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Prev Professional Automotive Repair Technical Discussions for August 1, 2006
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue Ultra 3.8L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G4CU521XR
Vehicle came in with complaint of start/stall/cuts out on cruise speed and SES light on. Had EGR and Cam sensor codes, after testing found ECM at fault. Removed ECM and installed a reman. ECM. Started vehicle, idled poorly and stalled. Started vehicle again, r... Trouble codes: 101 (Mass Airflow Sensor Circuit)
2000 Buick Century Custom 3.1L Mechanical VIN: 2G4WY55J0X
This is more of an opinion or advise post. I have a long time good customer with a hard shifting trans with a code 1811. After reading the TSB and iatn post it seemed clear a PCS solenoid and valve body inspection / cleaning would resolve his problem. We refer...
1999 Cadillac Catera 3.0L Electronic VIN: W06VR52R4X
We got code p0703 Brake lamp switch.Trans. goes into limp mode when this happens. Tested switch-ok. Replaced switch. Cust. came back after three days and said it occured once. Problem is very intermittant. Only 1 archive, fix was ECM, but ignition switch was m...
1978 Chevrolet El Camino 3.8L steering VIN: 1W80A8Z480
This is for the frontenc shop that I use, All of the steering components have been tested and checked. The steering will not return to center from either direction, unless you turn the wheel back by hand. OK guys help me out and make me look good. Any ideas.
1995 Chevrolet C2500 Cheyenne 5.7L passing gear VIN: 1GCGC24KXS
shifts great except no passing gear
1995 Chevrolet S10 4.3L ABS and Brake Lamps VIN: 1GCCS14W7R
Vehicle came in for complaint of brake lamp coming on. On test drive I found that when you lift off gas after accelerating briskly the ABS lamp comes on and about 2 seconds later the brake lamp comes on, wait a couple of seconds and they go out in the same seq...
1997 Chevrolet Cavalier 2.4L ets VIN: 1G1F12TXV7
ets light comes on randomly. snap-on scanner shows wheel speed sensors all ok.
1997 Chevrolet Express 3500 5.7L Fuel Guage VIN: 1GCHG35R3V
Hello,maybe one of you techs has run into this before.I have a Fuel guage problem that vibrates,sort of like a hummingbirds wings,rapid pulsating,but,fairly stable.I can work the fuel guage with the scanner and the percentages match the guage movement.Everythi...
1998 Chevrolet Express 1500 4.3L Starting VIN: 1GCEG15W6W
This is a strange one - at least to me. Van was driving on highway and quit running. Towed in, I immediately found no fuel pump action, then realized fuel gauage reads past full with no movement, other gauges move. Started checking and found no power to pump o...
2000 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W6W
This truck drives fine but mill is on for low knock signal. knock showa 0.4 volts at Ildel. under acceleration it drops to 0.0. I have unpluges the sensor and had a reading of 4.98volts. I have replace the sensor to no avail. the cam retard always stays at 0.0...
2002 Chevrolet Silverado 3500 8.1L Hesitation VIN: 1GCJK33GX2
Hi again folks,two help requests in as many weeks.Really hope this one yields more info than the last one.This truck has a hesitation when cold.Only from a stop,only in the early stages of open loop operation,and only on normal accell.If you stuff it there is ...
2004 GMC Yukon SLE 5.3L No Start VIN: 1GKEC13Z74
Have a no spark condition. Have replaced the crank sensor & PCM. Have a signal coming from the crank to the Pcm. My Ignition Coils have power and ground. The PCM is not sending my IC Control signal for any coil. Need help. I found a TSB on a problem with the p...
1986 Oldsmobile Cutlass Ciera Brougham 2.8L MIL Lamp on VIN: 1G3AM19W6G
checked voltage on maf conector terminal "b" 4.8 volts. checked voltage between "a"&"c" 13.6 volts.scan tool shows about 6.0 grams per sec. all data agrees with these values.and also says maf sensor specs are based on rpm & tps values.after replacing 3 air flo... Trouble codes: 33 (maf sensor error), 34 (maf sensor low)
1993 Oldsmobile Bravada 4.3L Lubrication VIN: 1GHDT13W6P
This customer brought in his daughter's Bravada for cylinder heads and cfi replacement. He informed me that she had overheated it badly and he was certain one or both heads were cracked and was looking for the best deal to install them and a CFI unit he had bo...
1999 Oldsmobile Bravada 4.3L Hesitation VIN: 1GHDT13WXX
1999 Bravada with a very bad hesitation on accel. Pops back intake, then picks up and goes. add fuel on accel and it runs fine. I feel ive been thru all the basics,fuel pressure is 64psi koeo,55psi @ idle,pressure surges up to about 58psi while it is hesitatin...
1992 Pontiac Bonneville SE 3.8L Ignition key switch VIN: 1G2HZ52L0N
This is a vehicle that was donated to my school several years ago, so it does not have many miles on it, just a lot of student abuse. The original keys with the pass-key anti theft system were lost, a replacement aftermarket key switch was installed, but it wi...
1996 Pontiac Grand Am SE 2.4L Cuts out VIN: 1G2NE12T7T
Hello, I have a 1996 G Am with a 2.4 DOHC that cuts out at idle or low speeds below 25 mph. I did not have any codes until today when it did not want to start and stay running, so I checked the codes at that time and came up with a p1629, which is the PCM look... Trouble codes: P1629
2001 Pontiac Grand Am SE 3.4L Hesitation, Cuts out VIN: 1G2NF12E71
Have this Grand Am here. No codes. When you are sitting at idle and go to accel from a stop light or even back up slowly the car will hesitate or chug and die intermitantly. Even less often when your are driving it will act like you turned the key off for a sp...
2001 Pontiac Grand Prix SE 3.1L Cuts out, Stall, tach doesnt work VIN: 1G2WK52J01
when cruising down the road or sitting still acts like a engine misfire, but has no misfire on the scanner. Tach drops out when engine starts to miss.
1994 Saturn SL1 1.9L Hesitation, Stall VIN: 1G8ZH559XR
first time customer came in with a misfire and found two cyls missing. replaced plugs and wires and car drove fine after that. during qc drive car died and wouldnt start found a bad ignition module. replaced and again car was fine until qc drive. car now has n...
1999 Saturn SW2 1.9L Hesitation VIN: 1G8ZJ8275X
Howdy Saturn Guru's, This one's got us stumped, it has a flat spot just of idle only at operating temp. It will do it standing still while hooked up to the scope but worse while driving. It has new plugs and wires,on scanner everything looks good. Tested fuel ...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L Cuts out, Misfire VIN: 1G4HR5214R
Hey guys. I am 99% sure whats wrong with this one. What threw me off was the loss of power, and the FALSE 604 CODE supplied by the snap on scanner. The ECM must have a fuel cut when it sees a trans. problem to lessen dammage. I took Peter from Wisconson's advi... Trouble codes: 604 (quad driver failure).
1994 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HR5SL4R
This is one of those jobs we wish we could have seen coming and then ducked. We received a number of logical, well thought out responses including the possiblity that the crank sensor was the problem. We checked the magnet and clip, all intact and clean. We ev... Trouble codes: P0342.
2000 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y6Y
i was told by gm that those code are engineering codes, i tried two dealer ships to deal with this problem when they found out about those codes they dint want to work on the car, thanks to all how replied.
2002 Cadillac DeVille 4.6L Poor Idle Quality VIN: 1G6KD54Y92
well as per gary from ohio the iac was getting the wrong info from the computer so after replacing the computer the idle was perfect, thanks to those that replied
1984 Chevrolet Pickup C20 6.2L ignition linkage
Thanks to all replies. You were all right ,it's not easy to do on site but i did manage to get it done. Holding every thing in place while puting back together is tricky and 4 hands is needed. Thanks again team keep up the good work
1991 Chevrolet Camaro Z28 5.7L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G1FP2382M
Hi and thanks again for all the help, we pulled the distributor and found the reluctor wheel to be rusted, pretty bad, so we cleaned it up and the miss is gone. She runs smooth at all RPM''s . Thanks to all
1995 Chevrolet Cavalier 2.2L Ignition switch VIN: 1G1JC524XS
This is fixed. When I called GM dealer to get a switch they looked it up by the vin number and said that I had the second design switch which was 201.00 my cost. I took a chance and ordered one from carquest for the 1st design and it worked fine. made my day.
2000 Chevrolet Astro 4.3L Misfire VIN: 1GCDM19W8Y
Hi all. Thank you all for you help with this van. After i did the distributor trick, the van misfired far less then before, but still, 4 & 5 would, on a uphill grade at speed,(6%grade) misfire enough to set the flag. I had to replace the Cat converter, along... Trouble codes: P0300 (testing and results).
2000 Chevrolet Silverado 1500 4.8L Temp Door Motor VIN: 1GCEK14V0Y
Thanks for the information. It was suggested that if the door is on the same circuit as the blower motor a low voltage situation could occur if the blower is drawing too much current. I'm not sure in this case if the blower is on the same circuit or not. A new...
2000 Chevrolet Malibu 3.1L door ajar VIN: 1G1ND52J01
3 replies--First said to ohm ajar switch.Other 2 said the snap on scanner should read body codes.This was a 2000 year and my scanner only went to 1999.I removed drivers door and ohmed switch.Was bad,replaced switch and now ok.thanks to all
2001 Chevrolet Tahoe 5.3L a/c VIN: 1GNEK13T61
Well guys this one is finally out of my hair and I did get paid.. although he did not come back in person to pay me he sent his son in for some reason. Out of the 23 replies the majority of you said to check the low pressure switch on the reciever drier. I did...
2001 Chevrolet Silverado 2500 HD 8.1L No Start, Stall VIN: 1GCHK24G41
Thanks to all who replied to the problem ,I installed a new crank sensor and that has solved the problem,haven't heard anything back from the owners .plus I couldn't get it to mess up any more,so thanks again for the help Trouble codes: P0342 (cmp sensor signal low).
2003 Hummer H2 6.0L lack of power VIN: 5GRGN23U43
i double checked fuel press and volume, both were good. i replaced cats, it ran better but it still felt a little under powered. i let cust drive over weekend and they were very happy they said it has never ran better, so if they are happy i guess i am to.
1999 Pontiac Grand Am SE 3.4L Cooling Fans VIN: 1G2NE52E1X
First let me say thanks to all of you that responded to this odd ball of mine. Cooling fan problems shouldn't be that dificult! I am going to try and upload 5 screen grabs from my Modis and see what you think about them. I truley thought this fix wwould have b...
1999 Pontiac Sunfire SE 2.2L turn signal fuse VIN: 1G2JB124XY
i shifted the vehicle down to 1 and then it wouldnt blow the fuse anymore. couldnt find any broken wires. vehicle hasnt come back. thanks for any advice given.
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