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Prev Professional Automotive Repair Technical Discussions for March 15, 2006
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille 4.6L No Start, HARD START VIN: 1G6KD54Y5V
car wouldnt start cold after sitting overnight. customer said it started after dealer replaced fuel rail assembly for a recall. did some diagnostics & found spark plugs were being flooded with fuel. checked & replaced weak crankshaft sensors. still a little ha...
1986 Chevrolet Camaro Berlinetta 5.0L gauges VIN: 1G1FP21P2H
this camaro blows fuse for gauges after driving awhile, had some wiring repairs behind dash but never found source of short. have heard that thees camaro's have ground problems, and was hoping that someone out there in camaro land has run into this before, or ...
1989 Chevrolet R3500 Cheyenne 5.7L Cuts out, Misfire VIN: 1GBHR34K9K
truck will pop out tbi when gone 20 miles or so when leaning on it, let off runs fine. idle is good and all readings on scanner are fine. changed tps, o2, est mod, dist, cleaned grounds, [all there also] egr, checked all plug wires one by one to no avail. swap...
1992 Chevrolet Cavalier RS 2.2L No Start VIN: 1G1JC1449N
Hello Everyone, This cavalier was towed to my shop with a no start. When I went out to test, had good fuel pressure, but no spark, no injector pulse, and the scanner would not communicate, further testing I discovered fuse #10 was blown. Replaced fuse, and ha...
1995 Chevrolet Lumina APV 3.8L Misfire VIN: 1GNDU06L9S
this vehicle idles perfectly,it also accelerates perfectly until under a load.the miss is regular not random. i felt it was ignition related until i performed a major tune up including ignition module. i have also replaced cam & crank sensors along with loaner...
1997 Chevrolet K1500 5.7L convertor VIN: 2GCEKI9M4V
Hey guys, been having a tranny problem about 6 months now, {this is my own truck so it gets put on the back burner} I am having a tcc lockup problem, works great cold, problem begains when trans is at operating temp. Sets PO1870 and shifts hard due to increase...
2001 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W61
Towed in on friday and could not check until Monday morning, truck started Monday morning and has been running every sense, we have check fuel psi, spark, pump relay/connectors, pump connectors. it had long term trim (lean)codes for both banks I cleared codes ...
2002 Chevrolet Trailblazer LS 4.2L Mechanical VIN: 1GNDT13S62
Customer is complaining of a knock in engine while running hot or cold, upon research of this from GM the rep says this is normal noise in front top of engine and we have listened to another 4.2 that does the very same thing, also customer is complaining of a ...
2005 Chevrolet Silverado 1500 LS 5.3L soft plug VIN: 2GCEK13T25
This truck was bought in Apr. last year. Cust. is taking it in for the second time to have a soft plug replaced.I do not have the truck it is our secretery's sons truck. I am just curious if any one out there has run across this proublem or if the truck is jus...
1999 GMC Jimmy SL 4.3L rear rotors VIN: 1GKDT13W7X
Vehicle vibrates from rear under braking. I replaced rotors. I measured run out and parallelism and both are with in spec. Run out with dial indicator shows .004 and parallelism with a disc mic. .0003. Rear bearings seam to have some excessive radial play but ...
1997 Oldsmobile Achieva S 2.4L Excessive Emissions, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G3NL52Y9V
When the car idls for 5 minutes it misfires and gallops like crazy. If rpms are held at 3500 it gallops and bucs and jumps like crazy also. Tuned up complete! Can not semm to find a vaccum leak with a smoke machine, absolutly nothing seems to work. Trouble codes: P0300
1997 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GR62C8V
the customer complaint is "dies while driving". I got the car with dtc p101 set and the ses lite on. after reaching operating temp and a short drive at 60 mph, you can let off the gas ( tps at 0%) and coast...the car will die at about 30 mph...no apparent reas... Trouble codes: P0101
1995 Pontiac Grand Am SE 2.3L engine VIN: 1G2NE15D1S
This a relatives car.Enough said. The engine is a crank/ no-start. It was running fine, he shut it off, came back out, and wouldn't restart. The plugs are dripping with fuel after cranking for a couple seconds. Spark is good, obviously fuel is ok. Fuel pressur...
2001 Pontiac Grand Am SE 3.4L Suspension VIN: 1G2NF52T21
A loud popping noise is heard and felt through the floor boards when turning sharply. The rack and pinion was replaced and rechecked for any slop in the mounting. all ok. There is no witness marks that indicate subframe movement, but when we used a chassis ear...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Electra Park Avenue 3.8L No Start VIN: 1G4CW54CXK
Thanks to everyone that responded! Fix was a new connector for CKP sensor. I had wiggled and giggled this a couple of times but never found it. Amaisingly this vehicle would run for about 3 minutes then die and would not start rest of day, but next day would s... Trouble codes: 22 (low voltage TPS), 23 (low voltage air temp MAT), 43 (low or high voltage KS EST related).
2000 Cadillac Seville STS 4.6L Starting VIN: 1G6KY549XY
Jerrod from Kansas was bang on. The only problem ended up being the alternator was painted and my brother didn't clean the paint off for the ground connection. Why & how this caused so much greef is amazing. Thanks for the help.
1990 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GCGK34N4L
OK. . .straight to the point on this one and I will try to be brief. Found the cause of all my problems to be the intake manifold! NOT a cracked manifold and in no way related to a vacuum leak. This one had an issue with the hole inthe mainifold where the dist...
1992 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, High Idle VIN: 1GTDC14Z0N
Most all of the help replies recieved suggested replacing the throttle body base gasket. Although this is a very comon problem with these vehicles the gasket had been replaced prior to this issue and was not leaking now, the only vacuum leaks were those repair... Trouble codes: 44 (Lean Exhaust).
1997 Chevrolet S10 4.3L Hesitation, Surge, Misfire VIN: 1234567ABC
Thank you for all the helpful tips! Several of you guys hit it right on the distributor gear was worn. Cam retard is back to 0 again before it was -16 so all is good again.
1998 Chevrolet Cavalier 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G1JC5245W
Thanks to all who took the time to offer advice. The fix ended up being a new (actually used) PCM in addition to the new egr valve. I tried the old valve with a different PCM and data stream with KOEO still indicated EGR position of 18-26%. I decided to unplug... Trouble codes: P0404 (egr valve pintle position open), P1404 (egr valve closed pintle position).
2004 Chevrolet Impala LS 3.8L instrument cluster VIN: 2G1WH55K64
the fix was another ipc.funny the facility that performs the repair programs the mileage in-every one was 2 miles less than the mileage we told them.guess that equals the quality of the repairs these units.thanks for the help mike
1997 GMC Yukon SLE 5.7L Surge, Misfire, MIL Lamp on VIN: 1GKEK13R9V
Ok I've finally repaired this one. I think I need to have a stupid liscense. Alot of replies said to replace dist. cap. This one had just been installed at GM so I was confident that it was not the problem. so i worked around it, this morning i took the cap of... Trouble codes: P0300.
2004 GMC Sierra 2500 HD SLE 6.6L low rpm limit VIN: 1GTHK24294
this one is fixed it was a bad fuel pressure sensor the truck went back to the dealer for repair i guess it has a 5yr 100000 mile warranty Trouble codes: P1093.
1990 Oldsmobile Delta 88 Royale 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G3HY54C1L
OK Thanks for all the responses, a couple of you hit the nail right on the head with a bad ecm. Everything tested out just fine, so we installed a new module, and it runs great. Thanks for all your help!!! Trouble codes: 41 (cam sensor fault), 42 (electronic spark timing circuit).
1994 Pontiac Bonneville SE 3.8L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1G2HX52L9R
thanks for all the help! i started with sending the pcm back as a defect and replacing it with another reman unit. that one fixed the problems i was dealing with, but it showed very erratic tps readings and it ran the idle rpm's up to 2500! i was tired of deal... Trouble codes: P0321, P0361, P0610.
1998 Pontiac Sunfire GT 2.4L Poor Idle Quality, Surge, Cuts out VIN: 1G2JD12TXW
Thank you all the help. After changing the intake gasket cleaning the EGR vavle and the IAC motor we found the computer(ECM) was telling the iac to move but the motor dose not move greeen\black wire green from a/f rad.leak on wireharness again thank for all th...
2001 Pontiac Grand Am GT 3.4L coolant VIN: 1G2NW52E51
Well As most of you said intake manifold gasket was the main cuprit. Once I got it open found that front coolant passages are located right next to the oil drain back passages. With the poor gasket design anytime the coolant entered a vacuum cycle it can suck ...
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