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Prev Professional Automotive Repair Technical Discussions for June 22, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick LeSabre Custom 3.8L rear suspension VIN: 1G4HP52K2T
Customer said when driving car about 50-60 mph car seems to fish tale, I drove the car and confirmed (scary) I checked all suspension components all seem good struts are weak and should be changed but i feel it's not the problem it's like driving a car with a ...
1991 Cadillac Allante 4.5L SDD light VIN: 1G6VR3380M
Hello, I'm tring to turn the SDD light off by bypassing the system through the control panel. I have the sheet from g.m. that says to adjust the BCM override value "Bso8" but i dont know what number to put in for the value .I think someone has changed the orig...
1993 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G6CD53B8P
Vehicle runs fine until the HVAC system is turned on , As soon as the A/C compressor kicks in the idle speed drops and does not recover , the system voltage drops below 11 volts , the vehicles surges and misfires idle motor opens to compensate idle speed and t...
1986 Chevrolet K10 Custom 5.7L 3-4 gear VIN: 2GCEK14C7G
any one can help with this i dont gent into trans too much hope its somthing small, the org blew out the converter seal and it was slipping in 1st gear so i went to j yard and found one that looked like it was redone, pulled it ran good for three months, other...
1986 Chevrolet Camaro Z28 5.0L Excessive Emissions, Poor Idle Quality, Hard Start VIN: 1G1FP87F0G
This vehicle wants to start hard when cold and cut out intermitently. Temp and TP sensors check out ok, fuel pressure within specs. After new MAF it ran much better but still hard start. Customer says he smells gas everytime he parks back in the garage. It see...
1990 Chevrolet Corvette 5.7L compressor VIN: 1G1YY11JXK
A/C Inop, customer replaced control head, a/c coolant fan switch, pcm. A/c compressor engages when coolant fan pressure switch is disconnected. will not engage when connected, but coolant fan turns on when a/c is requested at control.
1995 Chevrolet S10 2.2L Pilot bushing
Doing a regular old clutch replacement job due to mileage concern, no problems. My question is there does not appear to be a pilot bushing at all in the crank. How can this be? I am ready to install one but dont know how deep to sink it due to the non existenc...
1997 Chevrolet Express 2500 5.0L Excessive Emissions, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCFG25M8V
P0300B..MISSFIRE DETECTED .this vehicle came in with a missfire and white smoke coming out tailpipe gas fumes from unburnt fuel .it is overfueling #8 cyl bad #2and #4 also have a miss detected . o2 sensors stay in rich position .long and short term fuel trim a...
1998 Chevrolet K1500 Cheyenne 5.0L Misfire, MIL Lamp on VIN: 2GCEK19M2W
truck misses at light load or pulling trailer under light load on #7 and #2 can duplicate it in 2nd gear at about 2000 rpm, all scan tool data is good not running lean or rich as far as i can tell with one cyl missing on each bank, fuel trim is at the most +6.... Trouble codes: P0300
1999 Chevrolet Malibu LS 3.1L No Start, Stall, MIL Lamp on VIN: 1G1NE52M8X
Vehicle came in for intermittent stall. Checked codes, found P1626 and U1016. Checked battery connections, tested power and grounds at computer and checked connector-ok. Replaced computer per Alldata flow chart. Vehicle seemed fixed. Came back about 2 weeks la... Trouble codes: P1626 (theft deterent fuel enable signal lost), U2001 (invalid ipc transmitted spi data), U2003 (spi data-in high), U2004 (spi data-out low), U2006 (spi clock-out low), U1016 (loss of communication with pcm)
1995 Geo Metro 1.3L Heater Core VIN: 2C1MR5297S
This customer brought in her car about 18 months ago. She had just recently purchased the car. She was told when she bought the car that it needed a heater core. The heater core had been disconnected and by-passed. So I replaced the heater core. Before i put t...
1996 GMC C3500 Sierra SL 5.7L Stall VIN: 1GDJC34R5T
this is a dual tank system, rear tank being auxilary, front is main. i will give a brief explination of how this dual tank system works. fuel pump module located just in front of main tank controls transfer pump(located on frame between tanks) operation, when ...
1996 GMC C1500 Sierra SL 4.3L MIL Lamp on VIN: 1GTEC14WXT
At present the issue is bank 1. Looking at mastertec waveform bank 2 is swinging fine- tho has had issues in the past. When a new AC Delco sensor is installed it also looks fine, but 100+ miles & it looks crappy again like something is killing the sensor/s ? W... Trouble codes: P1133 (Bank 1 O2 sensor insufficient switching), P1153 (Bank 2 O2 sensor insufficient switching)
1996 Oldsmobile 88 Royale 3.8L fuel gauge VIN: 1G3HN52KXT
This is a good one for G.M techs.sorry its a long one. we had this car come in for a leak in the fuel tank area and thought we would change the send unit because the lines very rusty. After filling up car gauge would only read 1/4 tank and stick there. gauge ...
1965 Pontiac GTO 389CID steering wheel removal VIN: 237675K101
Hey guys, I hope someone can help me. I'm trying to replace horn button but I have no idea how to get the steering wheel button off. I tried pushing in and turning, prying it off with excessive force which is difficult without damaging anything( showroom condi...
1998 Saturn SC1 1.9L MIL Lamp on VIN: 1G8ZE1287W
Thanks for reading this post. This saturn came in with the engine melted down. We installed a salvage engine it runs well but i keep getting a code po241 cmp sensor out of range My solus has no troubleshooter for this code. And i am at a loss. Trouble codes: P0341
2004 Saturn Vue Red Line 2.2L No Start VIN: 5GZCZ23D34
scanned ecu--no codes but scan data shows 8.9 battery volts-checked voltages and grounds(voltage drop and ohms) --am I missing something? otherwise thinking ecu bad---what genius at Saturn engineering thought that mounting an ecu on the intake manifold is a go...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Regal LS 3.8L dome lites VIN: 1GT1HFGSKO
trace problem to shorted relay inside bcm, however customer did not want to buy the 300 plus dallar part so what i did was jump the two in and out solid orange wires. and called a day,only fall back was vehicle no longer had theater dimming cause that was on a...
2004 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K34
Wow! everyone had great ideas. I have verified that both the purge valve and the vent valve are operating correctly (right now anyways). I took most of your advice and changed the fuel cap - less than 20 bucks. If it comes back, I'll keep you posted. Thank... Trouble codes: P0442.
1998 Cadillac Seville STS 4.6L Guages VIN: 1G6KY5498W
Thanks for all the replies. After chasing every possible leads. We started eliminating possible sources, we removed the suspension control module & condition with gauges went away. Then while reinstalling module the fuse blew for frt suspension. After further ...
2002 Cadillac DeVille 4.6L convertor VIN: 1G6KD54Y82
Thanks for all the suggestions, some were quite astute and had value. Unfortunatly, the customer had become impatient with our attempts to isolate the problem and has taken the car away, along with a refund for a torque convertor and control solenoid. No matt...
1988 Chevrolet Camaro 2.8L Blows coil VIN: 1G1FP21SOJ
Several of you hit the nail on the head. The tach wire had a worn spot were it went through the fire wall and was shorting out. Thanks for all the help.
1998 Chevrolet S10 LS 4.3L won't slow down VIN: 1GCCS19X6W
To sum up this vehicles problems it turned out that it has transmission problems causing it to do what it was,I checked for vacuum leaks none found also changed out the EGR valve & that didn't help.the last thing done was to update the VCM with the latest upda...
2003 Chevrolet Avalanche 1500 5.3L Ring Gear VIN: 3GNEK13593
Well he dos not want to fix this the right way he wants to sell it going to put some new bolts in it and off he goos not how i would have like that one to go it would have been a nice swap and a set of cosom axl was as esy as calling strang or summit o w...
2003 GMC Envoy SLT 4.2L Mode Door Motor VIN: 1GKDS13S23
Well ladies and gentlemen... once again i was burned by assumption. Having never seen this problem before, I assumed that when both vehicles exhibited the same symptoms following a simple battery switch, that i had some type of calibration error rather than a ...
2005 GMC Yukon Denali 6.0L ride control VIN: 1GKFF66U65
yes. thank very much for the information. i replace the whole compressor , it take care the ride control . thank very much . this site is really help when no place to turn. thank you again
1999 Oldsmobile 88 Royale 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3HN52K7X
Thanks for the replies, turned out a small leak coolant leak inside the intake manifold was the fault. Customer didn't want to fix the problem, however when cooling system was presure up the plastic intake started to give and coolant would come out the thrott... Trouble codes: 0300 (misfire).
1991 Pontiac Sunbird LE 2.0L No Start, Poor Idle Quality VIN: 1G2JB54K7M
THANKS TO ALLLLLLLL 1 of you who replied, I tested all the basics before asking for help and was unable to pinpoint due to the intermittant nature of this failure but where the engine harness runs over the bracket at right side blower motor, the bracket is squ...
1999 Pontiac Grand Am SE 3.4L power steering pump
thanks for the back-up guys...with more proof went over there(while he was at work today)and threw another pump on it and problem solved...thanks again
2000 Pontiac Grand Prix SE 3.1L tachometer VIN: 1G2WJ52J2Y
the first reply was good and i liked it because it gave me a very detailed set of instructions to follow. the problem was that i was getting no signal from any thing but i think i was getting voltage from the cluster. i liked the second post because it gave a ...
2001 Pontiac Grand Am SE 3.4L No Start, Stall VIN: 1G2NF52E72
Thanks for all the replies and thanks to michel for hitting the nail on the head. I checked the bcm for powers and grounds and was missing a power on the ipc fuse on the drivers fuse box. I checked the fuse again and it still wasnt blown. I checked purple wire... Trouble codes: U1064 (Loss of bcmvtd data), P1626 (Theft system enable lost).
2001 Pontiac Grand Prix SE 3.1L Electronic VIN: 1G2WK52JX2
We had to give up on this one. The customer needed the vehicle every day. Would come buy for a few minutes when she had time and haven't seen or heard from her in days. Thanks for all the help.
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