GM Automotive Technicians Technical Discussion and Fixes for Mar 21, 2005

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Open Help Requests for GM

	Help Request	Answers
	1986 Buick Century Custom 3.8L 2nd Clutch VIN: 2G2AH19W2G Hello everyone and thanks in advance for the help on this one. This is one of my own. I wanted to put an overdrive in my car so I went to the junkyard to find one that appeared to be rebuilt. Well, I found one that looked freshly rebuilt, but once the pan wa...	View
	2000 Buick LeSabre Custom 3.8L cranks over VIN: 1G4HP54K4Y engine cranks about 5 seconds/starts/stumbles/ then stalls/hit key again start right away and runs fine. leave a little while and problem reoccurs. has good fuel pressure/cooling temperatures are right.	View
	1992 Chevrolet Corsica LT 3.1L Stall VIN: 1G1LT53T7N I now have a 1992 Chevy Corsica on the lot. This vehicle has had a complaint of an intermitant stall. The first few times I test drove the vehicle, I hooked up the scanner and drove and drove. I could not seem to reproduce the complaint. Only one time did it a...	View
	1994 Chevrolet C1500 Suburban Silverado 5.7L abs,ect VIN: 1GNEC16K9R Im working on a 1994 suburban 1500.The problem is that it pulls hard to the right during braking.The suburban has new calipers,brake pads and fairly new brake hoses and 2 new rotors.I did a runout check and it was fine.I also made sure the rear drums were adju...	View
	1995 Chevrolet Tahoe 5.7L Cuts out VIN: 3GNEK18K2S I am posting this Tahoe for another shop. There are no codes but as soon as you begin to give some throttle, the Tahoe begins to cut out and run rough. I put my scanner on it and noticed that as soon as you give some throttle to take off or just sitting in the...	View
	1995 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1GNEC13K1S Vehicle has run poorly since customer purchased approx. 3 wks. ago. Runs for a while before code 44 shows up.When started cold, runs briefly then dies out. Restarts ok, runs rough. Takes a long time to reach closed loop. When in closed loop, runs better(not pe... Trouble codes: 44 (lean exhaust)	View
	1997 Chevrolet K3500 7.4L Hesitation VIN: 1GDJK34J2V truck came in with rust in fuel tanks,flushed rear tank,replaced midship tank with new tank,replaced front fuel pump,flushed fuel lines,replaced fuel rail,all injectors with napa new injectors,now truck hesitates during warm up,scoped ignition system,scanned p...	View
	1997 Chevrolet K2500 Suburban LS 7.4L MIL Lamp on VIN: 3GNGK26J6V Hi group, we got a Chevy suburban 4x4, 7.4 litre engine, idles at 1100 and code p0507(high idle), on my scanner IAC counts is 241 with engine ON as soon as i start IAC counts goes down to 0(ZERO), it has a new IAC motor i checked intake manifold for vaccum lea... Trouble codes: P0507	View
	1999 Chevrolet KODIAC 7.2L park brake alarm module VIN: C7XJ105931 Started with park brake alarm going off.Had moisture in system, so we flushed system.All ok for 2 days and alarm lights off again.Noticed excessive travel on actuator cable,replaced and adjusted park brake shoes.Once again, ok for a day or two.Since then the p...	View
	2000 Chevrolet Impala 3.4L No Start, Stall VIN: 2G1WF55E5Y the following this is for all of the tech 2 users. along with the b1626 no other problems could be found. checking the systems with the tech ii found this courious item. under bcm data/security there is a listing as follows, lockout timer status 2550 sec, auto... Trouble codes: U1000 (class two data link malfunction), U1016 (class two data link malfunction), U1255 (class two data link malfunction)	View
	2003 Chevrolet Impala 3.4L Air Bag Light VIN: 2G1WF52E23 trying to determine why air bag light is on scanner says deployment commanded. And also that it has lost communication with module?	View
	2004 Chevrolet Silverado 2500 LS 6.0L Alignment VIN: 1GCGK23U84 I have exhausted my resources on whether or not I need a Tech 2 to do a 4 wheel alignment on a GM quadrasteer vehicle. Can I enter the "alignment mode" with my OTC Genesis? I'm trying to figure this out before I have one waiting on the rack. Thanks Kevin	View
	2001 GMC Yukon XL 2500 SLE 6.0L Master Cyl / ABS VIN: 3GKGC26U91 I can sure use some help with this brake problem. With the engine and key off the brake pedal will go all the way to the floor (bottom-out). Key on engine off the brake pedal does the same when pressed, it will go all the way to the floor. Turn the engine on a...	View
	1989 Oldsmobile Cutlass Calais SL 2.5L Cuts out, Stall VIN: 1G3NT54U0K The customer's complaint is stalling when cold, starts right back up again. Usually before the end of the driveway. While testing, I thought it would be a good idea to scope the (EI system) coil primary current. Build time is about right @ 3.1ms, current limit...	View
	1999 Oldsmobile Alero GL 3.4L steering pump VIN: 1G3ML52E4X We have a 1999 Olds Alereo. It came in with a loud PS pump noise, like running with no fluid. we replaced the pump with a new one but we still have the noise, It may be a little quieter but still there. We had flushed the system and bled the air out. There are...	View
	2001 Pontiac Montana 3.4L 4th gear VIN: 1GMDX03E71 Hi guys, rebuilt trans for no 3rd or 4th gear found 3rd clutch worn smooth. Replaced all seals,frictions, and steels and 1-2 & 3-4 shift solenoids - 1-2 ohmed out at 125 ohms and 3-4 just because I did not want to go back into this trans.Also when I try to tes...	View
	2001 Pontiac Grand Am GT 3.4L starting VIN: 1G2NW12E71 Car cranks but no start and the Security light flashes car has no codes when scanned at times car will die while driving and the security light will flash and no start until light quits flashing	View
	2003 Saturn Ion-3 2.2L Poor Idle Quality, Misfire VIN: 1G8AL52F83 vehicle came in for a surging problem and idle quality. when ever you start the vehcile it idles rough and apperers to have a misfire. we checked for vacuum leaks, none found, check the map sensor and iat sensor and both are good. we are stumped and can't figu...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y5V found fuel system running lean, replaced oxygen sensors and no more problems, thanks for your help. Trouble codes: P1599.	4
	1984 Chevrolet Corvette 5.7L no shut off VIN: 1G1AY0784E Among the other 4 or 5 problems with this car, the fuel pump relay can also get power from the oil pressure switch circuit. This car was running on power from the oil pressure circuit, and it had a bad sending unit. Once the switch was replaced, and the circui...	24
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13WS2 Thank you for your time all of you i have to close: my time is expire.By replacing fuel pump & another pcm still no injector pulse.	11
	1997 Chevrolet Blazer 4.3L No Start VIN: 1GNCT18W2V Thanks to all of you who gave advice. I did get lost in a forest with the loss of data on my scanner while cranking the Blazer, that apears to be normal. Fixing cars is a skill that needs to be practiced everyday or it will atrify. I found that I was jumping... Trouble codes: P0338 (Crankshaft position sensor circuit high frequency).	11
	1999 Chevrolet Malibu 3.1L overflow resevior VIN: 1G1ND52J6X Hello guys, Sorry the close took so long. The student was in no hurry to spend the money for the enivitable...the head gasket was indeed leaking just like the facts and 9 out of 10 of your replies pointed to. You all nailed it right on the head. Thanks to ...	22
	1999 Chevrolet Venture 3.4L pass key VIN: 1GNDX03E5X The vehicle partially fixed itself. The pass key light was ready to be taken to a dealer to have checked by the customer. When I went to pick her up, the light was off and never turned back on. I was informed that if this was a PKIII set up, it would need to b...	8
	2000 Chevrolet Venture 3.4L high idle VIN: 1GNDX03E5Y after reading possible causes I looked at tps and there I found the problem, replaced tps and problem was solved thanks iATN	7
	2000 Chevrolet Blazer LS 4.3L trans VIN: 1GNDT13W8Y FOUND IT. In my rush to pull it apart and find a roller clutch failure, I over looked the band where the holding lug goes in. It sheared the round hole on the band the lug goes in. The band was draging on the drum causing the binding I was feeling, and the loo...	7
	2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1950Y Thanks for all the help, vehicle has bad fcs sensor, vehicle from used car lot and is going to be sold as is - Trouble codes: P0178 (No info), P0179, P0141.	7
	2000 Chevrolet Silverado 1500 4.3L engine VIN: 1GCEC14WYE thanks everyone for all your help.I ended up pulling the right side head off the truck and found that the tech that did the job origanally,dropped one of the dist. cap bolts down into the intake passage.he apparently didn't notice the screw missing since he re...	14
	2000 Chevrolet Cavalier 2.2L Keyless entry VIN: 3G1JC5246Y Thanks for the input on this one. I tried disconecting the BCM for a while and pluged it back in and still had the same problem. I hooked up my lab scope to see the signals coming out of the BCM. I had no signal when I pressed the lock button but the signal wh...	7
	2001 Chevrolet Express 2500 4.3L blower fan Hello Fellow Techs, no joy on this one yet-vehicle comes in every two days like clockwork. Service manager told them to take it to the local electrical shop and see if they have any ideas. We checked it every time it came in and found no problems when in shop-...	4
	2003 Chevrolet Corvette Z06 5.7L No Start VIN: 1G1YY12S53 Thanks for all who replied...I found the fault about 2 hours after this post..turns out the passenger side power door module failed causing a communication problem with all modules(no comm) and subsequently all the problems listed. I ordered a new one from the...	3
	1999 GMC Yukon Denali 5.7L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GKEC13R0X Hi there, I fired up the vehicle and it ran fine when cold. When it warmed up there was a missfire high up. I then changed the Crank Angle Sensor as when the oil pan was removed by the previous workshop to gain access to the oil pump I suspected they may hav... Trouble codes: P0339 (Crankshaft Position Sensor Circuit Intermittent), P0340 (Camshaft Position Sensor Circuit).	17
	1992 Oldsmobile Cutlass Ciera S 3.3L Idle VIN: 1G3AJ84N4N Thanks guys for all the replies. Gerry [...] were right on the money. Because I got the air filter boot off hot air pushes through the MAF , that makes it to go crazy. After I put back the boot from the throtlle body take it for a test drive...	7
	2000 Oldsmobile Alero GX 2.4L engine VIN: 1G3NK52T1Y Thank you all for your help on the Alero. The problem was a cracked flexplate at the mounting bolts as one of you stated. We had to pull the transmission and replace the flexplate. It took care of the problem. Thanks again for all your input.	5
	1995 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire, kick-back/detonation VIN: 1G2NE55D9S Well Guy's,thanks for All the help, it turned out to be the large plastic coil-holder: thats where the spark gets distributed to the proper plug{s},well evidently the spark was going to the path of least resistance trying to fire some cyl's real early in the c... Trouble codes: N/A.	9
	1997 Pontiac Sunfire SE 2.2L cooling VIN: 3G2JB124VS As far as i know this is fixed, after replacing thermostate 4 times and back flush heater core and radiator. I'm am going to the lay the blame on crappy thermostate. 3 NAPA thermostate and one dealer. I cannot be 100% sure because we flush it at the same time....	15
	2002 Saturn L200 2.2L Misfire, MIL Lamp on VIN: 1G8JU54FX2 An injector fixed this car. I learned a lot about how little I knew. This system doesn't use the missfire detection that I'm familiar with. To go into details here about how it works would make a long post. Many thanks to Rusty [...] for his input and for r... Trouble codes: P0303 (Misfire cylinder 3).	6

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