GM Automotive Technicians Technical Discussion and Fixes for Oct 18, 2007

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	Help Request	Answers
	1992 Buick LeSabre Limited 3.8L Battery Draw VIN: 1G4HR53LXN Vehicle has severe draw on batery, 12.5 volts, narrowed it down to Fuse #11 which controls the following. Oil Life Module, Information Center (does not have? ultra model only?) HVAC Programmer, Oil Level Module, Multi Function Chime, HVAC Control Assm, Twiligh...	View
	1999 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K1X I have a 3.8 with multiple cylinder missfires #3 #6 cylinder miss at same time I have tried replacing the coil and module with known good wires and plugs are new and look ok what I want to know is there something related to these two cylinders (cam sync or cra... Trouble codes: P0300	View
	1999 Buick Regal LS 3.8L 1-2 shift VIN: 2G4WB52K7X hI guys I have a 4t65e trans. blues. Has a 1-2 shudder med to heavy throttle. light throttle don't seem to notice. the trans has been recently rebuilt by our shop and someone had been in there before. the unit was tore up pretty good and we did have to replace...	View
	1992 Cadillac DeVille 4.9L starter VIN: 1G6CD53BXN Hello. I have a cadillac with a no start.all fuses good.voltage present at the starter main wire.No voltage however to turn the solenoid on at crank. i have so far traced the wires from ignition switch all the way to the neutral or gear select switch. the star...	View
	1996 Cadillac Eldorado ETC 4.6L Theft Lock VIN: 1G6ET1295T I have a 1996 caddy that will crank but not start,the IPC sets a B2750 Pass Key data communication failure,and the PCM sets a P1631 Password not correct.Have tested the resistor in the key at 1.5k and tested the two little wires at the base of the colum to see...	View
	1989 Chevrolet G10 Chevy Van 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy VIN: 1GCDG15H9K Alright I have run out of ideas on this van. I bought this van to use as a service vehicle. It has been sitting for two to three years. I put a batterry in in and it started after a few cranks, but ran very poorly, as expected. It only had a few gallons of fue... Trouble codes: 45 (o2 sensor rich)	View
	2001 Chevrolet Astro 4.3L No Start, VIN: 1G1NL345RW Vehicle ran fine for about a week. then started running poorly. MIL light came on with a code for MAF sensor. upon testing, we replaced the sensor. The van has never started since. It seems to want too. I pulled the plugs out and they are washed with fuel. ple...	View
	2001 Chevrolet Prizm 1.8L Lacks Power VIN: 1Y1SK52861 Morning everyone. What we have here is a 2001 Chevy Prizm is giving us some troubles. It started out having a very high idle and had a bad misfire. Changed all 4 plugs and performed BG Fuel Induction Service. Car idles perfect and has no miss. But the problem ...	View
	2002 Chevrolet Astro LS 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNEL19X12 #4 cylinder counts up on mis-fire counter, mis-fire diminishes at part throttle and under load. air checked cylinder for leakage. has some leakage. Trouble codes: P0300 (random mis-fire)	View
	2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G1JC12452 This job was not my idea but it has to be repaired.Engine was swapped out due to previous engine seizing.Used motor did not come with PCM so supposed to reuse the existing PCM.All seems to be well mechanically after replacement, car will start and idle fairly ... Trouble codes: P0122 (Tps low voltage)	View
	2002 Chevrolet Suburban 1500 LT 5.3L a/c compressor VIN: 1GNFK16Z02 with automatic temp control set to lowest temperature intermittantly the a/c compressor drops out and the light on the a/c button blinks. have replaced the main control assembly, does this need reprogrammimg? the vehicle does have rear air.	View
	2003 Chevrolet Astro 4.3L Hesitation, Surge, Misfire, MIL Lamp on, LACKS POWER VIN: 1GNEL19X23 hi all, looking for some answers, 2003 cheverlet astro awd. codes p0101 and p0300, seem to be related, had some abs codes too ,no results, cleared abs and engine codes, still clear after several drives. concern is lack of power. goes fine on the flat. up to 65... Trouble codes: P0101 (maf performance), P0300 (rendom missfire), C0221 (rf speed sensor open), C0223 (rf erratic sig), C0227 (lf erratic sig)	View
	2003 Chevrolet Silverado 2500 HD 6.6L Hesitation, Surge, Cuts out, Stall VIN: 1GCHK24133 This truck will stumble and sometimes die undear load conditions and sometimes at cruising speeds.Not consistantly. some days it will do it constantly other timws it will only do it once per trip. I watched the actuall fuel rail pressure vs. the desired fuel r...	View
	2003 Chevrolet Silverado 2500 6.0L reverse VIN: 1GCHK29U43 when trans temp getts above 250 degrees and put in reverse the vehical will shut off. there are no codes. i'm not much of a tranmission person but i need to fix this one.	View
	2003 Chevrolet Cab & Chassis Silverado 3500 6.0L no fuel hey guys a little help please.this chevy was towed in on the hook. no start condition .it it is a dual tank system .fuel gauge reading full.no fuel pressure on gauge.good power and ground at pump . removed primary sending unit. only to find an empty tank!rear ...	View
	2003 Chevrolet Silverado 3500 6.6L Hesitation, Engine Noise This Duramax Came in with a "smoking" and "knocking" complaint. Scan tested and found P1093 "Fuel Rail Sensor" code. Engine also has a very noticeable knocking noise in the engine, not a fuel knock but a mechanical knock at idle and while driving, if i remove ... Trouble codes: P1093 (Fuel Rail Pressure)	View
	1995 GMC C3500 Sierra SL 6.5L Surge VIN: 1GTHC39F8S hey guys this truck came in with a bad surge at idle lightly touch accelerator pedal and rpm goes crazy same when driving from a stop lightly on acc pedal it will take off like you floored it and keep pedal at 1/4 throttle and it will keep acc like your at 1/2... Trouble codes: 35 (inj pulse width error short response)	View
	1996 GMC Yukon SL 5.7L willnot disengauge 4wd VIN: 1GEKEK13R2 removed for overhaul of tranny replaced transfercase plugged enguagement motor with key off it started lock in and out of 4wd turned key on stops running 4lo light in dash lit up mash 2wd button it flashes 2wd lite goes off and 4lo lite flashes.was in 2wd when...	View
	2001 GMC Sierra 3500 SL 6.6L air in front calipers VIN: 1GDJC34171 Vehicle is continualy building up air in front brakes.Every week brakes have to be bled no sign of visable leaks.	View
	2003 GMC Sierra 1500 5.3L Hesitation, Misfire VIN: 1GTEK14X3Z this truck came in with the trouble code p0300, cylinder 2,4,6,8 all showed misfires when cold, after the truck runs alittle the miss clears up. bank 2 sensor 1 o2 senser read 1107 when first started then starts reading normal. after senor read truck runs grea... Trouble codes: P0300	View
	1996 Oldsmobile Cutlass Ciera 3.1L poor accelleration VIN: 1G3AJ55M3T Customer complained that car would not go when he pushed gas pedal. Code P0300 stored in computer. Compression and vacuum OK. I removed the O2 sensor, car ran MUCH better. Reinstalled O2 sensor and replaced clogged cat converter. Car accellerates better, but n... Trouble codes: P0300 (Random missfire)	View
	1999 Oldsmobile Alero GLS 3.4L No Start, Poor Idle Quality, Stall VIN: 1G3NF12E0X This car has a whole host of symptoms that occur intermittently. At times it won't start, or dies when running. Sometimes it idles normally, other times it idles above 2500 rpm. It had a whole list of codes when we first got it in, and the ones I listed return... Trouble codes: P0122 (TP or APP Sensor 1 Circuit Short/Low), P0123 (TP or APP Sensor 1 Circuit Open/High), P1121 (TP Circuit Intermittent High Voltage), P1122 (TP Circuit Intermittent Low Voltage), P1626 (Anti-theft System Fuel Enable Circuit)	View
	2002 Oldsmobile Silhouette Premiere 3.4L Wireless Headphones VIN: 1GHDX13E12 I hope some one else has run into this problem or can shed some light on it. The radio and entertainment system on this vehicle works fine except for the wireless headphones. You get no sound out of the headphones unless you put them right up to the infared se...	View
	1994 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX52L5R Hello all,I have a 1994 (06/94)Bonneville that was an intermittent start and die but runs well when it stayed running.It now just starts and dies,I lose the gound side control of the injectors when it dies,pretty much immediatley when you let off the key from ... Trouble codes: 626 (Pass key frequency incorrect.)	View
	2002 Pontiac Sunfire SE 2.2L overheating VIN: 1G2JB52452 the car came in with an overheating problem.i have replaced the head gasket due to leakage the vehicle is still over heating. the thermostat@radiator have also been replaced. the waterpump was removed and inspected and looks good.after about 2to3 miles of driv...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2005 Buick Allure CX 3.8L "gurgling"hello VIN: 2G4WF53295 on this vehicle we took every bodies advice that replied. we flushed the heater core then we switched the intake and out put hose at the core . then we vaccumed the cooling system and refilled .next we allowed the system to bleed with the front of the vehicl...	6
	1997 Cadillac Seville SLS 4.6L fuel gauge VIN: 1G6KS52Y0V Well I want to thank all that responded to my request. Everyone was right on the money. Most offered a way to test the sensor in the tank and we did apply that theory. Yep! we had a old gauge tester with built in resistors that we can adjust, and we used that....	7
	2001 Cadillac DeVille 4.6L Suspension VIN: 1G6KD54Y61 I returned car back to customer a week ago and have not heard from her. I dont think it is fixed although. I wish I could have listed better news. I am not prepared to ride in the trunk again. Thanks again for all the suggestions.	7
	1986 Chevrolet K30 Custom 6.2L tachometer VIN: 1986CUCV62 thanks everyone for all your info I was as always what i was looking for I'm just going to go out and buy a new tach so i dont have any problems and hook up to the injector line	12
	1996 Chevrolet K1500 5.0L Pressure control solenoid VIN: 2GTEK19M6T Thanks for the replies. Actually all were on track,as a short to the chassis or in this case a brake pipe,was the problem. Running new wires to the trans, as John suggested, in this case would have fixed the problem. The problem was that until I knew where th...	3
	1997 Chevrolet K3500 Cheyenne 6.5L front brakes VIN: 1GCHK33F5V Thanks to all that responded. The rear wheel speed sensor was the culprit had to use the oscope to find it the red brick not fast enough. Thanks again	28
	2004 Chevrolet Trailblazer LS 4.2L low beam headlights VIN: 1GNDS13S54 As it turns out, the bcm does supply ground to relay to activate it, after swapping relays - headlights worked. wiring diagram was missleading from mitchell - showed bcm contoling power side of relay - this was wrong. thanks to all for the help.	5
	2007 Chevrolet Silverado 2500 HD Classic LS 6.6L speedometer VIN: 1GCHK23D57 Hi Guys, Thanks for the help. We are still trying to find out if we can get the info we need thru AC Delco TSS. For now we will send this one to the dealer to get reprogrammed. Thanks Again Carrold	6
	1986 Pontiac Fiero GT 2.8L discharge line VIN: 1G2PG9793G Thanx to all who replied. Unfortunately, the customer has put his car into storage for the winter, so I won't see it again until spring. But so many of you have good experience with specially made compression fittings with integral o-ring seals that I will be ...	10
	1998 Pontiac Grand Am SE 2.4L rear brakes VIN: 1G2NE12T7W i received several helpful tips so i did all i resurfaced the drums(drums were new) removed shoes and cleaned rust from contact points and added a little silicone based lube to contact points could not see any suspension problems the car has been gone fo...	11
	1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5288W Sorry it took so long to post repair, but this was a very intermittent problem. After finding a stuck open vent valve on the first go round and replacing it the Po446 would still come back usually after passing evap monitor and running for a few days. I finall... Trouble codes: P0446.	6
	1999 Saturn SL 1.9L high idle VIN: 1G8ZF5288X thank you for your help. The tps was the problem. I so use to the drive by wire stuff I have forgotten the tps should read 0%. The drive by wire is not uncommon to see a few %.	15
	2001 Saturn L300 3.0L Misfire VIN: 1G8JW53R51 Tried a new coil pack, new factory injector, smoked the engine for leaks, scoped and replaced the crank angle sensor. Still a misfire on #6 cylinder. Checked fuel pressure and vacuum at the motor all within specs. Vehicle left with the misfire and a unhappy... Trouble codes: P0300 (Gives random cyl. code but only cyl. 6 misfires).	7

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