts through the Suzuki...
2002 GMC Yukon XL 1500 SLE 5.3L Hard Start VIN: 1GKFK16Z32
Thanks in advance for any help. This truck came in originaly for check eng.light, found lean bank 1 & 2. oxy sensors & maf cheched out, no vac. leaks,fuel pressure Slightly low @ 45 psi. Fuel pump was running at 11.6 amp which we fugured too high. instaled new...
2004 GMC Sierra 1500 SLE 5.3L Hesitation VIN: 2GTEK13T34
Hi all, This vehicle has a very intermittent concern. Customer states sometimes when he steps into vehicle to pass someone (passing gear) vehicle sounds like it is backfiring, it jerks, and then will come out of it after jerking a few times. He also says the...
1999 Pontiac Montana 3.4L No Start VIN: 1GMDX03E4X
picked up with no start cranked 3 times 3rd time it started and ran ok. no start let sit for a few minutes starts like nothing is wrong.cked all pids seem ok.

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Custom 3.8L lost ground circuit VIN: 1G4HP52L1S
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
we finnaly fixed this unit- first we replaced the fuel tank, fuel filter, blow out lines - cleaned fuel rail and injectors- now have 40 -45 psi Than we went after the computer- found harness shorted or open going though firewall- rewired three circuits- remove... Trouble codes: P0171 (fuel trim lean), P0325 (knock failure), P0401 (egr flow test failure).
1995 Cadillac DeVille 4.9L Radio VIN: 1G6KD52B1S
Traced excessive draw to radio control head in dash. One person sugested possible shorted diodes in control head. Attempted to find diodes, found instead draw to be from front display board-small burnt spot also noted in corner of display. Replaced redio contr...
1998 Cadillac DeVille 4.6L Power Steering VIN: 1G6KD54Y2W
thank you very much for all the suggestions! I had the same feeling about the rack being bad but wanted to get a few more opinions.
2003 Cadillac CTS 3.2L Cooling Systems VIN: 1G6DM57N63
Thanks for the help. It was seeping from the oil cooler under the intake manifold. Thanks Mike P
1988 Chevrolet Camaro 5.0L Stall VIN: 1G1FP21E2J
We have repaired this vehicle. Taking suggestions from all of you and Jasper we replaced the prom but did not replace the fuel injectors. The company that supplied us the prom was able to program it for the 305 injectors. This took care of my lean idle prob...
1989 Chevrolet Camaro RS 5.0L Poor Idle Quality, Poor Fuel Economy, no timing advance VIN: 1G1FP31E7K
Thank you all, the problem was a combination of a cracked magnet and the pick up coil. the crack was causing the miss and the pick up coil had a very low a/c signal (.25) and this must be what the ecm is looking for to advance the timing. all is well and the c...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L No Start VIN: 2G1FP22P9P
A special thanks to Chris [...] for his helpful info. The distributor drive shaft is indexed with a blind spline so the distributor will only go on one way.put everything back together and zoom. p.s. I can't believe ALL parts companies,aftermarket and OE...
1999 Chevrolet Astro 4.3L ABS speed sensor VIN: 1GBEL19W3X
The truck is done and back on the road. I finally looked real close at the sensor as suggested by Jason and saw it was to short. The original was about 1/8 inch longer so it was sitting to far from the tone ring. I decided to put a hub bearing in it but the...
2001 Chevrolet Camaro 3.8L Security System VIN: 2G1FP22KX1
Thanks for everyone's response, it ended up being the LED on the dash that was blowed, causing all of the problems.
2002 Chevrolet Blazer LS 4.3L rear wiper syst VIN: 1GNDT13W52
ok the check valve did the trick, thank you gentlemen and LADIES! [efg] What happened was, someone removed the check valve at some point and just stuck a hose on! BRILLIANT!!!
1996 GMC K3500 Sierra SL 7.4L pressure plate
thanks for all the help.Once again, I believe the collective knowledge of others far exceeds the feeble mind of one,Mine! Today I recieved a call from the customer, about anoither vehicle he has. throughout the conversation, he never mentioned this particula...
1998 Oldsmobile Aurora 4.0L tachometer VIN: 1G3GR62C4W
thank you guys for your help. it took me awhile to fix this one. after doing a pin point test wire for wire and finding all good even the grounds and adding a new one to the ip. i new the ip had to be bad. i then sent it to united radio and they sent a refurbi...
2003 Pontiac Aztek 3.4L Stall, Misfire, MIL Lamp on VIN: 3G7DB03EX3
Thanks to everyone who replied to this help request. Paul from North Dakota hit the nail on the head. When all else fails check power and ground circuits. The ground wires at the transaxle bellhousing bolt were not tight. After I tighten the nut holding the... Trouble codes: U1040 (Loss of class 2 communicationthis code was in the IPC), U1016 (Loss of class 2 communicationsthis code was in the BCM), U1016 (Loss of class 2 communicationsthis code was in the BCM).
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5280X
I would like to greatlt thank all who replied youre feed back was great. I waited to close this cause i wanted to be sure that this vehicle was fixed. I checked the parts we installed on the tune up all were a/c delco i even clean underneath the icm to make su... Trouble codes: P0304 (cylinder 4 missfire).
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