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Prev Professional Automotive Repair Technical Discussions for February 22, 2005
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Open Help Requests for GM
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1992 Buick LeSabre Limited 3.8L abs light on VIN: 1G4HR53L3N
abs light on,scan system codes,37left rear sensor at zero,code 45 left front inlet valve circuit failure,after extensive testing of system,all sensor resistance are ok,pass ac output at each sensor and at abs module,wiring connectors are ok,relay was replaced....
1995 Cadillac DeVille 4.9L vibration VIN: 1G6KD52B7S
Car was brought to me after transmission was rebuilt and customer was feeling vibration after converter lock up. I have noticed vibration there also without converter lock up and it is not as noticable. Can not find miss fire problem doesn't feel exactly like ...
1998 Cadillac DeVille 4.6L Blower motor VIN: 1G6KD54Y4W
The Blower motor does not work. I have three wires. Red constant voltage, Black ground. Grey, not sure. I understand so far that it comes from the acm and controls blower op and speed. I read a fix archive that said it was a low varying voltage only visible wh...
1984 Chevrolet Corvette 5.7L no shut off VIN: 1G1AY0784E
Greetings, This vette towed in for new longblock, transplant went well and now the fun begins. In the column, we can turn key and provide power to the dash, and accesories, and turn the key back and shut them off. When we turn the key and actually start the c...
1993 Chevrolet G20 Sportvan 5.7L battery VIN: 1GBEG25K2P
HELLO, I have this van that is not driven very often, but the owner starts it up every three days. Over the last three weeks he has to jump it off on the third day. He has changed the battery with no success. I have been chasing a battery drain of 0.097A. If i...
1995 Chevrolet Blazer 4.3L 4 wheel drive not wo VIN: 1GNDT13WXS
we had worked on this car previously. the first time it was here for the 4 wheel drive not working, we unplugged the transfer case control module and plugged it back in and it started working. we replaced the transfer case control module with a new one from de...
1996 Chevrolet Blazer 4.3L Transfer Case VIN: 1GNDT13W7T
I am trying to troubleshoot the Electronic Transfer case system on this vehicle. It has the 3 buttons on the dash, not the floor shifter system NV 233. Basically the lights flash on the dash, & the 4WD system doesn't really respond.It came in with a P1875 code...
1996 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GCEC14W9T
the truck misses between first and second gear.but it seems to get better the longer you run it.i know it sounds like a wet problem,but some times it runs good when damp.
1997 Chevrolet Blazer 4.3L No Start VIN: 1GNCT18W2V
Hello Everyone, I know it's been a long time sense I've particapated in the forum, but Uncle Sam had me otherwise occupied the last two years. I came back to the shop and I've got this problem child that has stumped me for the last three weeks. It's a '97 4.... Trouble codes: P0338 (Crankshaft position sensor circuit high frequency)
2001 Chevrolet Silverado 3500 6.6L No Start, MIL Lamp on VIN: 1GDJC3Y111
Customer states that truck starts fine when cold but has to ether it to start when cold. Sometimes driving it won't run but [...] and loses power. This is only the second Duramax I've ever seen so I'm totally blind. I hear there's a lot of trouble with the ...
2001 Chevrolet Cavalier 2.2L Pressure control selenoid VIN: 1G1JC524X1
Customer complaint was TRAC OFF light was on. Check for codes and P0748,C1275 in history. Road test and codes reset as current codes. C1275 i believe is because of P0748 setting. Check PC selenoid circuit and resistance OK, within specs. Replaced PC selenoid a...
2003 Chevrolet Cavalier LS Sport 2.2L clutch VIN: 1G1JH12F53
when clutch pedal is pressed, almost sounds like fan is being turned on, but i know its not. no driveability problems. if anyone has had this problem, please let me know what it is,
2003 Chevrolet Silverado 1500 4.3L Excessive Emissions, MIL Lamp on VIN: 2GCEC19X63
This truck ever sence it came from bodyshop has had a ses light on & code P0128. The body shop replaced coolant temp sensor but no change. My snap-on scanner shows ect -40 degrees, intake air temp -40 and baro -.55 volts all the time. Tested for 5 volts from s... Trouble codes: P0128 (engine coolant temp sensor circut)
1992 GMC Jimmy SLE 4.3L Hesitation, Surge VIN: 1GKDT13W5N
This is an odd one. driving normally i have no problem, but when i go to hammer the gas nothing. I can hear the motor trying to go but no downshift. went to go check the timing, disconnect EST plug, and the motor starts to surge. I have a feeling that it may b...
1997 GMC Safari SLE 4.3L Gauges VIN: 1GKDM19W6V
This van is driving me nuts. Original complaint dash guages inop. I bring it in and notice that the compass and the odometer and the PRND123 do not light up either. All the dash lights work, such as ABS Service Engine Soon etc...and dash illumination lights do...
2001 GMC Sierra 1500 SL 5.3L MIL Lamp on VIN: 1GTEK19T01
All the related repair history is over 2 months time. Truck would sometimes, usually cold but sometimes at cruise miss loose power, not pull. After 1-5 minutes would clear up, run fine, maybe rest of day or ok for 3-4 days. Well back today, lean bank codes p01... Trouble codes: P0300, P0171, P0174
1992 Oldsmobile Cutlass Supreme 3.4L Excessive Emissions, Poor Idle Quality, Surge VIN: 1G3WR11X5N
I am unable to get the NOx to come down any further... the car has failed the Nox part of the test 3 times now it's better but still twice the limit.(limit- 408 reading 818)When i first started the Nox was reading somewhere around 1580... way over the limit. i... Trouble codes: 33 (EGR Valve Malfunction)
2001 Oldsmobile Alero GL 3.4L Gaskets? VIN: 1G3NL52E91
This engine has a small amount of oil in the coolant reservoir. Owner states they have also had to add about 1/2 to 3/4 gallon of water in the last 3-4 months. No indication of water in the oil. No noted external coolant leaks. Owner states he has seen some wa...
1994 Pontiac Grand Prix SE 3.1L interior lighting VIN: 1G2WJ12M4R
well all this one is my cornwell toolmans sons car im using mitchell on demand wiring diagrams car came in for brakes and also securty light on (fixed). and interior lights staying on once started. interior lights wont come on when opening door switch test goo...
1995 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB5241S
Car was brought in for external coolant leak at cylinder head (common for this engine), and a misfire at idle. The head was resurfaced and the gasket was replaced. The leak is fixed, but two and a half weeks later, I still cannot find the cause of the miss.I h...
1998 Pontiac Grand Am SE 2.4L Oil Pressure/Compression/Vacuum VIN: 1G2NE52T5W
This Grand Am (2.4) has high oil pressure and high compression test readings, along with low vacuum. Oil pressure at idle is a erratic-40 to 50 psi. At 2000 rpm it will spike and peg my gauge out at 100psi. Oil pressure reading is sort of all over the place bu...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Skylark Limited 2.4L Poor Idle Quality VIN: 1G4NJ52T6V
Fellow Techs, Thanks for your responses. Suggestions included; 1. Use Fel-pro gaskets 2. Make sure that manifold support is in place. 3. Possible improved bolts from GM 4. Poor design Thanks again,
1969 Chevrolet Corvette 5.7L Windshield Wipers VIN: 194379S728
Thanks to all that replied, especially Thomas [...] for emailing the wiring diagram so quickly. After tracing wiring and grounding the wiper switch, (Thanks Bruce) The problem was the park contact inside the wiper motor was burned, Replace motor assembly with ...
1993 Chevrolet C3500 Silverado 6.5L overdrive VIN: 1GCHC33FXP
THANKS to all who helped with the limited info ya'll had to help me with. The problem is fixed.(The real test will be driving it for a few weeks) The TSP and the tricky adjustment(alldata has the settings) was the problem. It's now working fine and I really ap...
1994 Chevrolet Caprice Classic 4.3L MIL Lamp on VIN: 1G1BL52WXR
thanks for all of the replies,special thanks to david [...].turned out to be a bad canister purge solenoid.we followed the tests per alldata and it checked normal.upon discussion with the tech it had been an intermittent problem.also there was a different code... Trouble codes: 26 (quad driver moduler 1 faut).
1996 Chevrolet Blazer 4.3L Runs Rich VIN: 1GNCS13W0T
We Replaced The Fuel Pressure Regulator, Cutomer Drove It For 4 Days. Problem Is Corrected !! Trouble codes: P0172, P0175.
1998 Chevrolet Blazer 4.3L Transfer case VIN: 1GNDT13WXW
Thanks to everyone who replied, With all the great replies and our troubleshooting it pointed towards a bad encoder motor but, unfortunately, the customer elected just to live with having 4hi for now. He didn't want to pay for a new encoder motor at this time....
1998 Chevrolet Cavalier LS 2.4L intake manifold VIN: 1G1JF52T7W
Fellow Techs, All replies said to replace manifold due to warped mating surfaces. Thanks for your insight.
1999 Chevrolet Tahoe 5.7L 2nd &4th Gear VIN: 36KEC16R4X
I received many replies most said band broken, but i could see that it was alright.It ended up the one of the seals on the 2-4 servo piston had a big gap missing in it.Thanks for the help.
1999 Chevrolet Tahoe LS 5.7L steering wheel VIN: 1GNEK13R6X
jon from louisiana and alan from texas hit the nail on the head with the front wheel bearings. there wasnt any noise or play in them that we could see but it sure fixed the problem. i ruled out torque converter shudder by applying the brake as many of you sugg...
1997 Geo Metro LSi 1.3L condenser fan VIN: 2C1MR229XV
Hello Friends: Thanks for your help. I was a little crazy with this vehicle, my wiring diagram was wrong in that part, with your info I checked the system and works O.K the pressures I got 30 Psi and 200 Psi, the temperature inside the car 5 C. The system mad...
1997 GMC 6500 3116CC No Start VIN: 1GDJ6H19VJ
WE replaced the two check valves in the fuel transfer pump and replaced all the gm plastic fuel lines. We tried to start after weekend but batteries were dead Installed two batteries and started this morning vehicle starts with out any problems now thanks to a...
2000 Pontiac Grand Am GT 3.4L gauges,heater,DRL,windows VIN: 1G2NW52E4Y
Thanks guys, it seems that the ignition swiych is the most popular possibilaty on this car so I will be changing that first. A couple of other odeas included shaking the harness under the power dist. box which I did and did not change the problem. Another was ...
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