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Prev Professional Automotive Repair Technical Discussions for March 30, 2006
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Open Help Requests for GM
Help Request Answers
1987 Buick Century Estate Wagon 3.8L No Start VIN: 1G4AL8136H
Hi Techs, Car came in with timing sprocket stripped& cam sensor broken. Customer states car was running when timing chain stripped. We replaced timing chain assembly, interupter,cam sensor with parts from GM.Tried to start, no spark or injector pulse. We follo... Trouble codes: 41 (Cam sensor circuit)
2000 Buick Regal LS 3.8L Engine VIN: 2G4WB52K5Y
Hey Guy's here I am again this vehicle is giving us a fit. It all started with the dash lights coming on when either turn signal would be selected. I looked at the schematics on Alldata and everything goes thru the BCM. The customer decided to put the BCM in a...
1965 Chevrolet Corvette 327CID Fuel Gauge VIN: 194675S127
Hello all, needs some help from you guys. I have a fuel gauge that is inop. It has a three wire sender and two wire gauge unit. According to mitchell vintage one wire to the sender is ground and the other two go to the gauge. SO where is the power to make it w...
1990 Chevrolet K2500 Cheyenne 5.7L steering pump VIN: 2GC6K29K5L
This truck has burned up three P/S pumps. Fluid get hot and pump quits pumping. Takes about 1/2 hour running in park. No visible restrictions. Return line flows well. First reman pump went one day, second one never left the shop
1991 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Stall VIN: 1GCEC14Z3M
The truck runs well, idles smoothly in park, but will not idle in gear. Scan tool shows IAC counts drop when shifter moves from park position. IAC counts 27 at idle in park, but slowly drop when PRNDL switch moves. Does not require trans gear engagement to ach...
1993 Chevrolet G30 Beauville 5.7L Hesitation, Cuts out, Stall VIN: 2GBHG31K2P
this is a large delivery van for a local tv store, it's seen better days. anyway it comes in for a lack of power concern. i drive it and it runs fine. called the customer and they said that it needs to go 60-80 miles before it will act up! so i let it sit outs...
1995 Chevrolet Caprice Classic 5.7L Fuel pump VIN: 1G1BL52P7S
Hello everyone Got a stumper here and I'm asking for some ideas.Car was towed in with a starts,runs briefly and dies out.We determind low fuel pressure and replacced the pump.I might ad this car sat for a very long time and there is a lot of rust everywhere.Ok...
1996 Chevrolet Lumina 3.1L Poor Idle Quality VIN: 2G1WL52M1T
the 96 lumina has a high idle problem. start up 1500 rpm thenmaybe drop to 1200. 1200rpm is the lowest it will run.when the engine get to 212f and the fans kick on iac motor up 1350rpm and when the fans shut off idle stays at 1350 or goes higher 1400rpm.if you...
1997 Chevrolet C1500 Cheyenne 5.7L pinging VIN: 2GCEC19R6V
Hi guys This is the case of the pinging chev. After looking at the archives I went back and checked egr, working 5 and 7 plug wire not touching fuel press ok, ac plugs installed did have bosh. Customer said it started after they got some bad gas??? They sent o...
1999 Chevrolet Tahoe LS 5.7L Starting VIN: 1GNEK13R5X
replaced intake gaskets due to coolant leak delivered truck only to get the dreaded it wont start call went to location and there was no light indicating veh was in park checked with scanner gear pos was 3 went thru fuse check when i touched #8 fuse on int fus...
2000 Chevrolet Silverado 1500 5.3L No Start
I want to pick some good minds here. I've seen this many times, and now I want to see if anyone can do this. My customer's truck will on occasion not start because of the passlock system not functioning at the moment, and then will start and run fine half an h...
2006 Chevrolet aveo 1.6L Stall
Need help vehicle came in a month ago with a reduced power problem. would not go over thirty mph. had three codes stored. sorry codes not available at this time. found tsb to check for ice on throttle plate. checked and none found. but replaced the throttle bo...
1994 Geo Prizm 1.6L 3/2 down shift when A/c button pushed VIN: 1Y1SK5361R
this car has after market add on air conditioning when in third gear no matter up hill down hill or level when ac button is pushed it will down shift into 2nd and stay there
1998 GMC K1500 Sierra SL 5.7L In the truck VIN: 2GTEK19ROW
Hey all my friends in iatn land. This is my truck. About 5 months ago we added a new business to our automotive shop. For communications we decided to go with Nextel. Everything was fine for about 4 months when I started not being able to get calls or direct c...
1997 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GR62C8V
the customer complaint is "dies while driving". I got the car with dtc p101 set and the ses lite on. after reaching operating temp and a short drive at 60 mph, you can let off the gas ( tps at 0%) and coast...the car will die at about 30 apparent reas... Trouble codes: P0101
1981 Pontiac Firebird 4.9L engine VIN: IG2AT87W4B
car will not run with all 8 spark plugs in and wires hooked up. runs if you pull the 4 plugs out of either side of engine and it will run on the 4 cylinders. replaced coil on distributor and did not make a difference.
1995 Pontiac Grand Prix GTP 3.4L brake pedal VIN: 1G2WJ12X3S
Comeback!This one was listed @ 2 weeks ago,i recieved messages about bleeding the ABS portion better after a repair,i did,and the car stops alot better,but it still has low pedal.It's not just low,but it goes to the floor and is pretty scary at times while dri...
1999 Pontiac Montana 3.4L ABS light VIN: 1GMDX03E9X
Hi everyone, this Montana has a abs\trac light on, will not show any current or history codes, will not clear codes or turn off lights, data shows normal except EBTCM batt volts are at 2.5, I can disconnect the module and reconnect, the volts start at 12 and r...
2001 Saturn L200 2.2L rear VIN: 1G8JU52F41
Squeaking/creaking noise in rear of vehicle, noise comes and goes, may be heard on smooth roads, also may be more noticable when stopping and starting to move. We suspect the outer lower (damping?) bushing. This is constructed with boots, we have tried to inje...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Limited 3.1L Accessories VIN: 2G4WY52M4V
We replaced the instrument cluster with a 'used' one and everything is OK.Thanks everyone for the ideas
2001 Buick LeSabre Limited 3.8L class II dat VIN: 1G4HR54K61
After reading the replies and using the new search feature for the forums-which does work really great like everyone has said-I tryed clearing all the codes from from all the modules,roadtested the car,rescanned-u1302-short/open in class 2 data line.OK so I cl...
1997 Cadillac DeVille 4.6L No Start, HARD START VIN: 1G6KD54Y5V
really dont have a fix. weather warmed up enough to stop the flooding. will have to wait untill the fall unless he sells car. thanks for all your help.
2001 Cadillac Eldorado ESC 4.6L speedometer, dash VIN: 1G6EL12Y31
finally the caddy is gone, the tech who replaced the blown fuse had put the new one in a blank spot leaving the blown fuse empty. Being that the back of the trunk isnt the most comfortable place to be checking fuses it was easilt overlooked. Thanks
2002 Cadillac Seville SLS 4.6L battery lamp on VIN: 1G6KS54Y32
thanks to the group for the replies, thanks to jervis in north carolina, i did have amps going to the battery but they were constant. no change reguardless of the load you applied. orange wire at regulator had constant battery voltage, return wire had consista...
1975 Chevrolet Caprice Classic 6.6L Misfire after rebuild VIN: 1N69U5J185
Hello everyone and thanks to everyone who took the time to respond. I got many emails about vacuum leaks etc and other passed horror experiences that techs have had. This is an example of one that I should have just walked away from for a couple hour and then ...
1990 Chevrolet Camaro Iroc-Z 5.0L MIL Lamp on VIN: 1G1FP33F6L
problem fixed, thanks for your suggestions, i did more research on ecm all after market part numbers for a 90 camaro ecm is 7730, oem number is [...] revised prom still does not work with either ecm , so i installed old prom on new ecm, everything works gre...
1994 Chevrolet Camaro 3.4L High Idle VIN: 2G1FP22S4R
Thanks for all the replies guys. I did have a major vacuum leak into crankcase. Sure enough slipped intake gasket. I got her going again today. Idles great and no CK engine light. Trouble codes: 35 (iac idle speed error).
1995 Chevrolet C3500 7.4L fuel pump VIN: 1GTGC33NOS
Hi all, I had 22 replies and all were very good suggestions. The closest were the ones that suggested Oil pressure bleed off taking to long (which was my first thought) and they suggested flushing the block. Some others suggested a sticky relay or Oil pressure...
1995 Chevrolet K2500 5.7L No Start, Stall VIN: 1GBGK24KXS
Thanks for the responses. Well, the lesson was learned, don't assume. When the truck first came in we checked the F\P amps, waveform, press and volume. All checked good and we unhooked the f\p gauge and replaced the fuel filter and still monitored F\P voltage ...
1996 Chevrolet S10 2.2L engine VIN: 1CEC3234SW
thanks to all for your input on this 2.2 gm.i am a ase master tech with 27 years of experience.this is the first 2.2 i have seen with this niose.we as auto techs have never seen it all.anyway i went straight to the timing chain as most suggested.everything was...
2000 Chevrolet Impala 3.4L Cooling Systems VIN: 2G1WF55E8Y
Thanks to all who replied, The problem with this car was the intake manifold gasket. As I was replacing the gasket I could see where it cracked and was leaking oil into the coolant passage, like some of you had said. Thanks alot for all the help!!!
2002 Oldsmobile Bravada 4.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GHDT13S42
Thank you all for the help on this one. We were able to deliver this rig today, confident of the fix. We had to replace the throttle body then continue diagnosis. (I will recommend that you dont apply vacuum to the map sensor then release. The cable inside the... Trouble codes: P0171, P0501.
1996 Pontiac Sunfire GT 2.4L Excessive Emissions, Poor Fuel Economy VIN: 1G2JD12T4T
Unfortunately, this vehicle continues unsolved. Roger from Alberta suggested that maybe this PCM was continuing to purge because the PCM kept on seeing vapors (via the O2 sensor) coming from the canister. I liked your thinking Roger. So I let the purge hose su...
2000 Pontiac Grand Am SE 2.4L steering VIN: 1G2NF52T0Y
thanks to the guys for there replies. We did replace both power steering hoses, mainly due to leak. We flushed system, added conditioner. Car still has a growl but only when turn to lock position, Before it was doing it at easier turns. Customer is going to dr...
2000 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: 1GZHZ5419Y
Thanks to all the reply's I can't remember who told me about the plug wire that could still be bad even after checking out.I put a new wire on that cylinder and the missfires were gone.Unfortunatly it made it 150 miles and my kid called and said it was acting ... Trouble codes: P0301.
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