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Prev Professional Automotive Repair Technical Discussions for September 19, 2007
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Open Help Requests for GM
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1997 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on VIN: 1G4HP52K9V
This car has the light on and the misfire counter shows #4 misfiring. i can barely feel a miss in engine. when it is of of idle, the counter does not show miss at all.noid flashes on #4 I suspect the injector driver because of the code but cannot pinpoint the ... Trouble codes: P0300, P0304, P1200
2001 Buick Regal LS 3.8L lf window VIN: 2G4WB55KX1
hi folks, have this buick here with repeated lf window burn out just wondered how long the express down stays energized before it clicks off. this one stays on for six seconds. seems long to me. motor draw goes to 20 amps with the motor stalled for six seconds...
1992 Cadillac Fleetwood 4.9L compressor VIN: 1G6CB53B6N
My question is there a known problem with using freeze 12 in the old r-12 systems using the original mineral oil as I've had 2 compressor failures using freeze 12 but they were both on very high mileage cars.
1996 Cadillac Seville SLS 4.6L No Start, inst. cluste quits VIN: 1G6KY52983
this car will intermitantly not start due to vehicle theft deterent system then will start up, then the instrument cluster will just quit working some times driving down the road then will come back on line can not duplicate in the shop no other driving or run... Trouble codes: P1602, P1604, P1626
1998 Cadillac DeVille 4.6L Theft System Problem VIN: 1G6KD54Y2W
Hello techs, I have a 1998 Cadillac DeVille that displays in the message center "Theft System Problem Car May Not Restart". But the car starts and runs everytime all the time. The vehicle has the Pass Lock II system with the key pellet. Not the Pass Lock III w...
1994 Chevrolet Cavalier Z24 3.1L Condensate leak VIN: 1G1JF34T2R
Thanks in advance for your help, guys. This is my wife's car. The carpet, particularly on the passenger side, gets VERY wet when the car is driven with the A/C on. I have removed the rubber elbow on the engine side of the firewall where the drain pipe comes ou...
1998 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R7W
engine was running fine, no codes washed\degreased engine started backfiring,did major tune up plugs, wires, cap, rotor,fuel\air filter, misfire\backfire gone engine back running fine, but code 1345 ckp\cmp correlation problem now intermittently pops up i susp... Trouble codes: P1345
1999 Chevrolet C1500 LS 5.7L Poor Idle Quality, Misfire VIN: 87CEC14ROX
Hi all This truck came in with cil. 2 and 7 not working so I changed the cap and rotor- no change. Cleaned inyectors and tested on bench and all work even. Scaned and no codes appear. Changed the plugs on 2 and 7 . Checked compresion and is oK for the Ks the t...
1999 Chevrolet Corvette 5.7L Automatic Door Locks and Loss of Key Fob Memory VIN: 1G1YY32G4X
Hello to all we have a 99 vette that has a problem with the automatic door locks and a "loss of memory" on the key fob. We have used new fobs with the same rusults, works for five to ten minuites then nothing.We can reprogram as soon as it stops working,works ...
2001 Chevrolet Corvette 5.7L active handeling VIN: 1G1YY32G01
I HAVE A 01 CORVETTE WITH A INTERMITENT CODE C1287. The scaner i am using is the snap on brick wich does not support some of the test in the diagnostic charts . The owner of the car also says the cruise control wont hold after a couple of miles. Wich i have no...
2001 Chevrolet Silverado 2500 HD 8.1L speedometer VIN: 1GCHK23G21
Hi everyone, This truck came in with a speedometer not working. All other gauges seem to be fine. We checked for a speed signal from the speed sensor and that worked fine. (It displays the vehicle speed on the scanner, but not on the speedometer.) We have repl...
2002 Chevrolet Camaro Z28 SS 5.7L Oil Pump VIN: 2G1FP22G12
I have an LS1 motor that at idle oil pressure drops to Zero. When the RPM is increased to 2000 pressure increases to 40 which is within spec per the GM service manual. I have verified that the gauge is correct. The oil pressure does not linearly increase with ...
2004 Chevrolet Silverado 1500 5.3L Braking VIN: 2GCEC19T44
truck came in with soft pedal, test drove fond that the pedal would ingauge have way down and as coming to a stop would go to flour no leaks found, no air in system no codes and speed sensore are working we have been trying to correct this for 6/8 months what ...
1995 GMC Safari 4.3L engine VIN: 1GDDM19W1S
hi guys and thanks in advance for the help this one came in with a long crank (10 to 15 sec.) before starting, then surging after started. then on shut down it will start right back up but surge about 4 times then settle to a good idle let the vehicle set for ...
1997 GMC Yukon SLE 5.7L heater system VIN: 1GKEK13R8V
Customer said no heat coming from duct work verified checked temp at heater control valve with temp gun 179 but noticed control valve is shut all the time disconnect solenoid for heater control and it heats great but all the time does anyone know if they had a...
1999 GMC Yukon Denali SLE 5.7L Stall, Misfire, MIL Lamp on, Stall at stops VIN: 1GKEK13R8X
Vehicle came from another shop that replaced engine. After that codes P1345 and P0300 appeared . They worked on it for more thant a month trying to get rid of these codes, stalling at stops, kickback on hot restart. Cam and crank sensors have been replaced by ... Trouble codes: P1345 (ckp/cmp position correlation), P0300 (Random Misfire)
2002 GMC Yukon SLE 5.3L MIL Lamp on VIN: IGKEC13Z92
Vehicle runs great. Imtermittently the "SES" light comes on and goes off. We are getting code PO332 (low voltage). We can't find any information or flow chart on Mitchell. Is the solution to pull the intake manifold and replace both of the knock sensors? Trouble codes: P0332
2005 GMC Canyon Z71 SL 3.5L blower motor VIN: 1GTCS196X5
hello out there in iatn land. my customer's fleet truck will intermittently loose blower operation on ONLY speeds 2 and 3!!! when we recieved the vehicle, all systems worked good. replaced the blower motor resistor/module because it was cheap and easy and ofte...
1997 Oldsmobile LSS 3.8L fuel gauge VIN: 3G2H12BT2V
I HAVE THIS OLDSMOBILE LSS About 30 seconds after starting the fuel gauge drops from the full mark to empty. I checked sending unit resistance which is 320ohms. The resistance is too high so it needs a sender but a low resistance, approx 40 ohms, would cause t...
1995 Pontiac Bonneville SE 3.8L lack of acceleration VIN: 1G2HZ52K3S
vehicle has lack of power on accel. good fuel pressure, exhaust clear, had transmission checked. all scan data looks good accept for retarded timing. replaced knock sensor (both),car ran better but had ses light. knock sensor code. had bad one replace and car ...
1997 Pontiac Grand Prix SE 3.8L fuel gauge VIN: 1G2WJ52K6V
This vehicle had a fuel gauge that would move up and down from full to empty while driving. The sender was working smoothly. Tracing the fault led us to the cluster assembly. This was sent out for repairs. We reinstalled the repaired unit only to find that the...
1997 Pontiac Grand Am GT 3.1L Timing ? VIN: 1G2NW52M4V
At our customers request we replaced his engine with one that he picked up. Problem... his engine was a 2003 his car is a 1997 The yard he used said no problem just switch intake and sensors... We did and now have a no start seems like it is out of time... Aft...
2002 Saturn L300 3.0L All passenger locks VIN: 1G8JW54R02
Passenger door locks, slowly and unevenly, unlock during test drive(long test drive). Clicking noise under passenger dash accompany this event. No current codes in BCM and Engine code P1632 Theft sys/fuel disabled present. BCM history code B0005 In park switch...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Roadmaster Limited 5.7L Hesitation, Surge VIN: 1G4BT5372N
I performed all tests that were sent to me. I eventually put on a Carquest fuel pump and had same problem. I then removed fuel pressure test equipment from TBI unit and vehicle runs properly both cold and warm. Must have been a restriction in testing equipment...
2004 Cadillac CTS 3.6L abs VIN: 1G6DM57764
Thanks for the help on this. Joe [...] hit it on the head. Fix the wheel speed problem and the service brake assist message will go away. Sorry about the delay on the fix but the customer was busy and could not let go of the car.
1990 Chevrolet P30 Step-Van 7.4L no power VIN: 1GDKP32N1L
2003 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEC16Z33
Well thanks to all for the ideas. The valve spring was bad on #8. The problem with #7 must have been because of the miss on #8. Thanks again to everyone. Trouble codes: P0300.
2004 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Misfire, 4 cylinders dead VIN: 1GCEC19V04
Hey guys! First of all thank you to everybody that took the time to think about this one. Turns out it was the right bank front 02 sensor. When the problem occurred the 02 would slowly bias lean, causing rich condition on all 4 cylinders. Only thing is the fue... Trouble codes: P0300 (random misfire).
1985 Oldsmobile Cutlass Salon 5.0L Hard Start VIN: 1985OLDSCU
Carb did not leak, fuel pump was new... We put a check valve (one way valve) in line and the problem is GONE !!! We did find that the pickup was modified (for whatever reason) this may have caused the drain of fuel lines and carb. Thanks to all who take the ti...
1999 Pontiac Grand Am SE 2.4L Misfire, MIL Lamp on VIN: 1G2NES2T4X
Thanks everyone for all the help I recieved. It seems like I fell for the oldest trick in the book, I believed that a new part must be a good part. The coil cover had an internal misfire between cylinders. I replaced it and the misfires went away. The car is ... Trouble codes: P0300.
2000 Saturn LS2 3.0L No Start, Stall VIN: 1G8JW52R5Y
first thanks to all who replied;i was looking for some reinforcement for my origional thought and got ,yes the crank sensor appears to have fix the unit... iATN rocks. Trouble codes: P0335.
2001 Saturn SL1 1.9L 2-3 shift VIN: 1G8ZH52801
Thanks to the 3 who responded. One response said to have the computer reflashed. Two respnoses suggested driving to have module relearn. I chose to drive the car. After about 30 upshifts and downshifts through each gear, the relearn seemed good and I gave the ...
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