iATN Member GM Auto Repair Tech Exchange for June 26, 2008

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick Rendezvous 3.4L All Windows Customer brought vehicle in with the complaint of intermittent window operation, we were able to get windows to fail all the time, pulled codes and found B1477 RAP relay control circuit low and B1507 Low voltage on control circuit, we performed test and pinpoi...	View
	1994 Cadillac DeVille 4.6L Starting This car came in as a no start, no crank at times. We found that when the car does not start and then any of the doors are opened it will then start. Even when holding the key in the start position when its not cranking and the door is opened it will start to ...	View
	1999 Cadillac Seville 4.6L suspension cadillac techs i have a 99 seville with a crunching creaking noise when you first take off from astop sign it will do it until you get over 25mph then the noise goes away until the next start could this be strut noise of maybe a mount this has auto suspension ...	View
	1986 Chevrolet Corvette 5.7L air condition Customer was told by friend that he could use 409 freon (commercial)as a replacement for R12. Friend said he did it and its actually colder than r12. Has anyone heard of this or tried it? I tried to get him to buy r12 on ebay but friend has 409 freon he will g...	View
	2002 Chevrolet Cab & Chassis Silverado 6.0L oil pressure Vehicle was towed in.Customer stated after a 50 mile drive the oil pressure was almost to 0 and engine was making noise.They were at their destination at that time.The vehicle sat there for 7 hours when they started the truck the pressure came back up and engi...	View
	2002 Chevrolet Silverado 4.3L MIL Lamp on After we changed the cam and the Dist. we have had a constant misfire code on #1 and #4 cylinder. The vehicle runs perfect and the scope pattern at the computer for the cam and crank sensors are good and do not shift or move. When I overlap the two patterns th... Trouble codes: P0300 (1 and 4 misfire since we changed the cam).	View
	2004 Chevrolet Suburban 6.0L Compressor ? Hello All, need some help with this suburban. It does have Dual Zone HVAC, as well as rear Heat & AC. The problem is...the front vents puts out 78 deg air ( was 89 today )and the vents for the rear AC puts out 44 deg air. Sounds like I would have a Vent proble...	View
	2005 Chevrolet Impala 3.4L fuel SOME ONE put candy in the fuel tank.. what is needed to fix this problem...NEW PUMP and FILTER for sure.. but will there be any other things needed other than that?	View
	1990 Geo Prizm 1.6L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall OK I am puuling my hair out on this one!! The car starts fine, sometimes when it is cold it will stall one ot two times right away, but starts right back up. As you start to drive it (with no warm up period) the car runs GREAT, but then after about 3 to 4 city... Trouble codes: 12 (No RPM signal for 2 seconds).	View
	1997 GMC Safari 4.3L engine Thank you all Techs for help in advance. My problem is cylinder 1 and 2 are not working. I have good compression good fuel pressure and good spark. I have replaced spark plugs and still no luck. This van came from a different shop where they replaced the fuel ...	View
	2002 GMC Yukon 6.0L secutity i know passlock problems are a crap shoot but i got extra info with this one. the MIL doesn't come on with the ignition. the complaint is the security kicks in occasionally leaving her stranded in 10 min intervals. BCM kicks a B2960 sig incorrect but valid, no...	View
	2001 Oldsmobile Alero 2.4L battery thanks in advance for any pointers. customer states that vehicle had to be jump started. has a new battery and starter(not installed here). vehicle started for us. checked connections @ battery. found both cables slightly loose. tightened positive cable and re...	View
	2002 Oldsmobile Bravada 4.2L rear air ride Customer has complained of bags leaking over a couple of days sitting. Customer came into shop needs it fixed. We tested pump and its working properly. Has no leaks in air bags and lines. The car is in tip top shape and has not been abused. Is there any recall...	View
	1999 Pontiac Firebird 3.8L negative fuel trim Howdy, This fireturd came from a neighbor shop they dropped a boneyard motor in it and then dropped it at our door. We cleaned the injectors and valve ports replaced a "made in china" coil pack that had a poor pattern, fixed a loose ecm connection and reset fu...	View
	2002 Pontiac Grand Am 3.4L all dash lights, i.e... abs, trac, cel this vehicle was brought into our shop with the customer complaining that all the dash "dummy" lights were on and would not go out. the car was driven by us for several days without being able to reprduce the problem. finally on the seventh drive the abs light...	View
	1999 Saturn SL1 1.9L Rear brakes This car has chronic rear brake squeek. It is intermittent but only after some amount of driving. Another shop did the rear brakes twice, they are a Napa service center so presumably with Napas shoes. We inspected it and fount the right rear brake to be the of...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick LeSabre 3.8L temp guage Thanks a lot to every one who responded to my request.After i had replace pig tail on the ect i could still grab wires and make gauge go goofy-so i started stripping back the wire lume to see if i could find the problem and after a little time and effort i fou...	7
	1997 Cadillac Seville 4.6L Blower Motor thanks to everyones replies we replaced the blower motor and it works great...	13
	1999 Cadillac Seville 4.6L Poor Idle Quality, Hesitation, Cuts out, Misfire found number five plug misfiring through side of plug and wires were also bad runs great now as for the trans code customer will drive for now thanks for the help Trouble codes: po300 (random misfire), po741 (torque converter solenoid).	7
	1996 Chevrolet Lumina 3.1L TCC operation After checking the inputs and control for TCC, no definite cause was determined. The customer decided not to authorize further diag at this time. I appreciate all the replies and info I recieved, only wish I had the answer to share with everyone. Thanks again ...	10
	1996 Chevrolet Blazer 4.3L Poor Idle Quality, Poor Fuel Economy Howdy fellers, Well I can finally say that I won't be working on this one for awhile. The owner went to the Fla. Keys on a two month vacation. He did tell me that the cat had been hollowed out, so that is the reason for that code. The vehicle is parke... Trouble codes: P0420 (TWC System low efficiency Bank 1), P01345 (CKPCMP Correlation).	28
	2001 Chevrolet Express 5.0L MIL Lamp on Well this one is going back to the dealer for a reflash of the computer. Hopefully this will straighten out the problem Trouble codes: p0160 (no activeity bank 2 sensor 2).	3
	2002 Chevrolet Silverado 4.8L frt differntial/wheel Hello,The customer chose to drive for a while longer I don't have much more information to add but would like the thank Randy,Brain,Mike, and Brad for your thoughts. Very helpful information about reverse thread bolts.any furture information will let you know....	4
	1995 GMC Pickup 5.0L Poor Idle Quality, Cuts out, Stall The customer finaly told me he just had his timing chain replace and was going to take the vehicle back and have them re-check their work, thank you for everybodys help. Tim from Las vegas.	18
	2002 GMC Sierra 6.6L No Start, Stall, Blows ECM-B fuse Thanks to everyone who responded, special thanks to William [...] for his corrospondance. The fix was to replace the fuel transfer pump. I'm sorry for the delay on closing this request, once I told the owner to just keep the front tank full so he could use... Trouble codes: None (None).	7
	1999 Pontiac Montana 3.4L harsh up shift I believe this vehicle is now fixed. The transmission shop installed an OEM pressure control solenoid. Client has driven it for about a week and a half. It appears to be good. Thanks for the help. Craig	3
	2001 Saturn SL2 1.9L No Start Thank you for your time and effort, After checking powers and grounds @ the pcm and finding other no problems we replaced the pcm with a used unit. We found a shop in the area that was able to reflash the used unit.The car started right up after replacing the ...	7

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