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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 17, 2007
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Limited 3.8L Surge, Cuts out, Stall VIN: 1G4HR52L8R
hello, i have this car that has came back to me a couple of times now. the problem is that this car started shutting off while the customer was driving it on the freeway. first thing i checked was the fuel pump it was fine so i tought it was the fuel filter. i... Trouble codes: 321 (no 18x ignition pulses), 361 (est line not toggling ic wire)
1995 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52L2S
I just need one thing confirmed...At the red connector at the computer, the black feed from the cam sensor...should switch from about 5 volts to 0 volts, correct? I think I have a bad cam sensor, cause with a dig. volt meter, it switchs from 4.86 as a high and... Trouble codes: P0341
2004 Buick Rendezvous CX 3.4L rear diff. pump ck. valve VIN: 3G5DB03E34
Hello everyone. I have this rendevous that has no codes in any module but the DIC display reads AWD DISABLE. I can get into ABS, powertrain and ATC and the only hint I get is "AWD fluid temp diable-yes", on one of my data readings. I read up on info and it sou...
1987 Chevrolet Caprice 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G1BL51Z7H
this car came to me with a severe hard start cold it would start and die untill it was warm enough then it had a very bad hesitation. i ck'ed the egr valve it is working i ck'ed for internal and external vac leaks none found. timing is ok @ 0 deg with the wire...
1987 Chevrolet S10 2.5L No Start VIN: 1GCBS14EOG
Vehicle came in crank no start, backfire. Ck fuel ok injector pulse ok distributor cap and rotor.has good spark on all cylinders. ck compression 160 all r&r valve cover inspect rockers. cam movement all ok removed timing cover inspect gears all lined up no key...
1990 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1GCDK14K4L
Hello everybody. 1990 Chevy K1500, 4X4, 350 TBI. It's been here a while, really needs to go. Current problem is a severly surging idle, and no power under load. Intake and EGR were both leaking, have both been resealed. Exhaust numbers and Lambda test indicate... Trouble codes: 44 (lean exhaust)
1994 Chevrolet K2500 5.7L No Power VIN: 1GCFK24H9R
Hello Group my name is Todd, I have this 94 chevy K2500 PU that is here from another shop who wanted more power so they installed a rebuilt 5.7L Longblock in this truck that originally came with a 5.0L, well the reason why it is here is because it has no power...
1995 Chevrolet K1500 Cheyenne 5.7L Hesitation VIN: 1GCEK14K7S
this truck opens the egr valve 100% just off idle. The cust. had the tps, solenoid and egr valve replaced before he got here. You can see it on the scan tool go to 100% at about .86 volt. So I put the PCM in and it made no change. Any body see this before and ...
1995 Chevrolet Caprice Classic 4.3L coast VIN: 1G1BL52W75
This car does not want to slow down. During decell it will coast during speeds above 25mph for extended peroids. The car will maintain what ever speed you are at. When coasting the transmission stays in third gear until brake or throttle input. Is this transmi...
1999 Chevrolet K2500 7.4L poor acceleration VIN: 1GCGK23J0X
customer asked for tuneup, suggesting cap, rotor, wires, plugs. said engine didnt have the power it should, esp for 454. i felt a missfire when i test drove it and agreed a good tuneup as a good place to start. i replaced cap, rotor, plugs and wires. i no long...
2000 Chevrolet K2500 7.4L Poor Fuel Economy, MIL Lamp on VIN: 1GCGK23JOY
This truck is owned by one of the other techs,its low on power,gets poor milage(3-5MPG),and sets a P0175 rich on #2. He has replaced both O2's with delco ones,installed new regulator,cleaned MAF. Also it has had a full tune up with cap and rotor. At an Idle... Trouble codes: P0175 (engine rich bank 2)
2000 Chevrolet Astro 4.3L abs VIN: 1GNEL19W7Y
Thanks for you help, The abs system kicks in at low speeds under 5 mph. It has new front wheel sensors and rotors. The van also has a newer set of matching tires.The front wheel bearings are tight, there are no codes current and one code in history for a brake...
2000 Chevrolet Silverado 1500 5.3L compressor VIN: 2GCEC19TOY
head scratcher... both low and high sides pressure seems to be well within limits.low side 40 .and high side 225. have good cold air setting still at idle.compresor runs great.start to drive,get about 6 to 8 miles.start getting warm air compresor cuts off. pul...
2000 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality VIN: 3GNEC16T1Y
it idles ok, about 600 rpm in gear at idle but randomly drops to about 380 rpm then picks up again. i checked the throttle motor assy wiyh vantage seems ok. no codes are stored. found tsb but its not for this truck.data appears normal but i'm not to famliar wi...
2002 GMC W3500 Forward W3S042 5.7L power steering VIN: 4KDB4B1R52
Hello boys!!! I replaced the power steering pump and high pressure hose that was leaking. Vehicle had no power steering when arrived in shop. After pump replacement, the steering is inermittently good, except when trying to turn right especially, it reacts as ...
2003 GMC Sonoma SL 4.3L drive shaft VIN: 1GTCS19X63
has anyone seen or heard of this problem vehicle has severe vibration at lower speeds & comes back at higher speeds. we had the driveshaft rebuilt & balanced by a reputable drive line repair shop. he claims its a condition that requires the differencial to be ...
2003 GMC Envoy SLT 4.2L electo viscous fan clutch VIN: 1GKDS13SX3
helo hope some one can help me i have not had to deal with one of these elctro viscus fan clutches before but for the limited info i have everything is working as it should. the customer says he has never heard the fan on the car but now he can what is happeni...
1999 Oldsmobile Intrigue GLS 3.5L MIL Lamp on VIN: 1G3WX52H3X
This car is from a dealer so I dont know much.. I have used [...] brand scanners. I have a check engine lite all the time and there are no codes in the engine or transmission computer. live data shows the computer recognises the lite as on but no codes an...
2001 Pontiac Aztek 3.4L windshield wipers VIN: 3G7DA03E61
When the wipers are turned on the linkage moves 1/4 inch and that's it. Obviously, the fuse is good, but I learned the wiper module contains an internal circuit breaker which I believe is the culprit. I have power and a ground to the motor, but without a wirin...
2003 Pontiac Montana 3.4L 1 st gear VIN: 1GMDX03E03
the problem with this transmission now is that in the am after sitting overnight , when you shift from reverse to drive the transmission will flare and then engage. we dissasembled and resealed the unit but still doing this . after 4 or 5 shifts it will stop d...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Century Custom 3.3L Cuts out, Stall VIN: IEKM38J49J
replaced pcm it ran better but stall is still there i went thru each reply and did what everyone said just to make sure i was missinhg nothing but still stalled i raised the base idle to try and eleavate customers concern and of course they don't want to spe...
2003 Cadillac Escalade 6.0L Traction control VIN: 1GYEK63N23
Thanks Charles and Thomas. Rust build up under sensor mounting was culprit. Guess we got lazy, and trusted scan tool data, instead of manually checking voltages and waveforms. Looks like cadillac "desensitized" abs preactivation problem enough to finally repai...
1987 Chevrolet Camaro Z28 Iroc-Z 5.7L rear hatch latch VIN: 1G1FP87FXG
thanks to all that replied.after the vehicle sat for several hours,I was surprised to see that the rear hatch had closed on it's own. This time I had an assistant use the switch in the car and I held the weight of the hatch off the latch as it opened, It works...
1989 Chevrolet Camaro Iroc-Z 5.7L No Start VIN: 1G1FP2187K
1997 Chevrolet Lumina 3.1L no start VIN: 2G1WL52MOV
good morning everyone thanks for all the help . i did a ohms test on the two wires go to the switch and it show broken wire going to the key switch. thanks for all the responded
1997 Chevrolet Blazer 4.3L Hesitation, Misfire VIN: 1GNDT13W6V
Thank you to all for your help. In turns out that while fuel pressure was good, fuel volume was not. Replaced fuel pump and strainer, and the truck runs great! My sincere thanks to all of you that responded. Jeff
2000 Chevrolet Impala 3.4L havc VIN: 2G1WF55E9Y
thank`s for help. replace control head. customer has not returned.
2002 Chevrolet Silverado 2500 HD 6.6L Misfire, VIN: 1GCHK23162
thanks to all 6 replies. found the special policy on fuel injectors 7 years or 200k. advise customer. went to gm dealer. iatn is one of the useful tools to have. thanks again. robert.
1986 Oldsmobile 98 Regency 3.8L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1G3CW69BOG
Sorry for the long delay in closing. I had to make some money before losing more on this Oldsmo-Buick. I got several replies for low fuel pressure, that was ok, until running it dry once. Checked the signals to the computer from the Ignition module, all looked... Trouble codes: 44 (lean exhaust), 42 (est or bypass error).
2000 Pontiac Grand Am GT 3.4L Poor Idle Quality VIN: 1G2NV52ESY
After finally getting ahold of a scanner, monitored while driving and found the TPS was working perfectly. Check the Idle control valve and found it was sticking. Replaced Idle control valve and did a relearn and is running great now. And it did set a code for...
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