GM Automotive Technicians Technical Discussion and Fixes for Apr 2, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick LeSabre Custom 3.8L convertor VIN: 1G4HP52K2V This car came in with a cheak engine light, the code was p1870 Trans component slipping. We test drove with the scan tool hooked up and found the tcc slippage was to high it was between 300 rpm and 900 rpm while the tcc was engaged in drive. We removed the pan...	View
	1997 Cadillac DeVille d'Elegance 4.6L abs VIN: 1G6KE54Y3V We have a 97 Deville with the ABS & Traction lights on. Not equiped with stability control. Code C1234 (L/R WSS circuit open or shorted). It comes on at random -- sometimes within 20 yds and sometimes 12 miles. Customer was referred by another shop. He saids t...	View
	1993 Chevrolet C1500 Cheyenne 5.7L rotors VIN: 1GCDC14K4P This problem existed before the brakes were done the truck drives excellent until brakes are applied it then pulls to the left and then right all the time and worsens the harder the brakes are applied	View
	1998 Chevrolet K1500 Cheyenne 5.0L valve VIN: 1GCEK14M0W Truck came in with leaking lower intake (big surprise) The motor was gunked up really bad so i pulled one push rod to make sure it was clear all the way thru. Well this is where i did the dumbest thing ever. I didnt realize it at first but the valves are adjus...	View
	2000 Chevrolet C3500 5.7L Hesitation, Misfire VIN: 1GBHC33R3Y This truck is missing constantly under a load and heavy accel. The Tech 2 reads cyl 3 4 6 misfire counts every time. The fuel metering block gas been updated, and the intake gaskets have been replaced and resealed and a tune up was done recently. I want to say...	View
	2001 Chevrolet Suburban 1500 5.3L security system VIN: 3GNFK16T31 this truck came in on a tow truck. had no fuel pressure, checked powers and grounds and determined that fuel pump was shot. replaced fuel pump and fuel pressure returned to normal and truck started but then stalled. after a couple more times i realizes the ant...	View
	2004 Chevrolet Cavalier 2.2L Speedometer, Fuel level VIN: 1G1JC52F64 This car has a fuel gauge and spedo. that most of the time are not working proper, Spedo. reads 20MPH sitting still and fuel reads way above full. All the rest of the gauges read fine. Thats why I don't think it's a power or ground supply? Does anyone have a t...	View
	2006 Chevrolet Express 1500 5.3L Hesitation, Cuts out, Misfire VIN: 1GNFH15T36 customer drove van to texas from illinois and back, every morning they would start out and at a temp gauge reading of about 180 to 185 degrees, the van will loose power at about 75mph start to backfire and shudder, until customer pulls to shoulder and idles it...	View
	1984 GMC 7000 4.9L engine brake VIN: J8DM7AIN2E truck came in with alternator overcharging melted combo switch blew all bulbs repaired charging system and combo switch now no power to engine brake solenoid i have no wiring diagrams dealer doesnt have one either if someone has a diagram i would appreciate it...	View
	1997 GMC c6500 .0L Unknown VIN: A6464TBD66 hi there, not sure if i should be posting this vehicle or not being a medium duty truck, only doing this as a favor for good customer. Anybody w/big truck/brake experience? PROBLEM: Is not an air brake system, is a hydro/electric park brakesystem, problem is i...	View
	2000 Oldsmobile Intrigue GL 3.5L Mechanical VIN: 1G3WS52HXY I have to come to the table and ask a general question of the group. This may sound elementary but my customer's engine has developed a thirst for oil. She has had me perform her routine services for several years and for about 14,000 miles but only in the las...	View
	1997 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K2V Veh. towed in, started, thick cloud of steam out exhaust, . Inspected upper penum, cracked. Replaced penum, and lower intake seals,[oil leaks]. Veh. started, ran fine. On test drive, DTC P0401 set on the 3 test count, inspected EGR valve, would open, but stick... Trouble codes: P0401	View
	2002 Pontiac Grand Prix GTP 3.8L egr low efficincy VIN: 1G2WR52132 OK i have a 2002 grand prix s/c. i have been working on this vehicle for a couple of weeks. I have replaced the egr valve and the cleaned the passages. the map sensor is changing with the rpm changes. the exhaust is factory with no damage. we have reset the ec... Trouble codes: P0401	View
	1998 Saturn SL1 1.9L loosing oil VIN: 1G8ZH5280W The car is loosing 2 qts of oil every 1000 miles no leaks are present pcv not cloged	View
	2000 Saturn SL1 1.9L Fails readiness moni VIN: 1G8ZH5287Y Failed OBD Emmission State inspection for readiness monitors NOT READY. ( Catalyst, Evap system, O2 sensor, EGR System) O2 Heater and AIR are Ready. Customer drove car 1290 MILES and same results. No pending codes. Checked with scan tool for tests run by telli...	View
	2002 Saturn L300 3.0L shifter VIN: 1G8JW54R22 Hello again I have a saturn l300 thats been towed in twice the first time it was a crank no start,no fuel i sprayed intake cleaner in intake a car started but car would not come out of park most if not all of dash cluster was inop. and remote pad for locks wou...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5335L well we try'd to seell the customer the a i r pump and a cleaning on the valve but customer don't want to take a chance on the valve being no good after replaceing the 250.00 pump + labor ,looking at the valve a little closer i can see that it has debris insid... Trouble codes: E, 49 (a i r management system problem).	5
	1991 Cadillac DeVille 4.9L oil pump? VIN: 1G6CD53B6M OK,Here,s the scoop.The pump lost prime,this apparantly can be avoided by first draining the oil,refilling the crankcase,then go up top and change the filter.I have never done it that way but will from now on.I tried all suggestions to get oil pressure back bu...	15
	1992 Cadillac Seville 4.9L ac controls VIN: 1G6KS53B7N i have not repaired this vehicle because the customer did not want to spend the money that would be required to repair this vehicle. there is a feed wire under the dash that is shorted to ground. thank you to ed and mitchell in texas, josh in miss. mitchell in...	7
	1994 Chevrolet C1500 Suburban Silverado 5.7L Excessive Emissions VIN: 1GNEC16KXR Howdy again, Well the cleanings and a new converter got this pig past the inspection, but what I think happened it that one of the injectors is not closing properly and since this is a batch fire type deal with only one o2, it is running one injector lean and ...	14
	1997 Chevrolet K1500 Suburban LS 5.7L experiment VIN: 1GNFK16R4V i went ahead and tried it. was able to keep it at seventy but with the overdrive off. i took a guess at which cylinders to kill. was smooth above 2000 rpm with light load. noisy while accelerating up overpasses. i only ran for about an hour. had my wife with m...	7
	1998 Chevrolet Astro 4.3L hard shift VIN: 1GNDM19W3W Ended up being a short in the wiring harness to the transmission... Thanks	3
	2003 Chevrolet Malibu 3.1L Coolant VIN: 1G1ND52J83 Only time will tell if this Malibu is fixed for sure. In response to some of the replies, there was no combustion gasses in the cooling system. The trans cooler tested, ok. I pulled the intake and inspected. It appears that the intake gasket may be allowing oi...	75
	2004 Chevrolet Impala SS 3.8L engine VIN: 2G1WP52174 I would like to thanks everyone who helped me with this vehicle. I removed the oil pan and inspect the rod & main bearings and inspect the cylinder & pistons. What I found was a scored #4 cylinder and piston. The rod bearings you could tell had gotten hot a...	14
	2004 Chevrolet Express 2500 LS 6.0L Misfire, MIL Lamp on well everyone i fixed this one it was the 7 and 8 injectors fixed the problem after all that diag and all the help from all of you all out there also flushed all the fuel and put new fuel all checked out ok after that Trouble codes: P0200, P0300, P0155.	6
	2004 GMC Sierra 1500 SLE 5.3L Stall, Misfire VIN: 2GTEK19T34 This fix turned out to be rather dull. The original B2S1 02 sensor was stuck at 0v so the right bank was running very rich. I replaced that 02 and the new one stuck at 1.102v when it was cold then after about 5 min would switch normally. So when it went into...	13
	2004 Oldsmobile Alero GL 2.2L Unknown VIN: 1G3NL52FX4 thanks guys micheal was right on we replaced the mounts but let it sag a little while tightening - jacked it up and re-tightened mounts and alls well	3
	1993 Saturn SL2 1.9L Excessive Emissions VIN: 1G8ZJ5577P I did not fix this one although I believe the problem to be the valves. It did not use oil, which would have been an indicator if Matthew's suggestion of the scored cylinder [...] would have been the cause. His experience with this engine with carbon buildup ...	6
	1996 Saturn SL1 1.9L readiness indicators VIN: 1G8ZG5285T This one seems to have a happy ending guys although I haven't had an active part in the resolvement. My customer had repeatidly missed her appointments (she is a student in Virginia and I am here in New Jersey) and now has since returned and went to NJ state ...	10

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