GM Automotive Technicians Technical Discussion and Fixes for Jul 5, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick LeSabre Custom 3.8L 60 amp ignition fuse VIN: 1G4HP52K4W Looking for any help on this Buick. Customer can drive vehicle for 2-3 weeks before problem occurs. Shuts vehicle off and when they come back to start it, the minute the key is turned off it blows the #2 60 amp maxi fuse for the igniton system in the power dis...	View
	2003 Buick Rendezvous CX 3.4L No Start, Stall VIN: 3G5DB03E03 We have a problem only when A/C is on.With the A/C on we lose pressure and vehicle stalls.It does not happen every time.No codes found.A/C system is working fine,no diagrams and vehicle is out of warranty.Help.Thanks for your time.	View
	1984 Cadillac Eldorado 4.1L Poor Idle Quality, Sluggish, won't rev VIN: 1G6AL5783E Hi Group, This Caddy is a challenge today. It idles poorly and will not rev above 2000-2500 rpm at all, and it is slow to rev up to that. No codes, fuel press. & Vol. in spec, Fuel filter is new, Ign. timing was right on without me touching it. Engine vacuum...	View
	1995 Chevrolet K1500 5.7L Poor Idle Quality, Hesitation, Stall VIN: 2GCEK19K7S customer's concern was "dogging on accel, like trying to pass a kidney stone". check dynamic compression and find it very low. removed the intake and found excessive carbon build up on the intake valves. cleaned and reinstalled intake, no change, except now th...	View
	1995 Chevrolet Lumina APV 3.1L Fuel pump VIN: 1GNDU6ORT1 this van is making me go nuts. keep blwing the fuel pump fuse. it will run for a while then blow or somtimes it wont blow at all. Vech was in for oil leaks and another tech in the shop repaired oil leaks and shampoo. cust came back on a hook. Found fuel pumpo ...	View
	1998 Chevrolet Lumina 3.1L A/c fan speeds VIN: 2G1WL52M2W elec.speedo is inop., unless a/c fan speed is awitched to "high", then speedo needle acts like a Tach, and odometer starts rolling as if traveling at high rate of speed. As indicated, changed speed sensor at tranny, and speedo cluster, no change in syptoms. Ra...	View
	2001 Chevrolet Malibu 3.1L Surge VIN: 1G1ND52J61 Hello all, this vehicle came to us after the dealer performed a tune up and fuel injection service. The customers complaint is a rpm surge of around 300 rpm when cruising. When I test drove the vehicle I was going 75 mph, when I excel very slightly, not enough...	View
	2001 Chevrolet Express 3500 5.7L Compressor VIN: 1GBJG31R82 Van came in for A/c inop. I show no request parameter in data stream. Followed flow chart for compressor does not engage. Verified static charge. Tried control head for proper operation of vent control. Bypassed high pressure switch. It then wanted to test con...	View
	2001 Chevrolet Venture LS 3.4L turn signals cruise brake lamps VIN: 1GNDX03E51 with lights off turn signal dash lamps stay on cruise kicks off when you turn rh signal and one flashes with signal on with lights on cuise inop on brake makes dash turn signals light up brighter lh trun no flash rh dash light goes off replaced multifuncion sw...	View
	1999 GMC K1500 Suburban SLE 5.7L Misfire, MIL Lamp on VIN: 1GKFK16R5X Hi Folks, Hoping to get some input on a Suburban that I bought in AZ. It ran fine when I was there but after sitting for a month{was started every so often}my driver who was bringing it back to NH for me called and said cel was on. It had a #5 cyl misfire cod... Trouble codes: P0300	View
	2000 GMC Jimmy Diamond Edition 4.3L four wheel drive VIN: 1GKDT13W2Y Customer came in with the complant of the four wheel drive lights on the dash where flashen and the service four wheel drive light came on.Scanned car found a code u1026 (no communication on the class 2 data line)Checked the fuses all ok.Checked for grounds al...	View
	1995 Oldsmobile Aurora 4.0L Accessories VIN: 1G3GR62C6S I have a strange one here, when you turn on the lights or use any electrical items you get a beeping noise from the dash. I have checked the alternator and battery for any concerns but both seem ok. This car has a message center but everything is ok so I don't...	View
	1997 Oldsmobile Aurora 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G3GR62C1V Hey gang, greetings to all. I need some help on this one.Car has a misfire on cylinders 5 & 7.I can see the misfire monitor rapidly climb at idle on my modis for cylinders 5 & 7.I proceeded to checked to ck ignition;plugs ,wires,coils.Low k.v. output on cyl. 5... Trouble codes: 300 (multiple misfire), 305 (307 -), 307	View
	1987 Pontiac Fiero SE 2.5L Poor Idle Quality, Hesitation, Surge, Stall, Poor Fuel Economy VIN: 1G2PF11ROH We inherited this problem vehicle after no one else in town could repair it. We got it with a bad engine and we installed the Jasper. Problem is surging and all speeds. The O2 stays rich, pulse width goes to .9ms at idle and only about 1.1ms when reving engine... Trouble codes: 45 (rich exhaust)	View
	1993 Pontiac Firebird Formula 5.7L engine VIN: 2G2FV22P5P He said it has been running a little hotter than usual and at idle it would boil out. The coolant looked good but it has been 2 years since his last flush so we flushed the coolant, installed a new OEM thermostat and a new CTS. When it idles it will start to o...	View
	1995 Pontiac Bonneville SE 3.8L engine VIN: 1G2HX52K5S vehicle came in with blown head gaskets, leaking intake manifold [glycol going into crankcase]. We fixed these,it ran great for 20 minutes, then it started this "chirping" noise. The only noise I have ever heard like it is just before an engine seizes-up from ...	View
	1995 Pontiac Grand Am SE 3.1L Mechanical VIN: 1G2NE55M6S Hello again everyone. I have this Pontiac that my niece just bought from a local car lot. the car has alot of miles on it and she has had it for about 1 week. the owner of the lot brought me the car stating that it was making a noise and was blowing black smok...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Riviera 3.8L MIL Lamp on VIN: 1G4GD2216V thanks to every one who responded like the very next day, many of you said replace ecm with factory one which we were headed in same direction, decided to trace pinpoint test oe more time, ended up finding a broken wire ( still a few strands connected) from mo...	6
	2001 Buick Regal LS 3.8L Magnasteer VIN: 2G4WB55K21 Well… it is fixed. A new AC Delco rack did it. This is what I learned. The video listed in the TSB, I did buy it. Not bad. Only it did not cover Magnasteer. It did talk about a Kent-Moore power steering tester. Pretty cool. That tool will help. (I didn't b...	4
	1997 Cadillac Eldorado 4.6L unsure VIN: 1GGEL12Y4V customer called me back to get the update on what i found out from you guys. said he could not believe that starter was located under the intake and would take back to where he bought to 'jump' on guy who sold him such a poorly designed vehicle. said he may be...	11
	1924 Chevrolet NATIONAL 2.0L king pins VIN: OXGAB12499 thanks for quick replies I located a set of king pins from the filling station in oregon w.w.w fillingstation.com . a set of king pins $75. us . can`t get them made for that price . I had 10 replies in total the other sources suggested didn`t have parts th...	10
	1985 Chevrolet K10 Scottsdale 5.7L Surge VIN: 1GCEK14LOF Got a lot of good information and ideas for possible repair of the pinging and surge issue. The owner cannot bring the truck in for a while which is fine at this time. Gives me a chance to organize a plan of attack when it does. Some of the recommendations wer...	26
	1999 Chevrolet Silverado 1500 5.3L a/c belt VIN: 2GCEK19TH1 thank you one and all. the fix was to replace the compressor. i did check the calibration id and it was the most current one so i talked to customer about the compressor and they agreed to replace it and it works just fine now. thanks again for all of your hel...	28
	1999 Chevrolet Tahoe LS 5.7L shifter VIN: 1GNEK13R4X Everyone was right. It was the cable. Now that I know, I have to fix several other customer's as they come in. Once again IATN has proven it is worth every penny.	5
	1999 Chevrolet S10 4.3L serv. 4x4 VIN: 1GM2NDCVKX thanks for replys , customer has not returned for futher testing. mabey its ok, or mabey customer is just ignoring service 4x4 light , i will update with any news.	3
	1992 GMC K1500 Sierra 5.7L Hesitation, Misfire VIN: 1GTEK14K3N well almost everybody said replace the egr valve so i did and it runs great I was not aware that they were regulated internally. That explains why it stumbled. Thanks to everyone you all gave great advice	29
	1993 GMC C1500 Sierra SLE 4.3L inter. shift from first VIN: 2GTEC19Z9P replacing the vss and the buffer was only half the problem. These two Items were shorted out from a faulty wire and fuse connection at the interior fuse panel at the brake fuse. After repairing the wire and the fuse connection everything started to operate pro...	4
	1998 GMC Savana 3500 5.7L Poor Fuel Economy, power loss VIN: 1GDHG31R6W Hello and thanks to everyone who responded to my help request. I don't know what has happened to my customer, his phone wouldn't answer, and since it has been disconnected. It seems he has fell off the face of the earth, the van is just sitting in his parking ...	8
	1998 GMC K1500 Sierra SL 5.7L Differential VIN: 2GTEK19R6W Finished this truck last friday,have to say I like this fix, the 14 bolt diff is beefy and looks like it will last. The diff drops right in, springs line up with pads and stock wheels fit,width is the same so tires are in the stock location,we used a u-joint f...	4
	2004 GMC Sierra 2500 6.0L cooling system VIN: 1GTGK23U64 we replaced the radiator and it repaired the problem. i want to thank everyone with their replies, this forum is great.	15
	2003 Hummer H2 6.0L air inlet door inop VIN: 5GRGN23U63 i had to ship car to the dealer due to the extended warranty. they said that a new recirc door acctuator motor fixed the problem. but i do not beleive them since i had put two on this truck. could have been i got defective parts but i will never know. thanks t...	2
	1965 Oldsmobile Cutlass 400CID Hesitation VIN: 338675M230 Thank you for all of your replies. A few of you thought I was talking about a quadrajet, but this was a Rochester 4Jet Carb. It's a totally different animal. After taking this beast apart at least 5 times, I never completely resolved the hesitation. Warm it is...	21
	1998 Oldsmobile Intrigue GL 3.8L radiator fans VIN: 1G3WS52KXW Thanks for the replies. After searching for wiring problems with this one we finally found corroded wiring in the harness that wraps around the battery. The funny thing is there was continuity in the wires going to the relays from ECM..?? I guess since there a...	5
	2002 Pontiac Grand Am SE1 3.4L anti theft system VIN: 1G2NF52F92 I got 3 replies all greatly appreciated. One said to perform the relearn for 40 minutes, 10 minutes at a time. I did this but still could not get thelight out. The other relies had experienced water in the bcm and had to replace it, and one had a instrument cl...	3
	1997 Saturn SL1 1.9L a/c VIN: 1G8ZH5281V thanks to everyone who responded. dealer fan belt cured the problem thanks again. steve	10

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