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Prev Professional Automotive Repair Technical Discussions for July 27, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54C8M
car came in with ck. engine light on. Scan said 41 no cam signal. Replaced cam sensor cleared codes back in 2 sec. of run. Used Mitchell on demand for flow chart. In flow chart they want 8 to 11 volts at a and b, b and c, at cmps, we only have 11 volts at b an... Trouble codes: 41 (No cam signal)
1995 Buick Riviera 3.8L Cluster,ABS VIN: 1G4GD221OS
Hi everone I have another wild one.This car came in with the complaint of different dash lights gowing off and on.Ie. Batt. light, Trac. Light, ABS light and also complaint of lack of power.I scaned for codes ABS code 25 ,26.The ABS light was not on during my ...
1998 Buick LeSabre Custom 3.8L module VIN: 1G4HP52KXW
Owner drove this car into high water created by pouring rain that was over the tires. Flooded the interior and we had to remove seats, carpet and padding to get it dryed out. After we dryed it out the air bag light was on steady and we could not get any codes ...
1994 Cadillac Eldorado 4.6L Excessive Emissions, Misfire, MIL Lamp on VIN: 1G6EL12Y9R
The car came in to have to transaxle replaced, after it was replaced another technician noticed what he thought was a misfire, i threw it on the scope and came up with bad wires. ( seen alot of these patterns before) Replaced the wires and the plugs, but the p... Trouble codes: P0076
1988 Chevrolet Camaro Iroc-Z 5.7L strange noise VIN: 1G1FP2187J
the camaro intermittently had a problem with a noise near the gas tank while shutting a door or just sitting there. i would say right off the bat that it was the fuel pump priming except that when the fuel pump is primed, it sounds much different. i decided to...
1993 Chevrolet C1500 Cheyenne 5.7L Cuts out VIN: ZGCEC19K7P
Vehicle came in running badly (terribly actually). Found timing chain off a notch. Replaced chain & gears. Still ran a bit funky. Discovered that if the TB was sprayed with choke cleaner, the missing & bucking would cease. Determined that one injector was not ...
1994 Chevrolet S10 Blazer Tahoe 4.3L Cuts out VIN: 1GNCS13W1R
This blazer boggs/surges down at about 2000 rpm even with the pedal on the floor and will continue to surge between 1600-and 2400 rpm. Until you let off. T.P.S. stays steady at switch and at ecm while doing act. thank for any idea's Pat
1995 Chevrolet C1500 Cheyenne 5.7L power door locks VIN: 1GCEC14K5S
Hello iatn fellows.i got this truck that i been working on for couple of days now.truck came from a reputable body shop. a rf door was replaced about a year ago. but this time around truck was taken to body shop for front end collision. customer stated that po...
1996 Chevrolet Camaro 3.8L Poor Idle Quality, MIL Lamp on VIN: 2G1FP22K4T
Greetings. The car came in with a "stuck throttle". It wasn't really stuck but was being commanded to idle at 2500 rpm. It had a 122 code so I replaced the TPS knowing that it would fix everything and of course it made no difference. The new TPS sweeps great o... Trouble codes: 122 (TPS Shorted or low voltage)
1998 Chevrolet S10 2.2L Mechanical VIN: 1GCCS1449W
Stalls along with check engine light. Code - U 1000 Class 2 Serial Com Problem Ever heard of this?
1998 Chevrolet K1500 Cheyenne 5.7L cluster,radio VIN: 1GCEK19R6W
Here is the story... My customer has been complaining of an intermittent problem that involves the radio clock resetting to 1:00 and the seat belt light & buzzer sporadically lighting and buzzing while driving. I was never able to duplicate the symptoms. My cu...
1999 Chevrolet Lumina 3.1L Hesitation, Stall VIN: 2G1WL52M9X
when problem occurs vdr data reads ,while eng is still running,0rpm-0egr-open loop-0 timing advance
1998 Other GM RAMBLER 275CID Unknown
hello everyone, this post is more about information than a specific problem. when replacing parts on ac system on this holiday rambler 275 horse cummings i noticed 2 check valves one on each side of the drier. i would like to know what the purpose of these che...
2001 Saturn SW2 1.9L Surge, Cuts out VIN: 1G8ZN84711
Hey guys needs some help. This saturn came in about 2 weeks ago. The customer said buck and stall after driving for about 45 minutes. I drove the car myself and it cut off once felt like ignition, check for only only one P1599 could not get the car to do it ag... Trouble codes: P1599 (cc power/ engine stall)

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M7T
to summerize the tips recieved they centered around cleaning the egr ports in the intake manifold. the problem remained even after doing so I was unable to get egr to activate 100% of the time using the scanner and verified there was no signal at the wire at... Trouble codes: P0401.
1998 Buick Park Avenue 3.8L abs module VIN: 1G4CW52K3W
First of all I would like to thank the people that responded. The first response had to do with not replacing parts with used ones form a JUNKyard witch is a good practice I agree. Another reply was that Mitchell did not offer any more trouble shooting informa...
1989 Cadillac DeVille 4.5L Refrigerant Line/Hose set VIN: 1G6CP5335L
Thanks to all who responded regaurding the bracket on the rear of the a/c compresor. We had a similar Cadilac in the shop today and verified that there indeed is supposed to be a bracket. We have advised the customer that further repairs are needed and are now...
1999 Cadillac Seville STS 4.6L long crank time VIN: 1G6KY549XX
Hello everyone! We received three replies to our post, and Stephen from Florida hit the nail on the head. We monitored ignition 1 voltage with our Tech 2. Ignition 1 voltage went to 0 when the fault was induced. As he suggested, we replaced the ignition switch...
1984 Chevrolet C10 Suburban Custom 5.0L rear brakes VIN: 1G5EC16H9E
well here it is everyone. we replaced the rear shoes again and had the drums machined. we think that the drums were egg shaped and causing the adjujsters to adjust up while driving. we havent seen the vehicle for 3 weeks now. thanks again to all who replied it...
1993 Chevrolet Astro CL 4.3L Hesitation, Cuts out VIN: 1GNEL19W6P
After several attempts to check and double check parts and new parts, this has proven to be quite the challange for me. Several suggestions were made to check the injector body and fuel lines inside the intake plenum (that is my thought also, it is about the o...
1996 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: IGNDT13W8T
thank to all for the help finding this problems. one problem was the o2 heater failed on bank one sensor three and the other was the distributor cap had an internal short, which shorted clyinders one and four, we could see no visable problems with distributor ... Trouble codes: 300 (multiple missfire), 147 (o2 heater), 155 (o2 heater).
1997 Chevrolet C1500 4.3L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCEK14WOU
the truck went back to previous shop that had just installed a new fuel pump from the zone,we recommend a complete unit from the dealer. when the system got real hot, the fuel volume would drop causing the driveability issue. the pressure was allways up. thank... Trouble codes: P0131, P0151.
1997 Chevrolet K1500 Cheyenne 5.7L Brake lights VIN: 2GCEK19R7V
Big thanks to Michel from Texas. Pain in the but to find, but I got it and got the customers brake lights working. Was also hoping this would solve his cruise control issue, but no such luck.
1998 Chevrolet C3500 Cheyenne 7.4L system voltage VIN: 1GBKC34J5W
OK, I think we've finally fixed this one. Turns out source of problem was a damaged (melted) wiring harness at left rear of intake manifold in proximity to EGR tube. Repair damaged wires, insulated, and wire tied up away from heat source. We've driven almost a...
2000 Chevrolet K3500 7.4L MIL Lamp on VIN: 1GCHK33JOY
Hi, Thank you to all that responded. I followed the suggestions, had the injectors tested & cleaned all ok, replaced cap, rotor, wires, plugs. Code rich rt bank returned, switched sides with O2 sensors. Customer took on a trip, light came back on, went off a... Trouble codes: 175 (Bank 2 Fuel Trim Rich).
2002 Chevrolet Impala 3.4L low coolant light on VIN: 2G1WFSSE82
Thanks to all that responded, just about everyone said that the coolant level sensor was the problem. Was unable to get it to fail when testing, so I took your advice and just replaced it. It has been about two weeks now and the light never comes on. Thanks ag...
1965 GMC 910 5.8L Poor Fuel Economy VIN: 0C91534807
Thanks to all for the information, basically just trail, error and lots of time. set the timing at 25 degrees at 2500 rpms. seems to work fine, and customer said it works much better. But till crappy on gas. Thanks again for everybody help!
1997 GMC Jimmy SL 4.3L air bag VIN: 1GKDT13W2V
we got this one fixed thanks to john's reply,the air bag module was bad,john said to check for 36 volts at the arming sensor with it unplugged and we only had 30 volts,replaced module with a used one from salvage yard and truck was repaired,thanks also to art ...
1999 GMC K2500 Suburban 7.4L abs VIN: 3GKGK26J9X
thanks for all your help removed the sensors cleaned mounting surface reinstalled problem fixed thanks again dave
1992 Pontiac Bonneville SSEi 3.8L No Start VIN: 1G2HY521XN
I got this one fixed. As i said the last thing I tryed was a new crank sensor and conector which made no change. What I ended up doing was replacing Ing. Mod. and new coil packs. The car now runs great. There was some small cracks on each of the coils.How this... Trouble codes: 13 (o2 sensor circuit open short or bad), 18 (crank signal open or no signal), 58 (vats system problem).
1998 Pontiac Grand Prix SE 3.8L Air Bag Code VIN: 1GWJ52K1WF
Sorry for the delay. The customer was scheduled to return a couple of weeks later. In the mean time he stopped by and said that since we worked on it the light has stayed off. So he dosen't want to do anything until it comes back. We will let you know if he re...
2002 Pontiac Grand Am SE1 3.4L ABS speed sensor circuit VIN: 1G2NF52F62
Found severed wires in the rt front wheel speed sensor harness below the transmission. Transmission apparently rubbed thru. As for left rear wheel speed sensor being inoperative must have something to do with the snap on modis. Not sure why it didnt pick it up...
1995 Saturn SL1 1.9L Oil Leak VIN: 1G8ZG528XS
Several of you suggested a possible cracked head or that the TTY bolts might have been reused when the Saturn reman head was installed causing leaks at the head gasket We removed the timing cover, found that the silicone sealer had not properly sealed at the j...
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