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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 13, 2006
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Open Help Requests for GM
Help Request Answers
1990 Buick Riviera Luxury 3.8L digital dash VIN: 1G4EZ13C7L
hello IATN members. This is actual my own car. I am on a road trip and all of my dash displays went out. This is a 1990 Buick Riviera with the digital dash. All I have been able to do is check fuses because I have no access right now to any information. The li...
1997 Buick Century Custom 3.1L Gauges VIN: 2G4WS52M0V
no crank, have no abs cel or security lights with key in run position. I have no power to BCM connector C 1 terminal C3. I can make the car crank by grounding the crank enable wire at ECM. I can communicate with the BCM but not the ECM. all fuses are good Code...
2002 Buick Regal LS 3.8L Hesitation, Surge, Stall, Misfire, MIL Lamp on, HARD START VIN: 2G4WB55K62
this regal runs like your pulling a truck behind you when going down the road, at idle it wont run unless you have your foot on the gas and it starts hard mean while the whole time its running its bucking and skipping.snap on scanner shows that every cylinder ... Trouble codes: P0131 (o2 signal low b1 s1), P0300 (random misfire), P0403 (egr solenoid signal out of range), P0404, P0405 (egr sensor a signal short/low)
1991 Chevrolet Lumina APV 3.1L starts & dies VIN: 1GNCU06D2M
Well guys, I have another winner of a problem. I have a '91 Lumina Van with a 3.1 liter engine. It will start and run, but after it warms up it will start and die twice and then won't start at all. It gives a shot of fuel the first two times, then nothing. I r...
1994 Chevrolet G20 Sportvan 5.7L lacks power VIN: 1GBEG25K0R
vehicle lacks power. timing on scan tool is always 20*. have tried advancing base timing 4*-6* with no change. have monitored knock sensor and even disconnected-no change. fuel pressure 14 psi all the time even driving down road so don't think fuel issue. back...
1996 Chevrolet Camaro Z28 5.7L No heat VIN: 2G1FP22P1T
Hello everyone. This vehicle come in for no heat, temprature seems to be running about 210-218 degrees. The car didn't have heat, but radiator was replaced because of a leak right under the radiator cap. We replaced the radiator not expecting to fix the heat i...
1996 Chevrolet Cavalier Z24 2.4L Misfire, MIL Lamp on VIN: 1G1JF12T5T
This vehicle is at another shop, the second shop to actually see this vehicle, and has a misfire on cylinders 1 and 3. It is a quad 4 engine. They tend to call us here for help in diagnosing some of thier troubles before eventually sending a vehicle to us. Sin... Trouble codes: P0300 (Random Misfire)
1996 Chevrolet C1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEC19M7T
vehicle sets mil every key cycle with code p1351 everytime. followed alldata flowchart to condemn i.c. module, replaced module and same code returns. checked a/c voltage while backprobing at module and at vcm, and is within specified range. scoped signal while... Trouble codes: P1351 (ic circuit high voltage)
1997 Chevrolet Monte Carlo LS 3.1L Cuts out VIN: 2G1WW12M2V
We have a 97 monte carlo with a 3100. when you accellerateit loses power. this is at 2500-3200 rpm.it feels like a flat spot. if you accelerate harder when it happens it comes out of it. It happens at any speed and in any gear.i am posting this for another sho...
1998 Chevrolet Venture 3.4L Power Steering VIN: 1GNDX06E3W
This van has a noise when turning to right louder the farther you go. Power steering pump and rack have both been replaced. Noise seams to be coming from power steering cooler. Thanks for any help
2002 Chevrolet Silverado 2500 HD 6.6L Transmission VIN: 1GCHK23142
Need help with Allison trans completely inoperitive. We have had in several times for same condition, 3 to 4 weeks between visits. When ever it rains trans will not move in any gear range. Have checked other help requests that suggested replacing trans range s...
2002 Chevrolet Silverado 1500 HD LS 6.0L abs VIN: 1GCGC13U62
Thank you for reading this long post. We have this truck that while stopping, the abs in momentarily activated. Using the Tech 2 we can see the wheel speeds all almost exactly the same. In play back, the rear iso valve command and rear iso valve feedback chang...
1990 GMC C1500 Sierra SLE 5.7L No Start VIN: 1GTDC14K2L
Thanks in advance for the help! I have a 1990 gmc 1500 pickup that has a no start. theres no fuel will start and run with alternative fuel source. at the relay i have the orange wire hot at all times, dk grn/wht wire hot for 2 seconds when key turned on, blk/w...
1993 GMC C1500 Sierra 4.3L Hesitation, Lack of power VIN: IGTDC14Z8P
Ok, gotta humbler here, many thanx for your time. Vehicle came in with driveability problem and needed basic tune-up (we thought). Started there...on road test afterwards, noticed bad sag at cruise; would occur (and stil is) at cruise, or in bay intermittently...
1987 Oldsmobile 98 Regency Brougham 3.8L No Start VIN: 1G3CW5136H
I may have jumped the gun on this one. This 3.8 was running poorly and then quit and would not start. The owner parked it and let it sit a few months. I put a battery in because the old one would not charge. Engine cranked ok. I grabbed a fuel pressure gauge a...
1990 Oldsmobile Toronado Trofeo 3.8L Radio / A/C VIN: 1G3EV13C7L
This model is called a Trofeo. There is a display screen in the middle of the dash that I believe is referred to as a CRT. We got the car with a dead battery and after we installed the battery, the screen displayed "theft alarm, enter unlock code" and had a ph...
2000 Oldsmobile Intrigue GL 3.5L Poor Idle Quality, hard starting VIN: 1G3WS52H1Y
original problem engine hard to start, no flare upon starting, also rough idle. changed plugs and fuel filter and iac, thought problems were gone. started and ran fine for about 1 day now intermittantly after sitting a couple of minutes hard to start. here's h...
1999 Pontiac Grand Am SE 2.4L Anti-Theft VIN: 1G2NE52T4X
I,ve went through all the flow chart for each code with no results of finding any loss of communications with any of the components in this system, just need some input. did i miss something? i don't think so but any help would be great. thanks
2000 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB1245Y
When we got the car, it still had a P0303 and missfired through rpm ranges. Tested systems, HC was found in cooling system. Cyl. head was warped. Head was machined and new gaskets installed. After that repair car missfires on #4 cyl. Comp. counts missfires onl... Trouble codes: P0300
1993 Saturn SL1 1.9L Poor Idle Quality, Stall VIN: 1G8ZG559XP
This car starts and dies several times before finally idling. It will restart right away but usually die over and over the first few times. Eventually it will start and continue to run but the idle will 'roll' between 500 and 1200 rpms and it will almost die u...
1993 Saturn SC2 1.9L Stall VIN: 1G8ZG1574P
Hi, We have a 1993 Saturn sc with a no idle issue. Customer bought car in because it would not idle. Immediate stall as soon as foot off gas. It was even hard to shift because idle dropped so quickly. We checked obvious basics and pulled codes. We had a code...
1994 Saturn SL1 1.9L power steering pump VIN: 1G82ZH559X
Hi everyone. I am looking for some advice. 94 Saturn Came in with a slight leak from front of power steering pump. I got a reman unit & installed. It was real noisey. Called & got another. Pump is nice & quiet but Very hard to steer. Ordered a pump from dealer...
2002 Saturn L200 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G8JU54F02
runs very rough at idle, with multiple codes as listed, excellent over the road. lt and st fuel trims are both negatives, engine load shows in the 40% at idle, map is 3.6+ volts at idle. found no vac leaks. car thinks it is under load? at idle. excellent compr... Trouble codes: P0300 (random misfire), P0108 (map high), P0107 (map low), P1599 (engine stall)

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Park Avenue 3.8L Interior lights VIN: 1G4CW53L6M
HI guys, Thanks for the replies everyone. I tried most of the suggestions you all offered to no avail. Customer stopped me and asked to just eliminate the battery drain for the time being. I removed both 15 amp fuses and the relay and the power drain went to z...
2002 Cadillac Escalade 6.0L Poor Idle Quality, Stall VIN: 1GYEK63N42
Thanks for everyones help.The problem was the fuel pump I noticed an unuasual humming noise from the tank the pitch of the humming would change whenever I would tap on tank so I hooked up my oscilloscope to the pump and the waveform was distorted so I replaced...
1989 Chevrolet Corvette 5.7L Excessive Emissions, Poor Idle Quality, Surge, Runs Rich VIN: 1G1YY3185K
Well Special Thanks to Robert [...]. It was a shorted injector. After reading all your replies I started testing this morning. First I ohmed all the injectors, 16.8 across the board. Then I scoped MAF as many of you suggested, no problem found. I decided to s...
1997 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire VIN: 1GNDT13W2V
thanks for all of the help that was great. i am not sorry for joining iatn. but i do feel stupid for missing one thing with this blazer. to go over what we did to this truck, customer came to shop with a miss & ses light on, scan found #4 miss fire,checked spa... Trouble codes: P0300.
1998 Chevrolet K1500 Cheyenne 5.7L Charging VIN: 2GTEK19R2W
thanks to all that responded to my request. special thanks to dan and keith from texas. although the fuel pressure was normal and when i tried the batt charger it made no difference in the noise alt plugged in or not. but the alt ripple sent me in the directio...
1999 Chevrolet Blazer 4.3L transfer case VIN: 1GNDTI3W3X
Hi, all. Customer is not bothering to repair because she can still use auto 4WD. Thanks to all. Good to know more about the internal workings of these units. Based on what I now know, this is probably a shift fork problem inside the case.
1999 Chevrolet Camaro 3.8L Poor Idle Quality, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G1FP22K3X
Not able to fix the problem for while attempting to finish solving it and after it was running for awhile with no noises I shut it off to repair a vacumm leak and attempting to start it it stopped turning. Thinking the starting jammed I removed it and tryed tu... Trouble codes: P0300 (3 misfire), P0303 (random misfire-intermitten).
2002 Chevrolet Express 2500 5.0L Mechanical VIN: 1GCFG25M22
Thanks for all the replies. I pulled the valve cover and found a broken rocker on cyl 5. Runs great now and no noise.
2002 Chevrolet Impala 3.8L MIL Lamp on
Thanks for the replies, apparently the new calibration I flashed to the PCM took care of the problem. Trouble codes: P0410 (Secondary AIR Injection Malfunction).
2003 Chevrolet Tahoe LT 5.3L rear heater VIN: 1GNEK13Z43
Sorry but we tried everything and nothing worked. We sent the customer to the dealer and ask him to report back to us if they were able to repair the problem. He has not called so I assume that he decided not to repair.
1995 Oldsmobile Aurora 4.0L Engine VIN: 1G3GR62C05
Apon disassembly of the motor, found cylinder #5 piston sleeve to be cracked. At 129K , it was not worth fixing on this car, nor was it worth a motor swap. Judging by the labor involved in disassembling this motor, may have been borderline worth a headgasket r...
1995 Pontiac Grand Am SE 3.1L Cooling Systems VIN: 1G2NW55MIS
sorry about the delay,customer took the car to another shop for a second opinion,he has adviced me of concern for my ability to fix it,claims someone else can find out what happened,i only hope if there is something that i overlooked i can be taught the new pr...
2002 Pontiac Bonneville SE 3.8L Intake Manufold VIN: 1G2HX54K12
After reviewing all the alternative fixes, I decided that since this vehicle was a 2002 and problems with EGR burn-thru seemed to have been cured by 2000, I would go with an updated GM upper gasket for the intake manifold. Upon disassembly and examination, I f...
2004 Pontiac Grand Am SE1 3.4L brake light VIN: 1G2NF52E14
THANKs to all who replied customer opted to return the car to the dealer. I feel that u guys are right about reflashing the bcm but i just have sit and wait to see what happens now thanks!!!
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