GM Automotive Technicians Technical Discussion and Fixes for Mar 11, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2002 Cadillac Seville STS 4.6L Misfire, MIL Lamp on VIN: 1G6KS54Y02 hi to all autotechs ,this car came fronD another shop, they replace 2 coil packs , fuel pump ,plugs , fuel filter, and maf it have a p0300 randon misfire THE MISFIRE ONLY HAPPEN BETWEEN 1300 RPM AND 2000 RPM THE CAR CAN BE IN PARK OR UNDER LOAD , the fuel STFT... Trouble codes: P0300 (Random misfire)	View
	1993 Chevrolet K2500 Silverado 6.5L Wippers VIN: 1GCHK39F5P Checked fuse looked for chafed wires at tilt wheel but if you turn the dim lights on the wippers turn on	View
	2000 Chevrolet S10 Xtreme 2.2L Steering VIN: 1GCCS1441Y this truckcame in with a complaint of the steering is hard to turn and it wont return to center after you make a left or right turn. I test drove the truck, and noticed when turning that the steering wheel will no return, I would have to turn it back my self.c...	View
	2000 Chevrolet S10 2.2L engine temp VIN: 1GCCS1941Y heater has been working great, engine was running at 200. Then customer said temp was running at 160, heater not so great. changed thermostat for customer, same problem, bleed system,no help, changed stat again (195) same problem. pinched off heater hose no ch...	View
	2004 Chevrolet Impala 3.8L ABS Module? VIN: 2G1WF55K84 Customer complaint (fairly new owner) states that he hears a ratcheting sound from what he believes to be abs self-test everytime he comes to a stop (can be heard outside the car by other drivers). Happens about 12 mph. Only happens when vehicle is warmed up, ...	View
	2004 Chevrolet Tahoe LT 5.3L Temp VIN: 1GNEK13234 Hi Guys, I have a problem with an auto temp system in a Tahoe. System heats well on 90 degrees, Turn to 89 degrees and it will start blowing cold air. Has code B0164 code stored, inside air temp sensor Scanner shows 131 degrees at all times with temp sensor ...	View
	2004 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GAHG39U64 04 chevy 3500 express 6.0 came in with dtc's p0174 system too lean (bank 2),p0175 system too rich (bank 2)and p0300 multiple/random misfire detected.test drove the van while cold and hot conditions and could not duplicate customer complaint of lack of power...... Trouble codes: P0174 (Fuel system too lean bank 2), P0300 (Multiple/random misfire detected)	View
	2007 Chevrolet Cobalt LS 2.2L Cuts out VIN: 1G1AK15F37 The problem they are having is that intermitantly they will get a no crank problem, they will let it set for a while and then go and get in it and it will start. Then sometimes it will have no power, may be missing and the ses light will come on and the low po... Trouble codes: P1682 (Ses light will come on and low power light in the dash. Cannot find discription)	View
	2008 Chevrolet Express 3500 6.0L Hydro boost VIN: 1GBJG31K38 Hello iatn tech i have this mini bus and all we did was flush the power steering system and now the hydro boost is make a crazy noise.when you push the brake pedal it make a loud noise and vibrates real bad.i followed the bleed proceedure and still no differen...	View
	2001 GMC Savana 2500 5.7L MIL Lamp on, no communication VIN: 1GTGG25R81 tech 2 will communicate with factory pcm but will not with alternate fuel module only runs on gasoline checked wiring from alt module to factory pcm no problems found service engine light flickers and so does fuel switchover disconecting alt module ses light s...	View
	2002 GMC Envoy SLE 4.2L hard to start warm VIN: 1GKDS13S42 I have an envoy kicking me in the nuts right now.. customer came in and stated that after engine has been running and warm that sometimes it will not start back up. i duplicated problem and found that if you press the gas pedal it would start back up and smell...	View
	2005 GMC Sierra 2500 HD 6.6L braking VIN: 1GTHK23235 this truck has hydro boost system and abs. When slowing to stop, at the last of the roll, under 8 mph, the pedal falls, braking is reduced but does not completely fail, and the steering wheel jerks to the right. There seems to be many possible causes, would ra...	View
	2008 GMC Sierra 2500 HD SLE 6.0L Wipers VIN: 1GTHK24K28 Wipers won't shut off even with key out & door shut. Must remove fuse. Scan tool indicates bcm is deactivating the wiper relay. Relay is part of the power distribution box & is not servicable separtely. Has any one seen the bcm being bad or is it just a stuck ...	View
	2006 Other GM H2 6.0L ride control VIN: 5GRGN23U63 air pump comes on 10 to 15 sec intermitantly only in gear,	View
	1998 Pontiac Sunfire SE 2.2L cooling system VIN: 1G2JB1246W well this car is like a bad bad nightmare, customer stated she had just bought this car from a by here pay her lot. the salesman told her the vehicle needed a thermostat there for it has no heat. she got him to take off 3 hundred dollars. she then took the car...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Chevrolet S10 4.3L Poor Idle Quality, Hesitation VIN: 1GCCS19X3T thanks for all the replies, we continued testing different systems and tried replacing some parts to check for improvements. what we discovered was that this vehicle actually had three separate problems. the biggest problem we found was in the transmission.... Trouble codes: P0300 (Misfire random).	30
	1998 Chevrolet K1500 Silverado 5.7L No Start VIN: 1GCEK14R9W got a lot of replies to this one although had most read to the end theyd have realized the fix they were recomending had already been done as should be done before posting. what i was really looking for was a response on the code. one person and thats all ou... Trouble codes: P1351.	41
	1998 Chevrolet C1500 Silverado 5.7L Cuts out, Stall VIN: 2GCEC19R7V Again iAtn proves to be the best. It is the fuel pump. when cranking it in morning Fule Prssure will drop 45 psi if you keep cranking and when started will not go more than 55 psi when WOT and bogs or die. I hooked up and secondry fuel source (SNAP ON FUEL CAR...	28
	1998 Chevrolet Cavalier 2.2L Timing Chain VIN: 1G1JC5246W No idea why the seal was mangled, but it was. The chain tensioner was broken again, so I replaced it with one from another vendor. After feeling the customer out about their plans for this car, I decided against replacing the whole timing set again and doing...	18
	1999 Chevrolet K1500 LS 5.7L Starting replaced the ignition switch and lock cylinder,works great, thank you to all the replies	16
	1997 GMC Savana 2500 4.3L Hesitation, Surge, Misfire VIN: 1GTFG2FW6V well this one is back on the road. I received 4 replys and although there was no one with an answer as to what to look for,they were a great help just the same. the ones I did get were a help anyway because they did help eliminate some on the wrong direction I... Trouble codes: P0300.	4
	2005 GMC C7500 Topkick C7H042 7.8L pto VIN: 1GDK7C1325 Thank you Rob,Joe,William and John for all the information. I installed the pto switch and took the truck to my freindly GMC commerical truck dealer. They progammed the pto speed at 1100 rpm and all is well.Thanks again for all the help. Mike	4

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