GM Automotive Technicians Technical Discussion and Fixes for Jan 4, 2005

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick Park Avenue 3.8L Battery VIN: 1G4CW52L7R This car has an over night drain of the battery. The battery is new and tests good. The alternator tests good and the diodes are fine. None of the courtesy light stay on but the radio clock stays on all the time in this car even after the key is off. Don't kno...	View
	1992 Cadillac Eldorado 4.9L Poor Idle Quality VIN: 1G6EL13B3N We were asked to check this vehicle but don't spend any money?? to see if we could find the problem. We have spent a little time on this problem twice now but find nothing. The car idles rough until the operating temperature is up to spec and then the car idle...	View
	1996 Cadillac DeVille 4.6L insturment panel and interior lights VIN: 1G6KD52YXT Did system self test and has codes for loss of serial data to dash and climate control and also body control. Aslo loss of serial data to antilock brake module. This problem only happens in cold overnight conditions and is very interm. Had it happen to me one ...	View
	1969 Chevrolet nova 250CID Mechanical VIN: 1G3K4124FR I want to know if a s10 disc brake system can be adapted to my 69 nva to give me disc brakes at low cost.I don,t know but i think the spindles will interchange with the nova system	View
	1996 Chevrolet Cavalier Z24 2.4L Hesitation, Misfire VIN: 3G1JF12T6T Hi thanks in advance this cavalier has a jerking or what feels like a miss usually only in 3rd or 4th gear. it only happens warm and only on slight throttle. it will not do it in 5th gear.if driven hard or hard throttle it runs great. we replaced all the tune...	View
	1997 Chevrolet Blazer 4.3L Misfire, MIL Lamp on VIN: 1GNDT13W4V Hi all in IATN land This Blazer came to me from another shop. I scoped the motor and scanned the computer systems. Cam sensor lab scoped fine, but the crank sensor at and above 2800 rpm would develop a ghost signal about every sixth signal. I found this odd as... Trouble codes: P1341 (Can Sync), P0339 (Crank Sensor Erratic)	View
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on, Low vacuum VIN: 1G1JC1244V This vehicle came in on the hook and would not run long enough to matter. We found a bad 1-4 coil and proceeded to replace the coil packs, module, and crank sensor. The customer had been trying to "save some money" and put in the wrong plugs and wires, so we t...	View
	1998 Chevrolet S10 4.3L warning lights VIN: 1GCCS14X4W Warning lights in dash cluster stay on with truck running. Check engine light not on. ABS,Battery and security light stay on. Alt chargse fine. Installed another one, light still on. Security light stays on 24 hours per day. New battery goes dead. No codes fou...	View
	1998 Chevrolet Malibu LS 3.1L Misfire, MIL Lamp on VIN: 1G1NE52M7W this vehicle is exhibiting random misfires on all cylinders (particularly at idle) on scan data. I've read that these engines have many problems with the injectors so we attempted to flush them several time with no change at all. if any one has any suggestions... Trouble codes: P0300, P0404, P1404	View
	1998 Chevrolet Corvette 5.7L Blend Door VIN: 1G1YY226W5 Need some help with this one guys. Car has no heat out of left (drivers side). Passenger side ok. Pulled codes and found B361,Bo363,and Bo441 set. Cleared codes and the 363 code came right back. We replaced blend door actuator on left side (up past accelerator...	View
	1999 Chevrolet Silverado 1500 5.3L no fast idle VIN: 2GCEK19T3X started cold this morning, no fast idle rpms low, modis monitor shows (cold start no) does anybody know what this means or how it is checked. also no codes, I could not find a iac relearn procedure in modis. am going to replace fuel filter and clean mass air f...	View
	1999 Chevrolet Malibu 3.1L Poor Idle Quality, MIL Lamp on VIN: 1G1ND52J0X I'm positng for another shop on this random misfire. A MotorVac was done by the local dealer, with no change. Dealer claimed excessive carbon contamination. This shop pulled the heads and found them to be clean. I believe the plugs, wires and fuel filter have ... Trouble codes: P0300	View
	2000 Chevrolet Express 2500 5.7L Poor Idle Quality VIN: 1GCGG25R6Y Good Morning This van has an intermittent high idle. It has happened 3 times in 47,000 miles. The test data provided is freeze frame data from code P0507, the data for P1509 is similar. The driver reports as he comes to a stop the idle is very high. Putting th... Trouble codes: P0507 (Idle Control System High RPM), P1509 (IAC High RPM)	View
	2002 Chevrolet Impala 3.8L reverse lights,drl lights VIN: 2G1WF55KX2 this chev. is driving me nuts.the car can be sitting,engine off,key off,and the back-up light relay will start clicking at anytime.when this happens,the back-up lights will start blicking dim.when this happens if you turn the key on the drl relay will start cl...	View
	2003 Chevrolet Silverado 3500 6.6L overdrive VIN: 1GCJK33163 Hi guys. Truck will not shift out of overdrive on medium to heavy accelaration. Owner says he needs to stop and shut engine off to make transmission shift pLeroperly. Any help would be appreciated. Thanks, Joe	View
	1995 Geo Tracker 1.6L Excessive Emissions VIN: 2CNBE1862S Thanks to all who can help in advance. Vehicle can in for ASM Smog Check. Vehicle runs well, only failure is NOx at both 15mph and 25mph. Vehicle is running at operating temp.. Timing is at 3deg btdc. Checked EGR operation, manifold vacuum was 22hg at 3000rpm,...	View
	2002 GMC Yukon SLE 5.3L Excessive lash in pinion VIN: 1GKEC13Z02 This is my personal vehicle.This problem started about 48k,and seems to be getting worse.Am I missing something.I did remove the diff cover,and didnt see anything abnormal.Your help is greatly appreciated.	View
	1993 Oldsmobile Cutlass Supreme S 3.4L Timing Belt VIN: 1G3WT34X7P I replaced tensioner bracket and belt. Now it's back six months later with the belt hanging off the cams and wearing into the covers. The idler pulleys have a retainer edge on them that does not appear to be damaged. The belt seems to be trimming itself off by...	View
	1996 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: IG3HN52K7T posting for a friend who has tried to remedy this code himself. he replaced the MAP sensor but code returned. i checked the car out today - no vacuum leaks present,no drivability symptoms present - MAP ground faultless, VREF faultless, return voltage exactly a... Trouble codes: P0106 (MAP sensor out of range)	View
	1995 Pontiac Grand Am SE 2.3L heater core VIN: 1G2NE15D7S hey guys, really need some input onthis vehicle. back in 2002 vehicle was towed in from another shop. replaced the engine with a jasper rebuilt. vehicle kept having problems with the temperature guage going to high. Checking with a snap-on scanner to read cool...	View
	1997 Pontiac Grand Am GT 2.4L abs module VIN: 1G2NW12T6V run test on snap on scanner code 43 last code present vel speed rph 19.replaced right front sensor. contiues to get a snapping noise under hood as if the abs sensor is working when braking on dry roads. first 10 vin#[...]	View
	1997 Pontiac Trans Sport 3.4L abs VIN: 1GMDX03E6V Vehicle returned and we were unable to duplicate the customers complaint. Another month later the vehicle returned and the lights were on steady and able to duplicate with a short test drive. Did a snapshot of the sensors when the code 26 set and found that th...	View
	2000 Pontiac Bonneville SSEi 3.8L Surge VIN: 1G2HZ5416Y This car will surge at cruise speed with a slight tip in throttle of about 20%. The engine rpm will change about 500 rpm up and down until you change your throttle position in either direction. I have captured two snap shots with our scan tool the only thing t...	View
	2001 Pontiac Sunfire GT 2.4L Surge VIN: 1G2JD12T11 Hello, Ever since our local temperature dropped to sub - sub zero last week, this Sunfire has exhibited a rhythmic surge at 4000 RPM in neutral of about 400 RPM (4000 - 3600, 4000 - 3600 etc.).As well, while driving when accelerating the engine will power dow...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Chevrolet Lumina Z34 3.4L Excessive Emissions, No Start, Poor Idle Quality, Stall, Misfire VIN: 2G1WP11X2M thanks for the replys . I did find 1 injector that was out of range , replaced it and still had a hard start problem ( but better then before) the customer elected to take the vehicle to another repair shop and I haven't heard anything back as to what was foun...	6
	1994 Chevrolet Van G10 5.0L no overdrive after rebuild Raplaced all 3 solonoids. shift and kickdown,test drove and it worked fine until i turned around to head back to shop,then same problem occurred.Customer needed van for work,so I told him to take it and drive it and hopefully it would continue as it did when I...	19
	1996 Chevrolet Blazer 4.3L Evaporator VIN: 1GNDT13W7T Thank you for the great responses! It made it a lot easier with the fender well removed (a relatively easy task). I don't understand why this is not in the G.M. factory manual. The rubber/plastic cover was destroyed during removal and the customer did not want...	7
	1996 Chevrolet Blazer 4.3L Transfer Case VIN: 1GNDT13WXT First, thanks to all 19 who replied. As I originally stated this vehicle belongs to one of the techs in the shop. Initially he scanned the truck and found no codes. Unfortunately I didn't post this info in the original post and update. Secondly he tested and c...	20
	1997 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R4V Hope everyones Holidays were good.Thanks to all who responded to my aggravation.As the vehicle's engine was partially disassembled at the time of the request,we were unable to do the crankcase vacuum test.That,however, will be one for the test bank. It was dec... Trouble codes: P0300 (random cylinder misfire).	10
	1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GTEC19T0X Thanks to everyone who replied, this one was tougher than most. Eric [...] was right on target, it ended up being a crack in the plastic resonator air intake tube. It was cracked right along the seam where it was put together. I guess when truck running @ cru... Trouble codes: 0171 (System lean bank 1), 0174 (System lean bank 2).	29
	2000 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG39R4Y thank's for all of your replies. everything from cam timing,o2 sensors,ecm,fuel injection. this is a service van that is on the road constantly. i only have an hour or two at a time to diagnose the problem. the problem is so intermittent i have yet to find it.... Trouble codes: P0340.	14
	2001 Chevrolet Malibu LS 3.1L crank no start VIN: 1G1NE52J21 As suspected the car never acted of again after that very cold morning. I went ahead and decided to replace the ignition switch. I think and hope I made the correct decision. I disassembled the switch and found the internal contacts to be black and burnt looki...	6
	1998 Oldsmobile Intrigue GL 3.8L gearbox VIN: 1G3WS52K1W after all the adjustments,and all the hours I replaced the power steering pump assembly.problem solved.Thank you all for the help	3
	1997 Pontiac Grand Prix GT 3.8L Poor Idle Quality, Surge, Stall, High cold idle VIN: 1G2WP52K6V Hello all, thanks for the help. Sorry it took me so long to close. I ended up focusing on the PCV and the TPS and found that the lower o-ring on the pcv was missing and the TPS wouldn't zero (%). Installed new OE PCV kit and TPS. Drove the car home and release...	11
	1997 Pontiac Bonneville SE 3.8L internal leak VIN: 1G2HX52KXV Got 2 replies for trans cooler, 2 for upper intake and lower intake gasket, and 2 for a oil distributor manifold. Replaced radiator, all 4 coolant hoses, t-stat and gasket, flushed cooling system 3 more times (6 times total) to remove as much oil as I could. G...	6

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