GM Automotive Technicians Technical Discussion and Fixes for Feb 2, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B8P I have a cadillac that keeps blowing up mufflers. I have an idea why but need some help on diagnose. It will not go into closed loop and runs rich. It has new cap, rotor, wires, plugs ( all were dry), egr (POS flow)and O2 sensor. The ECT is reading correctly...	View
	1987 Chevrolet V10 Suburban Scottsdale 5.7L Endplay VIN: 1GNEV16K7H Hello all, Rebuilding a 350 from pieces. I have uncontrolled camshaft walk. There is NOTHING controlling camshaft thrust, I have 159 thousandths of end play, and the only thing that stops it there is the damn timing chain, it would walk right out through the ...	View
	1996 Chevrolet Lumina 3.1L raw fuel smell VIN: 2G1W15ZM8T This should have been an easy fix. Customer concern was the smell of raw fuel intermittently after driving, and sometimes while driving , outside as well as inside the vehicle with no apparent leaks or puddles.We have repeatedly inspected the tank and lines, p...	View
	1999 Chevrolet Astro 4.3L heat VIN: 1GNEL19W8X customer complaint,no heat radator,heater core & water pump have been replaced.	View
	1999 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC5246X After installation customer came back 3 days later saying still having problem.When tryed to start car it start and stall anti theft system flashing.Scanned computer system had p1629 and in ipc it had b1011 current and b1024 and b1028 in history which i cant f... Trouble codes: 1629 (anti theft system hard fault), U1016, B1011	View
	2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W61 Customer brought the car in and MIL lamp is on. Code P0351 is present in the computer. Erase code and code will reappear after restart or within 10 seconds of startup. If codes are cleared during KOER the code will reappear after 10-15 seconds of operation. I... Trouble codes: P0351	View
	2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Cuts out, Misfire VIN: 1GNDT13542 The vehicle cam back 3wks later, with the type a miss. But has been running right prior to this. So I pulled the codes PO 172 which is a fuel to rick bank 1 code. PO 303 clyinder 3 misfire detected and a PO 340 code which is a camshaft positioning sensor probl... Trouble codes: P0172, P0303, P0340	View
	2003 Chevrolet Suburban 1500 LS 5.3L instrument cluster Vehicle came in with high readings on the speed-o, 70 mph, and volt meter, 18-19 volts, with engine idling and in netural, and with key off. For no other idea where to begin with this, I checked alternator output, 14.2, checked for any codes, found none. I hav...	View
	2003 GMC Envoy XL SLE 4.2L noise VIN: 1GKET16S73 this vehicle has a tapping noise behind the radio area sounds like either stripped blend door or a bad acuator I dismantled 80% of the dash but cant see anything didnt want to go farther without some help dealer stated fuel peddle sensor caused this noise but ...	View
	2006 Hummer H3 3.5L No Start, Stall VIN: 5GTDN13696 Hummer is a independent imported car in Brazil. There is no dealers or warranty out here. After some weeks of using the brand new Hummer it started the following symptom: -After some time of ignition on or engine running, check engine mil will turn "on" and ... Trouble codes: P0601 (Control Module Read Only Memory)	View
	2000 Oldsmobile Intrigue GX 3.5L starter and flexplat VIN: 1G3WH52H4Y need some help here. vehicle was brought to me with a busted nose cone on the starter. drop the starter down found a few busted teeth on the flex plate. i now have the trans removed and try to figure out what happend. i installed new starter and when i tighten...	View
	2000 Pontiac Bonneville SE 3.8L door locks,power windows,power mirrors VIN: 1G2HX54K2Y Power windows,locks,door mirrors are inop. I beleive problem is related to body control module. I have replaced body control module with one from salvage yard(same part #)Will this work,or do I need to buy new one from gm and have them flash it? Can they refla...	View
	2002 Pontiac Grand Am SE1 2.2L No Start, Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G2NF52F22 First had vehicle in on 11/22/06 for s.e.s. light, engine has no power, and runs very roughly. We found that cyl's #2 and #3 were dead (no spark). Diagnosed and replaced faulty ignition module and engine ran great. Vehicle returned for the exact same concern o... Trouble codes: P0300, P0141	View
	2002 Pontiac Grand Am SE1 2.2L Excessive Emissions, Poor Idle Quality, Surge VIN: 1G2NF52F52 OK I need help on this one. This car came in on the hook and customer said"car ran fine to the mall and when they came out it would not start" Upon initial diagnosis the car had no compression,ie. timing chain jumped and bent every valve. This car had obviosly...	View
	2003 Pontiac Vibe 1.8L Unknown VIN: 5Y25L62883 hey gm techs i am stumped on this. the car came in orginaly for a vibration in the front. we then replaced both front wheel bearings with factory bearings. that fixed the noise in the front end. the car then returned for a vibration in the rear. the cust. said...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1963 Buick Riviera 400CID Engine Thanks for all the helpfull information you all gave to us. We have not yet completed the repair, but we were able to verify the problem and can take a course of action now. With all your help we were able to determine that crankshaft and or torque converter i...	23
	2004 Buick Park Avenue 3.8L rear suspension VIN: 1G4CW54K64 I replaced the air shocks with OE GM air shocks. The customer has driven for the last two weeks and called today to inform us that the problem has been cured. Thanks for the help	15
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNCT18W6S Sorry for the long delay in posting the fix. I got several replys that agreed it was a computer problem. I also got several replys to check for fuel leaking from the lines under the plenum or from the injector but as I said in the original post the fuel pressu...	17
	1995 Chevrolet Corvette ZR-1 5.7L cooling system VIN: 1G1YZ22J7S First off I want to thank all of those who responded to my request. I cleaned the radiator and condenser, not much but some debris was found. The general consensus from most of those who responded was that the problem I described was pretty much normal for the...	20
	2000 Chevrolet Silverado 1500 5.3L bell housing VIN: 1GCEC19T8X Pulled starter to check flywheel bolts and noticed starter drive fell down in nose cone, went ahead and checked bolts OK, re installed starter, started engine, loosened starter and noise went away, could watch starter drive jumping around and hitting flywheel,...	12
	2003 Chevrolet Suburban K2500 6.0L underhood wiring Hi ,thanks for the replies. the vehicle hasn't failed since the harness was patched up again.the new harness is here and the vehicle is coming in next week to get it replaced . still no real reason as to why it failed , possibly just a bad batch of wire.all su...	4
	1995 Geo Prizm LSi 1.8L Cuts out, Severe Jerk on Accel VIN: 1Y1SK5287S scoped primary & secondary ignition systems, all data looks normal. could not find faults in any electrical circuits that I could think of. all replys were close to problem. recommended customer to take vehicle to dealer. again thanks to all who replied. Trouble codes: 31 (map).	8
	1999 GMC Sonoma SLE 4.3L Steering VIN: 1GTDT19X4X Well it turns out Brian from Fl.had it. When changing the ps pump I had to transfer the psi reg. Well it was bad. Thanks all for the help.	12
	2001 GMC Sierra 2500 HD SL 6.0L wipers VIN: 1GTHC29U11 Thanks everyone for your responses, I went to www.acdelcotds.com and paid 20 dollars for a 3 day pass and was very dissapointed. The diagnostic chart was designed for the owners manual and not the tecnician in the field, The wiring schematics were such bad qua...	5
	1968 Oldsmobile cutlass s 5.7L fuel leaking VIN: 3367781131 thanks for all the replies,i took most of your advise & ran a fuel line from the one fitting to the other & ran the hose up against the floor higher than the tank its self.the car wont be finished till spring so ill have to wait to see if this works out ok.i s...	12
	1990 Pontiac Grand Prix SE 3.1L ecm VIN: 1G2WJ11T7L Thank you all who replied. This car now runs like a top and the customer is very happy. This car had 2 issues. The communication issue was solved by replacing the ECM. But, no fault codes were set after ECM replacment. After changing the fuel filter and confir...	13
	2000 Pontiac Grand Am SE 2.4L brake lights VIN: 1G2NF52T6Y well guys there were a lots of good tips but the old search and find is what I had to do. found the wiring loom at the rear lights (on the driver's side) just above the frame had corroded causing bare wires to touch and short out. the wiring had melted togethe...	11

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