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Prev Professional Automotive Repair Technical Discussions for March 29, 2005
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Open Help Requests for GM
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1998 Buick Regal LS 3.8L customer VIN: 2G4WB52K8W
cust states "rattle noise from vehicle at times" rode with cust and found out happens mostly on right hand turns into a parking lot with a rise. abs comes in and continues to cycle even after vehicle has come to a stop. seems to me as if over sensitive. all sc...
1979 Cadillac Seville 5.7L Stall VIN: 6S69B99440
The car starts and runs well when cold, put gear in "drive" and stays running, think because its on hi idle, but when the engine temp reachs normal, the engine stall when shifting to any gear, I've already tried steping one foot on the gas in order to raise th...
1997 Cadillac DeVille 4.6L oil leak VIN: VU25122334
guys i need help, this caddy came for an oil leak, clean engine and added oil dye, ran engine and found oil leaking from rear main seal area, drop transmission and replaced rear main oil seal with new type of seal, found no one in this area had a seal installe...
2000 Cadillac Escalade 5.7L Hesitation, Cuts out, Stall VIN: 1GYEK63R4Y
Hello Fello techs. we have this 2000 esclade that was setting tps and map sensor codes. voltage on both was low .21 on tps and .04 on map. put in reman computer voltages ck fine for a while. started running bad again. what we found was we are loosing the 5 vol...
1989 Chevrolet Corsica 2.8L Excessive Emissions, Poor Idle Quality VIN: 1G1LT54W2K
This corsica has a rough idle and excessive emmisions. The most obvious data is that the O2 tends to stay rich and my fuel trims are pulling back fuel bl 100 fi 86. I was finding on the ignition scope what appeared to be one fuelinjector leaking. On a throttle... Trouble codes: 45 (rich exhaust)
1990 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC54G3L
Customer came in a with complant that car wont run. No codes ,tps is fine ,good spark . Seems like a over fuel issue. While cranking injector has heavy fuel flow.If accelerator peddal is held to floor car will crank but still runs ruff. Customer replaced fuel ...
1996 Chevrolet Lumina LS 3.1L Hesitation VIN: 2G1WN52M9T
very poor acceleration,tried everything,feels like fuel problem,plugs very clean ? lean maybe,fuel tests good tryed good maf,no help.tps is ok,when car wont accelerate tps rises with foot feed,fuel stays up,maf goes up,timing stays advanced,the only thing i do...
1997 Chevrolet K2500 Suburban 5.7L Hesitation VIN: 1GKGK26R3V
this is my own vehicle and have been trying to pinpoint jerking/hesitation condition for months now. at all speeds but worse on highway it hesitates and jerks only while maintaining a steady speed. if accelerate the slightest bit it goes away.like it is runnin...
2000 Chevrolet Lumina 3.1L CV.joint/axle VIN: 2G1WL52J1Y
Hi everyone, I have this Lumina that has unusual drive axles, we have exhausted our source (10 different axles) The end that goes into the trans on the left has been wrong (too small or wrong spline) and the other side fits but is too short. We have tried A1, ...
2001 Chevrolet Silverado 1500 5.3L front susp VIN: 2GCEK19T11
Intermittently this truck has a moaning sound when you turn the wheels. 2 weeks ago it had this moaning and also a popping noise. I knew the shaft needed the grease treatment.My boss chose to install the shaft and the dealer said it already had the new grease....
2002 GMC Yukon Denali 6.0L transfer case VIN: 1GKEK63U52
After driving and warming up drivetrain this truck "binds" when turning tight.It is an all wheel drive with no switches on the dash.The transfer case tag says it's a model #195-I have no info on this unit in MOD-in fact no one seems to know anything about this...
1988 Oldsmobile 98 Regency Brougham 3.8L MIL Lamp on VIN: 1G3CW51C6J
This vehicle has a code 26 stored at all times. Before we recieved the vehicle the Pcm, airflow sensor, tps, cmp and ckp were all replaced. Scan data shows Qdr1- hi, Qdr2- lo, Qdr3- lo, and Qdr4- lo. There are no drivability complaints, just a MIL light on aft... Trouble codes: 26 (QDR Failure)
1992 Oldsmobile Achieva S 2.3L engine VIN: 1G3NL54D1N
A korean customer dropped this off say you fix you fix. The vehcle was giving all the signs of a plugged cat then as i was testing vacume I noticed the cat glowing red so I repaced the cat vacume came up alittle and it ran a little better but still had lower t...
1996 Oldsmobile Cutlass Supreme SL 3.4L oil consumption VIN: 1G3WH12X6T
I am wondering if anyone knows if this 3.4L DOHC V-6 engine has a history of excessive oil consumption due to intake manifold gasket failures similiar to the 3.1L V-6 engine had. I checked the fix database, and found nothing with this engine in regards to this...
1998 Oldsmobile Bravada 4.3L 4x4 VIN: 1GHDT13W2W
The vehicle is a98 old bravada with a 4.3 auto trans and NV 136 fully automatic tranfer case with no selector switches. the 4wd is inop. When driven on the hoist it tries to run the front tires but you can stop them by hand. I am not familiar with auto transfe...
1999 Oldsmobile Bravada 4.3L Hesitation VIN: 1GHDT13W5X
This is a friends truck, so info is a little cloudy, but i'll give you all info i have... The truck starts ok and idles ok,when you drive it under light throttle it will accecl. (has a little noticeable hitch) but if you accel wide open it will not go, actuall...
1993 Pontiac Firebird Formula 5.7L 3-4 shift(OD) VIN: 2G2FV22P5P
Hey GM Trans Techs, I have this 93 firebird with a th700r4 that has been brought in for a transmission leak. Found the front pump and converter seals leaking, so I pulled the transmission out and replaced seals. Also replaced filter and fluid. Added lubeguard,...
1994 Pontiac Bonneville SE 3.8L hvac controller VIN: 1G2HX52L1R
Okay. I live in Louisiana and I have a problem with my personal vehicle. Whenever I select A/C the car continues to provide heat. No matter the setting, the car provides heat. My best guestimate is that there is a door to the heater core that is remaining open...
1995 Pontiac Sunfire SE 2.2L No Start VIN: 1G2J85245S
HI Guys! Well I have another one from another shop who couldn't get this thing started. They have just about put everything new on it and gave up. From what I understand this car came out from a flooded area but it looks pretty clean. At first I wasn't gett...
1996 Pontiac Grand Prix SE 3.1L lock-up convertor VIN: 1G2WJ12M4T
Customer complained of no 4th gear. Connected scanner and found it was actually no convertor lock-up. It did lock up for me once and was normal for a bit. Unlocked fine, shifted through the gears but then no lock-up agian. No trans slippage but did have slippa...
1997 Pontiac Sunfire SE 2.4L oiling system VIN: 1G2JD12TTO
The car came in with both of the exhaust valves bent on cylindar #3. The area between these valves was burnt very badly and I just put a remanufactured head from Alabama Cylindar Head on the block. I completely rebuilt the engine. When the car was first starte...
1999 Pontiac Grand Prix SE 3.8L ign lock solenoid VIN: 1G2WJ52M1X
same as above replaced lock cylinder solenoid for a problem where key would not come out of ignition lock cylinder..did good for 2 weeks and problem is happenning again
1999 Pontiac Grand Am GT 3.4L Starting VIN: 1G2NW12E2X
This vehicle will crank and start, but then shut right off. It is setting a code 1626 for "theft deterrent system fuel enable". I have tried to do the relearn procedure and it doesn't make a difference. Unfortunetly my scanner doesn't have the ability to read ...
2001 Pontiac firefly 1.3L No Start, start and dies VIN: 2C7MR5293T
Car died repaired comunication problem Now i have a start and die situation scanner does not give me a crank signal have checke all wires and conections I have tested for a signal off of the cam and crank sensor okay on a milivolt gauge very frustrated up agai...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L Poor Idle Quality, Hesitation VIN: 1G4GD2218S
well as it turns out we had multiple issues, for one the controller was replaced due to eratic sensor readings and failing the tap test. the hills and valleys in my O2 patern is due to exhaust leaks at the manifolds and cross over. after controller replacement...
1999 Cadillac Catera 3.0L MIL Lamp on VIN: WO6VR5ZR5X
Sorry so long for a fix. The part needed for this car was a little expensive,so it took a while for the customer to decide to fix her car.As many of the replies suggested,the MAF sensor was the problem.As many of the replies stated,the scan readings will appea... Trouble codes: P0171 (hego sensor b1s1 lean).
1991 Chevrolet Corsica LT 3.1L Poor Idle Quality, Hesitation, Stall
Hello again. Finally success!! I received many excellent replies on this 'classic' machine, ranging from shorted fuel injectors and bad o2 readings, to intake plenum leaks, bad fuel pumps and regulators, and most of all, bad ecms. Sure enough, a replacement ec...
1996 Chevrolet Corsica 2.2L Hesitation, Misfire, MIL Lamp on VIN: 1G1LD5541Y
Thanks to all for your help. We replaced the crank sensor with a new unit and all is well. FYI, there is a difference in the crank sensors for the two years. An engine swap from a 1997 to a 1996 (or vice a versa) will require keeping the engine wiring harness ... Trouble codes: P0335, P0341 (camshaft position range proformance).
1996 Chevrolet Express 1500 5.7L compressor VIN: 1GBFG15R8T
i am sorry i did not provide pressures for you when i posted this. i will tell you that they were ok. several replies stated they thought this was normal. i tend to believe the cycling was normal but the noise was not. lee holmes of carquest here in kansas cit...
1997 Chevrolet K1500 Suburban 5.7L Hesitation, Surge VIN: 3GNFK16R8V
Most of the replies I got said to do the tune before going any farther, we already had that sold, but that wouldn't account for the erratic tachometer. I also forgot to include the fact that there was a crank sensor code in it about a week ago. A couple of you...
2000 Chevrolet S10 2.2L calipers/vacuum booster VIN: 1GCCS1443Y
Thanks to all who answered. The condition was determined to be
2003 Chevrolet Silverado 1500 HD LS 6.0L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GCGK13U43
Thanks to all that helped on this one. After doing the propane test around the intake and watching the readings, we determined that the intake gasket need replacing. After replacing the problem was completely cured. Thanks again you guys are great... Dave
2001 GMC Savana 1500 5.7L odmeter & prndl VIN: 1GDFG15RO1
never found a good wiring diagram so we started tracing all wiring, also 2 replies mentioned bcm- this vehicle does not run one. under fuse block in left kick panel, the harness had rubbed through and shorted a main power wire, intern it melted the rest of the...
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