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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 22, 2004
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Open Help Requests for GM
Help Request Answers
1996 Cadillac DeVille 4.6L Poor Fuel Economy VIN: 1G6KD52Y0T
All 02 sensors, changed by someone else, due to a MIL, and code set. Since that time customer complaint of poor fuel mileage. Says mileage has gone from mid 20's to 16-18 mpg. Customer is going by the onboard display. Road test seems fine. Car goes like ganbus... Trouble codes: RF256
1989 Chevrolet C1500 Cheyenne 5.7L cruise control VIN: 1GCDC14K6K
Cruise would not work when first tested. Check all fuses,grounds,brake lights,linkage.performed flow chart test per MOD. replaced module per test. Cruised worked for two days. retested with same info.Cruised again worked for Three Days.Replaced box second time...
1991 Chevrolet Corvette 5.7L pcm communication VIN: 1G1YY2389M
this car is giving me static, could use a little help as im not big into vettes and dont really understand the whole ccm thing but see that it acts just like a bcm. the problem is that the sys light comes on just as soon as you start the car, it goes into limp...
1991 Chevrolet K1500 Cheyenne 5.7L Stall VIN: 1GCDK145K5
this 1991 chevrolet p/u 4wd has about confused me. i have no codes present. when the engine is at normal operating temperature and the transmission is moved from park to reverse the engine will stall. also, if you start the engine in neutral and move the trans...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L Poor Idle Quality, Misfire VIN: 2G1FP22PXP
Hello techs , I am working on a camaro that has been converted from an LT1 to a LT4 (kids dad owns local parts store). I was verifing firing order and can not find this motor listed .the order for this car is [...] and his paper work says the updated cam wa...
1994 Chevrolet Camaro Z28 5.7L Surge, Cuts out, MIL Lamp on VIN: 2G1FP22POR
the car always runs good in shop when customer picks it up it dies going down road at cruising speed put into neutral and fires right back up Trouble codes: 16 (low resolution pulse failure), 42 (est grounded), 41 (est open), 36 (high resolution pulse failure/ 51-ecm prom error), 48 (mass air flow system failure/ 18-crank signal open or no signal), 32 (egr system problem/ 46- vats fuel enable problem)
1998 Chevrolet K1500 Cheyenne 5.7L pedal fades VIN: 1GCEK19R8W
The customer is complaining that the brake pedal sinks to the floor when at a stop sign. Another tech had replaced the master cylinder about a month ago to try and solve this problem. I drove the truck and the pedal felt spongy to me so I bleed the brakes. But...
1999 Chevrolet Astro 4.3L Hoses VIN: 1GNEL19W2X
I have this AWD astro with dual A/C and the main hose assembly from compressor is leaking.My question,has anyone replaced one of these?Can it be done with out removing engine?How much time did it take?This hose goes from compressor to condenser/compressor to a...
2000 Chevrolet Blazer LS 4.3L Stall VIN: 1GNCS13W1Y
this car stalls mostly when very hot weather & sitting at stops. customer states that car does not stall in cool weather. when stall occurs car restarts immediately. has anyone seen a common problem with these vehicles. i have not been able to duplicate proble...
2001 Chevrolet Silverado 1500 5.3L No Start, Cuts out, Stall VIN: 1GCEC19T61
Hey all, This truck was towed in after it stalled on the road with customer. Customer states that check engine light was on for 2 days before this happened however there are no codes today. When I got in the truck at first I had no communication with the comp...
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 3GNEK13T42
Hello GM techs . This 6/01 Chevy Avalanche,{ made in Mexico model} has a strong misfire that develops after at least 9 miles of driving . Sometimes the problem carries over and persists when cold started . The misfires are on all cylinders and are as follows f... Trouble codes: P0300, P0351, P, 0446 (evap system - cleared code 385 miles ago did not return . YET)
2001 Chevrolet S10 2.2L Compressor Clutch VIN: 1GCCS195X1
I'm having a little trouble with this one. The truck's compressor clutch will not disengage. The A/C system is putting out cold air but the truck will run hot with the A/C system on in traffic. I used my scan tool to test operation or relay. Compressor cluctch...
1992 Oldsmobile Achieva S 2.3L engine VIN: 1G3NL1430N
hello fellow techs i have this 92 olds achieva with the quad 4 engine and sohc set up and it burns oil bad! when i drove it home it left a huge white trail of smoke behind me that would intensify as the engine ran poorly and the oil pressure guage would peg ou...
1992 Pontiac Bonneville SSEi 3.8L No Start VIN: 1G2HY521XN
Help.Will not run.This car came in the shop with a miss at highway speed.While I was starting to run some testing on inputs to ecm ie. crank sig. and cam sig.I lost my cam sig. and found the magnet was broken on the cam gear.The eng. would run but no inj. timi... Trouble codes: 13 (o2 sensor circuit open short or bad), 18 (crank signal open or no signal), 58 (vats system problem)
1992 Pontiac Grand Prix SE 3.1L No Start, Hesitation, Cuts out, Stall, rotten egg smell VIN: 1124466T2P
after it warmed up rpm go up about 2500 rpms wheni stated it and only came downto 1200 1300 rpms at these higher rpms it woud stall immediatily if i tuched the gas pedal this still happens sometimes if the rpms are normal it seems to be ok but if the rpms woun...
1997 Pontiac Firebird 5.7L headlight motor
hello there.i have a 97'firebird that has a weird problem.the driver side headlight motor after the headlight goes down, the motor runs for 10 seconds then shuts off.the right side is normal as in the light goes down motor stops.i was wondering is there a rela...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K9S
Well, this one is finally fixed. Thanks to Stuart, Jeff, Jeffrey, Ron & Tim for responding to my request for help. Three recommended checking grounds, one the crank sensor and one the PCM. 1) Circuit grounds for this car can be found on both fenders abov... Trouble codes: 321 (Spark reference signal missing), 1361 (IC circuit grounded).
1998 Buick Regal 25th Anniversary Edition 3.8L No Start VIN: 2G4WF5215W
The fix for this vehicle was the fuel pump resistor,evidently this is a common problem,I had at least 4 emails from people who told me to look there. General motors makes a updated resistor kit,( part# [...]) and has you relocate it.I would like to thank ev...
1994 Chevrolet G20 Sportvan 5.7L MIL Lamp on VIN: 1GBEG25K7R
Hello all and kudos to all who posted replies to my post. Special thanks to Mike ,Loni, ,Duane and a Gold Star to Phil. I did a voltage drop test on Grn/Wht wire(12v feed from PCM to F/P relay. I had 13+ v at the PCM but only 7+ at the relay.I started pulling ... Trouble codes: 54 (Cicuit fault Fuel Pump relay).
1995 Chevrolet C3500 Cheyenne 7.4L chassis VIN: 1GCHC39N6S
Wayne and Joe nailed it, front wheel bearings, been doing this 20 years and never seen or heard a bearing act like this. Whats crazy is the bearings are badly pitted and should have been making noise at all times. Thanks for the help Guys, sometimes we can't s...
1997 Chevrolet Tahoe LS 5.7L lo beams and high beams VIN: 1GNEK13R3V
First off thank you to everyone that helped me out. After i removed the bottom cover of the steering column and look at the back of the the turn signal/dimmer switch i found two burnt wires ( as directed ), they had been that way for a while, you could tell th...
1999 Chevrolet Camaro Z28 5.7L electric windows/door locks VIN: 2G1FP22G0X
Sorry for the late Fix Information,My Mother suddenly became ill on 6/26/04 and passed away.The Power Window motor's both went bad at same time,Replaced with rebuilt motor's,As for the Door Lock's,Somebody had wired in a neon light into the wiring harness insi...
1994 Oldsmobile Cutlass Ciera 3.1L clock illumination VIN: 1G3AG53M8R
precision radio emailed my repair, a blown recall transistor caused by customer boosting vehicle incorrectly. Thanx dave
1995 Oldsmobile 88 Royale 3.8L battery VIN: 1G3HN52K1S
Greetings! Great news. The battery drain problem is solved! The feedback from tech's in the field helped me to check some potential nightmares saving lot's of time and frustration. The problem turned out to be a slight short in the trunk light switch. It was...
1996 Oldsmobile Aurora 4.0L Hesitation, Surge VIN: 1G173R4L6W
i wanna thank everybody who help me with problem.especially david [...] who told me to scan and make sure the solenoids are coming on when they should.he was right on.i replaced the valve body and it shifted smooth as silk.thanks again
1994 Pontiac Grand Prix SE 3.1L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G2WJ52MXR
What a great service, actually jeef that i talked to 2 nights ago on the iatn chat room got me in the right direction, after some parts swaping to no avail, we looked closer at the integer and o2 sensor as i stated this problem occured usally on cold car we wa... Trouble codes: 28 (Transmission Pressure switch circuit), 13 (HO2S Error).
1999 Pontiac Montana 3.4L Hesitation, Stall VIN: 1GMDX03E7X
Well the van is now running fine. I wish I could say exactly why. This van is actually my wifes vehicle and she had claimed that the problem still existed after the fuel pump replacement, though I never got to drive it to find out... my mistake. I have my doub...
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