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Prev Professional Automotive Repair Technical Discussions for November 19, 2004
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster Limited 5.7L Surge, Poor Fuel Economy, Stays in Clear Flood VIN: 1G4BT5372N
This vehicle origionaly came in on a wrecker for a no start condition. Testing located a bad pick-up in the dist. Module and pick-up both replaced and timing reset to zero degrees. Vehicle started and idled okay. When vehicle was placed in D the engine acclera...
1995 Buick Riviera 3.8L ebtcm/pmv VIN: 1G4GS1M1L6
Diag and repl pmv/pump assy's as per Manual (common problem and fix on these GM's) only code 45 recurs. Found GM bull to repl l/f cooling fan harness w/updated diode suppressed model, and repl ebtcm for spike short from fan. (will include bull# next post sorry...
1998 Buick Park Avenue 3.8L missfire cyl 1 VIN: 1G4CW52K3W
Now engine runs but after it gets warm it missfires on # 1 cylinder. Fuel pressure good and holds, ignition good no vacuum leaks. Compression on #1 is 90lbs on the other cylinders it is 174-185lbs Pulled the front valve cover loosened rocker arms for #1 put sh...
1994 Cadillac Eldorado 4.6L mil hard shift VIN: 1G6EL12Y1R
Ok. all you cad guys and gals. This nightmare all started with a good customer coming in and requesting a dealer reman engine and trans.. this car obviously has sentimental value . well one of my techs performed the job. well after all was done , we took it fo...
1986 Chevrolet Caprice Classic Brougham 5.0L turn signals VIN: 1G1BN69H0G
when operating the turn signals to the right, everything works normally. when the left signal is activated the normal turn lamps function, but the left marker lamps flashes. if you turn the headlamp switch to either the running light position or all the way to...
1987 Chevrolet R10 Scottsdale 5.0L turn signal flasher VIN: 1GCDK14H4J
customer fails safety inspection for no turn signals/funny lighting at rear of truck. BTW it has aftermarket trailer light wire harness "installed". I spend 3 hours replacing & repairing wires to tag light, trailer harness, R & L lens housings, inc'l new bulbs...
1994 Chevrolet K2500 Cheyenne 5.7L 4th gear VIN: 1GCGK24K4R
This 4L80E Trans came in with no fourth gear complaint. It now has new seals and friction (old friction not that bad). It will shift into fourth and will cruise with very light throttle, but slips or goes into neutral when trying to accelerate in fourth (also ...
1996 Chevrolet K1500 5.7L converter VIN: 1GCEK14R7T
we have scanned and watched all sensors related to pwm solenoid and converter. we do not see any problems with them. we had another shop scan the vehicle with a tech 2. they came up with the vcm requesting 88% lockup upon engagement. this is what the vehicle ...
1998 Chevrolet Camaro 3.8L Hesitation, Misfire, MIL Lamp on VIN: 2G1FP22K6W
Vehicle is missing on #2,5 and 6 cylinders at cold startup. Misfire history is #2-1258, #5-43 and #6-26. We checked for an injector bleeding down by isolating the fuel rail and it only lost about 4 psi. When the supply line, return line and pump were tested it... Trouble codes: P0300 (Engine Misfire Detected)
1998 Chevrolet S10 2.2L MIL Lamp on VIN: 1GTCS1449W
came in with mil lamp on.scan shows crank sensor codes but i can't find any info on these codes not even in the book that came with my scanner or in my service manuals.ran the wiring and checked the grounds all test ok. would appreciate anyone who can steer me... Trouble codes: 1336 (crank sensor variation not specified), 1336P
1999 Chevrolet Tahoe LS 5.7L radio/lighting VIN: 1GNEK13R9X
This truck has two separate issues with the radio, first the radio will power up but wuth no volume. Sometimes if you move the power seat or another accesory the volume will come right on. Second the radio stays on with key out till you open the door but then ...
2000 Chevrolet Tahoe 5.3L ABS Module VIN: T8YJ200133
ABS operation happens when coming to a stop at 7-8 mph. When using a scanner left front wheel speed sensor reads normal until about 7 mph then drops to 3 mph and ABS kicks in.Other wheels read normal down to 3 mph. Replaced speed sensor did not fix used scope ...
2001 Chevrolet Suburban 2500 8.1L MIL Lamp on VIN: 3GNGK26G41
after new cmp was installed, no problems @ first. cold start a couple days after replacement and light was back on w/ po343 only. Have scoped sensor, wiggled harness while monitoring cmp pid on scan tool(no changes) all circuits testing fine. I am suspicious o... Trouble codes: P0342, P0343
2003 Chevrolet Cavalier LS 2.2L Unknown VIN: 1G1JF12F53
complaint is a intermittant erratic idle,stalls at times.the fuel pressure is 65 psi, should be 50-60 according to specs. fuel volume is good. o2 po171 and po172 were cleared and didn't return on test drives.the fuel pressure regulator vacuum supply is routed ...
2003 GMC Yukon SLE 5.3L On Star VIN: 1GKEK13Z43
Hi all, I road tested and confirmed this crackle noise is coming from the On-Star speaker. Has anyone had a similar problem? This is an anoyying noise the customer wants to get rid of. Thanks ahead of timre to those who reply.
1991 Pontiac Bonneville SE 3.8L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2HX54CM1
Engine misses on the same 2 cylinders at the same time while under a load ONLY. Under normal acceleration, no miss. Light reving in park, no miss. A sudden acceleration in park and it misses. So I backed it against the cinder block wall, left it in reverse, an...
1997 Pontiac Sunfire SE 2.2L instrument cluster
Hi everyone, I hope someone can point me in the right direction with this very intermittent problem. The customer brought the car to us complaining of a intermittent condition where when she activates the windshield wipers all gauges in the instrument cluste...
1998 Pontiac Trans Sport Montana 3.4L MIL Lamp on VIN: 1GMDU03E1W
Customer complaint SES light on runs ok. Latest PCM calibration, does not require update. At idle in closed loop long term fuel trim -21%. This is a long time customer (bosses father) buys his fuel here. I am out of ideas I sure hope someone has ran into this.... Trouble codes: P0172 (fuel trim system rich)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y9W
As always fix the obvious first, I replaced the compressor, orifice tube and dryer, system works ok now. Thanks to all for the help, Chris.
1992 Chevrolet Astro CL 4.3L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1GNDM19Z5N
i have replaced ballancer and replaced dis. assy. the missing problem was intake leaking witch i have fixed but still cannot bring timing into perspective
1994 Chevrolet G20 Sportvan 5.7L light on VIN: 1GBEG25K4R
Well today i took the van for a drive and the light didnt come on anymore.im not sure that I really did anything to fix this or not.The only thing i did was to clean the junction block at the battery that supplies power to the abs module. thanks to everyone th...
1994 Chevrolet Beretta 3.1L starts & dies VIN: 1G1LV15MXR
thanks to every one that offered help the problem turned out to be that cardone or who ever flashed the reman computer cant do any thing right.i got a used pcm from wrecking yard & the car fired right up go figher i went threw all the wiring & sensor to still ... Trouble codes: 82 (3x signal error in history).
1983 GMC Jimmy 5.7L erratic o2 sensor VIN: 1G5EK18L3D
higher than normal oxygen sensor readings: traced the problem to a bad ground at the thermostat housing, could have added a separate ground at the sensor though.
1994 GMC Jimmy SLE 4.3L digital dash lights VIN: 1GKDT13W3R
just finish replacing the dash assy thanks for the help everone said replace dash that took care of problem
1991 Pontiac Sunbird LE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall VIN: 1G2JB11T8M
thank you for your help. IAC was acting up when in drive and using the brake. more air was not getting in and causing the car to run rough
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