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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 23, 2007
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Open Help Requests for GM
Help Request Answers
1953 Cadillac allard 331CID starter VIN: K33282XXXX
Howdy every one need a little help here. The car is a Allard K3 with a Cadi drivetrain. The starter is not engaging smoothly, If this was a GM pad style I'd start with 3 shims at least. But it mounts like a Ford to the bellhousing. I think the wrong ring gear ...
1992 Cadillac Eldorado 4.9L MIL Lamp on VIN: 1G6EL13B4N
Hello all! This caddy is losing communication on UART serial line somewhere... problem is it comes and goes so intermitten is becoming difficult to pinpoint. Main concern is when problem occurs, Fuel information and heater controls all show dashes and are inop... Trouble codes: E052 (pcm memory reset), A11
1992 Chevrolet K1500 Suburban 5.7L Poor Idle Quality, Surge, Stall VIN: 1GNFK16K5N
This truck runs good until it warms up. When it idles it will start to surge and eventually stall. In park or drive doesn't matter. Doesn't matter if its in closed loop or open, or w/ the est connector unplugged. Have replacd dist. and iac. The fuel pressure s...
1994 Chevrolet S10 4.3L abs VIN: 1GCCS14ZXR
I had this truck come in for a low brake pedal. We found that the master cyl was bad & replaced it. The front pads & rear shoes all in good shape. The owner stated that when the bake pedal when down the red brake light & the amber anti-lock lihgt came on we sc...
1995 Chevrolet S10 4.3L Hesitation, Misfire VIN: 1GCC19W3SK
hello everyone. Vehicle originally came in on wrecker with a no start condition. Cfi unit was leaking under intake and was replaced. All was fine until 4 days later when vehicle came back with a hard miss under heavy acceleration. We scanned for codes and pull... Trouble codes: P0341
1995 Chevrolet S10 2.2L Instrument cluster VIN: 1GCCS1442S
Hello Guys and Gals. This one is weird. Couldnt find anything in Archives. This is an intermittent problem but after several tries and finally today riding with the customer I saw it. Going down the road, doesnt matter hot or cold, The speedometer drops to 0, ...
1996 Chevrolet Blazer 4.3L No Start, Stall VIN: 1GNCT18W7T
Vehicle towed in October 2006 no start. Fuel pump inop. Checked power and ground at pump and found both good. Replaced pump with aftermarket unit, Vehicle started, no problems, slam dunk done. Towed in about a month ago 6000 miles later with same symptoms. Di...
1997 Chevrolet Blazer 4.3L gears VIN: 1GNDT13W6V
Replaced engine due to knocking noise. 2 weeks later transmission went and was replaced. Customer complained of transmission slipping after 2 weeks - found transmission fluid leaking internaly into breather hoses. Replaced with another tranny. 2 days later cus...
2000 Chevrolet Blazer LS 4.3L compressor VIN: 1GNCS13W3Y
This is my main acct. they bought this truck at auction and climate control didnt work.I have removed all the messed up shade tree wiring. Now I have no power to cycling switch. With OTC on the BCM, It shows there is no command to activate ac when AC button is...
1996 GMC K3500 Sierra SL 7.4L pressure plate
this vehicle came in recently for a clutch replacement. as it turns out we put in the 2nd clutch, the first was installed at roughly 40,000 miles by another shop. we put in the 2nd at 96,000. the truck would not move at all when we got it and the disc was burn...
2000 GMC K3500 Sierra SLT 5.7L No Start, Cuts out VIN: 1GTHK34R7Y
This truck is getting the better of me so I am hoping someone has seen this before and can give me a direction to go in. It has been towed in twice for starting and then shutting right back off, both times there was a P1631 stored. Both times it would start an... Trouble codes: P1631 (Theft deterrent password incorrect)
1986 Oldsmobile 98 Regency Brougham 3.8L Mechanical VIN: 1G3CW69B2G
veh came in on tow truck no start installed battery started up runs really rough its running in limp mode tested cam / crank sensors and cleaned mass air flow need help no codes present
1998 Oldsmobile Bravada 4.3L blend door motor VIN: 1GHDT13W2W
Hi all this vehicle has problems. It has automatic climate control. the blend door motor wont go to cold. We have dont extensive tests. The current blend door motor goes to hot and just clicks back and forth alittle. We have gotten a new blend door motor from ...
1998 Oldsmobile Achieva S 3.1L compressor VIN: 1GN3457677
Car was bought from the auction. Came in with ac clutch falling off of it so customer decided on a reman compressor. AC has never worked that we know of. Now ac is still inop with correct charge. Discharge lines from compressor dont seem very hot. This system ...
2002 Oldsmobile Alero GL 3.4L Misfire VIN: 1G3NL52E22
help - this car was towed to my shop. try to start, water coming from between head and block - both heads. customer stated car overheated and someone repalced head gaskets. found head bolts loose - both heads. removed heads and had pressured tested and surface... Trouble codes: 300 (misfire detected)
1993 Pontiac Bonneville SE 3.8L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1G2HX53LXP
customer has had at another shop. they installed a new fuel filter, fuel pump, oxygen sensor. i smoked the intake system and am getting smoke out of crankcase through oil fill cap. i replaced the intake gaskets. they were distorted. i still have same problem. ... Trouble codes: 44 (lean oxygen sense)
1999 Pontiac Grand Am GT 3.4L No Start, Cuts out VIN: 1G2NW12E5X
this car will not start somtimes. i checked it out and somtimes you cant hear the fuel pump running and it will not start. when you hear it running it will run. customer says that it will take a long time to start and dies going down the road. but will start ... Trouble codes: 1626 (theft system but light is not on and still dies or no start)
2002 Saturn Vue 2.2L guagestuckon3/4 VIN: 5GZCZ23D82
when you unplug the senders guage will pegg full

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L Stall, Poor Fuel Economy VIN: 1G4HP52L22
after some driving he finally got it to act up for him and the data was very bad wrong he replaced the pcm and after a week of driving by customer no problems arised so he is saying it is fixed
1987 Cadillac Eldorado 4.1L Compressor VIN: 1G6EL1188H
I would like to thank all who sent replies. Clearing the codes did help the unit. After reconnecting the battery, the unit came on. I was able to add freon to the unit. At this point, the customer hasn't called to state it's not cooling. My pressures are corre...
1967 Chevrolet Corvette 624CID Headlight Motors VIN: A41E125E87
Ladies & Genelemen, While iAtn says I have gotten 6 replies, I only received 5. I would like to thank: Bob [...] My customer will get this car back in the shop and he will have all I ...
1996 Chevrolet Caprice Classic 4.3L Hesitation, Cuts out, MIL Lamp on VIN: 1G1B152W1T
sorry about the late responce they took to dealer and said they had wires to o2 switched but we didnot get a chance to see the car again. Trouble codes: P0304 (cylinder 4 missfire), P0300 (mutiple missfire).
1997 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS19X3W
alright guys. thank you all for your input and direction with this one. as it turned out it was something pretty easy that i just overlooked. the wiring harness going to the pass. side o2 sensor was sitting on the exhaust manifold down by the frame. this groun... Trouble codes: P0300, P0135, P0147, P0151.
1999 Chevrolet Corvette 5.7L drive belt VIN: 1G1YY32G0X
Just finished the repair on this difficult problem. I had many susgestion and replies for this problem, so I would like to explain the process and final repair of this problem. First I had to determine if the noise was be created by the upper or the lower part...
2000 Chevrolet Malibu 3.1L power steering VIN: 1G1ND52J2Y
Kind of a fix. Due to the low money problem, I sucked out the p/s resivour added some SEA Foam trans stuff, let her sit for 3 days. Started it yesterday, it turns a lot better. put in new p/s oil, Customer says its better than it ever was. I told her its not r...
2000 Chevrolet S10 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GCCT19W7Y
thanks for all the help. it is fixed. jim from texas i pulled the distributor the upper bushing was smoked and the rear hold down hole for the cap was broken off the distributor housing. installed a reman distributor new cap and rotor thought i had it, still s... Trouble codes: P0339 (crankshaft position sensor ckt).
2000 Chevrolet Express 3500 5.7L Misfire, Hard to start VIN: 1GBHG31R8Y
Well thanks to all that tried to help. I dont even know how to begin with this except that I stabbed the distributor wrong!!! But wait theres more the cam corelation was right on the money. I had this thing pointing at #8 instead of #1 and it ran!!! and the nu...
2003 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT19X03
The fix for this vehicle was a new ECM. The wacky test results that I got was NOT caused by my scan tool as feared. I went out and found two more vehicle to run the tests on and they acted correctly. Thanks to all that replied! Mark Trouble codes: P0446 (evap vent valve control circuit).
2004 Chevrolet Suburban 1500 LS 5.3L belts VIN: 3GNEC16Z64
I am posting as a fix but it is not,I'm sorry to say. everyone came up with excellent suggestions. But I had 15 different suggestions and a noise that only last 15 seconds on first start up. The customer is either coming back when more constant or they are try...
2001 GMC Sierra 3500 SL 6.6L Excessive Emissions VIN: 1GTJK39121
replaced all injectors, no more white smoke at idle
1993 Oldsmobile Silhouette 3.8L No Start VIN: 1GHDU06L2P
steve from ohio hit it on the head. icm was not making good contact with mounting plate. allthough that was one of the first things i cleaned. i never check with test light for ground. after further testing found icm not grounded.not sure why but module was no... Trouble codes: 66 (a/c pressure sensor prob.), 67 (cruise switch fault), 68 (cruise command prob), 69 (high pressure switch).
1998 Oldsmobile Aurora 4.0L climate control system VIN: 1G3GR62C7W
Ok everyone This one is fixed. Thanks to all who replied. The fix was the blower motor control module. There are 4 wires connected to the module. The confusing part was the purple wire. The wiring diagram shows this to have a fuse in line with it. I originally...
2001 Saturn L300 3.0L coolant VIN: 1G8JW52K01
thanks for the pointers, I found a way by using adapters for my fuel pressure rig to air pressure test the engine oil cooler, and did in fact locate a leak within the core itself, replacing the core with a new unit, albeit EXPENSIVE, did the trick.
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