iATN Member GM Auto Repair Tech Exchange for July 23, 2009

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Open Help Requests for GM

	Help Request	Answers
	2003 Buick Rendezvous 3.4L ABS RR wheel speed sensor Greetings all, Need a little help if possible on this one. Got an AWD 03 Rendezvous here that has a reoccurring ABS code c0050 RR ABS sensor. The bearing was replace before and the owner opted for the higher end lifetime one. I inspected the abs scan data whil...	View
	1992 Cadillac Fleetwood 4.9L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire Hello guys, having a bit of trouble with this one. 1st cold start starts and runs poorly, rich, missing surging black smoke and sometimes dies. Some times it will after running this way in the shop for 5 minutes or so begin to idle fine again with a little rou...	View
	1985 Chevrolet S10 2.8L coolant/oil Hello, We have oil in the anti-freeze. No other problems at all. My tech thinks that if it was head gasket or intake there would be anti-freeze in the oil. He thinks someone added something to cooling system. Customer says no. Any ideas on what we are dealing ...	View
	1999 Chevrolet S10 4.3L Unknown customer states truck will die randomly. then will not crank/start. has had truck towed in twice now for same problem. first time early june could not duplicate problem. drove numerous times. checked for codes, tsb's etc. nothing found. later in june towed in ...	View
	2000 Chevrolet Suburban 1500 5.3L MIL Lamp on we have this truck with bank 2 sensor 2 o2s reading 60 to 80 millivolts have replaced convertor 2 times have replaced o2s 3 times with oe units resealed intake gasket ,valley pan replaced pvc valve still have code po137 no other symptoms bank 1 all normal Trouble codes: p0137 (bank 2 sensor 2 lean).	View
	2002 Chevrolet Corvette 5.7L seering assist i replaced the balancer on this corvette and had to remove the steerin gear to do so. when i got it back together i had no assist at idle. i flushed the system to see if there was contamination and it got better in the bay. after a test drive however the same ...	View
	2003 Chevrolet Impala 3.4L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on I am trying to help a friend and diagnose his car over the phone cause i wont get a chance to look at it for about a week. He called me about a week ago with misfire, he borrowed a scanner, p0300, he replaced plugs and found one that the ground strap was actua... Trouble codes: p0300 (random misfire).	View
	2006 Chevrolet Tahoe 5.3L MIL Lamp on we have scanned solenoid with snap on scanner and run thru all diag flow charts for these codes and come up with replace pcm every time.solenoid does not operate when commanded to.is it true that the pcm will have to be replaced or can it be reprogrammed.thank... Trouble codes: 449 (evap control solenoid), 443 (evap control).	View
	1995 GMC K1500 Suburban 5.7L Distributor Hi, Thanks to all for any help. This vehicle came in running real rough,stalling,etc.Customer had diagnosed elsewhere for bad intake and wanted us to do the job. My so called mech verified intake leak, pulled dist without marking anything and after days, canno...	View
	2003 GMC Yukon Denali XL 6.0L Electronic has code B0414 temp control feedback range problem. blows warm air. if you press the a/c button then the compressor goes off and blows warmer air, rear ac system works fine. I have a tech 2 but don't understand the data. Which one is blend door motor and what ...	View
	2004 GMC Sierra 2500 HD 6.6L power door locks and windows hi people this is my own truck 04 duramax 2500hd power door locks and window dont work i check IATN and people said to replace door module and reprogram BCM so i sent it to the dealer i cant reprogram car here yet the dealer said they cant reprogram it because...	View
	2006 Hummer H3 3.5L battery concern battery dead found parasitic draw of 1.8a . continued to diag by removing fuses to narrow down to one circuit. removed fuse #13 rdo radio,heating, ventilation. amps droped by .8a the total draw was not eliminated so continued on fuse #14 droped .o6a bo...	View
	1991 Pontiac Grand Prix 3.4L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on I am begging for everyone's help on this one! I have has this problem child for a while now and it is at the point where I need to solve this car soon before I lose what sanity I have left. This car has had a engine rebuild done by myself about a year ago. I h...	View
	2002 Pontiac Grand Am 2.2L No Start hey guys, have a problem with a 2002 pontiac grand am w/2.2l ecotec engine. owner towed vehicle to shop for a no start condition. it seems he purchased the vehicle with a blown engine. he then purchased a used engine with 50000 miles from an individual. he in...	View
	2002 Saturn L200 2.2L alternator this car came in on the hook dead battery. charged battery, no alternator output. replaced alternator. car is now charging 14.1 but the battery light is on, and code p0662 is set. f terminal on scan tool is reading 0%. hooked a test light between the f teminal...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2002 Buick Regal 3.8L shifting WELL ITS FIXED,REMOVED THE SIDE COVER AND REPLACED THE INTURNAL HARNESS AND PRESSURE MANIFOLD ASSEMBLY AGAIN AS THE P1887 KEPT COMING BACK. THANKS FOR ALL THE GREAT INFO,MATT	3
	1993 Chevrolet K2500 5.7L Hesitation, Surge, Cuts out Thankyou for the great responses, this is the best tool in the shop. Customer had been think of geting a new truck and found a good deal and took it. Many were steering me towrd a fuel mixer or valume problem that probly was is. I am sory for the way the me...	23
	1998 Chevrolet Corvette 5.7L driver info center thank you david from arizona the cluster was at fault but i sent it out to be repaired at specialty shop,a new cluster was 700 and the rebuild was only 329 to us, all is well. thanks again	3
	2001 Chevrolet Silverado 2500 6.0L No Start the truck is fixed thanks the for the help guys its great to have support . i removed the starter the ckp was hooked up treid to pull the tape off around the pig tail so i could test the wireing and sure enough the wire on the end pulled out the others where ...	7
	2003 Chevrolet Suburban 1500 5.3L radio Sorry folks, I havn't been able to get the owner to bring this suburban back in. Seems he is content listening to a battery powered radio on the front seat. What I learned was that if the vehicle has a BOSE system and a console, the amplifier is at the rear of...	9
	2004 Chevrolet Tahoe 5.3L Rear heater /AC Thanks for the two replies - one stating possable wiring problems and one tech saying the need for the Tech II scan tool for relearn. This vehicle has been fixed -- spent a lot of time trail and error on this one ..."trying this and trying that" but here is w...	2
	2004 Chevrolet Cavalier 2.2L Slave Cylinder Replace slave cyl. assembly again, couldn't see any real problems causing the slave cyl to fail. This unit is all one piece design, with frt seal and throw out bearing attached. Used OE unit and not a cheap fix. Used Clutch Dr. Last clutch install and tha...	6
	2005 GMC Canyon 3.5L abs replaced ecbm and it was fixed. gm has had alot of problems with this issue. its crazy to have to change both speed sensors and ebcm when you replace pads and rotors.thats gets expensive. i would tell every one not to buy a cayon or colorado unless you want t...	7
	1988 Pontiac Grand Am 2.5L No Start thanks for all the info.the fix ended up being the crank sensor.i had good fire at cranking and good cranking rpms.replaced sensor,problem gone.thanks again!	19
	1994 Pontiac Bonneville 3.8L Hesitation Thanks to those who responded. Had the tech recheck inputs and outputs at the computer. All inputs were good, but injector driver circuits were erratic when the problem was occurring. Replaced the ECM, and problem is gone. Trouble codes: P0341.	3
	1996 Saturn SL2 1.9L readiness monitors WELL,AFTER A BUNCH OF REPLIES THAT ALL PRETTY MUCH INDICATED THAT THE COOLANT TEMP SENSOR/HARNESS CONNECTOR WERE THE PROBLEM,I TESTED EVERYTHING OUT WITH NO PROBLEM FOUND.SO,IN LIGHT OF THE FACT THAT RHODE ISLAND ALLOWS 2 MONITORS TO BE "NOT READY" AND STILL G...	11

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