GM Automotive Technicians Technical Discussion and Fixes for Jul 7, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1996 Buick Skylark Limited 2.4L transmission VIN: 1G4NJ52T5T Car sat for a about a month. Had been started several times and moved once. Went to pick up car for intermitant no start and the trans doesn't engage. Acts like it is stuck in park but shifter and shift cable move freely. Shaft on trans fork moves at least ext...	View
	1966 Chevrolet impala 350CID linkage? Hello fellow techs, I have a powerglide trans that come in for a leakage problem, seemed it leaked a rather large puddle if allowed to sit for long periods of time, of course it would not really leak for us, it was, you guessed it, intermittent. We suggested a...	View
	1994 Chevrolet S10 Blazer 4.3L ignition VIN: 1GNDT13W2S this vehicle has a rough idle and after runni\ng about 3 or 4 miles it quits wait about ten minutes and it starts back can not get scan data has communication error think bus is bad has mil light always on and vehicle will idle at ashop for hours and never die...	View
	1997 Chevrolet C2500 Cheyenne 5.7L brakes VIN: 1GCGC29R6V This vehicle was brought to the shop with an owner complaint of the brake pedal creeping to the floor with light to medium pressure on the brake. The owner stated that he had installed a new master cylinder. When that didn't help he acquired a used abs valve a...	View
	1999 Chevrolet Express 2500 5.0L injectors VIN: 1GCFG25MOX origanlly misfire on #7 (seems like it was at full fuel) then misfires on #s 2 5 and 7 smell of raw fuel and white smoke. some times it runs fine.	View
	2000 Chevrolet Cavalier 2.2L compreesor VIN: 1G5839T452 checked 134 level ok checked low side pressure ok at high rpm dead heads a idel cant get fitting on high side line to check high side pressure i think its the comp but would like to no if im on wright track sork cant give any more info besides it sisters car f...	View
	2001 Chevrolet Venture LS 3.4L No Start VIN: 1GNDU03E61 Ok I hope someone can help me here. Vehicle came in on the hook as a crank no start. found no fuel pressure. tested for power and ground at underbody connector, found power and ground, sold pump all good. Comes back 3 days later same crank no start. hook up sc...	View
	2002 Chevrolet Malibu 3.1L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G1ND52JX2 car came in with a skip at idle . #3 cylinder . switched spark plug , spark plug wire , coil ,control module , all injectors, checked for air leaks , removed rocker cover and checked rocker arm and valve movement , checked noid , fuel pressure and every thing ...	View
	2004 Chevrolet Silverado 2500 HD 6.6L Hesitation, Cuts out, Misfire VIN: 1GCHK23124 Test drove vehicle, under hard accel in 3rd and 4th gear, vehicle bucks rather violently. Feels like either an ignition miss, or tranny slip, but pretty violent. In 4th gear, it hits 60mph at 3200 rpm and feels like it hits the rev limiter, cuts out as you giv...	View
	1994 GMC C3500 Sierra SLE 6.5L no power VIN: 1GDJC34FOR This truck have no power at any speed, no smog from the tail pipe, no codes present. The Diesel MFI pump was replaced but ther is to electrical pumps one is hevyduty, the old pump have no numbers to corsse and I buy the non-heavyduty, the truck runs the same. ...	View
	1999 GMC Jimmy SL 4.3L always in 4wd VIN: 1GKDT13W8X This is a push button shift system,the 4wheel auto light is on. Pushing 2 wheel high 4 wheel hi or low, no lights on buttons and no shift. Car is in 4wheel drive you feel it when turning and on lift ft drive shaft is engaged. scaned for codes got dtc b2725 rep...	View
	2003 GMC Sierra 1500 Denali 6.0L unknown VIN: 2GTFK69U33 Hello, This is a Sierra Denali all wheel drive and 4 wheel steering (Quadrasteer). It is an extended cab. There is a clunk noise in the rear somewhere, slow speeds, turning and going over uneven terrain, either forward or reverse. The noise has been there ...	View
	1992 Pontiac Sunbird LE Value Leader 2.0L Engine VIN: 1G2JC51HXN Car was towed in for no start, found engine siezed. Oil and coolant levels were OK, had not been overheated. Couldn't bar it over on the front crankshaft bolt but found that I could get it to spin with a pry bar on the flywheel. After crunching through one or ...	View
	1998 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE12T0W Customer come to shop with code for cylinder #4 misfire. Another shop had already put spark plugs, 1 coil and coil cover and spark plug boots. I double checked their work and ohmed the coil cover and found it bad. I replaced coil cover, cleared codes and drove...	View
	2001 Pontiac Bonneville SE 3.8L A/C Temp VIN: 1G2HX54K51 I recharged this A/C system about a week ago. The customer was complaining of the driver side temp being hot and the passenger temp being cold. I felt a slight temp difference but my guage readings were too low signifying the need for a recharge. I recharged t...	View
	2001 Pontiac Grand Prix GT 3.8L Monitor reset VIN: 1G2WP52K51 Car came in for NYS inspection. Code 420 set Graphing the downstream O2 revealed it was switching lean to rich equal to upstream O2. Replaced O2 and sensor graphed correctly. Cleared code and attempted 1st monitor reset. O2 O2 heater and EGR reset with no p... Trouble codes: P0420 (Cat efficency low)	View
	2005 Pontiac Sunfire 2.2L temp gauge VIN: 3G2JB52F05 hi tech this 05 sunfire has temp gauge sometime go all the way to hot sometime it go pass hot and off the scale pointing to the other side. dealer check it find nothing wrong.it did happen to me once and engine temp on the scanner read normal I suspect the clu...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick Riviera 3.8L hard/no start VIN: 1G4GD22K4S Intake plenum gasket was leaking coolant into intake stream and fowled out the spark plugs. It seamed like a rich fuel condition at first as cust had not lost any coolant and the level was up when he brought it in. I should have trusted my instincts when i saw...	20
	1998 Cadillac Catera 3.0L Charging System VIN: W06V52R5WR We'll in the process of chasing a low battery problem, we replaced the negative terminal, because the pinch bolt broke, when we replaced the battery. That was at the end of the day. The next day the charging voltage was steady @13.8. I have to assume we had a ...	4
	1993 Geo Tracker LSi 1.6L No Start VIN: 2CNBI18UXP The firing order was exactly opposite of where it should be 9kv peak voltage is not sufficient for compression. Should have been in the upper 20's and was when I switched the wires around. Alldata has number 1 as the spot on the cap closest to the adjustm...	8
	1999 GMC K1500 Suburban SLE 5.7L powersteering VIN: 3GKFK16R4X The customer did not want to spend any more money. He decided to run the truck the way it is. This reply was very infomative If the pump pressures are within specs we usually add 10 psi of air to the front tires above the spec and then flush and fill system wi...	5
	2003 GMC Safari 4.3L vibration VIN: 1GKDM19X63 thanks to all who replied. replaced engine and trans mounts. this helped a little , but still had some vib at idle in gear. cleaned iac and throttle blade. customer happy, but still has vib. definantly better. customer said they would live with it.	11
	1989 Oldsmobile Cutlass Calais 2.3L disk / pressure plate VIN: 1G3NK14AXK Gentlemen We have repaired this clutch problem. Although the fix was not text book correct we got the job done. What we found was the clutch disk not being totaly released causing the input shaft to rotate enough to cause the grinding/hard into gear problem...	6
	1996 Oldsmobile Cutlass Supreme SL 3.1L evap purge solenoid VIN: 1G3WH52M4T cannister appears to have small pieces coming apart wicking their way up to vent solenoid and finallt ending up in purge solenoid and shorting it out. thanks to all who responded.	8
	2002 Pontiac Grand Prix GT 3.8L rotors VIN: 1G2WP52K72 THANKS TO ALL,MY PROBLEMS WITH THIS CAR WAS PRETTY MUCH 3 FOLD.AND WE HAVE ALL HAD THESE.FIRST WAS TYPICAL WARPED FRONT ROTORS.APROX. 1 WEEK PASSED NEW NOISE,LEFT FRONT CONTROL ARM BUSHING IN -OUT DONE RIGHT ? WRONG.APPROX.9 DAYS LATER CUSTOMER COMPLAINS OF "S...	14
	2005 Pontiac Montana 3.4L Power sliders VIN: 1GMDV33E45 Paul from New York hit it on the head. I found a plunger sticking on the door. Lubed them all and made sure they were free. Cleaned connections and relearned door as Paul suggested. Door has worked fine since (about 2 days of use with the kids). Thanks for the...	3
	2004 Saturn Ion Red Line 2.0L performance upgrade VIN: 1G8AY12P74 Hey guys thanks for the info.I made a bracket for the pedal.It works surprisingly well .The customer was happy with the change as well.Now if I can keep him from making it go POOF everything will be ok.Thanks Again Chris	3
	2004 Saturn Ion-1 2.2L clutch hydralics VIN: 1G8AF52F04 I, INSTALLED VACCUM ADAPTOR TO MASTER PULLED 15 PSI FOR 15 MIN, REMOVED VACCUM ADAPTOR, TOP OFF FLUID PUMP PEDAL AND REPEATED. IT TOOK 5 TIMES BUT THAN I HAD GREAT PEDAL. THANKS TO ALL FOR ALL THE HELP.	8

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