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Prev Professional Automotive Repair Technical Discussions for September 10, 2007
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Open Help Requests for GM
Help Request Answers
1993 Cadillac DeVille 4.9L Stall VIN: 1G6CD53B4P
This vehicle has an intermittent stalling problem which occurs mostly when the A/C or the heater are on. The vehicle will stall on decel, while turning, and while applying the brakes. Since this problem occurs 10-15 times a day the vehicle has become unsafe to...
1994 Cadillac DeVille 4.9L compressor VIN: 1G6KD52B3R
Hello, I have this caddy here and the A/C compressor will turn on when at first start up for about 1 min. It will shut off and then every few mins it starts for about 5 secs and shuts off for a while and repeats. At first when you start the car everything is n...
1996 Chevrolet K2500 Suburban 5.7L lean VIN: 3GNGK26R6T
GLOWING HEADERS---I married this truck, so I purchased it from customer, I resealed the intake manifold and plenum, replaced exhaust manifolds with shorty headers, replaced fuel pressure regulator and full tune up. Now I have a good running engine exept the he...
1998 Chevrolet S10 LS 2.2L Starting VIN: 1GCCS1947W
Hey there guys, I have this S-10 that came in for a grinding noise. The customer had replaced the starter himself and used a "Auto chain" not reputable for dealing with shops- if you know what I mean... Anyway, this is a intermittent problem. What seems to hap...
1998 Chevrolet Venture 3.4L Misfire, MIL Lamp on VIN: 1GNDX03E2W
car started out running fine. after about 2.5 miles car started skipping, check engine lamp came on and also stared flashing at times. scanned and found above codes. pid on scan tool inj 2 circut stuck low did flash to yes while skipping. i've come down to inj... Trouble codes: P0202 (injector 2 ckt fault), P0302 (misfire cyl2), P0300 (multiple misfire)
2001 Chevrolet Malibu 3.1L alternator VIN: 1G1ND52J21
This car has a reman alternator and new battery. The alt. will be charging and then cut out. I have tested the alternator and it tests out fine. I have put a 10 minute load to the system and it will give me peak amps and satisfactory voltage without cutting ou...
2001 Chevrolet Silverado 1500 4.8L Misfire, MIL Lamp on VIN: 2GCEC19V41
Hello techs, the customer says the CEL light started flashing a couple of days ago. I found code Po300 random misfire. Just a little more quick history before I go on. The engine became an oil burner @ 90,000kms(not sure why) and the customer was complaining o... Trouble codes: P0300
2002 Chevrolet Cavalier 2.2L Surge VIN: 1G1JC52482
This vehical keeps setting a p0122b DTC. I thought I had captured a glitch when hot so I replaced the TPS but the code keeps returning. Always a "B" DTC. I have now experienced this on one and only one ocasion. At approx 20 mph the car surges as though it is t... Trouble codes: P0122
2003 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEC16Z33
Thanks in advance to everyone willing to give a helping hand. I have this Suburban that all of a sudden started running rough. Scannned for codes only p0300. Misfire counter shows #8 constant misfire and #7 misfire at idle. Checked plugs and wires looked OK bu... Trouble codes: P0300
2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Poor Fuel Economy, NO POWER,BOGS VIN: 1GNDS13524
vehicle has no engine light on. starts and idle good wont hardly go over 45-50 mph. as soon as you throttle up you hear the engine bog down and hesitates take an extended period of time ti get up to speed. converter is good , transmission checks out . ran fuel...
1992 Geo Tracker 1.6L No Start VIN: 2CNBJ18U5N
Hi, again. This 92 tracker has spark but no injector pulse. No codes. If I put an oscilloscope on the white wire (crank angle sensor wire) I get a nice square wave signal (about 5 volts) while cranking. Again, with good spark but no injector pulse. If I use a ...
1999 GMC Yukon Denali 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)
1991 Oldsmobile Delta 88 Royale Brougham 3.8L all Shifts VIN: 1G3HY54C7M
Dear GM Techs, Hopefully you can help me here on my own car. This oldsmobile with a 3800 and auto transmission. Recently i have had a little torque converter chatter at 30-35 miles per hour, felt like a miss so i tuned up(did have a bad plug wire), still did l...
2001 Oldsmobile Alero GL 3.4L security VIN: 1G3NL12E41
Hi, folks. This alero very intermittantly will not start and the security indicator flashes indicating the BCM did not receive a valid passlock signal. Codes this last incident were B2960 (incorrect or invalid passlock signal) and U1000 (serial data communicat...
2001 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL12T11
Thank you in advance or your time. This vehicle had an intermittent hard start. When it sat for a while, it would turn over a few times before it would start. Tested and found that I was losing fuel pressure while sitting. The fuel pressure regulator was leaki... Trouble codes: U1000 (No State of Health from Module)
1996 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52K6T
About 2 months and half ago I replaced the fuel pump with a carter pump,and 3weeks later it wouldn't start again so the cust banged the fuel tank and it started,so I warranted the fuel pump this time I installed a A/C delco pump,then alls good for about 3 week...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Regal Custom 3.1L interior lights VIN: 2G4WB52M4S
first off i want to thank all of you for the advice. this one ended up being a real challenge.i was able to locate the remote door unlock module it was mounted uner the dash on the passenger side of the vehcile.afterunplugging it and retesting i again got the ...
1994 Chevrolet C3500 6.5L MIL Lamp on VIN: 1GBJC34F8R
1995 Chevrolet K2500 Cheyenne 7.4L Evapotator VIN: 1GCGK29N4S
The customer has had the vehicle for 4 weeks and has not complained of any problems. true fix can't be verified due to the fact of replacing the orifice tube, receiver/dryer, compressor and three different pow pressure switches. thanks for all the help and s...
1996 Chevrolet Lumina 3.1L brake/directional lights VIN: 2G1WL52M4T
Thanks for all the help. Since things didn`t make sense I put a 2nd New directional switch in this morning and all is well. I wasted much more time checking things than repair took, but these things happen and goes quicker 2nd time. Thanks agaian
1997 Chevrolet P30 7.4L Mechanical VIN: 1GBLP37J33
We found the left front wheel sensor signal dropped out below 5 MPH. This was caused by a piece of melted plastic in one of the reluctor ring grooves. We cleaned this out and tightened up the air gap. The brakes are working properly now. No code was set becaus...
1999 Oldsmobile Intrigue GL 3.5L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, mil not always illum VIN: 1G3WS52H4X
I figured that with the anti theft, inproper key in ign. codes, communication problems and data link loss, that I had a ign. switch , and possible BCM problems. After a few hours, I was to scaried to call expensive non returnable items. Sent it the dearship. C... Trouble codes: 1602 (loss of ABS Serial data EBTCM to PCM set with no light sometimes).
1999 Pontiac Grand Prix SE 3.8L Electronic VIN: 1G2WP5K1XF
I checked the wiring harness next to the accumulator and the wiring looked OK. Returned the car to the customer and hasnt been back.
2004 Pontiac Aztek 3.4L High Presure Line VIN: 3G7DA03E24
The problem is not completely gone but much less frequent. Thanks to Erick, Mark, and Allan for their suggestions. I found out that the system has and H type expansion valve and a drier hiding way under the front grill cowl. The TXV is inside the dash an...
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