GM Automotive Technicians Technical Discussion and Fixes for Aug 18, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Chevrolet Beretta GT 2.8L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Stall VIN: 1G1LV11W0J Hello techs.. I have a problem here. 1988 Chevy Beretta came in and would not start.. After cranking a while we could get it to start and noticed that all PID's were off the wall. Every thing was wrong showing numbers that did not make sense at all. We replace...	View
	1993 Chevrolet K2500 Suburban 7.4L Low power VIN: 1GNGK26N5P This has been to different techs and we are now working at diagnosing it. First of all the problem: The timing retards about 19 degrees when accelerated instead of advancing. This has had the computer replaced with a GM computer it has had a new Prom put in it...	View
	1994 Chevrolet Cavalier Z24 3.1L no fuel pressure VIN: 1G1JF14T1R replaced 2 fuel pumps,still have same problem.won't start,no fule pressure.	View
	1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GNCS18WXS This Blazer is a buddy's truck. Truck surges and hunts for an idle pretty much all the time. Sometimes it levels out for a couple of minutes but after snapping throttle or just after enough time it starts to surge again. Truck has plenty of power on road no bu... Trouble codes: 44 (Lean Exhaust)	View
	1995 Chevrolet Blazer 4.3L Poor Idle Quality, MIL Lamp on, HARD BRAKE PEDAL VIN: 1GNCS13W4S THIS VEHICLE WAS TOWED IN LAST WEEK. CRANKED BUT WOULDN'T START. NO FUEL. IN MAY, ANOTHER SHOP HAD REPLACED THE FUEL PUMP FOR SIMILAR COMPLAINTS INCLUDING A HARD BRAKE PEDAL (NO POWER ASSIST). DROPPED THE FUEL TANK AND NOTICED A VERY OBVIOUS ODOR OF ROTTEN FUE...	View
	1996 Chevrolet Blazer 4.3L ac/heater mode switch VIN: 1GNDT13W3T Having prob with my 1996 blazer, the typical upon accel the mode switches from the vent to the defrost. have replaced the vac check valve under the hood. can hear vac leak from the vac part of the mode switch on the dash. pulled switch and tested all vac lines...	View
	2000 Chevrolet Silverado 1500 5.3L Pedal, Master cylinder VIN: 2GCEK19T1Y Owner took truck to Florida in fall towing a 31 ft trailer. Truck remained in FL all winter and back to PA in late April. Brake pedal resistance has steadily been lessening. Going down street at 25 mph and something pops out into the street, hit the pedal, goe...	View
	2002 Chevrolet Silverado 2500 HD 6.0L ps pump VIN: 1GCHK24V72 hello to all and thanks in advance for your help ,truck came in yesterday had no power steering and no power brake assit. found broken pump shaft . installed new pump worked fine for about 15 min. and pump failed again.see a lot of older diffrent post about se...	View
	2002 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2GCEC19T42 vehicle is miss firing on 1,3,5,7 can remove injA fuse and engine changes a bit but not much,have checked spark and it is good,ran inj bal test and all are even psi's,on the inj kill test 2,4,6,8 all effect the engine but when 1,3,5,7 are killed it didn't make... Trouble codes: P0300 (Random misfire)	View
	1996 GMC C1500 Sierra SL 5.7L air in fluid VIN: 2GDEC19R8T A power booster and master cylinder were replaced by a chain store. When the customer picked up the truck the brake pedal would go to the floor and the will not stop. The store then said the wheel cylinders were the problem. they replace them and the truck wil...	View
	1999 GMC Sierra 2500 SL 6.0L evaporater core VIN: 1GTGK29U8X This vehicle came in wth the compressor belt chattering all postings suggested replacing ac compressor we did that and that problem has gone away. now we have a new problem, The evaporator core is freezing up like ablock of ice. we brought it back in and repla...	View
	1990 Pontiac 6000 LE 3.1L Poor Fuel Economy, MIL Lamp on VIN: 1G2AF54T1L Hi Gang, I'm stumped on this old pontiac. It is sooo rich it blow black out exhaust. Originally had stuck o2, we replaced and problem still there although o2 reads now. Tried known good pcm and prom because we have no baro reading although map reads fine. Repl... Trouble codes: 44 (Lean)	View
	2001 Pontiac Grand Am SE 2.4L No Start, MIL Lamp on VIN: 1G2NF52T51 This vehicle has never started and ran since we have had it. Spinning the engine over with the starter immediatly shows a P0336 CKP sensor performance. The ckp has been replaced along with 2 PCMs. I went as far as to pull the oil pan to inspect the crankshaft ... Trouble codes: P0336	View
	2001 Saturn SL1 1.9L line pressure VIN: 1G8ZH54891 This Saturn has high line pressure all the time. It is not maxxed out, it does vary with load, but it bangs really hard when shifting, and going from nuetral to reverse especially. In reverse the PID for pressure reads 215. In drive it reads over 100. There ar...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Century Custom 3.1L Mechanical VIN: 2G4WY55J0X The score was 6 repair- 2 rebuild. My customer read all replies and after two weeks of deliberation chose to rebuild. James from Alabama[ROLL TIDE] and my rebuilder both felt that it was possible that it could fail soon after the repair. Most others had not ha...	9
	1987 Cadillac Allante 4.1L headlights, brake, parking, dash lights, no radio, VIN: 1G6VR3172H Did not fix this vehicle. It had many issues and could not find a central problem. Fuses and links were all OK. Lights are controled by body computer and I could not comunicate with it. Sorry no fix here.	4
	1997 Chevrolet K1500 Suburban LS 5.7L rear hoses VIN: 1GNFK16R8V Well at this time the customer is going to wait longer than I can keep this post open. The opinions seem evenly divided between converting to a front only system, to various procedures freeing up the rear evap. lines. I feel that a cutoff wheel used carefully,...	20
	2000 Chevrolet Astro 4.3L brakes VIN: 1GKDM19W3Y thanx to all the replies from around the states, come to find out the brakes did not have anything to do with the pulling, even though the van now has brand new brake parts all around. the idler arms had a little too much play causing the steering wheel to tur...	15
	2005 Chevrolet Aveo LS 1.6L pads VIN: KLITD62604 Thank you for all the replies. We called the customer and suggested replacing the pads and rotors. the customer called the dealership and convinced them into still doing it under warranty ( 15k on car). the customer satisfied with the result. Thanks to everyon...	8
	1998 GMC K3500 Sierra SL 5.7L Misfire, Poor Fuel Economy VIN: 1GTHK33R5W Replaced dist cap and it ran great.Thanks IATN and everyone that responded.	12
	1994 Oldsmobile 88 Royale 3.8L No Start, Stall VIN: 1G3HN5219R Well I kept this car for a week drove it 75 miles let it idle here for probably 2 days with no symptoms. I know I cant fix this car if I cant reproduce the problem. I scoped the ckp sensor for hours saw no glitch. I checked all the wires that I could with no r...	9
	1969 Pontiac Grand Prix 400CID Temp gauge VIN: 276579P271 I got spec's that I think are correct from John [...]. His reply was, Per specs in my Borroughs bt-7707 gauge tester from 100 degrees--350 ohms 210 degrees--76 ohms 250 degrees--51. I tested my gauge and it reads past 250 at 50 ohms but I think it is close....	13

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