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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 27, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick Park Avenue Ultra 3.8L Poor Idle Quality, Hesitation, Stall VIN: 1G4CU5318P
Greetings to all,thanks in advance for your time.I;ve got this supercharged Buick,high miles,well maintained that is running super lean.Dies 4 ior 5 times cold,hesitates warm,runs poor overall.Oxygen sensor spewnds a lot of time at .010 volts or less,but will ...
1990 Cadillac Seville 4.5L Blower motor VIN: 1G6K5537LU
First let me say this I do not work on Cadillac's that much other than maintance. This on has to problems that might be related to each other. One is the blower motor will no shut off when the car is turned off. The other is a high idle around 15 to 1600. I ha...
1991 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G6CD53B3M
This Cadillac 4.9 has 166,000 miles, Intermittently the engine will(hot/cold)stumble/hesitate, exhaust is black, Checking with the TECH I when this happens the readings are as follows; Coolant Temp shows -38F, MAT Sensor shows -38F, MAP shows 103, Throttle Ang...
1988 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 2GCHC39N5J
I know this should be easy but it is puzzling me. This truck has a code 45, o2 sensor pegs at 800mv, if reved to about 2,000rpm 02 sensor will come down a little and occasionally even start reacting normally except is sluggish. All o2 sensor testing looks OK. ... Trouble codes: 45 (rich exhaust)
1993 Chevrolet C1500 Cheyenne 5.7L reverse binds VIN: 1GCDC14K0P
Hello everyone and thanks for the help on this one. I rebuilt this tranny on my own truck because 3rd and 4th went out. I installed a master kit, trans go shift correction kit, new spacer plate. The transmission worked perfect for 2 days and then i was pullin...
1994 Chevrolet Camaro Z28 5.7L MIL Lamp on VIN: 2G1FP22P7R
Hello techs, We got this camaro in on the hook. It wasn't drivable because the head gaskets blew and we had coolant where coolant shouldn't be. Had the engine rebuilt by a very capable machine shop, and the engine sounds great. I thought I was basically done w... Trouble codes: 36 (Loss of high resolution distributor/crank signal), 41 (voltag high on the ignition module circuit 423), 46 (VAT Code), 51 (PCM Program Fault)
1995 Chevrolet Lumina 3.1L Hesitation, Surge, Misfire, Poor Fuel Economy VIN: 2G1WL52MOS
hello guys this car came in to me with no repair history runs rough ,I pulled codes has 77& 76 egr solenoids 2&3 . I went ahead and did function test found no flow,raise hood has a brand new egr valve on it,egr port needs to be cleaned .now on to next problems... Trouble codes: 77 (egr 3), 76 (egr 2)
1996 Chevrolet C60 Kodiak C6H042 6.6L starts and dies VIN: 1GBG6H1J1T
Hope there's a few medium/heavy truck guys out there.Customer says he's been able to get truck running with ether and it would run ok all day.[this can't have been going on very long]Found hole rubbed in fuel hose from primary filter to engine.Repaired and ble...
1998 Chevrolet Lumina 3.1L ABS module
I need help with a abs light that is on. I've been working on this car for some time and can not get the abs code P1244 out of the system. This is what we have done. Replaced the motor pack, replaced the ebcm, checked the wires from the ebcm to the motor pack ...
1999 Chevrolet Silverado 1500 5.3L steering box or intermiant shaft VIN: 1GCEK14T1X
This vehicle has no record of being in an accident. The problem started very interminant, but has become more common in recent weeks. The problem is that when the steering wheel is turned to the left, there is a growning noise heard. The noise is heard only wh...
2000 Chevrolet Impala LS 3.8L Low Tire Pressure System VIN: 2G1WH55K3Y
I have the low tire pressure light coming on. The code was cleared but came back on after a short drive. The tire pressures are good. Checking the computer under the ABS system I found a code [C1245 RF ABS CHAN/LO PRSS/MSTR SNSR], but could not find any inform...
2000 Chevrolet Malibu 3.1L cruise control VIN: 1G1ND52J6Y
Hey everybody. this car intermittantly loses cruise control. you can always hit resume and it will work again for a second and cut back out again. this will hapen four or five times in a row and then it will work correctly for a long time. there are no codes s...
2000 Chevrolet Malibu LS 3.1L 2nd gear accelration at 40-50% load from 15-25 mph VIN: 1G1NE52J5Y
original complaint was for surging on highway between 55 and 70 mph on light accel. This surging was originally very duplicateable on the highway before the trans replacement and also trans was slipping and chattering on takeoff. Now trans has been replaced bu...
2000 Chevrolet Malibu LS 3.1L Surge VIN: 1G1NE52J0Y
This vehicle has an intermittant problem that the customer is complaining about and I have not been able to duplicate. the engine RPM at cruise will jump 100 rpm and it will do this for 100 K. up and down without setting any codes then it will stop and run nor...
2001 Chevrolet Monte Carlo LS 3.4L Battery, radio, IPC VIN: 2G1WW12E11
Hello, Thanks for any help. Like I said the BCM fuse and the RADIO fuse together got rid of the draw. I then tried unplugging components. Found that if you unplug the radio and the IPC then the draw went away. I am not ready to say that both the IPC and the ra...
1985 GMC G3500 Vandura 5.7L drivetrain VIN: 2GTGG35M9F
About a year ago the customer decided to put this van into reverse at 75 mph, when this happened it snapped the crankshaft, and blew the trans apart. He had a new engine and trans (th400) rebuilt for the van, and also had the drive shaft rebuilt, (midshaft bea...
1992 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Hesitation, Poor Fuel Economy VIN: 1G2NE1438N
Hello fellow tech, this one has us stumped. The car was running great 1 week prier for inspection. Customer bought it and drove for one day. Called complaining about running to rich. Upon inspection found no codes, but data showed o2 not switching rich, and in...
1998 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WP5218W
I would just like to say thankyou in advance. I need some help before I get involved in this car. The car belongs to my week old wifes sister. Code P1629 is not one that I am to familar with; I think that it has something to do with the ingition switch. Code P... Trouble codes: P0300 (random misfire), P1629 (theft fuel enable-incorrect/no sig), P1646 (boost sol/5v ref c/evap vent ckt)
1997 Saturn SC2 1.9L Misfire VIN: 1G8ZG1277V
this car shows missfires on cylinders 1&4 engine runs great though, you see them at cruise somtimes but they really show up on decell , crank is in sync, car also has new wires & plugs , coil packs check out & switched them with 2&3 with same results, also mis... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Regal 3.8L master cyl VIN: 2G4WB11L2N
Thanks to everyone who took the time to respond to my request. It seems there are aftermarket units available in the states at pep boys. It turns out my customer has relatives living in the U.S. and is going to have them purchase an aftermarket unit in the U.S...
1992 Buick Skylark Custom 3.3L No Start, no check engine lite VIN: 1G4NJ54N8N
hello fellow members, vehicle is fix thank to you, some where right, some?..., well anyway ecm was bad. my partner didn't have much patient, so i had to take time to swing by too his shop & help him out, order a ecm, plug it in & their was a 'check engine li...
1998 Cadillac DeVille 4.6L Rear Knuckle Bushings VIN: 1G6KD54Y2W
Sorry to report this vehicle is not fixed, and probably won't be by me. My local Cad. dealer had the knuckles on backorder for a while. Now he offered the customer a better price on the part if he does the job in his shop. Of course his labor is much higher. B...
1965 Chevrolet C10 350CID alignment specs VIN: 4C154A1194
First I would like to thank everyone that took the time to help. There was quite a wide variety of specs posted, but the one listed below is what we will use tomorrow when we attempt to make the rod go straight again. This would be a good number to put in our ...
1991 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCDC14K9M
First of all, I would like to thank everyone for their input. The consensus of most all was the EGR valve and you were correct. Thanks again. Trouble codes: 43 (esc).
1992 Chevrolet Cavalier Z24 3.1L Cuts out VIN: 1G1JF34T3N
thanks to all who offered advice on this problem.unfortunatly we could not find the problem with the vehicle and rather than sink anymore money into the junky car the customer will just live with the problem or junk it.thanks to all
1995 Chevrolet Cavalier 2.3L Misfire, MIL Lamp on
Sorry fellow TECHS I didn't get back to you sooner on this vehicle but the owner needed it for work and was driving it till I could figure out what to do with it. I appreciate all your help I received on this problem. Some of you suggested to use Generic OBDII...
1999 Chevrolet Corvette 5.7L abs system VIN: 1G1YY22G4X
thanks for all your suggestions.This was a very intermittent problem that i could never duplicate with equipment hooked to the vehicle,but with what I have already done and the information i recieved I'm replacing the abs module and hoping for the best.
2000 Chevrolet Malibu 3.1L Electronic VIN: 1G1ND52J6Y
The condition on this car is normal. it is a software glitch giving me the incorrect readings. the car has not had a problem since i replaced the selector switch. thank you all for your replies.
2002 Chevrolet Express 3500 LS 5.7L Poor Idle Quality, Stall VIN: 1GAHG39R12
this vehicle is gone but may come back for future service.my request was fuel pressure specs which 1 reply sent me.3 replys stated throttle body cleaning-1 for egr carboned up and 1 for intake gasket leaking.i will clean throttle body and motorvac which should...
1996 GMC C1500 Sierra SL 5.0L All Shift VIN: 1GCGC24M3T
Once again iATN provides an incredible response and provides the FIX. The vast majority of replies were that the power to the trans fuse was intermittent because of worn out contacts in the ignition switch. I ran a jumper to the trans fuse from the B+ and all ...
1996 GMC K1500 Suburban 5.7L 2-3 shift VIN: 1GKFK167R6
Received some good replies regarding shift solenoid. Since this is my own vehicle, I have not had the time to check it out. Will post fix at a later date.
2001 GMC Cab & Chassis Sierra 3500 8.1L tcm/pcm VIN: 1GDJC34G51
Sorry it took so long to get back...I double checked for codes in the tcm and no codes were found...however light is still on..customer took vehicle back as it is running and shifting properly and he does not care that the light is on at this time. Thank you t...
2000 Hummer H1 6.5L Excessive Emissions VIN: 137ZA8434Y
Hello group, This truck turned out to be quite an ordeal. Here is what we found. We were able to retrieve codes P0236 & P0238 which surround the operation of the turbo & wastegate. Upon checking these items no trouble was found. It is important to note that ...
1999 Oldsmobile Intrigue GL 3.8L theft loc radio VIN: 1G3WS52K2X
Thanks to all that sent me the code. Entered the code which unlocked the radio.
2003 Pontiac Grand Am SE 3.4L Excessive Emissions, No Start, Poor Idle Quality, Misfire VIN: 1G2NF52E63
Thanks guys. Did a leak down test, in specs. Upon further testing & review, we found that vehicle had prior electrical/coil pack work. Coil packs switched around upon reinstall. Yep, we moved wires around, fired rt up. Something simple. Thanks for the help.
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