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Prev Professional Automotive Repair Technical Discussions for December 8, 2004
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Open Help Requests for GM
Help Request Answers
1979 Cadillac Seville 5.7L No Start
hello all, I have a 79 Seville that is killing me. Put a reman engine in, ran fine, no start the following day. Have no info at all on this car. For some reason, it blew the inline fuse at the ecm, disabling the fuel pumps. Replace fuse and it does not blow, ...
1993 Cadillac DeVille 4.9L Poor Idle Quality, Surge VIN: 1G6CD53B1P
this vehicle will surge upon start up until it is put into reverse or drive, or turning the wheels against stop for about 5 sec- essentialy causing a slight load or dampening effect on engine. then it will idle down and continue to idle normally until you snap... Trouble codes: E30 (idle speed control circuit problem)
1973 Chevrolet Pickup 454CID valve train VIN: CCZ143J158
I returned the above vehicle to the customer, two days later the customer calls and says that it is still doing the ticking. At this point I'm at a lost. I am however thinking it could be the cam and lifter? Please let me know what you guys think, thank you in...
1988 Chevrolet K2500 Cheyenne 5.7L oil circuit VIN: 2GCFK24K8K
After much trial and tribulation , we finally received our rebuilt engine from our local machine shop . There were some problems about the time frame for delivery , make a long story short , we now have an LT1 5.7L V8 for our shop truck . I'm not real familiar...
1996 Chevrolet Blazer 4.3L Transfer Case VIN: 1GNDT13WXT
One of the guys in the shop recently purchased a 96 T Blazer. This vehicle has the electrically controlled 4wd with push buttons on the dash. With winter coming he decided to see if the four wheel drive works. He has noticed the lights in the switch will go ou...
1997 Chevrolet Lumina 3.1L abs lamp staying on VIN: 2G1WL52M8V
abs lamp comes on at 11mph and is setting right front wheel speed sensor code. wiring harness tests ok, jumper harness has been replaced, wheel speed sensor replaced, reluctant ring tests ok but never replaced and the hydraulic unit and electrical unit has bee...
1997 Chevrolet Cavalier 2.2L oil pressure
oil pressure is fine at 3000 rpm[65psi] but at idle it is only 12psi. Can't find any specs.on the low rpm. It turns the oil light on at stop signs.
1999 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDU06E1X
This one is for the GM guys. I have a Chevy Venture that after about 5 mile test drive the check engine light pops on with code P1404. Test drove with scanner attached and EGR position was reading fine and it still set this code.I know the EGR Valves are a pro... Trouble codes: P1404 (EGR Closed Position Performance)
2000 Chevrolet Astro 4.3L Fuel guage, Temp. Guage cluster lights VIN: 1GCDM19W9Y
Hey Techs, Got this Astro van and the fuel guage and temp guage inop. Fuel guage reading empty and temp gueage reading cold. Air bag light on, batt light on, low fuel light on, security light on, and brake light on. Tested fuel sending unit-Tested good, Temp ...
2001 Chevrolet Monte Carlo SS 3.8L Stall VIN: 2G1WX15K61
engine stalls in the bay @ idle, no codes. fuel pressure while running is 45 psi. engine can be started right back up. the following parts have been replaced, icm,crank sensor,ign.switch,pcm ( eeprom has latest and greatest update), mass air flow sensor,ign. r...
2004 Chevrolet Aveo 1.6L Misfire, MIL Lamp on VIN: KL1TD62624
Hi group, this Chevrolet Aveo have an intermittent misfire with the number 2 cylinder intermitently.The problem occur in the first kilometer, after the engine run great for the rest of the day and in some case run great for three days. The problem occurs somet... Trouble codes: P0300
1991 GMC K1500 Sierra SLE 5.7L lock up VIN: 1GTDK14KMM
hello, I'm at my wits end on this one. it feels like an ignition miss, it only occurs when the lock up comes on. we found leaking secondary, replaced it, tried again, still the same thing. trans fluid ok. i checked the fourth gear swich input and the t.c.c. o...
1994 GMC Safari 4.3L Excessive Emissions, Poor Idle Quality, Cuts out, MIL Lamp on VIN: 1GTDM19Z1R
Hello, techs. We have this Safari cargo van in here that belongs to a courier company. Driver wants to resurect this unit. It runs dual fuel with a propane conversion kit. The gas half of the unit has not worked for the last five years. Replaced all the fuel s... Trouble codes: 34 (MAP Sensor Ckt Low), 32 (EGR Error), 44 (Lean Exhaust), 43 (KS Problem)
1992 Oldsmobile Cutlass Supreme S 3.1L low coolant light VIN: 1G3WH14T2N
i have this 92 cutlass that belongs to a very loyal customer. the vehicle doesn't overheat and the heat inside is emmaculate. the only thing is the low coolant light blinks. i tried to bleed the sys. thru both vents (water pump and thermostat) and coolant only...
1994 Oldsmobile Cutlass Supreme 3.4L Poor Idle Quality, Poor Fuel Economy VIN: 1G3MR67XGR
This car is in pretty ggod shape but had problems. 1-4 coil and wires showed bad on scope pattern. Plugs had NO electrodes left. Also found a plastic vacuum line chafed on tranny dipstick tube. Fixed all of that. My concern is fuel pressure. I find spec of 41-...
1995 Oldsmobile Aurora 4.0L Oil Pressure VIN: 1G3GR62CXS
This vehicle came to us with a rebuilt engine a year ago. It had lost oil pressure while being driven and was towed to us in 2003 for no oil pressure. We removed the oil pump and replaced it. Everything worked fine till last week when the customer reported she...
1998 Oldsmobile Intrigue 3.8L noise VIN: 1G3WH52K5W
hello fellow techs; i have a hair puller here,car came in, no start,no crank, checked battery ok, found broken starter.i immediately thought of hydrolock condition,pulled plugs, sure enough hydrolock engine,pulled upper intake,hole at egr passage.installed new...
2001 Oldsmobile Aurora 3.5L Cuts out, Stall VIN: 1G3GR62H71
I have this vehicle and what is occurring is a very quick engine stumble a few minutes after a cold start. The tachometer will peg itself to the 8,000 mark and stay there until shut down or restart . None of the other guages are affected at this stumble. It fe...
1997 Pontiac Grand Prix GT 3.8L Poor Idle Quality, Surge, Stall, High cold idle VIN: 1G2WP52K6V
Hi all, we've been dealing with these symptoms on this car for a year and a half. I have only been able to witness it on a couple of occasions. I cleaned the IAC passage with good results for a while and then replaced the IAC which worked good again for a whil...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Century Custom 3.1L Fail emissions test VIN: 1G4AG55M3T
The first inspection receipt said there were 2 codes MAF and Bank 1 Sensor 1 Oxygen sensor. After repairing the check engine light I changed the MAF sensor and no more codes came back after clearing. I had thought you should go after the first codes first beca...
1990 Chevrolet Lumina 3.1L No Start, tries to start VIN: 2G1WN14T1L
I received 36 replies and have corresponded with several of the members who replied. This car remains 'unfixed' We have yet to find out why it won't run and it has been put on the back burner throughout the responses the same things were touched on over and ov...
1994 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Stall VIN: 1GNDT13WXR
Sorry for the long delay in posting. Just wanted to make sure this thing was fixed 100%. After checking everything 5 times, I realized that the distributor I installed(reman)had a bad module. Took the module out of the old distributor and she's running again. ...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GKCS13WXS
first most replies were fuel related and the fuel pressure is good with no drop off, no vacum leaks, and engine still hunting for idle and will not take gas exhaust is clear when it takes a notion it will idle and run great maybe 40 mins maybe 2 all ground sig...
1995 Chevrolet Camaro 3.4L No Start VIN: 2G1FP22S8S
Thanks again for all the help on this one. For all that mentioned the antitheft system, it was a good idea that I wasn't aware of. What seemed to have fix the vehicle was a ground imput to the pcm. I ran a separate ground to each of 4 ground imputs to pcm. On ...
1996 Chevrolet Astro 4.3L Excessive Emissions, Poor Idle Quality VIN: 1GBDM19WTB
engine has low compression and we are tearing down at this time.thanks for all your help and have a merry x-mas. Trouble codes: 172 (rich exhaust), 175 (rich exhaust).
1999 Chevrolet Venture 3.4L maxifuse 5 VIN: 1GNDX03E9X
First of all I want to thank Dennis and Roy for the ideas that they offered me on this problem. I finally decided I had to bite the bullet and remove the harness so I could inspect it further. I did find one burned through spot on the purple wire about three o...
1994 GMC Sonoma SL 4.3L Cuts out, Misfire VIN: 1GTCT14W0R
The harmonic balancer had slipped. causeing the timing problem. The lean missfire was the fault of the injector that had been installed in Oct. I had eleminated everthing else i could think of, called and got a replacement injector, truck runs fine now. Thanks...
1999 GMC Savana 2500 6.5L turbo VIN: 1GTGG29F4X
again thanks to all who replied. csutomer brang the vehicle back to us, we checked the waste gate operation that seemed normal, we also check for plugged exhaust but that was also fine, no air leaks found either, but when it would wisthle all i would have to d...
1988 Oldsmobile 98 Regency 3.8L Cuts out, Stall VIN: 1G3CX51CXJ
Thanks for all the support, I wiggled the crank sensor wiring and tapped on the sensor car never stalled or ran bad. Many of your responses said replace the crank sensor, alot of you said these can cause some weird problems. I replaced the sensor and have been...
1985 Pontiac Firebird 2.8L Stall, MIL Lamp on VIN: 1G2FS87S1F
finally customer decline anymore repairs mostly because we cannot find anythings after a couple of hours.i receved lots of replies about the maf, so i replaced it without any change at all,i wiggled a lot of wires,tap tested ecm,nada...we are going to wait if ... Trouble codes: 34 (maf), 42, EST.
1998 Pontiac Sunfire SE 2.2L engine VIN: 1G2JB1241W
Thanks to everyone that responed, Bruce [...] hit it right on the head, the oem thermostat has a much bigger & stronger spring, the aftermarket push open easily, while the oem barly moved. Replaced with oem stat & everything works properly. Unfortunatly I was...
2000 Pontiac Grand Am SE 3.4L 2-3 3-4 shifts VIN: 1G2NF12E3Y
The customer did not want any problems because they do alot of driving and did not want more diagnosing. So we installed a rebuilt trans and the problem is now gone.
1997 Saturn SL2 1.9L Dashboard VIN: 1G8ZK5277V
I received a number of replies from techs telling me to elevate the front of the vehicle to allow air trapped in the heater core to be bled out. I'd never heard of this on a Saturn, and Alldata did not specify this procedure either. A slight elevation wasn't e...
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