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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 8, 2008
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1988 Buick LeSabre Limited 3.8L Misfire VIN: 1G4HR54C3J
This car comes in with an intermittent misfire w/cold. Tested fuel injector flow, ignition wire and plug and took compression, all in good condiotion. This condition does clear up after about 5min of driveing and then drives great. Its only on #5 cly. I have r...
1997 Buick LeSabre Custom 3.8L fuel gauge VIN: 1G4HP52K9V
this gauge always sits on 1/4 or full. we have no reference voltage at signal wire to sender. should have 5 volts. go to ecm to test for voltage and there is no wire at connector hole listed in alldata. tsb about updated diagrams and diagnostics appears to not...
1998 Buick Regal 25th Anniversary Edition 3.8L Cuts out, Misfire VIN: 2G4WF5218W
at cruise in od and go up slight incline and don't accel it will misfire if you then give it throttle and trans shift down and rpm goes up symptom goes away. i have no codes and o2 maf and tps sft look fine . at cruise or from a stand still you can floor it an...
2001 Buick Century Custom 3.1L ignition key VIN: 2G4WS52JX1
1990 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 1GCDK14K4L
I have this 90 chev truck that was towed in yesterday after dieing on the freeway. It had a bad fuel pump. Installed new pump & filter. Now have fuel to TBI but no start. There is power to the injectors and power to the PCM. Injector resistance is 1.6 ohms, Mi...
1993 Chevrolet K1500 Cheyenne 5.7L Temperature VIN: 1GTEK14K1P
After the water pump started leaking and was replaced by another shop, this truck started acting up. When you start it and drive it just a couple of miles, the temperature guage rapidly climbs to maximum, stays there for about 30 seconds, then quickly drops to...
1995 Chevrolet K2500 Cheyenne 7.4L abs module VIN: 1GCGK24NOS
the brake pedal is firm the first time you hit the pedal then the pedal fades away to nothing . tried to bleed the hyd system to no avail.any help with a different procedure would be greatly helpful. this is a kelsey hayes system. snapon scanner said to open i...
1996 Chevrolet Corvette 5.7L oddometer VIN: 1G1YY22P7T
Ok all you corvette techs I have this 1996 corvette battery went dead car sat for year or more replace battery no start dianosed & replace ccm learned key code car starts oddometer reads no vin I have a tech 2 and tis 2000 I can read ccm data & inputs but not ...
1997 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W0V
PLEASE READ BEFORE RESPONDING WITH SOMETHING I ALREADY CHECKED. THANKYOU IN ADVANCE! This van came to me from a machinest friend of mine. It was a no start about 2 months ago in his driveway. He called me asked for help thought it was an injector. Got it towed...
1999 Chevrolet Malibu LS 3.1L Hesitation, Surge, Misfire VIN: 1G1NE52J3X
This vehicle has a severe sag, chuggle, misfire on acceleration from a stop. This occurs only when the engine is cold and in open loop. After it goes into closed loop, it runs fine. I checked for vacuum leaks (none found), I also checked the air tube from the ... Trouble codes: P0300 (Misfire Detected)
2003 Chevrolet Trailblazer North Face 4.2L radio VIN: 1GNET16S03
We have a base radio system, no amp, no remote audio system that the tweeters only work when the vehicle is cold. After the vehicle sits in the sun and warms up to roughly 70 the radio works fine. Vehicle does not have steering wheel control for the radio and ...
2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCHC24U95
Vehicle came in for check engine light on and engine overheating. Found to have a bad fan clutch and evap vent valve--replaced and retested good. Now on to the Random missfire P0300. Miss fire detected on all cylinders, fuel trims look good, no vacuum leak fro... Trouble codes: P0300 (misfire detected), P0455 (evap syst. leak large), P0496 (evap syst. flow during non purge)
2001 GMC Savana 3500 5.7L Hesitation, Cuts out, Stall VIN: R811900469
as i explaned above this vehicle doesnt have any power. engine never revs up. you can stand on the throttle in park and it will never hit 5,000 rpm. had catalytic converters replaced with no change in performance. vehicle was overheated and blew engine and tra...
1995 Oldsmobile 98 Regency Elite 3.8L No Start, Stall VIN: 1G3CX52K4S
Hey everyone, iv got areal stumper, well at least for me. This out of the blue started dying around corners and then anytime you start it up. I dicovered if i crack the throttle even just a bit then it will run. I have to feather it to get it to idle. After a ...
1995 Pontiac Grand Prix SE 3.1L Stall VIN: 1G2WJ52M5S
This Grand Prix came in 3 days ago with a stalling problem, it would usually restart, sometimes right away, sometimes after a minute or two. All tests showed normal excepy 3x crank sensor would get poor and then go away just before stall. Replaced sensor and t...
2003 Pontiac Bonneville SE 3.8L Blower motor VIN: 1G2HX52K63
Here's a challenging one. It's a manual single zone system. When the defrost/floor button (upper left) is pushed and the blower speed (rheostat style) is set to 91% (Tech2 data) and the Temp door is commanded to 57%, the blower motor will randomly go off and b...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet Corvette 5.7L headlight doors VIN: 1G1YY2389L
Hi all. Sorry for the delay. Ordered parts to fix these motors for Ecklers. Took a few days for shipping and then had to reschedule customer. The repair was to replace the Delrin bushings in the motor gears. Part number 29304 cost around six bucks per kit, muc...
1995 Chevrolet K1500 Cheyenne 4.3L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GCEK14Z3S
Greetings my fellow technicians. While I did receive 31 replies as to what the problem could be such as pick up coil, egr issue, fuel pressure issue, wiring issue, voltage leak from alternator,restricted converter, TBI injectors...all very good answers, the f...
1996 Chevrolet C1500 5.7L pedal
Wow, thanks for all the responses. We tried a master and didnt help, powerbled w tech 1 didnt help. Customer is returning soon so we can spend some more time on this.
1998 Chevrolet Astro 4.3L Monitors VIN: 1GNDM19W7W
Gentlemen, thank you for your replies. I have taken every single one and checked, double checked, triple checked. No answers... yet... but I do not give up. Most of us would agree ECT issue of some sort. None found. Even changed thermostat, knowing would ...
1999 Chevrolet K1500 Suburban 5.7L Misfire VIN: 3GNFK16R7X
Thanks for all the replies. Sorry for not getting back sooner. The cust just brought truck back in today. A lot of replies were fo valve problems, which is more than likely the case. Jeff [...] was very helpful. Tried his solution & even though it freed up t... Trouble codes: P0304.
2001 Chevrolet Impala 3.4L Starting VIN: 2G1WF52E21
Thanks again guys. Once again IATN has pulled me through. Had to have this one programmed with the tech II. Problem solved...going fishing!!
2003 Chevrolet Trailblazer LS 4.2L transfercase VIN: 1GNDT13593
thanks for everones reply, we ended up replacing the front diff/took care of the problem/pinion bearings were out,and was jumping in and out of locking front diff//
2003 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E13
It's fixed thanks to those who took the time to respond (Dustin,Alex,Jonathan,James),all had good Info. but James was right with the crank wiring,I needed to have looked closer at it than I did,broken wires and 2 ready to break. After repairing,started up... Trouble codes: P0336 (Crank sensor A), P0620.
2002 Pontiac Grand Prix SE 3.8L ignition key VIN: 1G2WP12KO2
Thanks for the info. The car will return friday for the correct part. (Dealer sent one for a grand am). I really appreciate all the helpful guides. The responses really make a differnce.
2004 Saturn Ion-2 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G8AJ52F84
hey guys , sorry for the time frame, but i finally got it. thanks to all who replied and gave me great ideas. the biggest problem i had was that i overlooked a step in diagnostics. i performed a running compression test but not a base compression. when i final... Trouble codes: P0300.
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