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Prev Professional Automotive Repair Technical Discussions for January 23, 2007
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L Stall, MIL Lamp on
hello this vehicle runs fine most of the time, i got it to act up once w/ the maf unplugged the sft maxxed out & set the code at idle. i haven't been able to find any vacuum leaks.it seems to be electrical since it comes & goes at random.i have checked some gr... Trouble codes: P0171
2000 Buick LeSabre Custom 3.8L abs VIN: 1G4HR54K14
Customer came in with multiple dash lights on, abs,red brake light, traction control off, check tire pressure. The brakes stop normally, smooth and staight. The first time we looked at this I hooked up the mt2500 but my scanner only went up to '99 so was no he...
2003 Buick Rendezvous CX 3.4L abs VIN: 3G5DAO3E73
On our Genisys scanner we can see the unwarranted ABS/TCS activity and suspect the harness. What I would like to do is build my own[proper wire gauge]but Ive been told this is recipe for disaster???Driving this vehicle myself,Ive experienced unwarranted TCS wh...
1990 Chevrolet Camaro Iroc-Z 5.7L fuel control VIN: 1G1FP2388L
Trying to sort out the fuel control on this car. I'm finding excessive fuel delivery all of the time. Sensor readings are accurate. In an effort to establish a base line we ordered a factory prom to get away from the unknowns of the programmed chip. The troubl...
1994 Chevrolet K1500 5.7L wheel cylinder VIN: 1GTEK14KXR
This truck has us puzzled. In May of 2006 we replaced rear brake shoes, drums and wheel cylinders. Thought nothing of it, just an old work truck that needs a brake overhaul. Well six months and 13700 miles later when in for another service we noticed the left ...
1994 Chevrolet Astro 4.3L Hesitation, Surge VIN: 1GBEL19W7R
This vehicle has very poor acceleration from a stop. It seems worse when cold, or when ignition is turned off and re-started. No codes, lean o\2 sensor high B L \integrater, Injector pulse width widens with load. Fuel pressure responds ok. But we cannot find a...
1997 Chevrolet C1500 5.0L brake pedal VIN: 2GCE19M0V1
replaced leaking master cylinder. replaced leaking rear wheel cylinders. low pedal still. bled system, bled system, bled system. still low pedal. used tech 2 tool to cycle abs pump. bled system still low pedal. rear wheel cylinders will bleed 2 times with good...
1998 Chevrolet S10 2.2L Hesitation, Misfire VIN: 1GCCS1449W
This truck has a hesitation or misfire,most of time it happens in 5th gear cruising with light throttle.I can also make it happen if I lug it in 5th gear.It does not always act up.I thought it was a ignition misfire.I replaced the plugs and wires.It still miss...
1998 Chevrolet Monte Carlo Z34 3.8L Master Cylinder VIN: 2G1WX12K8W
This car has a soft pedal and the master cylinder needs replaced. The ABS motor pack bolts directly to the master cylinder and both master and abs have to be removed as one unit then seperated to replace the master. The repair proceedure says that you need to ...
1999 Chevrolet Silverado 1500 4.8L No Start VIN: 1GCEK19VOX
This truckis a no start. There is no spark and no rpm reading on scanner. I have no refference signal from computer to crank sensor. I have checked computer ground with scope for voltage drop . Only 180mv. With in specs. Before I replace computer is there anyt...
1999 Chevrolet C1500 Suburban 5.7L No Start VIN: 3GNEC16R4X
Customer called last weekend and said that his truck would not start. I told him I would be there the next morning. On my way to the shop he called and said that his truck was running. Yesterday he called, same problem. I got the truck towed here this morning,... Trouble codes: P1626 (VTD System), U1192 (testing and results)
2001 Chevrolet Express 1500 LS 5.0L No Start VIN: 1GNFG15M11
hey guys have a nitemare this van has fuel spark and pulse. backfires threw the intake and exhaust. like timing is out. turned dist while cranking and no change. replaced cam sensor still the same . no codes present. any help would be great.
1995 GMC K2500 Sierra SL 6.5L No Start VIN: 1GTGK29F0S
Thanks in advance for any help. We had this truck come in and the only problem this gentleman has is that the truck is hard to start when cold. We had changed the injector timing module for him and he was convinced that was the problem. We had a used one here ...
1999 GMC Jimmy SL 4.3L new wheel seed sensors VIN: 1GKDT13W2X
we followed the instructons laid out in the tsb, reguarding testing for ACmV and everyting is testing ok. we replaced the axel seals recenty and wheel hubs as well as wheel speed sensors, and already had everything apart. we can not find a reference for air ga...
1998 Oldsmobile Regency 3.8L ebcm VIN: 1G3HC52K2W
Thanks for any help in advance. I installed an injector on this car to fix a miss on cyl #1. Two days later customer comes back because the abs and traction off lights come on intermitnly. I test drive the vehical and get the lights to come on. When the lights...
1978 Other GM kit car 454CID Poor Idle Quality VIN: 1G6400100G
Hello to all... I have been pushing parts all my life and pride myself in being able to find parts that NAPA, CarQuest, Auto Zone, Advance and others can't. My Catalog Library is over 90' long and goes back into the early 1900's for some cars but this one has...
1996 Pontiac Grand Am GT 2.4L Excessive Emissions VIN: 1G2NW12T1T
Hi ; This vehicle fail NOx on Emission test,we replaced CAT,check for egr passage all good,EGR shows working on scanner. If you unplug the O2 sensor which make the car runs extremly rich and the NOx went down to 85,however,the HC went up to 109,and the CO we...
1998 Pontiac Grand Prix GTP 3.8L Cuts out VIN: 1G2WP1212W
hi everybody this pontiac apears to be over boosting. whith the charger belt off it works great. whem you gradually crowd it or stand in it it falls to pieces. no codes. it seems to be going way lean to the point of detonation. the regulator solinoid has been ...
2000 Pontiac Grand Prix GTP 3.8L whole car VIN: 1G2WR5212Y
Hey I need help with this one. When your driving the car i'm getting massive shuttering/vibrations throughout the vehicle not in the steering wheel only on right hand turns with acceleration going at least 30 mph not on left turns or straight aways. Has any bo...

Fixes & Summaries for GM
Fix/Summary Answers
1981 Chevrolet Corvette 5.7L head lamps VIN: 1G1AY8769B
Hi All, thanks to many the problem is solved.A special thanks to Richard from Arkansas for faxing me a diagram , he gave me his number I called him and had the fax in minutes. I also want to thank Gene from Texas , Thomas from New Jersey ,Bryan from Kansas ,Wi...
1990 Chevrolet C1500 Cheyenne 5.7L Misfire VIN: 1GTEC25KSL
We have checked this vehicles ignition, fuel, and emission systems to no avail. We suspect a leaking intake manifold (crack) between EGR passage and intake runner. Customer would not let us further investigate. They decided to trade vehicle in. Thank you for a...
1996 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3T
Hello fellow techs. Vehicle is fixed and customer states it never ran or started so good! Yippy! Like most of you techs suggested, the culprit was the fuel pump and sending unit. After posting our request and further testing on fuel pressure, we did notice flu...
1996 Chevrolet Lumina 3.1L speedometer VIN: 2G1WL52M7T
found speedo control unit and replaced. fixed speedo problem and car is fine. thanks for all the help.
1996 Chevrolet C1500 Cheyenne 5.7L convertor VIN: 1GCEC19R7T
Well, most of you folks hit it right on the nose. Upon teardown the input shell was broken, no clutches were burnt, but there was a lot of metal 'sludge' stuck to the magnet, and the TCC valve bore was worn out. As one suggested, I put in the .500 boost valve,...
1998 Chevrolet Blazer 4.3L security VIN: 1GNCT18W7W
Removed the lock cylinder and cleaned with brake clean, took apart connector C211 again unpinned the three wires going to passlock sensor checked crimp and terminal end. applied dielectric grease to connections, reassembled, cleared codes. vehicle seems to be ...
2003 Chevrolet Silverado 2500 6.0L radio VIN: 1GCHK29U83
Hi everybody, and thanks for your help. First of all, in my resquest, i forgot to mention that I used my Tech2 and TIS software to reprogram the remplacement BCM with the VIN of the truck. And the problem came after that.So I knew it was in relation with the B...
1991 Geo Tracker 1.6L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 2CNBJ18U6M
First, thanks to the people that offered to help with this little stinker. After many hours of staring at this vehicle with a confused expression on my face I finally figured a way to get this thing running better. The low voltage at terminals G1 and G7 was ca...
2002 GMC Sierra 1500 SL 5.3L recirculation door VIN: 2GTEK19T62
Well this truck has been fixed an oh what a fun time i had. I am the second person to work on this hair puller. Originally the first mechanic to work on it ordered the recirc motor based on vin number. When he got the motor it did not match what was in the tru...
1993 Pontiac Bonneville SE 3.8L Cuts out, Stall VIN: 1G2HZ52K9Z
Thank you so much everybody for your help on this crazy GM!I replaced the crank sensor and it seems ok for now.Really appreciate the help.-jay
1999 Pontiac Grand Prix SE 3.1L Stall VIN: 2FMN5SIOWT
this was what most people said hooked up scanner and test drove and found tcc sticking on after cruise installed new solonoied and car is fixed thanks everyone
2004 Pontiac Montana 3.4L park problem VIN: 1GMDX03E54
wow! thanks for all the great help! We replaced the crank arm assembly as alot of you suggested, retimed everything accordingly and it is working great.
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