GM Automotive Technicians Technical Discussion and Fixes for Sep 28, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1996 Cadillac Seville STS 4.6L antitheft VIN: 1G6KY5294T The car will run and then will die in three seconds a message on the dash says "antitheft system problem" and "car will not start" , but the car will start and dies on three seconds always.	View
	2004 Cadillac SRX 4.6L Drive-axles VIN: 1GYEE63AX4 Customer indicated heard snapping noise while accelerating thru a u turn. We confirm the noise is also on heavy accel in a straight line. Can also do it at slow speed while holding brakes and gas at same time, all fluids are clean in the diffs and t case, can ...	View
	1971 Chevrolet Corvette 5.7L Excessive Emissions, No Start, Surge Here we go. This is one a friend of mine is calling me in for. He has done a COMPLETE overhaul on this car. Started it about 10 years ago!!! The car is finally done. We rebuilt the original motor with all stock replacement components (this past spring). No "pe...	View
	1991 Chevrolet C1500 Cheyenne 4.3L Stall VIN: 1GCEK14Z6M When test driving this vehicle it comes to a stop and if you sit at a stop sign it feels like it has 1 miss and the car catches itself and it will do it again and stall most of the time. It feels as if the key is being shut off, thats how sharp of a stumble. A...	View
	1999 Chevrolet Express 3500 LS 5.7L will not accelerate VIN: 1GAHG39R1X all PID values are in spec, fuel pressure is 60-66 no codes presant in comp. van starts and idles as soon as you accelerate engine either dies or pops an intake, has anyone seen this problem where the 5.7 will not accel. and all necceary things are needed to r...	View
	2000 Chevrolet Blazer Trailblazer 4.3L Transfer case into Low VIN: 1GNDT13W5Y Vehicle came in shifting into 4low on its own, code B2725 With scanner, press button on switch and nothing changed in data stream. replaced switch and problem went away, code was cleared and didn't come back. Over a month has gone by now the 4x4 light came on ...	View
	2002 Chevrolet Impala 3.8L security lamp VIN: 2G1WH55K32 Thanks in advance for all of your help. The security light on Driver's Information Center comes on randomly and does not affect operation of the car. The customer has been driving with an intermittent security light for about 2 years without any troubles. At f...	View
	2003 Chevrolet Trailblazer LT 4.2L Crankcase VIN: 1GNES16S63 Thanks in advance. Got caught with my pants down on this one. Vehicle comes in with a overheat complaint. Found oil and coolant contamination and coolant loss. I ASSUMED, headgasket. Broke every head bolt on the way out(didn't rap hard enough). removed head ...	View
	2005 Chevrolet Aveo LS 1.6L Poor Idle Quality, Stall, MIL Lamp on VIN: KL1TG52605 Hi, I'm an automotive instructor at a community college and have never worked on an Aveo before. This is a student's car. She says that it sometimes stalls when she slows for a corner and the idle does fluctuate and come close to stalling in the shop. It ru... Trouble codes: P0140 (rear O2)	View
	2006 GMC Canyon SL 2.8L MIL Lamp on VIN: 1GTCS14826 Car came in with low power warning on message center. We scanned computer system found code p0017. Also multiple codes in history. p060e, p0121, p2101, p2119,p2135. These history codes have not returned after reset, but code p0017 resets right away. The data s... Trouble codes: P0017	View
	2003 Oldsmobile Silhouette GLS 3.4L Cuts out, Stall VIN: 1GHDX13E33 Van came into shop with what the owner called a trans problem, in driveing the van, the engine seems to cut out at times, like a bad engine missfire, no codes stored, check plugs, wires, and coils all good, replace MAF no change, this is not a trans problem, h...	View
	1994 Pontiac Bonneville SE 3.8L front crank seal VIN: 1G2HX52L7R This car is driving us crazy! Customer came in with oil leaking from car. We replace valve cover gaskets which are fine now, also front crank seal. Ran car for 5 minutes in the shop just fine then oil started pouring out of front crank area. We replaced the fr...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1986 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G4HR3737G With all of the responses I received, I can say it is what I expected. I do know about the roughness this motor had when it was built. I also wanted to change out the plugs with delcos. But dealing with a car that has been to other shops and trying to start fr...	23
	1997 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52YXV severed ground wire making intermitent contact setting the codes . replaced the whole wire and passed deq finally . thanks to all !!! Trouble codes: 135 (137 -), 137 (155 -), 155.	15
	1999 Cadillac DeVille 4.6L Headgaskets VIN: 1G6KD54Y7X Well, the concensus is in. Stick with the factory method. I was leaning in that direction anyway, just because that's what I have always done - with never a problem. Most all of you concurred with my feelings. A few stated that they have used straight torq...	13
	2002 Chevrolet Trailblazer LS 4.2L Ignition VIN: 1GNDT13SX2 I'll try to make a long story short: As I followed through the wiring diagram for the ignition circuit, I discovered there was no power at some of the wires at the ignition switch that were supposed to be hot. In tracing back, I found fuse 34 (Ign. A) was bl...	11
	2003 Chevrolet Suburban 1500 LT 5.3L No Start VIN: 3GNEC16Z43 Hello guys ,it"s a wonderfull feeling when the car is gone and fix right.,,thank Bill from pensilv, the ground in the back of the head , it look good from the out side ,but when i grab it it was holdind on one thread ,lol, thank you all.	14
	2005 GMC Canyon Z71 SLE 3.5L abs VIN: 1GTDT13675 tryed one more set of bearing and sensor from napa took my time and was very carefull on install. all worked great no problems.thank for help and conferming my thoughts no defective parts or wrong install.	9

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