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Prev Professional Automotive Repair Technical Discussions for August 29, 2012
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L No Start VIN: 3G5DB03E82
Vehicle came in for crank no start. I have 37 lbs. of fuel pressure.very good spark on all cylinders. I have no injector pulses. I have 12 volts to all injectors i can fire all them with a scan tool they all drop equal amounts of pressure when fired. Tps data ...
1987 Chevrolet R10 Custom Deluxe 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCER14H6H
Hello fellow techs, this truck came in with all the above parts installed as the customer played swaptronics with his truck.The truck runs extremly poorly, is very hard to start the smell from the exhaust will burn your eyes when it's running,and it won't idle...
1999 Chevrolet S10 2.2L SIR system VIN: 1GCCS1440X
I have recently replaced the IPC in the truck, upon turning the key to the run position, i noticed that the airbag light flashed & times, and remained illuminated. I do not know whether the light was on prior to IPC replacement, so i do not know if they are re...
2001 Chevrolet Express 3500 5.7L Doesn't start VIN: 1GAHG39R11
Van got towed to my shop, turns over but no start. It had new fuel pump put in somewhere else. The pump connecter was updated . It has spark no fuel pump pulse, all the circuits and grounds looked okay No trouble codes, the battery was dead when it came in. Af...
2004 Chevrolet Epica LS 2.5L No Spark VIN: KL1VB52L24
Vehicle will not start, no spark, power to coils, no coil trigger from pcm
2005 Chevrolet Silverado 1500 LS 5.3L Excessive Emissions, Poor Idle Quality, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2GCEK13T25
The customer was on a road trip and the transmission went out. So he had a reman trans installed, when he got the truck back the check engine light was on. He said that the had never been on, he told the guy at the shop he "scanned" it and they told him that i... Trouble codes: P0171, P0174, P0300, P0131, P0138, P0158
1998 GMC K1500 Sierra SL 5.7L Poor Idle Quality VIN: 2GTEK19R8W
This vehicle originally was towed in as a cranking no-start. Tests showed spark from ignition coil was present, but very weak. Scope test of coil primary circuit indicated good waveform with 7 amps draw and normal rise. Replaced the coil, cap, and rotor togeth...
2000 Pontiac Bonneville SE 3.8L No Start, MIL Lamp on VIN: 1G2HX54K8Y
Hello GM Techs...got a tough one here. Intermittenly car cranks and fires up, runs for about 5 seconds really rough and MIL flashes fast while running then sputters and dies. Sets code p1626-Theft Deterrent Fuel Enable Signal Lost...passed/failed on tech2. but... Trouble codes: P1626 (Theft Deterrent Fuel Enable Signal Lost)
2003 Pontiac Bonneville SE 3.8L Cuts out, MIL Lamp on VIN: 1G2HX52K93
The car will stall as you slow down to make a stop or a turn have checked for 5v to each sensor have good voltage also tested for voltage at map sensor with scanner when i unplugged map sensor scanner still show voltage disconnected the signal wire for map to ... Trouble codes: P0101, P0121, P0108
2006 Pontiac Montana SV6 3.5L all wheel drive VIN: 1GMDX33L16
06 pontiac came in for low power and poor shifting and awd inop found pluged cat and has good power and shifts good awd is still disabled. disabled for high fluid temp. the trans fluid temp is reading at 127 deg F with a tech 2. after short drive and sitting i...
2004 Saturn Ion-3 2.2L radio VIN: 1G8AL52F94
thanks in advance for any help on this.we replaced the battery in this ion today,and realized that there was no card in the glove box w/the radio code.called my local gm dealer parts dept,who talked me through the procedure to get the radio to output a 4-digit...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Century Special 3.3L No Start VIN: 1G4AG55N7P
Yes it's fixed. I want to thank all who replied, the information was very useful. I installed a factory PCM and it still didn't start. I knew I had fuel,fire, and injector pulse. Someone mentioned checking tps volts and coolant. they both seemed fine. So I unp...
1976 Chevrolet Corvette Stingray 5.7L Brake VIN: 1Z37L6S436
1990 Chevrolet Corvette 5.7L No Start, Poor Idle Quality, Surge, Stall VIN: 1G1YY2389L
hey folks, what ended up being the problem is three bad injectors. mitchell ondemand states the ohms for the injectors was 7.5. anothertech from this site stated that the resistance should be over 15 ohms and i also confirmed this on a another site and of coar...
2000 Chevrolet C3500 6.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GBKC34F3Y
hi guys,i appreciate all of the great tips and advice from the great group we have here.unfortunatly i was not able to repair this beast because the owners decided that they we just not going to continue in the towing end of the buisness anymore,just not worth... Trouble codes: P0251, P0215, P0219, P1216, P1218.
2002 Chevrolet Trailblazer LS 4.2L Cuts out, MIL Lamp on VIN: 1GNDT13S02
Lot of valid replies. The one that appears to be the fix was from Steven. Good info all the away around. I replaced the sensor with OEM. We have driven the vehicle for more than a week without incident. I still beleive in aftermarket parts but i also learn thr... Trouble codes: P1271, P1275, P1280.
2005 Chevrolet Malibu 2.2L Starting VIN: 1G1ZS52F75
A huge thanks to every one that replied 6 in all. It turn out to be the BCM. The acc. circut was shorted to ground inside the BCM. New BCM and program and all is well. Thanks again. Ron
2005 Chevrolet Silverado 3500 6.6L MIL Lamp on, Hard Start at Times VIN: 1GBJK39215
Thanks for all the replies. I replaced Cylinder #1 and #3 fuel injectors and it appears to have fixed the power problem and the hard starts! Thanks for eveyones help!!! Trouble codes: P1093 (Fuel Pressure Low During Power Enrichment).
2007 Chevrolet Equinox LT 3.4L light on intermittantly VIN: 2CNDL63F97
We spoke with the customer about checking harnesses for problems but customer has decided to live with light since it only comes on intermittantly & doesn't really cause any driveability issues. Thanks for the help-maybe we'll get to fix the next one David Lee
2007 Chevrolet Suburban 1500 LT 5.3L Rear Liftgate VIN: 3GNFC16097
Problem solved! No need to get high tech on this one! Craig, Rodger and John, Thanks! A new set of struts took all the stress off the liftgate motor, and all works fine!
2008 Chevrolet Colorado LT 3.7L Front Tired Pressure Sensors VIN: 1GCCS39E78
here it is guys, after taking this veh to a friends shop (where he has a tech II) we were able to find that the left front (napa sensor) was telling the computer it only had 17 lbs of air pressure and that the right rear (factory sensor) had a bad battery. so...
2003 Hummer H2 6.0L front diff rubber mounts VIN: 5GRGN23UX3
There are no bushings available for this vehicle. The 2500hd chevy parts do not work. We found loose bolts and worn bushings but were able to tighten evything up. We still had a problem with binding and popping from the front end. We have sent the T case back ...
1998 Saturn SL2 1.9L Surge VIN: 1G8ZK5279W
We checked exhaust back pressure but that seemed to be fine, took another stab at EGR ports but again the are flowing freely. Still with the EGR plugged in the surge comes back, with it unhooked car runs fine. Customer declined any more testing & decided to li...
2002 Saturn Vue 3.0L no start VIN: 5GZCZ63B22
Thanks for all the responses and sorry for the long delay to post fix. It was the BCM as suspected all along. I did not have the program to relash the BCM so I had to send it to the GM dealer. With them keeping it for a couple days telling me that it wasn't t...
2002 Saturn Vue 3.0L pc solenoid VIN: 5GZCZ63B02
Thanks to all who replied, especially Alex for the specs on the line pressure solenoid. The tranny shop that put the used unit in called the boneyard where they got the transmission and got the tcm for it out of the same car. Installed transmission control un...
2003 Saturn Vue 3.0L fuel gaud]ge VIN: 5GZCZ63B53
thanks for the replies. the common census and mine was the bcm. however the customer has not decided yo repair it . we have returned the vehicle and the customer is going to track her mileage for now. if she does decide to fix it i will let you know. thank...
2003 Saturn L300 3.0L No Start, MIL Lamp on, sercurity light on VIN: 1G8JW54R03
Thanks Everyone I knew I was missing something easy. I went through the key relearn a few times but I think I must have cranked it between those time. I ended up leaving the key on with battery charger for about 30 minutes, turned key off waited 30 seconds t... Trouble codes: B1811 (Max addapt long shift), B1000 (Ecu malfunction), U1096 (Lost com with ipc/dic or class 2 txd), B1260 (Security system data wrong but valid).
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