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Prev Professional Automotive Repair Technical Discussions for February 6, 2007
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Open Help Requests for GM
Help Request Answers
1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5338L
This Cadillac seems to start and run good in the morning no matter how cold it is. It sometimes be hard starting after it was shut off for a couple hours. Changed the coolant temp sensor and that seemed to fix that problem. Now after that repair a couple days ...
1997 Cadillac Eldorado 4.6L Poor Idle Quality, Misfire VIN: 1G6EL12Y8V
Looking for some direction please 1997 4.6 Cadilac Eldorado. Poor idle quality. Gently hunting for an idle and seems to have a random lean missfire. Obviously running lean. Fuel pressure is 53 PSI out of 48 - 55 spec. with good volume. By the scan data Bank 1 ...
1989 Chevrolet Corvette 5.7L cylinder head VIN: 1G1YY2181K
I attempted to get original dimensions of this cylinder head from edelbrock but not available or so tech said ,so that I could check if either the manifold and/or the cylinder head(s) have been machined too far causing some kind of mismatch??? I did an intake ...
1989 Chevrolet Pickup C3500 7.4L intake manfold
chevy guys help me out.replaced intake manfold with gaskets.striaht edged new manifold and heads ok at time of repairs.has come back with same problem.leaking center ports,same as last time.last intake was warped beyound repairs.did use metal inserts for new g...
1994 Chevrolet Lumina 3.1L 3-4 shift VIN: 2G1WL54T1R
Please help I am pulling my hair out I have this 94 lumina that I rebuilt the trans on a month ago and left fine no problems and came back a month later with erattic 3-4 shift (it hunts back and fourth) in and out of overdrive I have scanned for codes none the...
1996 Chevrolet Tahoe LS 5.7L noise VIN: 1GNEK13R3T
2001 Chevrolet Silverado 1500 4.8L Return hose VIN: 2GCEC19V41
Greetings Tech Wizards. This pickup came in on the hook about 2 weeks ago with a broken shaft in the power steering pump. Not too uncommon. It had tossed the belt off which was tangled around pretty much everything and when we were replacing the pump we notice...
2001 Chevrolet Impala 3.4L Electronic VIN: 2G1WF52E11
My first time replacing an EPC solenoid on one of these. Any shortcuts? I took off left axle and trans mount. Do I need to drop the whole crossmember to pull of the side cover? Thanks for your help.
2002 Chevrolet Monte Carlo SS 3.8L Passlock System VIN: 2G1WX19368
The vehicle originally came in with a po1626 and a u1000 code and of course a no start condition,as well as no interior littes and radio not working and power locks too. After recharging the battery and disconnecting and reattaching the ground cable,I waited t...
1994 GMC Jimmy 4.3L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GKCS13W1S
hey fellow techs...vehicle came in on hook,crank no start...fuel pressure @ 28psi...replaced fuel pump...fuel pressure @ 60psi...engine starts but misfiring badly...all 3 cylinders on left side not working...pulled plugs..running extremely rich...thinking inje...
1998 GMC K1500 Sierra SL 5.7L steering wheel VIN: 2GTEK19R3W
This problem occurs only intermittently. Wose when cold. Steering wheel will shake back and forth by itself driving straight down the road. This is much more than tire shimmy or vibration. It will go away by itself. I have heard about a problem in the pressure...
2002 GMC Envoy XL SLE 4.2L transfer case VIN: 1GKET16S92
This is for you trans guys. This has the GM226HD transfer case. When you put in Auto 4 wheel drive it works. When in 4 hi or 4 low it won't turn the front wheels. Front axle is engaging in all three modes. Seems like there is something broken in t-case, but ni...
2003 GMC Savana 3500 6.0L rear differential VIN: 1GJHG39U93
We do a ton of differential work but not on Chevy/GMC. First I need to identify this unit- I know its a Dana limited slip- it has a 12 bolt cover. I have been told it may be a Super 60 or PowerLok. I am looking for the model number- either Dana's or Gm's. So f...
2003 Hummer H2 6.0L Misfire, MIL Lamp on VIN: 5GRGN23U24
This Hummer shows code P0300 and is accompanied by a slight misfire at idle. Misfire is constant and, according to MODIS scanner, misfire happens mostly on cylinder #4. We tested compression. All cyls. read roughly 150 psi. We did an injector balance test and ... Trouble codes: P0300 (Multiple misfire)
2003 Hummer H2 6.0L oil system VIN: 5GRGN23U63
Help!! Hey guys, here we go again! My wife drives a 2003 Hummer that has been trouble free from it's first day. I have serviced the engine by the maintenance schedule to a tee. I have changed the oil by the maintenance indicator and have used Mobil 1 5W-30 oi...
1984 Oldsmobile Cutlass 3.8L heater
Help driving me crazy. This vehicle has no heat. Have replaced heater core,control valve,t stat and waterpump.Found no flow at heater core when remove outlet hose I have flow but when reconnect no flow. I can take a hose and connect from heater core outlet and...
1999 Oldsmobile Intrigue GX 3.5L MIL Lamp on VIN: 1G3WH52H4X
This one has me at my wits end! Vehicle originally came in for intermittent dying condition and ses light on. Using a genysis scanner, pulled code for crank sensor circuit p0335. Monitoring the pid for crank sensor showed time B. Another tech in the shop repla... Trouble codes: P0335, P0340
2003 Oldsmobile Silhouette Premiere 3.4L coolant fans VIN: 1GHDX03E53
As far as we can tell everything is as it should be but the computer is not grounding the coolant fans to come on. Is there some info that the computer needs or has to have that it is not getting, which will cause it to not make the command for fan operation, ...
1993 Pontiac Trans Sport SE 3.8L abs
Hello! ABS-light on, my question is if I can get any codes out whithout any "Tool"? Nothing in Autodata. Thank You. Best regards Mikael
2004 Saturn Ion-1 2.2L Starting VIN: 1G8AG52F84
Hello, I have a customer with this 04 Ion complaining of a very intermittent no start, no crank. The customer says it happens about 3 or 4 times per month. Customer leaves work and when she gets in the vehicle it will not crank over. She took note that the hea...
2004 Saturn Vue 2.2L Hesitation VIN: 5GZCZ33D24
Hello all, I have a Saturn Vue here with an intermittent problem. The customer described the complaint as an intermittent bucking and no power/hesitation when starting from a stop. As I have not yet been able to experience this complaint, I can not verify if t...
2004 Saturn Vue 3.5L Hesitation, Misfire, MIL Lamp on VIN: 5GZCZ53454
Hi, I have a problem that is very new to me. I hope that one of you can help me or have seen it before. Intermittenly this Vue will just loose power and run very bad. The service engine soon, service vehicle soon, Traction control, Reduce engine power, and Ant...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet S10 Blazer 4.3L No Start VIN: 1GNCS1324M
After running all the tests that everyone suggested and trying another modual we replaced the the distributor with a reman unit and this worked. Thanks
1994 Chevrolet Astro 4.3L overheating VIN: 1GCPM19Z3R
thanks all the members who responed. i have ck water pump and it is right one. i reinstall head back to van. it was still overheating. but i have waterflow out of thermostat out. put back thermostat water stop flow. anthor shop near by recommend to dwell 1/8 h...
1996 Chevrolet Lumina APV 3.4L Cuts out VIN: 1GNDU06E3T
Well I think I fixed this van,I found an aftermarket wire tapped into the 3x high wire from the ICM.I think its for a security system or remote start.I unplugged it and it has not acted up it four test drives now. thanks goes to the ones who took the time to...
1997 Chevrolet S10 2.2L Cuts out, Stall, MIL Lamp on, GAUGES VIN: 1GCCS1445V
The problem turned out to be electrical. I noticed that the problem would occur more often when a full electrical load was on the system, (fan on high, lights on, etc..) started looking for and circuit that was heating up. touched fuseable link coming off alte... Trouble codes: P0335 (crank sensor fault).
2000 Chevrolet Malibu 3.1L overheating VIN: 1G1MD52J5Y
I would like to thank everyone for your prompt response and for the very useful technical assistance. Sincerely, Robert PS: The problem was air in the system and reservoir cap
2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W61
I went back and RE-checked all the power, grounds and wires between the ECM and ICM (and coil). I then replaced the plugs to make sure they were not the problem as they had been in the vehicle for about 2 years (we think fron customer). I then checked the dist... Trouble codes: P0351.
2001 Chevrolet Tahoe 5.3L Power Steering VIN: 1GNEK13T91
To Andy [...]; It snowed last night and I spent the morning moving cars and moving snow. I am beginning to think your vacation suggestion somewhere warm is a great idea! To the rest of you who responded, thank you all very much. The cu...
2002 Chevrolet Venture LS 3.4L reverse VIN: 1GNDX13E92
After spending time testing and going over symptoms, I was not comfortable spending the time to change the solenoid. The trans. had too many different problems. I recommended to the customer to replace the trans. I did partially disassenble it and found some l...
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