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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 18, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick Century Special 3.3L Excessive Emissions VIN: 1G4AG55N4P
Trying to get this one through state inspection. On the dyno, as soon as throttle position reaches 4%, the O2 sensor drops to 0.01V and stays there. Artificial richening brings it to .85V instantly. If I let the TPS go back below 4%, the O2 starts switching ev... Trouble codes: 44 (System Lean History Code none current.)
1989 Chevrolet K2500 Cheyenne 5.7L rocker arms VIN: 2GCFK29J0K
The engine is a reman from D+J Machine and performance engines in Phoenix. It is a 300hp 350ci TBI engine I believe listed on e-bay. New valve springs(dual),clevite motorsports cam with .488 lift at the valve,1.6 stamped rockers, heads are 305ci small valve ca...
1991 Chevrolet Corsica LT 3.1L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 1G1LT54T6L
car came in with a hesistation/stalls at stops.Started to check the basics fuel pressure/spark/inj.pulse/inj.resistanc.So i replace 6 inj./vacuum lines under plenum.I notice pcm was replace before/also a wire repair going to computer(wire is for ign.control mo...
1997 Chevrolet C3500 Cheyenne 6.5L Unknown VIN: 1GCHC33F9V
this is my personal truck.this started all at once.went to move vehicle and batteries dead.charged batteries and checked alternator output.only 12.9 volts.changed alternator and tested 14.2.drove 2 days and let sit for two days and would not start.charged batt...
1999 Chevrolet Silverado 2500 6.0L cycling switch VIN: 1GCGK29U2X
customer has had cycling switch replaced numerous by the dealer. first switch was 3 days after he owned the truck. we put a switch in it, worked fine, cycled at (l)33 to (h) 45. the truck left with a good vent temp and a/c working perfectly. made it 2 days bef...
2000 Chevrolet Silverado 1500 5.3L ABS Module VIN: 16CEK19T4Y
This truck came in with the ABS light on. The ABS system was inoperative. My scan tool (Gynesis 2003) would not communicate with the EBCM. I replaced the module and pump assy. The ABS will now go into ABS stops on the lift as well as when driving and forcing a...
2000 Chevrolet S10 4.3L Hesitation, Hard Start VIN: 1GCCT19W5Y
This truck Has A lack of power on accel after startup This condition lasts for about 30 seconds and then straightens out. This condition is following a long crank time and is intermitent. Hot or cold start does not seem to matter. Codes are PO 171 PO 174 lean ...
2000 Chevrolet S10 4.3L raer axel VIN: 1M8RKJE788
hi all, i am looking at this for a friend. he put a rear in it from the wreck yard and never checked to see if the gear ratio was the same. the original was a 3:07 and the used is a 4:10. now of course the abs light is on all the time since the abs unit sees ...
2002 GMC Envoy SLE 4.2L No Start VIN: 1GKDS13222
Hi All I replaced the intake manifold on this vehicle. But since that it won't start. With KOEO check engine light stays on. Following the flow charts in reference to the codes retrieved it's leading me to TPS one & TWO. I am not to familiar with this vehicle.... Trouble codes: P1220 (Throttle Position Sensor 2-low voltage), P1120 (Throttle Position Sensor Circuit-Intermittant High Voltage)
1994 Oldsmobile Cutlass Supreme S 3.1L Poor Idle Quality, Surge, Stall VIN: 1G3WH55M7R
Hello My Fellow Techs. I have this 3.1 94 Olds Cutlass Sup that I just transplanted this engine in from another vehicle that is the same vehicle. When engine was in other vehicle it ran perfectly and the only reason we took it out and transplanted it was the f...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Regal 3.8L Service Engine Light VIN: 2G4WB11L6M
Thanks to all the Techs who replied i was really impressed with all the help. All repliese were that the magnet was bad and if i couldcheck for a sign wave at the cam sensor. I would have done this but the customer told me he was just going to live with the li...
1997 Cadillac DeVille 4.6L air distribution VIN: 1G6KD54YXV
Removed and voltage monitored the vacuum control soleniod pack for intermittant signals from the programmer to no avail. Customer advised that problem is becoming less and less frequent as time goes by. No codes at this time or before?? Yes the default mode is...
1987 Chevrolet G10 Chevy Van 5.0L blown fusible link VIN: 1GNEG25K4J
Well i'm not real sure if this is repaired. I thank everyone for their time & responces. This fuse link is at a juction block and not at the starter. And if other cicuits were causing more amps through then they should blow their own fuse. There wasn't anythin...
1995 Chevrolet Lumina 3.1L Stall VIN: 2G1WL52M85
Its fixed thanks to IATN you got me looking in the right direction it wasnt fuel related and to make along story short. Someone had replaced the EGR and lost the gasket off the bottom where the exhaust tube bolts up, why it caused these symptoms I dont know. T...
1998 Chevrolet Cavalier Z24 2.4L timing chain VIN: 4G1JF32T1W
replaced tensoner and guidr plates for chain and evertthing worked out perfect. from now on i am going to add this into water pump labor THANKS TO ALL TECHS THAT HELPED OUT!
1998 Chevrolet Express 1500 4.3L turn signal VIN: 1GCEG15W3W
Many replies for turn signal / combo switch. Some replies for wrong bulbs, etc. Replies about poor ground to turn signal sockets were correct. Driver front turn signal socket (only) had poor ground when flashing and was causing the fast flash. What I don't u...
1999 Chevrolet Silverado 2500 6.0L oil pressure VIN: 1GCGC29U5X
Thank you for the fast replies. We replaced the oil pump and the truck now has good oil pressure. I found out that one of the drivers ( fleet truck, may have a different driver every day) had complained that the oil pressure gauge showed low pressure at times.
1999 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13R9X
well i had alot of great sugestions and i looked into all of them. at my wits end i decided to pull the upper and lower intakes only to find the gaskets with no problems. Then I noticed #6 cylinder exhaust pushrod bent and laying in the oil valley. I would ima... Trouble codes: P0300.
1999 Chevrolet C2500 5.7L Mechanical VIN: 1GCGC33R6Y
well here is one for the books, if we had the proper information from the customer it would help, here's how it went. As you know it was here for no 4th when hot under full throttle, when what it really was , was no third gear when towing a loaded trailer afte...
2002 Chevrolet C3500HD 6.5L excessive smoking VIN: 3GBKC34F92
Engine did have excessive blow-by probably a broken ring. We opted to send the vechicle to a more experienced diesel shop. We haven't heard from them yet. Thanks for the replies!
2002 GMC Sonoma SL 2.2L Compressor fuse VIN: 1GTCS14532
Thanks for the replies. The 2 things I was wondering about are 1)with no diode would it blow the fuse. 2) Where was the diode located at for this vehicle. One tech thought that without the diode the fuse could blow. That tech is correct. After several weeks ...
1998 Oldsmobile Silhouette Premiere 3.4L ABS & Traction Control VIN: 1GHDX03E1X
Hi everybody. Thank you all for the help with this vehicle. Unfortunatly this customer did not allow us any more time to further diagnose the vehicle. By the time I was able to post a question and recieve replies the customer had lost faith with us. The dela...
1996 Pontiac Grand Am SE 2.4L Poor Idle Quality, Surge, Stall VIN: 1G2NE12T1T
Sorry to say haven't found what is wrong with it yet. Mom lives a good distance away and have limited time to work on it while over there. Checked oil pressure with snap on mechanical oil pressure gauge-reads normal when problem happens even drops pressure not...
1999 Pontiac Grand Am SE 2.4L No Start, Stall VIN: 1G2NE52TXX
I 1st would like thank all 9 guys who replied. The problem ended up being a bad connection at the LH junction block (driver's side fuse block). I tore the block apart and I was shocked to what I found. GM used 18 gauge solid copper wire to 'junction' pins to p... Trouble codes: U1000.
1997 Saturn SC2 1.9L Stall VIN: 1G8ZN1287X
Thanks all you guys for replies. I replaced the coils and ignition module. I have drove the car three different times today and with no problems. Trouble codes: P1599 (Stalls with ingition system enabled and loses crank position signal).
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