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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 5, 2007
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Open Help Requests for GM
Help Request Answers
1987 Buick Century Custom 2.5L no start VIN: 1G4AH5155H
This car will not start when it is cold if the temp warms up to around 45 it will start and the car will run fine but when its cold outside it just turn over and no start .
1989 Buick Reatta 3.8L Instrument panel VIN: 1G4EC11CXK
Vehicle came in with no digital dash. All warning lights working correctly. Do not remember if Check Engine light worked. Tested power to digital dash, found power correct in all power supply postitions. Tested instrument cluster grounds, All voltage drops les...
1997 Buick Skylark Custom 3.1L MIL Lamp on VIN: 1G4NJ52M4V
we have been fighting this code for about a month - we installed a carquest oxygen sensor was fine for about three days came back, installed a delco sensor and good for about a week , back with same code.installed a dealer sensor , back after three days. repla... Trouble codes: P0135 (bank 1 sensor 1 heater circuit)
1989 Chevrolet Corvette 5.7L cylinder head VIN: 1G1YY2181K
I attempted to get original dimensions of this cylinder head from edelbrock but not available or so tech said ,so that I could check if either the manifold and/or the cylinder head(s) have been machined too far causing some kind of mismatch??? I did an intake ...
1991 Chevrolet S10 Blazer 4.3L No Start VIN: 1GNCS1324M
This is a no start on S10 4.3. I don't have books back this far. Need help with wiring. There is no codes. Scanner won't read rps while cranking. There is power to the coil. Not sure what to look for on the four wire harness to the dist. What else should we be...
1992 Chevrolet K3500 Cheyenne 6.5L No Start, Poor Idle Quality VIN: 2GCHK39J9N
Hi all, we are looking for information on this one from all the gm diesel experts. We have a 6.5l diesel that starts extremely hard (long long crank times) when cold. We replaced the heads with reman heads and according to the customer this is when his startin...
1996 Chevrolet Lumina APV 3.4L Cuts out VIN: 1GNDU06E3T
I have this van that cuts out now and then.When I was driving it and it was acting up I saw the CMP sensor signal go to no signal.Upon inspection I found wires frayed at the block,also sensor housing was cracked.Replaced and it still does it.This van only does...
1997 Chevrolet Blazer 4.3L engine VIN: 1GNDT13WOV
I have a bad engine in this Blazer. My salvage yard has an engine out of a '96 Sonoma with VIN code "X". There is a notation that the Sonoma has a lower performance cam. Will I run into any problems using this engine?
1997 Chevrolet S10 2.2L Cuts out, Stall, MIL Lamp on, GAUGES VIN: 1GCCS1445V
crank sensor has been repalced by dealer, we have installed a known good ignition module. code p0335 comes back every time it dies. the problem is very intermittant. test drove home for a week 17 miles in each direction before it acted up once. the first time ... Trouble codes: P0335 (crank sensor fault)
1999 Chevrolet Astro 4.3L heat VIN: 1GNEL19W8X
customer complaint,no heat radator,heater core & water pump have been replaced.
2001 Chevrolet Tahoe 5.3L Power Steering VIN: 1GNEK13T91
Customer stopped a Target store, shopped for about an hour. Started the vehicle, and there was no power steering at all. They left the vehicle in the parking lot overnight and called us for help. We went to the vehicle, started the engine, and there was still ...
2003 Chevrolet Venture LS 3.4L Front wiper system VIN: 1GNDU03E03
Thanks to all who took time to look at this post, I have an 03 Chevy Venture that parks the front windshield wipers in the up position every time. All the different speeds work properly. I've checked this one out as much as I can see and I'm thinking that the ...
2004 Chevrolet Blazer LS 4.3L O2 sensors, charge light VIN: 1GNDT13X34
Salvage lot installed 2003 underhood wiring based on dealer telling them it was the same. Now there are error codes for all oxygen sensor heater circuits and the charge light is on. If someone has wiring diagrams for both years, that they could fax me, I would...
2003 Hummer H2 6.0L Misfire, MIL Lamp on VIN: 5GRGN23U24
This Hummer shows code P0300 and is accompanied by a slight misfire at idle. Misfire is constant and, according to MODIS scanner, misfire happens mostly on cylinder #4. We tested compression. All cyls. read roughly 150 psi. We did an injector balance test and ... Trouble codes: P0300 (Multiple misfire)
2001 Oldsmobile Silhouette Premiere 3.4L Starting VIN: 1GHDX23E01
I have a no start. The starter is good.What I know is that turning the key on, everything works except on the insturment cluster I have on mileage, PRND321, or info. The check engine light and seat belt light or on. The turn signals and bright light work. Also...
1976 Pontiac Firebird 5.7L Hesitation VIN: 2T87M6N601
Hello group, this old firebirds got me feeling like a dummy. It has classic accelerator pump hesitation,but the pump spray looks good and i have been through the carb,put a kit and float in it, Egr system inop so its not a factor, fuel pressure and volume chec...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L Stall, MIL Lamp on
hello , thank you all for the great ideas, many people advised on checking the ckp sensor which i could not find a problem with. On the second time in the car seems to have vacuum leak by the fuel trim readings , it appears the upper intake may be warped & lea... Trouble codes: P0171.
2001 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP54K21
first i would like to thank the 38 techs that offered help to me but the problem turned out to be something no one would have guesed. the keyway on the crank got flatten by my trainee when he put the balancer on. the thought hit me after i went through all of ...
1979 Cadillac DeVille 7.0L Engine VIN: 6D47S99242
Well, it is still not back together yet, but I will get it done. After all this, I finally pulled a couple of the pistons. Looks like I am to blame all the way around. I had first started checking pistons on my better cylinders. I finally pulled out the bad 70...
1994 Cadillac DeVille 4.9L heater vents VIN: 1G6KD52B9R
customer declined repairs stated he cant see how a heater core would fix his condition. after all your helpfull replies i am shure it will,but not my car,again thanks for taking time out of your busy day to lend help.
1998 Cadillac DeVille 4.6L Poor Idle Quality, MIL Lamp on, Excessive High Idle VIN: 1G6KD54Y5W
First I want to thank IATN and members for being an outstanding source of info and help. I have fixed this vehicle. Don't know where my head was about the MAF sensor. Most everyone stated it had to be a vacuum leak. You were all correct. A few also mentioned t... Trouble codes: P0101 (freeze frame), P1571 (freeze frame), P0121 (freeze frame), P0101 (freeze frame).
1987 Chevrolet V10 Suburban Scottsdale 5.7L Endplay VIN: 1GNEV16K7H
Hello all, The 350 is built and gone. Thanks for the help. I recieved a LOT of replies for this post, but a couple of really good ones shed the most light on the subject. Let me start by saying that I build about 40 engines a year, but 95% of them are over...
1992 Chevrolet Lumina APV 3.1L No Start, Stall VIN: 1GNDUD6D6N
This vehicle disappeared off of our lot, I'm sure the owner took it, probably din't want to pay our diagnosis fee, so no fix to post. But most everyone told me that the injector is fired by the ECM when it gets it's signal from the ignition module, there was...
1996 Chevrolet C2500 Cheyenne 5.7L MIL Lamp on VIN: 2GCFC29MST
this one is fixed and gone.this was one of those that had made the rounds to other shops and owner has spent tons of money and it ends up on your door step. it wasnt running when it arrived and first inspecttion found loose,cut,spliced wires missing brkts and ... Trouble codes: P0102 (mass air low frenency), P0340 (cmp curcuit).
1997 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1440V
looks like customer abandoned this one. can't get a hold of them no how. number is disconnected just sent them a letter today. any way we did check with all replys still same condition if we do get to fix this one i will post it thanx to everyone who replied Trouble codes: P0108, P0122, P0123.
2001 Chevrolet Express 3500 8.1L Pedal VIN: 1GAHG39G31
Sorry to be replying after the repair was done more thhan a week ago, but the week after was busy. This week is more subdued. The bleeder had to be extracted, and, after bleeding the system, the pedal pumped up and the brakes worked normally. The tech had trie...
2001 GMC Sierra 1500 SL 4.8L Hard start
well guys after all the checking and scoping and probing I finally had a breakthrough... It dawned on me that if it's getting fuel while it sits maybe I should stick the five gas down the throttle plates and look for hydrocarbons...bingo numbers went high...on... Trouble codes: P0332 (Knock sensor performance).
2003 GMC Sierra 1500 5.3L volt meter VIN: 1GETK14T53
Thanks to all that responded. What we actually found was after removing the IPC, we found that the volt gauge needle was sticking or jumping in the sweep, hence not a smooth, fluid motion. Since the owner of the vehicle was leaving for home (South Dakota) the ...
2000 Oldsmobile Intrigue GX 3.5L starter and flexplat VIN: 1G3WH52H4Y
thanks for the help! the reman starter bolt holes were not drilled on center. even the old busted starter had the same thing. got a different starter from a diffrent supplier. problem cured. seems over time the nose cone gets week from the stress of the crooke...
2000 Saturn LS1 2.2L timing chain VIN: 1G8JU52F1Y
Sorry for the delay in closig this but I wanted to be sure it was good. I ended up putting in just the tensioner and the upper guide rail. The responses were split half and half about replacing the whole chain set. I choose to do only tensioner and the upper c...
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