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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 19, 2004
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Open Help Requests for GM
Help Request Answers
1996 Buick Roadmaster Collector's Edition 5.7L lean at idle VIN: 1G4BT52P7T
This is a well maintained unit It came in for CEL and I found PO174. Replace O2 sensor and the light has not reset but if you watch the fuel trim it is always adding fuel at idle, and especially bank 2. At cruise, the trim will fall to +- 2 % stft and bank 1 L... Trouble codes: P0174
1988 Chevrolet C1500 Cheyenne 5.7L Stall VIN: 1GCDC14K2J
vehicle brought in for intermittant stalling when turning at slow speeds or backing up. distributor was replaced at another repair shop. funny thing happens...sometimes idle will increase while in gear, if you go to neutral idle will be around 2000 rpms. somet...
1990 Chevrolet C-70 Kodiak 366CID Surge, Stall, Misfire VIN: 1GBLZH1P9L
When I try to reed codes I get no data. there is no power at ALDL. does anyone have a flow chart for this truck.
1994 Chevrolet Corvette 5.7L updated reflash VIN: 1G1YY22P0R
this vehicle is a lt4. customer just had cam replaced with oem lt4 hot cam, pcm replaced & reprogrammed by another shop. the original reflash was for a f body car which caused the speedometer & a/c not to work. customer sent ecm off & had it reprogrammed-pn. 1...
1995 Chevrolet S10 2.2L Excessive Emissions, No Start, Poor Idle Quality, Misfire VIN: 1GCCS1440S
Cust has brought truck in for no start, checked fuel pressure 0 Psi,Replace fuel pump assy with delco unit and new strainer and filter. Truck is hard to start and after hold pedal to the floor truck starts and runs pig rich. Have replaced plugs and wires(oem) ...
2001 Chevrolet Tahoe 5.3L long crank time VIN: 1GNEC13T41
We have a 2001 Chevy tahoe 5.3 . Intermitant long crank times. Starts and runs fine once going but cranks about 6 to 8 seconds before engine starts. No codes stored and fuel pressure checks out. Service air induction and replaced fuel filter recently. ? Has an...
2001 Chevrolet Tahoe 5.3L transfer case VIN: 1GNEK13T71
Gentlemen, I have a 01 Tahoe with the service 4wd light on. Code present is C0387. It appears to be stuck in 4-high. If you clear the code and only push 2-hi, code will not reset. As soon as you push any other position, code comes back instantly, and all ligh...
2003 Chevrolet cavalier 2.2L No Start, Cuts out, Stall VIN: 1G1JC52F53
Hello, This car will start then shut off, sometimes will start again then shut off, sometimes will act like it is out of time when you crank it. Then it start and run fine. Pulled spark plugs they were fouled cleaned plugs no improvement. swap ing. module and...
1998 GMC K2500 Sierra SL 5.7L spark knock VIN: 1GTGK24RXW
customer has had truck at another shop--everything they tested-tested good--so they started guessing. we got into this by saying we would look at it. fuel pressure is good, o2's switching normally-knock sensor retards timing, but when under a load( truck has a...
2001 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS14591
Vehicle came in with P0178 P0179. Ran trouble tree and came down to replacement of FCS sensor approx 600 coco's. The code P0178 resets hard after 15 secs which is consistant with diagnostic tree info (12.5 secs.) I Have ingition feed, 5 volt, and ground at all... Trouble codes: P0178 (FLEX FUEL SENSOR OUTPUT LOW Hard Fault), P0179
1996 Pontiac Grand Am SE 3.1L cluster VIN: 1G2NE52M7T
hello guys on this one the insrument cluster the idiot lights blink on and off while running in the bay and the mph & the rpm gauge will jump all of a sudden than than be fine for about min. than be fine. i pulled on and moved engine harness around . diconecte...
1997 Pontiac Grand Prix GTP 3.8L Starting VIN: 1G2WP5219V
Car came in complaining that the battery went bad in this car...At another shop they replaced the battery w/ a new "die-hard"...18mths later, it went dead again...he then had a new battery installed, this time it only took 4 months until trouble arose again. I...
1998 Pontiac Bonneville SE 3.8L egr passage VIN: IG2HX52KWH
hey everybody; i am a chrysler tech and my experience with gm is pre obd2 i got this 3800 series II that keeps melting the egr passage in the upper plenum. this is the third one sence the customer has owned it,he bought it at about 37,000 miles. the new p...
1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZG5284W
ports are clear, came on again about 5 months after last replacement. just trying to find out if this could be a ghost code for egr, we recently purchased tech 2 with software programming capabilities and see alot of reprogramming for the setting of false code... Trouble codes: P1404 (egr valve position error)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y8W
The used ignition module has the same cam sensor code and I dought that both modules would have the same ptoblem. The cam sensor signal to the ignition module is ok. Disconecting the cam sensor signal wire at the pcm did not show any signal. I posted thi... Trouble codes: P0340 (IC Module Cam Reference CKT No Frequency).
1990 Chevrolet Camaro Iroc-Z 5.7L Excessive Emissions VIN: 1G1FP2389L
sorry for not responding back i want to thank every body who help me we found the problem after replacing the injectors we still had hight hc reading so inspected the egr gas leaks timing ect sensor we notice that after the vehicle has been running for a while...
1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M7V
I checked the vapor canister and the plumbing. Everything checked out good. The only thing I could find that might be wrong was that the vapor canister solenoid was sticking at times. Replaced the soleniod. So far it hasn't acted up. Thanks to everybody that r... Trouble codes: P0446 (Evap. System Canister Vent Blocked).
1999 Chevrolet Tahoe LS 5.7L starts,dies in 2 sec VIN: 1GNEC13R7X
Thanks for the replies. Everybody informed me that there is no way to bypass the theftkey system on this vehicle. We decided to get a key, since the other one had been lost by customer and program it by the procedures listed on alldata.
2000 Chevrolet Cavalier LS 2.2L Hesitation, Stall, MIL Lamp on VIN: 1G1JF5244Y
Hello and thank you to all replies,sorry to take so long on closing.after testing all wiring with amps/volts applied, all circuits tested good.with fuel tank dropped, we finaly decided to install new ftp sensor.(should have done this days ago,per replies).pcm ... Trouble codes: P0122 (tps circuit low), P0452, P0530, P1275.
1986 GMC K1500 High Sierra 5.7L reverse VIN: 2GTEK14H0G
Sorry it took so long! but i've benn busy. Since i've been working on this trans since i bought the truck four years ago and the original owner had the same type of problems i've had and had it rebuilt numerous times! I like Daves advice on this thing as well ...
1994 Oldsmobile 98 Regency 3.8L Poor Idle Quality VIN: 1G3CX5K8S4
thank everone for replaying, i check out the idle control motor it seemed to have a bad spot in in. i replaced it and it seems to be working alright know. thank you aging.
1990 Pontiac Grand Am LE 2.3L waste spark? VIN: 1G2NE14DOL
Turns out a static charge built up in outer ring of crankshaft pulley was arcing to engine front cover. GM's TSB 92-6-45 shows updated pulley with grounded outer ring for '87 thru '92 Grand Am/Grand Prix. Brad Muggridge nailed this perfectly. Special thanks to...
1992 Pontiac Bonneville SE 3.8L gauges,displays VIN: 1G2HZ52L8N
The ground connection was tight and not corroded but it had been tightened against the sound deadening material creating a intermittent ground.Thank you to the one reply I recieved, it was pricless.
1995 Pontiac Bonneville SE 3.8L Cuts out, Stall VIN: 1G2HX53L7N
Hey, Thanks for all the replies. NO one responded to the images what could have caused the signal I have gotten. The fix was another crank sensor . Put it in Saturday let run four hours no problem. Customer took car everything still OK as of today. Thanks ...
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