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Prev Professional Automotive Repair Technical Discussions for April 7, 2006
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Open Help Requests for GM
Help Request Answers
1998 Buick Regal LS 3.8L tcs master iso va.lve VIN: 2G4WB52K3W
gm techs .. i do not have alot of info on this abs fault. codes c1255 and c1273 are stored. customer states abs and traction lights came on then went off. cleared codes and now c1273 comes back immediately tcs master iso valve fault. im really looking for a di...
2000 Cadillac Catera 3.0L Misfire VIN: W06VR53RSY
Hi everybody : This vehicle is from auction,the service engine soon light is on and it got two codes : mass airflow sensor circuit problem,and random misfire. Look at the mass airflow sensor and found the sensor is unplug,plug it back in and the engine runs v...
2000 Cadillac Catera 3.0L Hesitation, Cuts out, Stall, Misfire VIN: W06VR54R8Y
thanks for checking this one out! car came in with a complaint of a noise under (near area) of right bank valve cover. our customer decided to have us change oil and put an additive in rather than tear down. it returned the next day with multiple cylinder misf...
1985 Chevrolet Corvette 5.7L No Start VIN: 1G1770789F
vehicle towed back in.still has good fuel pressure.good spark.injector signal will barely light noid light.with injector disconnected.test power and ground.found both wires having power.disconnect ecm and both wires still have battery voltage.tested on more th...
1994 Chevrolet C2500 Suburban 5.7L Poor Idle Quality, Misfire VIN: 1GNGC26K5R
This truck came in for running rough at idle and still has the same symptoms. Serious Engine misfire which can be felt through the whole truck and gets worse as engine temp increases butis still noticable when cold but very minor. Distributor was replaced due ...
1995 Chevrolet Lumina APV 3.8L Misfire VIN: 1GNDU06L9S
this vehicle idles perfectly,it also accelerates perfectly until under a load.the miss is regular not random. i felt it was ignition related until i performed a major tune up including ignition module. i have also replaced cam & crank sensors along with loaner...
1995 Chevrolet Astro 4.3L Misfire VIN: 1GDDM19W5S
Hi everybody there,i have this van driving me crazy,van runs good in open loop,when goes to close loop oxygen sensor stays down to 220 mv.Purge control solenoid duty cycle is 99% at idle(not sure normal or not).The mechanic checked the distributor shaft for cr... Trouble codes: 66 (3-2 solenoid), 67 (torque coverter clutch solenois), 83 (torque converter quad drive)
1998 Chevrolet Corvette 5.7L tire preassure sensor VIN: WISED65925
Car came in after having he front preassure sensors replace at the local dealer problem was not fix, customer's complaintis the information center on the cluster indicates SERVICE VEHICLE SOON & SERVICE TIRE MONITOR SYSTEM what i notice is that when you try to...
1999 Chevrolet Monte Carlo LS 3.1L surge VIN: 2G1WW12M6X
please help, i found many post on this very same problem but many different complaints. i have the surge between 55 and 70 cruising on the highway light acceleration especially going up small hills. i believe it's lean. pings. here's what we have done. 2 motor...
2002 Chevrolet Cavalier LS Sport 2.2L timing chain VIN: 1G1JH52F92
DOHC engine. Original timing chain guide and tensioner blew up. GM replacement package installed. Chain tightener racheted tight ok. Before installing front cover we turned the engine over at crankshaft pully with wrench and chain will jump a tooth. The car ca...
1996 GMC Foreward 5.7L No Start VIN: 4KDB4B1R8T
I have here a 1996 GMC/ISUZU W4 Gas Foreward truck. It is using the Chevy 5.7 Engine and auto trans. What I need is a wiring diagram. I have no power to the Ignition fuse and the VCM fuse. I have no diagram for this vehicle and need to know where these fuses ...
1999 GMC Yukon Denali SLE 5.7L Unknown VIN: 1GKEK13R7X
have a yukon with what sounds like the start of a bad wheel bearing.noise is from left front corner and not able to change swerving left or right.can even feel slight vibration in floor with your left foot.customer states it has been making this noise for quit...
2000 GMC Yukon Denali 5.7L mastercylinder VIN: 1GKEK13ROY
sometime the brake pedal goes to the floor.Chevrolet dealer said it a bad brake booster.625.57. i thought when brake booster goes bad,u get a hard brake pedal
2001 Oldsmobile Aurora 3.5L Stall VIN: 1G3GR64H61
Customer complaint of intermittant stall at start up and at stops. Worse at startup when cold. When it stalls at a warm stop, on restart it may hesitate on initial acceleration. We have only had it stall a couple of times on start. Thanks in advance, Nick
1996 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE52TXT
the car was purchesed at the acution it had a vacuum line undone and the BELOW parts were replaced do to fouling cracks and so on when it left it would only have a slight miss in the morning but go away after a while but now it is back missing all the time on ... Trouble codes: P0300 (testing and results)
1999 Pontiac Montana 3.4L No Start VIN: 1GMDU06E4X
Van came in on hook no start,we went out and tried it,started.Changed fuel filter it did not start.Has no spark I have a rpm signal,otc scanner says yes to cam signal.I have a 24x signal .It does not have theft system.I notice it had a remote starter that was ...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet K2500 Cheyenne 5.7L speedo and tach VIN: 2GCFK29K1N
we tested all and ended up replaceing the dash with a new oem dash problem appears to be fixed at this time thanks to all who helped out
1992 Chevrolet Cavalier RS 2.2L No Start, Cuts out VIN: 1G1JC5448N
To start I would like to thank all who responded. The concern turned out to be a loss of current on the ECM power feed that comes through fusible link 'D' located at the battery. The red wire coming from fusible link 'D' had been chewed on by a mouse some ti...
1993 Chevrolet S10 4.3L Cuts out, BACKFIRES VIN: 1GCCT14ZXP
thanks for all the replies. this is another case of me assuming. custumer said he had done recent tune up and the other work i stated above, so never looked back. it was the advance auto wires breaking down causing the miss. all's well now. the other work was ...
1995 Chevrolet K2500 Cheyenne 6.5L Surge, Misfire VIN: 1GCFK29SW7
I haven't got this truck back into the shop yet. From the responses I got, I suspect we have an injection pump problem. A couple of other suggestions mentioned problems with the wastegate solenoid, or with the plastic vacuum line to the wastegate getting holes...
1997 Chevrolet K1500 5.7L convertor VIN: 2GCEKI9M4V
well guys i installed the transgo kit and it worked. did have some metal in the pan but im gonna drive it until it quits. thanks
1998 Chevrolet K3500 Cheyenne 6.5L Front end VIN: 1GCHK39F0W
Thanks everyone for all your help. They cause of this wobble was rather quite simple; We measured run-out on the front rotors at 0.002', that was on the outer face of the rotor thinking it would be the same on the inner - NOT! The inner face was actually 0.005...
1998 Chevrolet Cavalier 2.2L instrument cluster VIN: 1G1JC5247W
the majority of responses were aimed at the ignition switch. so i pulled the switch and the plastic cover on the switch and found burned contacts inside. replaced with new switch problem is gone thanks for all the help other replies were possible ground at tra...
1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Surge, hunts for idle VIN: 1GCHG35RXX
Thanks for all the replies. I got alot of good suggestions. The problem was the powertrain control module. It split & had water in it. I had no fault codes to lead me to the problem. A friend had suggested taking a look at the pcm after I said the long fuel tr...
2004 Chevrolet Aveo 1.6L Engine VIN: KL1TJ52024
First of all, thank you to all who responded to my request. Most of the advice I received was about the anti-theft system but this was not the case for this vehicle. Everything was still testing as it should after the replacement of the ECM. I began to test fo...
1991 Geo Metro 1.0L No Start VIN: 2C1MR2469M
Some good replys but the car just started to run right and has been going sence...Thanks
2002 GMC Envoy SLE 4.2L gear shifter VIN: 1GKDT13SX2
well the boss insisted on replacing the brake light switch first since it was inexpensive and easier to get at. that did not fix it. we removed the center console and found that the ground wire going into the connector was broken. repaired wire and drove vehic...
2001 Oldsmobile Alero GLS 3.4L Cuts out VIN: 1G3NF52E41
After testing PCM power and grounds, fuel press. and flow, exhaust backpressure, and watching the scan tool I determined it was either a crank sensor or a PCM. It was the 7X crankshaft position sensor. Thanks for all the input. Tim
1992 Pontiac Grand Prix SE 3.1L No Start, Stall VIN: IG2WH54T8N
All advice from you fellow Techs was tried before I submitted my help request. Thanks anyway everyone. I was able to return the computer to the parts dealer. Customer has given said vehicle away instead of investing more money into it. Trouble codes: 22 (TPS Voltage low).
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