GM Automotive Technicians Technical Discussion and Fixes for Jan 18, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2003 Buick Century Custom 3.1L starter VIN: 2G4WS52J33 customer towed in his car with a no start problem. he said vehicle wouldn't start so he replace the starter and no luck so he towed it to the shop. I scanned it and no codes showed but i noticed that the security light stays on when u turn key on, i tryed repr...	View
	1975 Chevrolet Caprice Classic 5.7L ride heights VIN: 1N69H5J206 chasing what is suspected to be rear end vibration. tailshaft has been rebuilt and balanced by specialist driveshaft repairer. vehicle seems quite low in rear end and wondering whether this is affecting pinion angle to cause vibes. cannot find specs on suspens...	View
	1988 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCDC14K8J there it no grd signal to egr control valve and other related components at any time, off idle throttle, at hyway speed, in any gear.. other wise the truck runs fine nox is way too high dont know this system, can u point me in the right direction, i could even...	View
	1991 Chevrolet R2500 Suburban Silverado 7.4L Blows Fuse VIN: 1GNGR26N3M Dear transmission/electrical gurus. I have this suburban that will blow the "trans" fuse very intermittantly.the customer says when he is towing his scca car and the temperature is "hot" outside is when this happens.mitchells wiring diagram isnt very helpful i...	View
	1994 Chevrolet C1500 4.3L Clutch throwout bearing Hello everyone, I have this customer who has had a clutch job done to his truck back in March of 2011 (and then again in September of 2011); and now, he has come back and the throw-out bearing is totally damaged and not sure why. The input shaft on which it s...	View
	2001 Chevrolet Tahoe 5.3L Poor Idle Quality VIN: 1GNEC13TX1 Hi All Thanks in advance for taking a moment. my problem with this chevy is a very low idle. just above 400 rpm. so it dies when a load is put on it at idle. This truck is drive by wire (no cable) I cant find the idle air control valve. Mitchell and all data ...	View
	2004 Chevrolet Trailblazer LS 4.2L timing VIN: 1GNDT13S14 Hi Guys, I R&R'd a head on this 4.2 Trailblazer for a #4 miss with leaking exhaust valve. Initially it was giving me a lean code. After looking over everything, I saw the CMP sensor did not seat properly. After fixing that I got the dreaded P0016 CMP/CKP Vari...	View
	2005 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK19T35 This truck runs very rich the lt fuel trim is about -17 on both banks but when it is cold the truck will not start sprayed intake for vacuum leaks none found, pickup does not have a fuel pressure regulator to leak fuel pressure is at 62 psi, ran vehicle with m... Trouble codes: P0171 (p0172-), P0172	View
	2006 Chevrolet Silverado 1500 LT 4.8L #1 Fan Relay VIN: 2GCEK13V46 Ok this is complicated. The Truck came in with the complaint of the truck not starting because the battery was draining beacuse the cooling fan was staying on and the truck was stalling. we found moisture and corsion on the pcm. Replaced the pcm and cleaned th...	View
	2006 Chevrolet Trailblazer LT 4.2L abs VIN: 1GNDT13S56 This is my wife’s and as we all are aware that seems to be the "one" vehicle that Murphy’s Law kicks you in the shins on every time. This thing has set a code C0196 off and on from the time we bought it with 12K miles on it. I finally got it in the shop to get...	View
	2000 GMC Sierra 1500 SL 4.3L motor VIN: 1GTEC14W0Y truck ran great it was parked for four days no start now cap rotor wires two months old fuel pressure on rail is good also have good spark while checking coil with key on im hearing a ticking or clicking noise inside intake injectors maybe fuel pressure regula...	View
	2007 GMC Sierra 2500 HD Classic SL 6.6L defaults to neutral Hi everyone Thank you all in advance for any input you may have. According to the Vin this truck is 2007 but the emission label states 2006, just FYI. This truck came in with the listed codes, along with P0826 Up and Down shift switch circuit, and P0827 Up and...	View
	2000 Saturn SC1 1.9L timing cover VIN: 1G8ZP1285Y Hello fellow techs everywhere have a question for the saturn techs. I'm trying to replace the cylinder head gasket on this fine vehicle but do not have the special tool ($750.00)to hold the crankshaft sprocket while removing the timing cover. Are there any oth...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1963 Chevrolet Corvair Monza 2.4L Poor Idle Quality, Stall VIN: 30927W1195 99.9 percent of the replies said the idle circuits were plugged. You were correct. I must not have gotten all of the passages clear. Soaked in Berrymans cleaner and blew out all passages. Followed up with castle carb cleaner making sure all orifices were clear...	24
	2002 Chevrolet Impala LS 3.8L battery VIN: 2G1WH55K72 Thanks to all who answered. With the holidays and such and the customer had a second vehicle, we took a little extra time to get to the root of the problem. As I stated in my update, the radio & IPC seemed to be the culprit. If either was off the network, v...	29
	2004 GMC Yukon XL 1500 Denali 6.0L Hvac VIN: 1GKFK66U64 Turned out to be the blower motor. Got a used one from a rig that only had 18,000 on it. Everything works now! By the way, the first control module I got was from NAPA. I did end up getting one form the dealer too, opened the box and it was the EXACT same ...	10

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