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Prev Professional Automotive Repair Technical Discussions for March 16, 2007
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1984 Cadillac Eldorado 4.1L charging VIN: 1G6AL5786E
this car came in not charging.customer said driving down the road everything would slowly stop working then the car would die and have to be jumped to restart.after testing the alternator it was found that it wasnt putting anything out amps or had a n...
1991 Chevrolet Tracker 1.6L No Start, Cuts out VIN: 2CNBJ18V0M
customer compliant engine was cutting out/stumbling while driving at any speeds. we performed the repairs listed below and vehicle was fine for 2or 3 days and now has intermittant no start and stumble/stalling with black smoke from tail pipe. problem is we hav...
1998 Chevrolet K1500 Cheyenne 5.7L converter shift flair VIN: 1GCEK19R5W
Hi guys this is my personal truck and this has been occuring on and off for awhile fluid color and ocndition are good. shifts are ok and problem only existis once engine temp warms up 160f plus. while driving in 4th gear any where from 40-65mph it appears the ...
2000 Chevrolet Lumina 3.1L air bag VIN: 2G1WL52J1Y
this car came in with the air bag light on.code b1015 was set . we cleared it per service manual and check pass. side connections . now light flashes seven times then stays on steady. all data in data stream appears to be in range,except the trouble tree ask t...
2001 Chevrolet Blazer LS 4.3L Starting VIN: 1GKCS18W61
vehicle came in would not shut off. we were told that another shop just installed the ignition switch for the same problem. We took covers off to inspect. Turn key off, still runs tap on turn signal switch, turns off. ses light on and off while tapping??? Anyo...
1995 Geo Tracker LSi 1.6L timing comp. VIN: 2CNBJ1862S
i am having a problem setting up the timing belt correctly. using info. from both mitchell and alldata the vehicle won't start and backfires occasionally. one repair procedure says to set the belt up with number four cylinder at tdc and another says to set it ...
2003 GMC Envoy XL SLE 4.2L Stall VIN: 1GKET16S33
customer complaint, dies cornering at slow speeds. test drove, did not die. customer said it dies at anytime. scan checked , all systems working properly at that time. tested fuel pump, tested o.k. 3 codes found , none should cause dying problem. vehile starts... Trouble codes: P0172, P0340
2004 GMC Envoy XUV SLT 4.2L Hesitation, MIL Lamp on, LACK OF POWER VIN: 1GKET12S64
vehicle lacks power and proper shift under load. no trans codes present. can manually shift vehicle into gear ranges without loss of power. transmission does not slip. in neutral engine revs normally without hesitation or other felt problems. no vacuum, electr... Trouble codes: 0171 (system lean bank 1), 1133 (insufficient switching b1s1), 1171 (system lean during decel), 0172 (system too rich)
2001 Oldsmobile Alero GL 3.4L Poor Idle Quality, Surge, Stall, Misfire VIN: 1G3NL12E51
Vehicle runs poor after sitting. Runs poor for 1-3 minutes. Seems to be loaded up, smokes from tail pipe. Have checked fuel pressure regulator, fuel pressure, ignition system, swapped plugs, swapped injectors, checked for Hc in cooling system. Smoke from tail ...
1996 Pontiac Firebird Formula 5.7L no Acceleration VIN: 2G2FV32P9T
This vehicle is equipped with a throttle limiting device. I have been unable to find any information on diagnostics for this system. Alldata calls the unit a throttle relaxer and Mitchel calls it a Throttle actuator. The vehicle was towed in because when you d...
2000 Pontiac Sunfire GT 2.4L MIL Lamp on VIN: 1G2JD12T7Y
this car has an intermittent code p0122 tps low voltage and the trans shifts really hard from first to second gear. on start up the idle goes up to around 3,000 rpm and stays there. i can control the rpm with the scanner but if i shut the scanner off the rpm's... Trouble codes: P0122 (tps voltage low)
2001 Pontiac Bonneville SE 3.8L Surge, Stall VIN: 1G2HX54K51
has stall at idle or when surges about 200 rpm up and down at idle and when you stop it will stall.checked 3x and 18x sensors as well as various other sensors with modis while stall happens looks all ok.c leaned maf and manually tested map ...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac Escalade 5.3L Alignment VIN: 1GYEC63TX3
I received an astonishing 21 replies. About 19% asked for more info - the alignment specs in particular. My apologies for not posting them originally. It was late, and I was beat up by that time, so a hasty posting job was done. Sorry. 8% were split evenly bet...
1993 Chevrolet K1500 Cheyenne 5.7L brakes VIN: 1GCEK14K4P
Thanks forall thehelp and sugestions.After trying everyones idea with no luck I put the truck back together so I could work on somthing else and take a break from this thing.While driving truck out I tried Mark from alberta's sugestion and 'stood' on the brake...
1994 Chevrolet K1500 5.7L possible transfer case VIN: 2GCEK19K0R this point I still have not come up with a conclusion. I can say this. It is not the tires or ratio. I am going to remove the front driveshaft and recheck this noise. I got this idea when a Yukon came in this week with the rear end in pieces. The cus...
1998 Chevrolet Blazer 4.3L gauges,warning lights VIN: 1GNDT13W4W
80% of the responses I got suggested replacing the ignition switch.I also found a tsb addressing an ignition switch problem.I had already cleaned all the ground connections and the pos connections.I informed the customer that I would like to try the switch,but...
2000 Chevrolet Tahoe 5.3L Dome lamps, compass/temperature display VIN: 1GNEK13291
Thanks for all the replies. After searching for broken wires, I finally found the plug in the junction box underneath the drivers side dash was just barely hanging out to where it wouldn't make contact. I plugged it back in and everything is working again.
2000 Chevrolet Express 3500 LS 5.7L No Start, Stall VIN: 1GBJG31R4Y
Well the van is burning gas again, thank you for your assistance. I did replace the VCM, and after I did it still would not start! However I did get a back fire, so I was getting fuel again. I found later, and I probably should have checked this a couple of da...
2003 Chevrolet Silverado 3500 6.6L no compressor operation VIN: 1GCJK33173
Thanks for taking the time to reply. Several suggested low pressure switch which was the problem. All the test procedures for no compressor operation begin with scan tool communication and since we could not communicate with the hvac module we suggested taking...
1998 GMC K2500 Sierra SL 5.7L No Start VIN: 1GTGK29R2W
Most people were right - it was fuel pump. The odd thing was, if we brought it inside and it sat for an hour, then it started. But, if left out side overnight when it was cold, then it would not start in the cold. Because it has been warm lately, we had to wai...
1993 Pontiac Grand Am SE 3.3L Poor Idle Quality, Surge, Stall, Poor Fuel Economy VIN: 1G2NE14N5P
Many thanks to those of you who offered suggestions, Andrew from Wisconsin, Patrick from Ill, Mark from Minn., Michael from Ca, Reno from Co, Pete from Ontario, and Bill from Ill. The fix was a combination of bad parts and inept prior maintenance and repair....
1999 Pontiac Grand Am SE 3.4L Stall, MIL Lamp on VIN: 1G2NE52E3X
im calling this one fixed. first of all, the vac reading was 18in not 23. tried a different gauge and threw the other one in the trash. everything we tried/tested came out normal with no effects to LTFT. only thing that made a difference was adding 5 gals of g... Trouble codes: P0172.
2003 Pontiac Aztek 3.4L Fuel & Temp VIN: 3G7DA03E43
Sent original instrument cluster to SPECMO [...]} in Madison Heights, MI. Cluster came back today and all is well. No ABS on vehicle was problem with GM's replacement, even though part numbers matched. Thanks to all. Darold said try United Radio 800-44...
2003 Pontiac Montana 3.4L No Start, MIL Lamp on VIN: 1GNDX03E63
thanks for the help! the problem was a broken crank sensor signal wire at the ECM harness (green wire). It was a 'lucky' find. We just started wiggling the ECM harness out of curiousity because we had already checked the sensor harness. By touching the wires t... Trouble codes: P0336 (24x ckp sensor fault).
2001 Saturn L200 2.2L Power steering pump VIN: 1G8JU54F21
Thanks for the replies. I knew it would be something strange. After pulling the reservoir to look for cracks (no leaks were present)my brother noticed something inside the fluid inlet, the tube with the o-ring, this section is separated form the main fluid hol...
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