GM Automotive Technicians Technical Discussion and Fixes for Dec 20, 2006

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick Regal 3.1L Stall, Misfire VIN: 2G4WB54T5M Vehicle came in with no idle, and a backfire . We got it to idle long enough to do a propane test. We detected a vaccum leak. We replaced the intake manifold gaskets and replaced spark plugs. Now the vehicle wont start, still backfires. We have preformed a com...	View
	2005 Buick LeSabre Custom 3.8L Pressure control solenoid VIN: 1G4HP52K45 Hi, this one is for a regular customer, so I need what it will take to just fix it, not cya... This car runs a lot of highway miles, cust said it would start shifting hard and illuminate mil. Shut key off, it was back to normal for a while. He took it to the G...	View
	1990 Cadillac DeVille 4.5L Excessive Emissions, No Start VIN: 1G6CD5330L Hello and happy holidays fellow techs. I have this problem child cadillac we inherited from another local shop. They tried a pcm which didn't fix it then towed it to us (it would barely run and was not drivable). I checked spark which is good then fuel pressur...	View
	1994 Chevrolet S10 4.3L 4wd VIN: 1GCDT14WXR this is 1994 truck but it has a 1995 3 button 4wd switch, so i have been using 1995 wiring diagrams, i don't have any codes and when i turn the key on the 2 4wd lights light up and go off but the 2wd light doesn't come on for self test. when i was testing with...	View
	1996 Chevrolet Express 1500 5.0L rear brake lamp VIN: 1GBFG15M8T if the lights are on and the brake is applied, the left rear brake lamp goes out. if the lights arent on then the brake lights work correctly. any ideas would be appreciated. thanks	View
	1996 Chevrolet S10 LS 2.2L Misfire VIN: 1GCCS1946T This vehicle was brought in with No. 4 injector leaking gas. Put No. 4 injector in, was leaking fuel out, so I replaced it. The customer called me a week later, said the truck was missing at idle, and runs down the highway fine. I've checked the fuel pressure ... Trouble codes: P0300	View
	1998 Chevrolet Venture 3.4L radio VIN: 1GNDX03E3W Thanks in advance for the help guys. I had the battery on this Venture disconnected for a couple of days and now the radio reads loc and the cust does not know his pass code. I pulled back up code 142 141 out of the radio and was hoping one of you could give m...	View
	1998 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEK19R9W Original complaint was check engine light on with P0420 (TWC system low effciency below level bank 1). No other codes stored or pending. Performed diagnostic flow chart and confirmed bad catalyst (originial). Replaced converter and all oxygen sensors. Drove ve... Trouble codes: P0153 (Slow Response Bank 2 Sensor 1), P0133 (Slow Response Bank 1 Sensor 1)	View
	1998 Chevrolet Cavalier LS 2.2L starting cold VIN: 1G1JF5242W this vehical has a starting problem when it is cold out in the morning after its been sitting all night.when you go to start it,it will start then shut right off then it may do it again or it may not start at all after about 15-20 tries you can get the vehical...	View
	2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on, engine misses VIN: 1GNDT13W0Y running poor bad engine miss, random miss fire codes, back firing heard in exhaust running like bad distributor	View
	2000 Chevrolet Venture LS 3.4L Hesitation, Cuts out, Stall VIN: 1GNDX03E4X This van is about got me down. It will start cold and run fine. The time it takes to fail varies widely but it does seem to be worse hot. It will cut out almost like a complete ignition shut off very briefly and then back on I even get a battery light to flash...	View
	2005 Chevrolet Silverado 2500 HD 6.6L valve train VIN: 1GCHK23265 Duramax!!! #5 rocker arm bridge fell off! anybody seen this? pushrod not bend. will pull lower valve train cover off tomorrow & check for broken springs, etc. has 204,000 miles on it. new owner bought it 29 days ago. no warranty obviously. rocker arms are adju...	View
	1995 GMC G3500 Vandura 5.7L MIL Lamp on VIN: 1GDJH32K2S hey gent's ,i have this 1995 3500 gmc vandura with a 5.7 liter that has a code 43 knock sensor circuit,one knock sensor,cleared code's ,mil came back on,code 42 knock sensor code came back,test circuit from ecm to knock sensor for short to grnd and for a open ... Trouble codes: 43 (knock sensor circuit), 42 (ignition control circuit)	View
	2002 GMC Sierra 2500 HD 6.0L abs VIN: 1GTHK29UX2 The customer came by our shop a few days ago, and said the ABS is "turning on" just as the truck come to a stop. I test drove the truck and as he said, just before the truck comes to a stop (about 5 mph) the ABS will come on and cause the pedal to vibrate, It ...	View
	1987 Oldsmobile Calais 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, VIBRATION VIN: 1G3NF54L6H Post with FIX!! and Thanks!! This little jewell just about wooped us!The condition is constant under a load and intermitant at idle. after a code/data scan, which revelled nothing of interest. First thing with me and missfires is the vac gauge. The vac was ok...	View
	1993 Pontiac Grand Am SE 2.3L Cuts out, Stall, Misfire VIN: 1G2NE5431P We have this 93 Pontiac Grand Am that will cut out and stall mostly when the engine is cool. Seems to mostly go away when warm. We have checked fuel pressure and volume-ok. Compression tested - ok. Checked injectors - ok. Installed new coils - no change. Clean...	View
	1998 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WP5218W Gents, The fuel pump looses power supply when key is returned to run possition. Came in from another shop, and I'm not so familiar with GM wiring diagrams. The fuel pump runs and PSI is in spec when key is turned on, and cranking,(pump is ok, no codes in any...	View
	1999 Pontiac Grand Prix GT 3.8L Blower Motor VIN: 1G2WP52K0X Hello. I have this car the heater blower motor will only work on hi. Replaced blower motor resistor and it still only blows on hi. Did some more checking and found the a/c light at the button always stays on while on hi, Will go off at lower settings. The comp...	View
	2000 Pontiac Grand Am SE 2.4L Door Locks Door locks on all doors do not lock or unlock either with remote or by switch.Relays all check out ok with tech2.Can hear actuators trying to work.Bcm shows loss of class 2 data communication.Any help appreciated,common on this car?	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Riviera 3.8L supercharger VIN: 1G34BG7W1G thanks to all that replied to my request! i turns out that yes the bearing on the input shaft has failed. i have replaced the supercharger with a new one from gm. this customer must have loved her car. anyway, gm new supercharger was 987.14, and believe it or ...	14
	1991 Chevrolet S10 2.5L Cuts out, Misfire VIN: 1GCCS14A5M OK guys I got a lot of good responses. Some I had already tried some not. In review this little Chevy misfires at 45+ mph only, if will not miss sitting still. Below is a summary of everything tried. 1. spark plugs 2. new wire set 3. distributor cap and rotor ...	27
	1998 Chevrolet Corvette 5.7L Unknown VIN: 1G1YY22G6W most of the replies were about checking for bad bulbs or the incorrect bulb. some were to check that the oil was ok. the cust. had a death in the family so has not brought the car back in for me to check out. when she does i will add what i find if anything th...	12
	1999 Chevrolet K1500 Suburban 5.7L Surge VIN: 3GNFK16R0X Thanks to all who offered help, IATN is probably one of the best tools a tech could have.Looks like David, Vicken, Don & Scott picked out the most important part of the puzzle, the low coolant temp was indeed a T-stat issue and after fixing that it still did i...	9
	2004 Chevrolet Silverado 2500 HD 6.0L oil pressure gauge VIN: 1WHEJ456WR Thanks for all the info guys. Looks like the instrument cluster is going to be the fix on this one. I can't say we replaced it because my neighbor will be trading in the truck. TIME TO BUY A DODGE!!!(LOL) HAHAHA Thanks again to everyone who replied, you guys a...	13
	2001 GMC Sierra 2500 HD SL 6.6L Surge VIN: 1GTHK29131 found out the truck had a Bully dog downloader, removed program and set back to stock, all is good. The only think I was think is that there may be a small problem in the truck and the downloader is amplifying the problem?	3
	1987 Oldsmobile 98 Regency Brougham 3.8L No Start VIN: 1G3CW5136H 15 replies, This was one of those jobs with a giving spirit if you know what I mean. Most all of you agreed that the TPS would cure the no start/idle problem and it did. In regards to the timing chain, The cam does move out on this engine and relies on the cam...	15
	1996 Oldsmobile Cutlass Ciera 3.1L Hesitation VIN: 1G3AJ55M3T Hey Guys, Thanks for all the replys. As I stated in the post I was helping out another tec. on this I finally got back in touch with him to find out what was up.After he did a Inj. ballance test, he found 2 that were bad. Replaced them Car ran better, but not ...	16
	2000 Oldsmobile Intrigue GL 3.5L Poor Idle Quality, hard starting VIN: 1G3WS52H1Y thanks everyone Fuel pressure regulator was leaking, replaced and problem is gone	4
	2000 Oldsmobile Intrigue GLS 3.5L Starting/theft system VIN: 1G3WX52H1Y We worked on this car in between times. Got to the point where it would not run at all. Rechecked everything. REchecked grounds, ok. Rechecked power at data link, ok. Rechecked power at all data lines, ok. This time I could not even get scanner to communicate ...	9
	1997 Pontiac Bonneville SE 3.8L fuse grid keeping power VIN: 1G2HZ52K6V Thanks to all who helped expecially Glen. After looking at all the wiring diagrams from two different sorces I have disconnected all components that are in coralation with both the 5b fuse and the ELC maxi fuse under the hood. When the ELC maxi fuse is disconn...	7
	2001 Pontiac Grand Prix GT 3.8L abs VIN: 1G2WP12K01 Thanks John from Wisconsin & Paul from La. Needed harness#pt1357. Thanks to all that responded.	4

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