iATN Member GM Auto Repair Tech Exchange for March 7, 2008

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Open Help Requests for GM

	Help Request	Answers
	1993 Cadillac Fleetwood 5.7L No Start I have run out of ideas. This vehicle has a very extended crank when temperature is below about 35 degrees farenheit. I has spark and fuel and will eventually start. Has no codes in pcm but shows quad driver fault-yes, also noticed the Intake Air temp jumps ba...	View
	1996 Chevrolet Tahoe 5.7L No Start I have a hair puller. This 1996 Tahoe will not start when it is cold; around 40 degrees or less. It will crank fine, has good fuel pressure according to Mitchell, and fuel pressure holds good without leaking off. When it cranks it will try to start. It sounds ...	View
	1999 Chevrolet Silverado 2500 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
	2001 Chevrolet S10 4.3L #1 Spark Plug We are a Euro car repair shop but 1 of the guys has an ongoing problem with personal vehicle. He has replaced plugs several times, valve guides/valve job, oil consumption very high...intake full of carbon & oil ...would appear to be some type of PCV/ breather ...	View
	2003 Chevrolet Trailblazer 4.2L Hesitation, Cuts out, Stall, MIL Lamp on Vehicle came to us with very bad runability symtoms, started with basic maintanance ( filter, fi service ). Solved problem and ran great for 3 days, returned with check engine lite on 1345, cannot duplicate symptoms...cam and crank signals good, no drop, vref ... Trouble codes: p1345 (CKP-CMP correlation fault).	View
	2005 Chevrolet Colorado 2.8L Mechanical Help please. I have a fleet truck here from Napa and have a reaccuring brake issue. The problem is every time you brake it wants to nose dive just on the front brakes. Brought it in and clean and adjust rear brake because they were barely touching and all is f...	View
	2006 Chevrolet Silverado 3500 6.6L Poor Fuel Economy we havent done any physical testin yet other than scanning or dtcs.the vehicle emits an odor that customer describes as ammonia like. when i drive it the smell is awful and will come through the heater vents, and is worse on the passenger side near the cat. if...	View
	2006 Chevrolet Silverado 3500 6.6L No Start I have a customer that just bought this 2006 K3500 6.6l duramax truck at an auction yesterday. It was sold "as is" because it won't start. He had it towed to my shop to have me get it running. I don't have any experience with the Duramax but I have worked on t... Trouble codes: p0336 (ckp sensor out of range).	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
	2000 Oldsmobile Silhouette 3.4L Surge Help, GM techs! This vehicle is owned by a very good customer of ours. The 2 complaints, are Check Engine Light coming on (numerous times last year - most not documented) and jerking while driving down the road after a hot run, such as interstate driving then ... Trouble codes: P0131 (HO2 1-1 voltage too low), P0137 (HO2 1-2 voltage too low).	View
	2000 Pontiac Sunfire 2.2L Radio We've got this Sunfire that came in for a battery going dead. Checked for draw, nothing significant - 70mA - not enough to kill it overnight. Noticed the radio was inop, fuse was pulled. Installed fuse and now radio display stays on even after exiting vehicle ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Cadillac Seville 4.6L Transaxle input sensor Thanks to all that replied. After driving the car more and check the transaxle input sensor wave form at the pcm another code come up P029 shift solenoid 'B' which is also pretty common on these cadies. I pulled lower pan and saw the shift solenoid Broken I re...	4
	1989 Chevrolet C1500 4.3L Poor Idle Quality thanks to all that replied, all the info received was of great assistance but phillip hit this one. i know i checked the grounds at the timming control module earlier but may have bummed the harness and got a pretty good reading.however g107 at tstat had up t...	10
	2000 Chevrolet Express 3500 5.7L stalls at high rpm Thanks to all who answered my cry for help. As time went on and the test drives continued, the fuel pressure started dropping down to 50 psi at 50 mph. It was a noisy ride with the engine cover off but many of you suggested I make sure the fuel pump could ke...	14
	2004 Chevrolet Suburban 1500 5.3L No Start Thank you to all who replied. As I stated the customer picked up the vehicle. It is a flex fuel vehicle and this was only the second tank which had been used of E-85. After 200 miles the customer added regular fuel and the vehicle started to run and start bett...	4
	2003 Hummer H2 6.0L RF Dash Thanks for all the information. I tried all the suggestions but could not locate the noise. The owner did not want to persue the noise any farther. If I get the vehicle back in and find the problem I will edit this fix. Thanks again.	3

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