GM Automotive Technicians Technical Discussion and Fixes for Jun 21, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick Regal Custom 3.1L Coolant temp guage VIN: 2G4WB55M6R I have a buick regal that the temp guage reads too high. it reads 260F when the engine is only at 220f. I have replaced the sending unit and checked the wires (power, ground, and signal) going to the instrument cluster. After hooking up a variable resister s...	View
	1997 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G4HP52K9V the vehicle runs but pings when it gets hot, and has no real power. it misses sometimes. when the code was cleared it would stay off for a while but would come back on after sitting for a while, either way the light comes and goes after each repair and after a...	View
	2002 Buick Rendezvous CX 3.4L possible abs module VIN: 3G5DA03EX2 This van originally came in for an abs and traction light on and occasional abs activationon on dry pavement. There was a code for a left front speed sensor. Testing showed both front sensors shorted to ground, so both sensors were replaced. Later the van retu...	View
	1990 Cadillac Eldorado 4.5L no power VIN: 1G6KS533LU vehicle has no power...boggs on acceleration..no codes	View
	1924 Chevrolet NATIONAL 2.0L king pins VIN: OXGAB12499 Hi world tech`s I have a 1924 Chevolet National Convertable for a safety inspection . this car is right hand steer & was made in South Afica . I`m looking for a source for king pins & info on whether the wheel bearing grease caps pull off or twist off . the m...	View
	1989 Chevrolet Corvette 5.7L fan VIN: 1G1YY2180K i can not get the fan (radiator cooling fan)to run with the compressor,relay is fine,pcm is new (reman)the fan does run with engine temp.at 220, and cycles fine, but with a/c on the fan will not contimue to run while the compressor is running, high pressure on...	View
	1989 Chevrolet R2500 Suburban Scottsdale 7.4L Poor Idle Quality, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1GNGR26NXK Hello ppl. This burban has us stumped. Customer complaint was lack of fuel economy and occasional check engine light. codes for lean exhaust and obvious lean condition lead us to bad intake gasket and throttle body spacer gasket. both of which we replaced. Rep... Trouble codes: 44 (exhaust lean)	View
	1989 Chevrolet Corsica 2.0L torque converter VIN: 1G1LT5411K Hello to all...am just seeking an opinion on this matter. A long time customer brings her Corsica to me and asks me to replace the transmission. I do a test drive and the tranny has a slight slip from 2-3, not that bad though for the mileage. The other problem...	View
	1989 Chevrolet Beretta 2.8L Poor Idle Quality, Stall, Misfire, Poor Fuel Economy VIN: IMCVDE22H9 this is my sister-in-laws car she wants it fixed but im at a loss they have had alot of work doneand 3 other shops tell her there is nothing wrong with her car but there is when it warms it begins to chug then if you roll up to a stop sign it will quit at the ...	View
	2000 Chevrolet Silverado 2500 6.0L Driveline? VIN: 1GCHK29U62 Customer complains of a "trailering" feel when driving at speeds over 50 mph. He first noticed the condition approx a year ago and it hasn't gotten worse, about the same since then. Test driven and symptom reproduced. Intermittent low frequency "shudder" fro...	View
	2002 Chevrolet Suburban 1500 LS 5.3L a/c drive belt VIN: 1GNEC16ZX2 Hello and thank anyone in advance for your help in this matter. I have a 2002 chevy suburban with a 5.3l engine breaking a/c belts in half for no apparent reason. These belts have been diff. brands and the tensioner has been replaced after noticing minor probl...	View
	1993 GMC C1500 Sierra SLE 4.3L inter. shift from first VIN: 2GTEC19Z9P customer stated that when brake warning light is on veh. will not shift. when light goes out veh. would shift. on road test found with scanner no veh. speed from vss and speedometer not moving. tested vss and foud it giving no signal and replaced it. Still veh...	View
	2000 GMC c6500 7.4L park brake VIN: 1GDJ7H1D5Y This truck has the service park brake light on.What I really want is to find a source for info on this brake system.I checked Helm on the internet,they don't show a shop manual for this truck. Does anyone have a book that covers this park brake system that you...	View
	2002 GMC Savana 3500 5.7L Mechanical VIN: 1GTHG35R32 This vehicle has a miss under heavy load up hill , MIL will flash and go off P0300, you cant even hardly feel the miss, which we originally thought was an ignition problem. But now we are getting low oil pressure in my opinion, its in spec per Gm but at idle i...	View
	2001 Oldsmobile Alero GLS 3.4L ride control VIN: 1G3NF52E91 When turned to the right all the way going forward or backward something pops once which feels like it is coming from the right side. I have two other alero cars the same year doing the same thing, except the others can be turned right or left all the way and ...	View
	1999 Pontiac Grand Am SE 3.4L all gauges and power acc. VIN: 1G2NE52EXX On initial start up the gauges will not work and the power accessories such as windows and locks will not work. May only happen once or twice a day, and all will start to function 5-10 seconds after start up. I have seen many ignition switches fail with simila...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Cadillac DeVille 4.9L level control VIN: 1G6KD52B7S Thank you for your input guys. I replaced the pump assembly and the system is working fine. Thanks again, Jim	7
	1997 Cadillac Catera 3.0L antitheft VIN: WO6VR52R8V I would like to thank the members who took time to give me some suggestions on this one, although the info I got wasnt what I was looking for, probably because these Cateras are not very common. I posted this mainly to find out where I get the 4 digit code. Mo...	5
	2000 Cadillac Catera 3.0L Brake Pad Sensor VIN: W06VR54R9Y Hi there, Brian from NC is correct. As some of you may know, this vehicle is not really a Caddy nor was it built in the USA. It is mostly a german Opel and the brake sensor circuit is similar to BMW and Mercedes Benz. I tried Mitchell but they said use 100...	5
	1989 Chevrolet C1500 Cheyenne 5.7L No Start found two problems, one was a bad ign. module, the second was a short in the power wire to the ecm. thanks everyone!	8
	1991 Chevrolet Lumina 3.1L Poor Idle Quality, Surge, MIL Lamp on, idles very high VIN: 2G1WN51TXM Vehicle fix ended up to be a shorted wire to the iac motor under the intake plenum. It was found by tugging on the harness to the ps pump side of plenum and the vehicle returned to base idle. mil went out and vehicle ran and started great. Thanks to all your a... Trouble codes: 35 (IAC problem), 44 (Lean exhaust).	8
	1993 Chevrolet K1500 Cheyenne 6.2L Excessive Emissions VIN: 2GCEK19CXP thank you in to all that replied i was checking diesel pressure and the primary pump quit, put new one and set pump timing to the line it ran fine before it would smoke like crazy my guess pressura was low, i than bought snap on diesel timing adaptor and set i...	4
	1999 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Cuts out, Stall VIN: 2G1WL52M8X It was the crank sensor. Even though it tested good it was one of the first things we replaced. I decided to changed it again, both AC Delco, this time vehicle wouldn't start. Put third AC Delco sensor on ran like a top. Don't we love new out of the box defect...	9
	2001 Geo Prism 1.8L Hesitation VIN: 1Y1SK52881 The fix was the updated MAF sensor. ( Toyota calls it an intake air flow meter I think ) The symptom was a tip in hesitation, EXACTLY like an old carb engine with a bad accel. pump. 99% of you guys said that, many thanks.	7
	1995 Pontiac Bonneville SE 3.8L oil pressure VIN: 1G2HX52K3S Thanks to every one who replied, I wish I could enlighten every one with a miracle cure that fixed the ailing Bonneville but unfortunately that wasn't the case. We'll chalk this one up to 'luck of the draw.' The last engine we put in we dropped the oil pan on ...	17
	2001 Saturn L200 2.2L Excessive Emissions VIN: 1G8JU52F61 It took me some time to finish as the customer was trying to get saturn to do it for free but they didnt, so I got to do the job . Well its fixed I figured the timing chain was probably not right, but not sure, a few replies suggested I was right, unfortunatly... Trouble codes: P0172 (fuel system too rich bank1).	7

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