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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 10, 2005
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Open Help Requests for GM
Help Request Answers
1999 Buick Century Limited 3.1L a.c. control motors VIN: 2G4WY52M5X
Car came in with code B0361 (left actuator feedback short to ground), and code B0441 (left acturtor out of range). Tested per trouble tree, no faults found. Replaced control head per GM tech bulletin 857445. No change in operation. Replaced left actuator motor...
1990 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G6CD5332L
initially checked manifold vacuum and it was at 16in hg and steady at idle, then checked o2 sensor voltage and it was at .865v or higher at all engine speeds(slightly higher as rpm went up and also slightly higher the longer I held rpm steady). Decided to repl... Trouble codes: E49
1996 Cadillac DeVille 4.6L alternator VIN: 1G6KD52YXT
vehicle came in with no charge condition and battery light on. cked circuits at alternator and L terminal had no voltage with engine running. cked wire from ipc not open or shorted. evrything pointed to ipc bad replaced ipc and still have same condition. has c...
1997 Cadillac Eldorado ETC 4.6L monitors don't run VIN: 1G6ET1296V
Hello. this car came to me after to shops and a dealer could not find a problem. the car will not run cat, O2, O2 heater, evap or egr monitors. the last shop drove it for three hundred mile to try to run them for emitions. I tried running them like I have done...
2000 Cadillac Seville SLS 4.6L Misfire, MIL Lamp on VIN: 1G6KS54Y2Y
i put a used engine in this car because it sucked water in through the air filter and exploded the block. i have the car running but it misses at idle on cylinders 2 4 6 8 acording to the tech 2. if i unplug the fuel injectors while its running i can have it r... Trouble codes: P0300
1989 Chevrolet Blazer Silverado 5.7L Poor Fuel Economy, KNOCKING VIN: 1GNEV18K8K
truck knocks as going up hill, has a new egr valve, Ign Timing dose not change with timing wire ( black/gray) connected or disconnected.
1991 Chevrolet Camaro RS 5.0L Hesitation VIN: 1G1FP23E9M
Computer allows pulsing of new EGR, off idle. This causes slight hessitation. We disconnected electrical connector of EGR solenoid valve. Solenoid valve has no vaccuum leak to valve. There are no other vaccuum leaks from TBI, vaccuum booster, carbon cannister....
1997 Chevrolet Astro 4.3L Stall, MIL Lamp on VIN: 1GNDM19W8V
Van was towed to shop as no start. Customer says he was accelerating up a hill and heard a "pop" like sound from under the hood, van ran like it was flooding, then stalled. Would not restart. Checked for spark and fuel pressure, okay. Checked for codes , found... Trouble codes: P0108
1997 Chevrolet Astro 4.3L Cam sensor circuit VIN: 1GNDM19W3V
Hi All, I got this electrical is driving me up the wall! Replaced an alternator for customer,the following few days customer complianted that the Check Engine light is on. Pull a code and found cam sensor circuit malfunction. Fuse for the cam sensor is keep...
2000 Chevrolet Express 2500 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GTGG25R3Y
We have this van that has an intermittant rough/unstable idle. it has a history p0341 that returns ocasionally with a rough idle. then the idle returns to normal and every thing is fine again. i checked the archives and found nothing similar for this code. i s... Trouble codes: P0341
1996 GMC C1500 Suburban 5.7L MIL Lamp on VIN: 1GKEC16R5T
If you clear the code on this truck the MIL light will stay off for approx. 4 days and then it will come back on. Checked grounds and fuse as stated in the manual and they are fine. Any idea's? Thanks, Kerry Trouble codes: P0161
2001 GMC Sonoma SLS 4.3L No Four Wheel Drive high or low VIN: 1GTDT13W91
I'm comfused. The flow chart for code 2 tells you to turn key on disconect encoder motor and check terminals p,a,b,c, to ground. In Alldata the encoder termials are labled C1 C2 ect. I'm at a loss. The problem I'm haveing is the truck won't switch out of 2WD. ...
2004 GMC Yukon Denali 6.0L dash VIN: 1GKEK63U24
I have a problem with this Denali that when you turn the key on everythink works for about 30 sec to a minute then the gagues will drop to zero then rest and chime will sound once. This will continue as long as the key is on in the run position. Another proble...
1995 Oldsmobile Achieva S 2.3L Poor Idle Quality, Hesitation, Stall VIN: 1G3NL55D1S
Need some help down the right path with one. Maybe some GM techs have run into this?This is mainly a cold running problem, lack of power/hesitation after cold start and has intermittent stall.Idle after startup seems ok for about [...], then it may surge r...
1995 Oldsmobile Cutlass Supreme SL 3.1L Compressor VIN: 1G3WH52M0S
Hello Guys: Working in Miami we deal with A/C repairs pretty much all year round but I don't think I've ever seen a problem like the following. We replaced the compressor due to leakage (as well as the accumulator & the orifice tube--all new oem parts). Evacua...
1993 Pontiac Grand Am SE 3.3L No Start VIN: 1G2NE54N0P
hello iatn members hope that some one out there has seen this problem before. car came in on the hook from another shop as a no start, they had replaced the ecm, icm, and crank sensor still had a no start. when i started testing the systeem i noticed that the ... Trouble codes: 34 (mass air flow failure)
1995 Pontiac Firebird Trans Am 5.7L no start 1st crank VIN: NO VIN
This car has already left the shop. We have installed several performance upgrades. High Flow intake system, High flow MAF sensor, Headers and exhaust, MSD ignition system, Baer Brake system, Hotchkis Suspension, and a chipped ecu. Customer took it to a dyno, ...
2000 Saturn SL1 1.9L daytime running lights VIN: 1G8ZH5289Y
The daytime running lights flicker for about 10 seconds when starting vehicle then turn off. The dome light does not operate. Engine will start and die once almost every key cycle. The Tech2 will operate the DRL's and the dome light normally. There is a code B...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP52K9X
The fix first.A 65.00 wiring pigtail for the ignition module. Mike from Tx led us in the right direction. I reviewed everything we have done and started with the basics again. After performing a wiggle test on all connectors for the 10th time, with the vehicle...
2001 Buick Century Custom 3.1L abs VIN: 2G4WS52J01
Thanks to all who replied. Could not see any problems with harness near accumulator or transaxle without completely opening up harness so decided to replace harness to speed sensor. GM had replacement harness that was long enough to reach EBCM & wasn't to expe...
1987 Cadillac 3.0 3.0L Possible Body Control module VIN: WD6VR52RK9
First I like to thank the 3 guys who helped me out. My problem wound up being the Multi Functional Module. A couple of taps on it and the radio started to work. $65.00 part. thanks MP
1989 Cadillac DeVille 4.5L Body Control Module VIN: 1G6CD515K4
Steve from Florida nailed this one. Checking the 16v supply from the Body Control Module (BCC) showed only 4.5v. Unplugging the ECC allowed the voltage to return to normal and a sniff check confirmed that it had 'smoked'. Interestingly, the voltage regulator t...
1965 Chevrolet K20 350CID Model # VIN: K2545S1013
I have gotten a number of replies, and some Phone #s to call one for back east williams truck parts [...] found out that it is a Rockwell T221 also Kevin [...] from Ontario said he had a original shop manual and would copy it for me, now it is up to th...
1990 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, knock sensor (yes) VIN: 2GCFK29K4L
hello. to all well went back to basics and found my fuel presure gauge reading high (6psi) so actual fuel persure was really 6psi. installed pump and my lack of power is gone vech runs ok now.. as far as the knock sensor reading dont know what right or not.. s...
1994 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNEL19W5R
well just about all of you mentioned somthing about fuel but since he put an oem pump and injector and new lines we figured that the problem was else where but after exhasting all efforts we swapped new injector with known good one and problem is solved return...
1995 Chevrolet Blazer 4.3L engine VIN: 1GNDT13W8S
I want to thank everyone for their suggestions. I was told that the temp diff between the two heater core hoses should be no more than 12 to 15 degrees. So I measured them with my infared thermometer and the diff was about 60 degrees. After flushing out heater...
1999 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52MXX
Sorry for the delay. I had to wait for the customer to make arangements to get car back. Had it in a couple of days ago. Did not find any fuel in vacumn line to psi regulator. still no codes voltages to tps and map were in specs. What we did notice is if we op...
2000 Chevrolet S10 2.2L Hesitation, Cuts out, Misfire VIN: 1GCCS1952Y
Customer took the vehicle the following AM, and I was unable to proceed with much further diag. On the advice of others, I check the following items: 1) fuel volume - flowed 18 oz in about 20 seconds at idle, without affecting idle quality...I'd say that pas... Trouble codes: P0122 (tps), P0463.
2001 Oldsmobile Intrigue GX 3.5L head gaskets VIN: 1G3WH52H41
Many thanks to those who responded to our problem.Dennis from Iowa and Thomas from Michigian were right on about the flat bar stock. We went to our local hardware store and bought flat bar stock the correct thickness. You put the flat side on the back end of...
1995 Pontiac Sunfire SE 2.3L compressor VIN: 1G2JD12D25
thanks to all who took the time to reply. we did fix the problem, we replaced the instrument cluster it incorperates the body control module into it and it was not relaying the a/c request signal to the computer. we put it in and had to program the key to it b...
1997 Saturn SW2 1.9L MIL Lamp on VIN: 1G8ZJ8277V
Well, we have the vehicle back with the mil on again, this time only 1 code!! P0133 o2s voltage low, scoped uptstream o2, sure enough, hardly any switching at all right now. Replaced o2s, and we'll call it a fix. I also rechecked my grounds, and cleaned a few,...
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