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Prev Professional Automotive Repair Technical Discussions for November 4, 2004
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L MIL Lamp on VIN: 1G4GD2213S
Hi, thanks in advance for any help. This Riv has the service engine soon light on but there are no codes in the present code screen. The history codes are numerous (15 total). The vehicle runs perfect. By performing the clear codes option the light will stay o...
1996 Buick Regal Custom 3.1L Excessive Emissions, Poor Idle Quality, Misfire VIN: 2G4WB52M4T
Good morning group i have a 96 regal 3.1 that has a very poor idle but seems to rev ok. We replaced the cylinder heads on it about 6 months ago and all has been fine until now. I honestly cannot isolate the problem. It appears to be more ignition related but i...
1996 Cadillac DeVille 4.6L Surge, Misfire, Slight bucking 30-50 VIN: 1G6KD52YXT
Hello, Could use some help on this Cadillac. Seems like no one else is having the same problem by looking in the archives. In short the customer complains of a jerking sensation between 30- 50 MPH under light load. I am finally able to duplicate it on every t...
1996 Chevrolet Express 1500 5.0L Hesitation, Cuts out, Stall VIN: 1GBFG15M2T
hello members i need some help with a van that i have inherited it will stall under accel. at all temps other shop has replaced maf tps and fuel pump with no improvement if you unplug tps or vacuum sensor van runs correctly have no codes and looking for some i...
1996 Chevrolet Astro 4.3L Excessive Emissions, Poor Idle Quality VIN: 1GBDM19WTB
fuel pressure when running at 78-80 psi.engine rich.remove fuel return line and run into fuel can at engine intake manifold connection-pressure maintains 80 psi.regulator changed twice with same results.i wonder if plastic injector body could be at fault.there... Trouble codes: 172 (rich exhaust), 175 (rich exhaust)
1997 Chevrolet Blazer 4.3L flex plate
hi group. this 4wd blazer came in with the cracked flex plate, also the flex plate been replaced 4-5 time and trans been rebuilted twice at transmission shop. when i put the first flex plate at our shop. we use GM part and tighed the bolt pattern on the flex p...
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W5W
car was towed in with no start checked for spark and fuel pressure had 10lbs fuel pressure, replaced fuel pump. it now has 58lbs and holds for at least 30 min. all is well untill two days later towed back in no start but it starts every time i turn key told cu...
1999 Chevrolet Corvette 5.7L Starting VIN: 1G1YY32G2X
Hi,guys. Intermintent no start. No crank with key on start position. If you wait a couple minutes it will normally start. Vechicle theft deterant ??? Any input would be apreciated. Thanks in advanced!!!
1999 Chevrolet Tahoe LS 5.7L steering wheel VIN: 1GNEK13R2X
hello techs, there is jerking in the steering wheel, it feels like a broken belt in the tire. the customer has only been feeling it when the vehicle is cold, when it warms up he does not feel it. i test drove it, and i felt the jerking. it would jerk going do...
1992 GMC motorhome 454CID engine VIN: 70N6322373
Okay, I really hope that someone can help me out with this POS. This truck will backfire through exhaust going down the highway. It will also run like it is running out of fuel. The fuel pressure regulator was changed and the fuel pressure is normal (12-15psi...
2000 GMC Sierra 1500 SL 5.3L Surge, Misfire, MIL Lamp on VIN: 2GTEK19T41
changed fuel pump fuel pressure reg,plugs& wires,fuel filter surges on ACCELERATION Trouble codes: P0300
1994 Oldsmobile 88 Royale 3.8L climate contol head VIN: 1G3HY5218R
Hello fellas!!! this is my 4th time needing help on here since '99. straight to the point... I've got this olds that I'm trying to fix for a long time customer. The complaint is while he and his wife are driving along the hvac system goes to complete cold inte...
1999 Oldsmobile Alero GL 3.4L security light on VIN: 1G3NL52E7X
The customer came in because the security would stay on intermittently and the car would also not start internittently. (not necessarily at the same time) I could not duplicate either condition but I noticed that the key could be removed in any position and re...
2001 Oldsmobile Aurora 3.5L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G3GR64H61
Hey guys, I've done about an hr. diag. on this one and not too sure where to go from here. This car was here about 1k miles ago for a ruptured regulator diaphragm causing a hard start. We replaced it, cust. was happy. Now it's back and idling rough/when drivin...
2002 Pontiac Montana 3.4L Surge, Misfire, MIL Lamp on VIN: 1GMDV13E82
Vehicle has a miss under heavy acceleration. It only is appearant when the pedal is all the way to the floor. Watching missfire counter while the sympton is there, we get only a few missfires and they come on all cylinders in a random fashion. Replaced 24x CKP... Trouble codes: P0336 (24X CKP Signal irratic or missing)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L Cuts out VIN: 1G4HP52L4R
thanks for everybody that wrote back. here was the problem. traced wires from crank sensor to ignition mod. found signal wire from crank sensor was rubbing on mounting plate of icm. allong with 4 other wires that were rubbing to the point the wires were showin...
1988 Chevrolet S10 Blazer Sport 4.3L Poor Idle Quality, Surge, Stall VIN: 1GNCT18Z7J
This one is going down the road as customer does not wish to spend anymore money on it. I tried all the suggestions that were sent witch included cleaning the EGR valve, disconnecting the timing connector, replacing the ECT sensor, Testing the fuel pump using ...
1995 Chevrolet Lumina APV 3.8L Cuts out, Misfire VIN: 1GNDU06L5S
Well, thanks to iATN members, another one is fixed. I received suggestions of fuel pump and injectors, cam magnet and a couple others. What actually led me to the problem was a fix post I read in my email yesterday from Stuart Terry and his 1994 Silhouette. He...
1996 Chevrolet Lumina 3.1L suspension VIN: 2G1WL52M4T
O K it's fixed, Simple but odd problem, the support bar from the right side top of the strut tower to the upper radiator support was a little loose.I didn't think the body flexed that much I guess thats why they put it there.Got some good tips that were close ...
2000 Chevrolet Tahoe LT 5.3L No Start, Hesitation, Stall VIN: 1GNEK13T5Y
Finally, We finally got this puppy to duplicate the complaint. While I was trying to start it, all the sudden it sounded as if the starter was binding. Tony and Robert hit it on the head. I replaced the crank sensor (as the TSB stated) and gave the vehicle bac...
2000 Chevrolet Impala LS 3.8L lr wheel speed sensor VIN: 2G1WH55K2Y
the problem ended up being the wires were grounding out behind the rear seat intermitantly, not when i was test thank you, for all of the great ideas
2000 Chevrolet Suburban 1500 LT 5.3L hard start hot VIN: 3GNFK16T7Y
i recd 12 replies, 9 of which were for pressure regulator, upon further inspection, regulator would leak fuel hot after a 15 minute soak. it would not leak at first, it had to set for at least 10 minutes with vac line off to see leak. thanks everybody. best to...
2003 Chevrolet cavalier 2.2L No Start, Cuts out, Stall VIN: 1G1JC52F53
The crank sensor was loose, removed it and reinstalled no problems since thanks for the help
2000 GMC Sonoma SL 4.3L brake booster VIN: 1GTDT19W5Y
I received alot of great info on this problem child. In general though there was some conflict whether the booster could cause this low pedal condition.As instructed I pinched off all the hoses and plugged the master ports and found a higher pedal, but not as ...
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