iATN Member GM Auto Repair Tech Exchange for March 4, 2008

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Park Avenue 3.8L Cuts out, Misfire Vehicle runs great at idle and light load, misses and backfires under load, no codes but 1995 has OBDII connector with OBDdumb software. Have checked and/or replaced EVERYTHING! Here's my list: fuel trim was showing lean at idle, found plenum gasket leaking, r...	View
	1991 Cadillac DeVille 4.9L hood cable Does anyone know how to open the hood when the hood cable is broken? We have the new cable but cannot open the hood short of drilling a big hole on it. The cable broke at the end by the latch, and I cannot reach up to the latch from underneath. Any tips or hin...	View
	1999 Cadillac Escalade 5.7L Shutter over 55 This vehicale has a shutter or thump over 45 mph when going into over drive or when slightly touching gas pedal or when letting up on pedal slightly. New IAC, TPS, Lower Intake Gasket had been installed by someone else. We felt it was a transmission problem at... Trouble codes: po405 (egr swsr ckt low v).	View
	1993 Chevrolet S10 Pickup 4.3L Excessive Emissions, Poor Idle Quality, Hesitation Vehicle came in with a complaint of intermitent loss off power. We found that it had original wires, cap and rotor and the distributor was coming apart. We replaced these parts and the vehicle still would die after 15-20 seconds of running. I checked for vacuu...	View
	1997 Chevrolet S10 Pickup 4.3L ig key cyl this truck came to my shop with the complaint the ig key will not come out of the cyl. upon further inspection the key cyl would not return to the off position. the key lock solenoid is not activating. i have tested the key lock solenoid ok the brake sw ok al...	View
	1999 Chevrolet Silverado 5.3L 4 wheel drive I've tested everything and there seems to be no ground to the system. Unfortunately I don't have access to any electrical diagrams. Has anyone had this problem. your help is greatly appreciated.	View
	1999 Chevrolet Silverado 6.0L Heater Car came in loses heat intermittently.You will just be driving along and the heat just fades away to nothing , not even lukewarm.Will not come back even when RPM's are raised. Will not happen all the time. Replaced thermostat ,same problem occurs.Outlet heate...	View
	2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, Stall This cavalier is quite the mistery. It runs very rich at all times. On initial startup cold it will push the O2 voltage above 900mv until it goes into closed loop at which time the fuel trim values go way negative and the O2 starts to respond. It has in the pa... Trouble codes: P0172 (Fuel system rich History Code).	View
	1995 GMC Suburban 6.5L MIL Lamp on, code 78 First of all I will tell you Im not a diesel guy, but my boss keeps bringing them in... This suburban came in with intermitant cel, not on but comes on and goes off. code 78 waste gate solinoid fault. If you check mitchal the test proceedure is so vague. I che... Trouble codes: 78 (wastegate solinoid fault).	View
	2001 GMC Yukon 6.0L oil pump this truck came in with the costumer thinking he needed an oil pump. upon first test drive, oil pressure registered fine,then would fall off to zero at idle at times,,, not all the time... hot or cold it didn't matter... when the pressure registers , it reads ...	View
	2003 GMC Envoy 4.2L alternator hello iatn world, thanks in advance! customer brought this in complaining of a louder than normal noise coming from the engine compartment. the only thing that sounded un-normal was the sound of the alternator working too hard. scaned for codes, found none. pc...	View
	2003 GMC Savana 4.8L Misfire hello gm techs we are stuck on this gmc van. when cold the van runs fine, once warmed up it will go into a misfire and show a lot of misfires on cyl 6. after about 3 minutes of running the misfire will go away for a short period the van will ren good and then ... Trouble codes: 300 (multiple misfire).	View
	1999 Oldsmobile Alero 2.4L wiring ? Hello, Heres a good one for you. Vehicle came in with no start condition, inst. cluster inop, and alt light came on. - inspect and test all circuits - found corrision in b.c.m. connector, no communitcation with b.c.m. installed new b.c.m. and had programmed. A...	View
	1994 Pontiac Grand Am 2.3L No Start, Cuts out, Stall when this car first came in it started fine it only stalled out when put in gear, installed new tcc solonoid. now it won't start at all. although it did start once it died and hasn't started since. I installed new crank sensor because I wasn't getting rpm sign...	View
	1997 Pontiac Sunrunner 1.6L master cylinder Hi Guys Guy that works with me brought this car in for a fuel leak and replaced the fuel tank and fuel lines. while he was there he replaced the 2 rear brake lines due to the condition of them ..After he replaced them wwe tried bleeding the brakes .We could on...	View
	1994 Saturn SL 1.9L Misfire, MIL Lamp on, #4 cyl in 4th gear Hi guys, really need HELP from Saturn techs on this one never seen anything like it. I checked TSBs and Iatn Archives couldn't find any answers. This car runs great at idle or in first or Second gear the problem seems to happen only in 3rd or 4th gear. I ran a... Trouble codes: p0300 (Multiple cyl misfire), p0304 (misfire cyl 4).	View
	1996 Saturn SL1 1.9L readiness indicators This one is for you Saturn guys. We have serviced this vehicle on and off for the last several years when the owner has been at home from school. The vehicle has had no special complaints and has been reliable. In January we replaced a failed EGR valve due to ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Chevrolet Blazer 4.3L Bearings I did not fix this vehicle but the replies helped with the customer. She elected not to fix it but instead live with the evident gear (not bearing) noise. I wish to thank all you who helped. Mike from OK offered advice to tighten backlash to abate the noise...	12
	1996 Chevrolet Blazer 4.3L oil system thanks for all or your reply's. i learned a lot from this vehicle. there is a total of two check valves and a pressure reliefe valve on this vehicle. the two check valves are behind the oil filter and reliefe valve is in oil pump. the ones in the oil filte...	35
	1997 Chevrolet Monte Carlo 3.4L Hesitation, Cuts out, Misfire good morning...sorry for the late post...just got back from hawaii vacation...last thing on my mind was this car...car is not fixed...to summarize...new upper and lower intake gaskets, engine timing checked and double checked...even cracked the cam sprokets an...	9
	1998 Chevrolet Malibu 3.1L lifters Thank all of you! I replaced the lifters and solved the noise. as many of you suggested there had been a small amount of coolant in the oil and apparently that is death to GM lifters. Thanks again your all Great! Shawn	44
	2002 Oldsmobile Alero 3.4L tcc I thank all 4 members for your replies. The items mentioned were checked and I recieved coaching by the Trans Clinic here in town. Mark who is now retired has decades of trans experience and has seen this problem on different GM platforms. He explained it as ...	5
	1997 Pontiac Grand Am 2.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy Thanks to all that replied but what had happened was timing chain had jumed a tooth hence the running bad problem hope this may help someone in the future again thanks to all Trouble codes: p0134 (O2 not switching).	7
	1997 Pontiac Grand Prix 3.8L No Start, Poor Idle Quality Sorry about taking so long to close this post out. I was waiting to here from the customer. He had the car for two weeks and said that it is working fine. Michael said to replace the crank sensor, he was right. Joe said to tap on it and watch the signal to...	9
	2001 Pontiac Grand Am 2.4L Alternator I won't bother going into a summary of the replies I recieved only because I must hang my head in shame, and in all humility provide an honest, accurate post. I neglected to state in my original post that I was working with a known good battery, as many asked...	12
	2002 Pontiac Bonneville 3.8L engine Thank you one and all (all 16) for your prompt and thorough replies. As many of you suggested, I did not get to measure oil pressure because customer did not want to leave vehicle. Today, he came back and gave me the chance to measure oil pressure at the senso...	16

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