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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 11, 2005
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L valves VIN: 1G4AG55M1T
Hello all! Hey I just and mean just got through putting intake gaskets on this 3.1 and when I went to crank it it sounds like no compression. I used gaskets from fel-pro and it felt like there was some pressure on the pushtubes but not much. Does anyone think ...
2000 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K3Y
car came in with engine missing on cylinder #1 ignition spark & fuel pressure tested ok & no vacuum leaks found, we replaced #1 injector & fixed problem. about 3 weeks later car was back with miss again this time on cylinder #5, we did a fuel injection cleanin... Trouble codes: P0300
1998 Cadillac DeVille 4.6L oil light blinks VIN: 1G6KDS4Y8W
hope someone has run into this problem.car came in for oil leaks replaced op switch,oil level sensor and crank sensor gasket,cleaned up bottom of car and drove home to ck for oil leaks had dye in engine after about 30 miles oil light blinked on at stop drove c...
1990 Chevrolet Lumina APV 3.1L No Start VIN: 75YHTFDFH5
Gm tech i need you're help please!!! the truck was towed to the shop because engin stop when running ... check and timing chain was broken... check valve...found bent valve on cyl #4 ans i replace engin.after installation try to start engin ...bo start check f...
1990 Chevrolet R1500 Suburban Silverado 5.7L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNER16K4L
Hello All, This one has us stumped. We got the truck for an engine job. Swapped engine with rebuilt. Very good rebuilder! Got the thing on the road and things started going south. Customer had some hokie aftermarket ign. system on the old engine that we remove... Trouble codes: 42 (est problem)
1992 Chevrolet G20 Chevy Van 5.7L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GEBG25K2M
Customer is experiencing rough idle at times - emission readings at the test station are 300-675 HC at idle - however it has been as low as 117 at the shop and passing fine - this situation appears intermiiten - all other readings ok - has a new 02 sensor and ...
1994 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P4R
Car came in three days ago with a no start. We found the rotor button destroyed, replaced cap and rotor with new delco that lasted about 150 miles. Car is back today with same problem. Anyone seen this before? It looks as if the rotor button rubs the cap until... Trouble codes: 41 (42 -), 42
1995 Chevrolet Monte Carlo Z34 3.4L Vehicle Antitheft System VIN: 2G1WX12XOS
Has Had A new Key assembly At Used Car Dealer when customer Bought vehicle and we put in A new VAT Module worked for about 2 weeks and now It Is a no start,No power To start wire on Starter Selonoid, Started once with key in shop but not again,according to All...
1997 Chevrolet Venture LS 3.4L coolant temp sensor VIN: 1GNDX03E4V
burped vehicle for hours.van may be fine for 2-3 days.then van will appear to be overheating.coolant never boiled over.afer burping system again,gauge would not peg out until capped off and reopened.coolant never boiled over.can somebody please help. I am losi...
1998 Chevrolet Blazer 4.3L security light VIN: 1GNDT13W5W
Help,this blazer came in start and die with security light flashing.we replaced lock and did relearn all is well truck leaves.Now,truck comes back with security light on solid,no flash,cant do re-learn.Has incorrect password code stored.we normally use the sna...
1998 Chevrolet C1500 Cheyenne 5.7L engine cuts off with brakes applied or right turn VIN: 2GCEC19R0W
Need help from any GM guys this 98 silverado has a weiered problem, here goes, when you tap on the brakes the vehicle will turn off and also when you put the right turn signal the engine turn off also. it's my uncle's truck and the spark does not quiet when it...
2001 Chevrolet Camaro 5.7L 6 speed change VIN: 2C2FGTSGA1
First of all sorry about the wrong vin # forgot it at work and I'm writing this from home. Okay that said customer came in and asked if we could change over his automatic trans to the 6 speed. it sounds like it can be done from what my trns shop has told be bu...
2001 Chevrolet Impala 3.4L Starting VIN: 2G1WF55E21
2 codes,U1064, P1626. After disconnecting the ground at the battery, car starts fine about a dozen times before it sets these 2 codes, then it won't restart. Starter relay looses its ground signal from the BCM, also at this time to power door locks don't work....
2002 Chevrolet Cavalier LS Sport 2.2L MIL Lamp on VIN: 1G1JH52F42
Need some help with this one boys. The customer complaint is that the check engine light comes on, after the vehicle sits for awhile, customer starts vehicle and drives for about 2 minutes and the light comes on. Light has not come on for us at all. Have run d... Trouble codes: P0135 (Oxygen sensor heater circuit bank 1 sensor 1)
2002 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDS13S22
this blazer is at a friends shop.the customers complaint is at random times when you come to stop sign THE blazer stalls but start right back . friend at shop unable to recreate this syptom . he has scanNED computer for codes , none are present,has checked fue...
1998 GMC C3500 Sierra SL 7.4L Turn Signals VIN: 1GDKC34J9W
Turn signals work fine untill you press the brake pedal and a buzzing noise is heard from the combination flasher and the TS will stay illuminated/flicker. I replaced the combination flasher with a new GM part and I still have the same problem. Anyone run into...
1995 Oldsmobile Aurora 4.0L Instrument panel lights VIN: 1G3GR62C4S
I put a headlight in for my nieghbor a few weeks ago and all of sudden he says the dash board (instruments only) lights don't work. It gets stranger, when you turn the lights on the information panel goes dark. I am reluctant to start probing wires as to the t...
1993 Pontiac Trans Sport 3.8L No Start VIN: 1GMDU06LXP
This van came in on a hook. Has no spark. Had injector drive. Van has an alarm/security system which we removed. Ran all test (all Data/Mitchell) showed ignition module bad Replaced module. Still won't run Tested ignition a second and third time. Everythi... Trouble codes: 17 (crank rpm shorted), 18 (crank signal open/no signal), 21 (tps ckt high), 37 (maf sensor or circuit too low), 42 (est problem open/clsd loop-open exhaust 02-rich)
1995 Pontiac Bonneville SE 3.8L battery VIN: 1G2HX52K7S
found battery going dead over weekend. found electrical draw present. began removing fuses and relays. disconnected body control module, ecm, alternator, trunk latch and trunk light, etc. cannot think of anything else to disconnect yet draw is still present. f...
1997 Pontiac Sunfire SE 2.2L poor starting VIN: 1G2JB1248V
must crank engine for long periods before it starts. usually after shut off for 1 hour or longer or over night. seems to struggle to get running smoothley when it does start. almost like it is somewhat loaded up. appears to start easier if holding accelerator ...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Roadmaster 5.7L No ignition fire VIN: 1G4BN5370N
This one I will never forget! Thanks for all the response, but this was a strange one. After retesting everything many times, and check everything that could be checked, went all the way back and put a scope on the wiring and started at the battery and traced ...
2000 Buick LeSabre Limited 3.8L Mechanical VIN: 1G4HR54K5Y
Well I would like to start by thanking everyone for their input. Just a quick recap.. Customers complaint was that brake pedal would fade on initial brake apply after changing directions but only the first time, everytime. also a side note that the tire monito...
1995 Chevrolet S10 2.2L Excessive Emissions VIN: 1GCCS144S8
Thanks for the help sent. the diagnostics on this s10 is pending. I have to reevaluate the egr system again. Every one seems to point to the egr system.Will repost if the fix arrises.
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G1JC5242V
Thanks for all the replies,especially Jimmy from North Carolina,Joe from Texas and James from New York.The fix was to replace the IAC valve.The PCM was commanding the IAC closed but the valve was actually not closing.I did not realize that the PCM would shut o... Trouble codes: P0507.
2000 Chevrolet Malibu 3.1L Accessories VIN: 1G1ND52J8Y
thank you to all who replied I replaced the ignition switch as many of you suggested and that seems to have taken care of the problems thanks again
1990 Pontiac Grand Prix LE 3.1L Running Rich VIN: 1G2WJ54T6L
Most people suggested the FPR,which was O.K. Turned out to be a really,really badly leaking injector. After pulling fuel rail,turned key on and one injector was pissing like an old racehorse. Thanks for all the help.
1999 Pontiac Grand Prix SE 3.1L head lamps, ac blower, cooling fan VIN: 162WJ52M2X
I would like to thank everyone who responded. It was a great help. Our problem turned out to be the ignition switch. My tech checked the voltage at the blower fuse and had only 4 volts at all speeds except high. He changed the ignition switch and everything wo...
2002 Pontiac Aztek 3.4L Radio VIN: 3G7DB03E32
Thanks for everyone's repley. everyone was right we got a tech2 and set the vin from the bcm to the pcm and radio and airbag light was fixed. drove around in circles and compass was recalibrated. thanks again
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