GM Automotive Technicians Technical Discussion and Fixes for Feb 6, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1992 Buick Roadmaster 5.7L Hesitation Vehicle came in because of no power. Wouldnt go over 30mph. We rplaced fuel filter, dist cap, rotor and road tested and now it goes up to 74mph max. When accelerating it doesnt have much power. Replace prom with an updated one with no change. Tryed reman compu...	View
	2001 Buick Regal LS 3.8L Hesitation, Cuts out, Stall VIN: 2G4WB52KX1 hi everyone. this car will not turn more than about 4300 r.p.m.s we have recalibrated the pcm but we are unable to do the crank re-learn because it needs to see 5100 rpms. the transmission has extened shifts also. when we rev. up the engine it stops at about 4...	View
	1991 Cadillac DeVille 4.9L parking lights VIN: 1GGCD53B1M The owner tells us that the parking lights come on in the middle of the night and discharge the battery. The next morning the car won't start with out a jump start. Both times he's brought the car to us on the afternoon after the event the battery is charged a...	View
	1993 Cadillac Seville STS 4.6L module VIN: 1G6KY5294P hI. THIS CADY CAME IN WITH THE COMPLAINT OF THE BRAKES HOLDING BACK. i TEST DROVE AND NOTED THAT TRACTION CONTROL WOULD ATIVATE JUST AS YOU RELEASED THE PEDAL (DRY ROAD) AND WOULD DEACTIVATE AS YOU ACCELERATED. tHE TRACTION WOULD BE ACTIVE SITTING IN PARK UNTI...	View
	1986 Chevrolet Corvette 5.7L Left Front Caliper VIN: 1G1YY0788G Trying to solve a sticking/hanging LF brake caliper. I know whats going on in that we can open the bleeder and caliper releases. Master cylinder and brake hoses good. Caliper pistons and slides operating freely. To our knowledge this system offers no codes an...	View
	1989 Chevrolet Tracker 1.6L No Start, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2CNBJ1365W hello everyone Have this tracker giving me all kind of weird readings. Says -40C in the shop for coolant and air temp,map sensor stuck at 255 kpa,02 sensor stuck at 1.275 V. also when it starts engine loads is at 99.6%(tps always stuck at that) Thinkin toward... Trouble codes: P0113, P0118, P1450	View
	1994 Chevrolet S10 2.2L heater VIN: 1GCCS1441S I have poor heat inside vehicle themp out of vents only get up to 76 degrees. replace thermostat, flushed heater core , replaced fan clutch and still can't get the temperature past 76 in cab. the engine temp does make it's way up to 85 degrees. any ideas as to...	View
	1995 Chevrolet C1500 Cheyenne 5.7L 1-2 shift, no OD VIN: 1GCEC19K4S Pickup came in for inoperative speedo and tachometer. On test drive, found no 1st gear (2nd gear start), and no TCC lockup at high speed. Problem is intermittent in that the customer says his speedo will come back every so often. Have 12v at trans. fuse #20, h...	View
	1999 Chevrolet K2500 Suburban 7.4L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GNGK26J3X This vehicle came to our shop with a check engine light on and a P0171 lean bank one code. We checked it over and replaced the upstream 02 sensor, cleared the code and returned the vehicle to the customer. Then the fuel pump quit, and we replaced that. Then th... Trouble codes: P0171, P0174	View
	1994 Pontiac Firebird 3.4L ABS System VIN: 2G2FS22SXR Hi Techs! This one is kind of stumping me, though I haven't had a chance to dig into it too far. Was hoping I could get some pointers in the right directions since this problem and type is kind of unusual to me. Here are my known symptoms thus far: 1) ABS ino...	View
	1995 Pontiac Grand Am SE 2.3L Heater core VIN: 1C2NE15D6S This is the 4th core in a year and a half. we have done electrolisis tests and have come up with readings that are with in specs. We have used oem cores and acdelco. We even ran a ground wire to the heater core strap. The motor mounts are good, so the hoses ar...	View
	1996 Pontiac Sunfire SE 2.2L throw out bearing VIN: 1G2JB124XT just replaced clutch slave cylinder, due to old part leaking,proir to replacing clutch slave, clutch operated fine, not slipping, now clutch slips all the time. when first started after repair clutch was ok. got bad on test drive about 5k. suspect hydralulic p...	View
	1999 Pontiac Grand Prix GT 3.8L poss. plenum VIN: 1G2WP12KXX customer came in and drove the vehicle here missing, car stall and would not start up again, pulled #5 plug out and was soaked with antifreeze, scaned vehicle 4000 misses since last start up, there were multipal miss fires in the frt cylinders, antifreeze leak...	View
	1999 Pontiac Grand Am SE 2.4L drl VIN: 1G2NE12T2X Hello Group, 1999 Grand Am that customers complaint is SES light is on. I scan the vehicle with a Tech2 and find a B2600 DRL malfunction. I notice right away that the right headlamp is inop. I install a new 9007 bulb. While looking over all of the lights on th...	View
	2001 Pontiac Grand Am GT 3.4L abs VIN: 1G2NW12E81 hello,i,ve got a good one here this car has multiple abs codes c1222 rf whl.spd sensor sig =0 c1225 lf excessive whl speed snsr variation c1232 lf whl spd snsr ckt open or shorted c1233 rf whl spd snsr ckt open or shorted it also had a communications loss code...	View
	2001 Pontiac Firebird Formula 5.7L rear indicators VIN: 2G2FV22G01 Gentlemen I have to fit a set of TVR Tuscan rear inicators to this Trans Am,they mount in the rear screen pillars inside the car and show through the rear screen on the TVR.the reason for fitting them is that in the UK we have to display amber rear indicators,...	View
	1993 Saturn SL2 1.9L Reverse VIN: 1G8ZK5573P Hi Techs, this vehicle came in for engine mount replacement due to harsh engagement into reverse. Found a failed front mount(rubber broken) and rear tranny mount to be weak. Replaced both mounts, however the harsh reverse problem is still present. Forward enga...	View
	1996 Saturn SL1 1.9L coolant resivoir VIN: 1G8ZH5280T We got this saturn in the shop with oil contamination in the coolant resivoir. the crankcase is completely clear of any coolant in oil. our thought was someone could have put oil in the cooling system does anyone out there have a good idea short of pulling th...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick Roadmaster Limited 5.7L Poor Idle Quality, Misfire VIN: 1G4BT5379N Well, I guess you never know if your new parts are actually any good!! I had tried temporarily replacing the ignition coil just to see if the misfire would go away, and it didn't. Today, the rat came in on the hook, with spark out of the coil so weak it wouldn... Trouble codes: 54 (Fuel Pump Relay).	7
	1998 Buick Park Avenue 3.8L engine VIN: 1G4CW52KXW Thanks to all of you for responses we replaced engine mounts, harmonic balancer, indexed the flywheel all required ordering and waiting for parts...non solved the problem. The fix was to remove the second rebuilt engine and replace the flywheel. The engine bui...	14
	1999 Buick LeSabre Custom 3.8L Hard Starting VIN: 1G4HP52K3X After 14 responses, I am still unable to verify whether or not this customer has a faulty fuel press. reg. (at least that's the consensus I got from a majority of the replies} The customer has still been unable to leave the car overnight & prefers that we don'...	17
	1991 Chevrolet K1500 Cheyenne 5.7L flywheel VIN: 1GCDK14K9M OK... The problem was ( as most people thought ) the junk aftermarket flywheels. Vehicle broke 3 from a Co. called 'motor-mite' , then bought a flywheel from NAPA and have had no trouble. I really find this tough to believe, but the results leave no other expl...	17
	1996 Chevrolet K1500 Suburban 5.7L Cuts out, Stall VIN: 3GNFK16R5T Hello again everyone. Sorry for the delay in posting this, but since the problem only occured every 100 miles or so, I wanted to be sure that the problem was fixed before posting this. Kudos to Ken and Loyd for nailing this one on the head...It turned out to b...	18
	1996 Chevrolet Corsica 3.1L Misfire VIN: 1G1LD55M3T thanks for everyones help i pulled the upper intake again replaced no. 3 inj. that seemed to be the cyl.that was miss firing the most although the resistance showed good and it was just cleaned and tested it seemed to fix the problem no more check eng. light c... Trouble codes: P0300.	10
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire VIN: 1G1JC5248V sorry it took so long. been real busy. we all like to spend every minute trying to fix these wonderful cars. i made the error of replacing only two of the injectors when i should have replaced all four. two more injectors and one egr valve took care of it. cou...	18
	1998 Chevrolet Blazer 4.3L frt differential so far so good, it needed the vacuum switch for sure that stopped the racheting type noise and so forth comming from the front diff, the jury is still out on the fuse blowing, vehicle has been gone couple weeks without incident, like george [...] I'm also suspi...	3
	1998 Chevrolet Cavalier Z24 2.4L No Start, Cuts out VIN: 1G1JF12T5W I didn't fix this car but the custmer took it to dealer and he got back to me that they but culster in it. it been fine since thank you for all the help nav Trouble codes: P1629, P0335, Z24, Z25, Z12.	4
	1999 Chevrolet Blazer 4.3L Heater core VIN: 1GNCS13W2X Only time will tell if all is well, but the starter was putting 1.68 volts into the coolant during cranking. I changed the starter and got the voltage way down, at .38 volts, but is still higher than what I would like to see. Thanks for all of your help guys.	14
	2001 Chevrolet Astro 4.3L Surge, Low power VIN: 1GCDM19W11 After testing back pressure, the van was taken to the dealer for replacement of the convertors. It was covered by the emissions warranty. The van is back on the road and the customer is happy (saved over $1000).	13
	1998 GMC K1500 Sierra SL 5.7L oil guage VIN: 1GCEK19R6W after entensive diagnosing found that the oil guage was no good, replaced dash and was perfect	7
	2001 Oldsmobile Alero GL 3.4L No Start, Cuts out VIN: 1G3NL52E81 Well, this one is fixed! I can't explain 100% how, but it's fixed. I unpluged all the modules on the wiring diagram and still had a class 2 data problem. The ACDelco tech line suggested I try the cruise module, which according to the wiring diagram does not ha...	3
	1995 Pontiac Grand Am SE 2.3L Cooling Systems VIN: 1G2NE15D1S A new g.m. water pump and thermostat fixed its flow problems. The only difference noted with the napa pump was the impeller fins were pressed on deeper than the g.m. counterpart. A difference of about .017' face to impeller clearance. No difference in appearan...	15

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