GM Automotive Technicians Technical Discussion and Fixes for Apr 12, 2007

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Open Help Requests for GM

	Help Request	Answers
	2000 Buick LeSabre Custom 3.8L abs VIN: IG4HP54K4Y need help. driving down the road around 55mph you hit the brakes the the ABS motor kick in and the pedal moves checked wheel sensors on sscan tool and the all stay at the same speed that your going. also on the scan tool the ABS relay is comanded on when the p...	View
	1998 Cadillac Seville SLS 4.6L engine VIN: 1G6KS54Y6W I'm questioning that blown head gasket gasket diagnosis. No typical head gasket symptoms...no smoke, no misses, no excessive pressure in cooling system,no codes, a slight trace of HC in the reservoir - low teens ppm. Our testing finds that this car will sit an...	View
	2000 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KEE57Y1 How do you Caddy guy,s live with these cars. Help!!! Since replacing both crank sensors it set two new codes po 412 418 air injection system, I don't think it has one, the fuses were missing and I can't find a pump. Puting in fuses made no differance. We did r... Trouble codes: P0412, P0418	View
	2003 Cadillac CTS 3.2L Oil Pan VIN: 1G6DM57NX3 HELP! I have a confirmed oil leak from the RF corner of the oil pan, confirmed by cleaning the excessive oil from the lower area of the vehicle, adding engine oil dye and inspecting with a black light. I have two questions on this one; 1. Has anyone had this ...	View
	1989 Chevrolet Sprint 1.0L Cuts out VIN: JG1MT2162K I'm trying to find a problem that only happens once a week to as often as three times a day. Customer says car simply quits, while driving or when idling at a light. It refuses to restart sometimes until the next day, sometimes it restarts right away. The only... Trouble codes: 13 (O2 sensor circuit open or shorted)	View
	1995 Chevrolet Camaro Z28 5.7L asr off light on VIN: 2G1FP32P1S Dear fellow techs, I needs some guidance with a 95 Camaro with the ASR off light on. We worked on this car a couple of months ago and the customer stated that the ASR light has been on ever since. Alldata has little information on this setup. I called our loc...	View
	1995 Chevrolet Cavalier 2.2L Fuel leak VIN: 1G1JF52475 Car came in with lots of fuel pouring out of the vent elbow on the evap canister in the inner fender . This was two days after another shop had replaced two cracked injectors . Customer said it was not leaking like this before . We have never had a problem lik...	View
	1995 Chevrolet S10 LS 4.3L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCCS19Z3S The vehicle had a int. no power/stall. The customer changed IAC, TPS, O2, no change. I pluged in my scan tool (Mastertech) and noticed iregular data stream, like system voltage droping to 2.4v or a RPM reeding of 99999, and code 55 amoung others. I checked all... Trouble codes: P0171 (Exaust Lean), P0300 (Random Missfire)	View
	1998 Chevrolet Venture 3.4L No Start VIN: 1GNDX03E3W vehicle towed from other shop not running, ckd fuel pressure within factory spec, checked for spark good, checked for injector pulse as best as we could with out removing intake none detected. spray combustable in intake engine will run. check modis trouble s...	View
	2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J81 This car was sent to us with a no start condition. We traced it out and found no pulsing at the injectors. We then found that the Theft System light was blinking. At this time we read up on the procedure for the anti-theft system to relearn. The procedure list...	View
	2003 Chevrolet Express 2500 6.0L coolant in oil VIN: 1GCDG25UX3 went to change vehicles oil and noticed it looked like a chocolate milkshake. i also noticed that if i look through the throttle body i could see the same sludge in the intake, so my question is could this be like the 3800 motors that leak antifreeze from arou...	View
	2005 Chevrolet Impala 3.4L Starting VIN: 2G1WF52E55 Customer purchased this vehicle at an auction.Was running at the time.Does not crank.No codes.I think it may be related to the passlock system.Anyone ever bypass one?Any help would be appreciated.Bruce	View
	2005 Chevrolet Silverado 3500 6.6L Hesitation, Cuts out VIN: GDE4E3205F Hi iatn members i have a chevy c4500 that goes into limp mode or governed mode after driving for a while i vacume tested the fuel pump inlet side 4 inchs idle 8 to 10.5 wot the frp readings to act frp stay the same in graph mode on my modis runing down the roa... Trouble codes: 1093 (fuel pressure low on power enrich)	View
	1975 GMC Pick Up 5.7L Electrical Question VIN: 1457896541 This not a problem car, it's a techincal question someone ask me and don't have a answer. This is the question, If I connect a test light too the battery positive and touch the radiator hose with the probe end, the test light comes on. At first when I heard ...	View
	1998 Oldsmobile Intrigue 3.8L Hesitation, Stall, MIL Lamp on VIN: 1G3WH52K5W hi everybody : Customer complaint the engine will surge after start-up at idle,sometimes will stall out and MIL came on. Quick check for codes and found p1626 theft system fuel enable signal lost and the freeze frame data is shown : coolant temp = 200 F RP... Trouble codes: P1626	View
	1999 Oldsmobile Aurora 4.0L Misfire VIN: 1G3GR62C3X This Olds is missfiring under a load, or while accelerating. Scanner shows #1 and #2 both missfiring under power stall condition, or accelerating. I have also checked for vaccum leak have not found one yet. This thing has no codes. If anyone can help please em...	View
	1986 Pontiac Fiero GT 2.8L alternator VIN: 1G2PG9793G Alternator not charging. This should be simple but for some reason the logical explination escapes me. This vehicle originally came in for a valve job. After getting everything put back together the engine does not idle well, is very sluggish and the alternato...	View
	2000 Pontiac Bonneville SE 3.8L steering VIN: 1G2HX54K8Y hello everyone the bonny is kicking my tail, costomer had car to other shop for vibration from 40 to 55 mph they sold him new front tires, outer tierods and an alighnment, did not fix car, he then brought car to are shop where we found belts slipped in left re...	View
	2002 Pontiac Aztek 3.4L Passlock/BCM VIN: 3G7DA03E42 Car came in on the hook. Customer complained of not being able to start or crank the car. Customer also stated key would not come out of lock cylinder. When key is turned to on position, mileage appears and then ERROR message displays. Car will allow gearshif...	View
	2006 Pontiac G6 2.4L warning light VIN: 1G2ZF55BX6 hi everybody,thanks in advance and thanks for previous help. this car came to me from a body shop that restores salvaged wrecks. it was hit in the front and the drivers air bag deployed. thhre were no passengers so passenger air bag didn`t. the owner replaced ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Cadillac Eldorado 4.9L starting VIN: 1G6EL13B7N thanks to all tech. responded , those replies were very helpfull. problem was bad rodbearing . owner ask to put another engine in the car and get done with it. thanks again matt	14
	1998 Cadillac Seville SLS 4.6L various VIN: 1G6KS54Y4W thanks guys for your replies! with my short finder I was able to trace where the loom went up through the dash, under the upper dash pad, across to the driver side of the dash then down the drivers side to where it runs behind a panel next to the e-brake pedal...	4
	2000 Cadillac DeVille 4.6L alternator VIN: 1G6KD54Y4Y Although the alternator would put out over 100 amps it would not charge more than 11.9 volts. I read some replys that said 12 volts was good on this vehicle but it let the battery run down over time. The alternator was replaced again and it charges fine at 14 ...	9
	1988 Chevrolet K1500 Cheyenne 5.7L Coolant reservoir VIN: 1GCDK14KXJ Thanks for all the diagnostic tips. I believe the trans cooler was the culprit. The engine oil was clean, but the trans was murky. The customer said he had the trans serviced recently and the fluid just looked too dirty to me. I also pulled the intake just to ...	34
	1990 Chevrolet Lumina 3.1L Hesitation, Cuts out, Stall VIN: 2G1WL54T0L first of all thank everyone who responded i took this job over from another tech here not to say i would have went differently but i found out that i didn't have a 5 volt reference at the tps or map so i went hunting i disconnected the a/c high preasure switch... Trouble codes: 35 (idle air control).	22
	1997 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JC1246V Well guys i hate to do this but im going to have to close this one for now here is the info...I received alot of help on this one and i double checked all that was suggested, compression, leak down cylinders, swapped all ignition parts with known good off of a...	32
	2003 Chevrolet Malibu LS 3.1L Fuel gauge, electric windows, doorlocks, interior VIN: 1G1NE52JX3 Hi Group, I am closing this post, as I said before this problem occured intermittently perhaps once or twice every 1000kms drive. As many of you mentionned to check the ignition switch and to check for codes which I did. Found nothing wrong in those areas, one...	15
	2004 Chevrolet Silverado 1500 4.8L cannot fuel vehicle got many thoughtful replies. most suggested evap vent lies and such. i replaced the tank, and now this truck accepts fuel normally. the only difference between the new and old tanks was the 4 fins above the rollover ck valve had been damaged by the customer wh... Trouble codes: P0446.	12
	1996 GMC Sonoma SLE 4.3L transfer case VIN: 1GTDT19W6T Thank you to everyone who replied. After checking for corrosion isssues and doing available flow charts found that the encoder motor was bad but also could not shift the t-case manualy. The truck is now at the tranny shop and is getting repaired, I will talk w...	17
	1999 GMC Safari SL 4.3L speedometer/odometer VIN: 1GTDM19W7X The 2 problems were not inter-related; though they both involved bad wiring. (1) Re-the speedometer/odometer, the solution was simply fixing the 'open' in the dark green wire (Pin 4 on Black Connector of the PCM to Pin B14 on IPC. The wire was broken within th...	5
	2003 GMC Sierra 1500 SLE 5.3L braking capacity VIN: 1GTEK19T73 Even though the braking still leaves something to be desired, I changed the pads to a cheaper grade with a more agressive friction material and installed steel braded lines and they are at least 20 - 30% better. I have the feeling that I may have to put up wit...	7
	2003 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GKFK16Z03 after all the help from you guys we figured out it was the passenger side cat was clogged causing the right bank to misfire and giving us the rough idle and low compression. we replaced the entire y pipe assembly since the previous running problem most likely ... Trouble codes: P0300 (random misfire).	19
	2003 GMC Top Kick 7.2L ABS Light Thanks very much for your feedback. The fix was a new Bendix EBCM, just as instructed by the pinpoint test. This can be somewhat confusing, as this model has both the ATA Deutsch 1708 and OBD II DLC. So what to use? Both, as it turns out. Use the Tech II to co...	3
	1996 Oldsmobile Cutlass Ciera 3.1L Cuts out VIN: 1G3AJ55M5T gentlemen, thanks for the help on this one. it turns out that the wire in the top of the sender has corroded where it wasn't making good contact. too bad the tech missed it. could have saved him lots of time. a new sender has fixed the problem and customer is ...	12
	1993 Pontiac Grand Prix LE 3.1L Hesitation, Cuts out VIN: 1G2WH54T2P the grand prix was fixed!!! thanks to all who sent suggestions. it was a broken ground wire as so many of you suggested. i appreciate the help.	8
	1998 Pontiac Bonneville SE 3.8L Suspension VIN: 1G2HX52K8W Thanks for all the help! Couple guys said check bumpsteer and hit the nail on the head. Someone at one time has curbed this car and bent the mount where the rack sits! The rack set a half inch higher on the right side. Fixed that went and drove car and drives ...	18
	1999 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB1241X its fixed found a pulled wire under the fuel rail that was dropping voltage. and this was done by the installer thatb put this motor in.thanks to all just goes to show that all can check out good put still have a problem check for ove stretched wiring.. Trouble codes: P0107 (map signal low).	4
	2001 Pontiac Bonneville SE 3.8L rf wheel VIN: 1G2HX54KX1 Sorry for such along delay, the problem has been resolved. the passenger side was bad 1st time around the second time people started telling me to look at the other wheel. Because GM's for some reason the computer says RF wheel they mean LF when you in the dri...	13

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