iATN Member GM Auto Repair Tech Exchange for March 11, 2008

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Open Help Requests for GM

	Help Request	Answers
	1993 Chevrolet Pickup 6.5L No Start, Poor Idle Quality This truck is starting hard all the time when cold and intermittently after warmed up. Customer stated that he had to jump the glow plug relay because sometimes the glow plug light wouldn't come on. It takes about 10 minutes of cranking and waiting in order to...	View
	1993 Chevrolet S10 Pickup 4.3L Excessive Emissions, Poor Idle Quality, Hesitation Vehicle came in with a complaint of intermitent loss off power. We found that it had original wires, cap and rotor and the distributor was coming apart. We replaced these parts and the vehicle still would die after 15-20 seconds of running. I checked for vacuu...	View
	1995 Chevrolet Cavalier 2.2L No Start hello everybody this one has got me!! this problem does not happen all the time,when it does it floods itself to the point of no start even when you go to clear flood mode what i see for scan tool data that i don't understand is the injector pulse width key on...	View
	2001 Chevrolet Silverado 4.8L MIL Lamp on checked for vaccum leaks none found,fuel pressure in specs,o2 sensors working fine,this truck will have a pre ignition rattle on slight incline ,however if runing premium gas it will not do it, Trouble codes: PO171 (fuel lean bank 1), PO, 174 (fuel lean bank 2).	View
	2001 Chevrolet Malibu 3.1L No Start Towed in no start , has fuel pressure and good hot spark ,but no injector pulse ... there is 12 volts to the injectors but no ground signal while cranking , how do i tell if this is a computer problem or a cam sensor ...what kind of signal should i have from t...	View
	2003 Chevrolet Silverado 6.6L No Start, MIL Lamp on we have a intermitten no start with this truck and a pile of loss of communication codes, we have checked wiring and relays, but everthing looks ok ! but before we start changing box's, has anyone seen this problem before. the trouble code tree for p1621 leads... Trouble codes: u1064 (bcm no data), u1800 (ficm to ecm no data), p1621 (ecm memory), po380 (glow plugs).	View
	2004 Chevrolet Cavalier 2.2L rack&pinion THANKS IN ADVANCE FOR THE HELP, THIS CAVLIER PULLS TO THE LEFT ABOVE 55 MPH. THOUGHT IT WAS TORQE STEER BUT STILL DOES IT IN NEUTRAL AS WELL. CROSS SWTICHED FRONT TIRES SAME PROBLEM,INFACT HAVE HAD ALL TIRES IN LEFT FRONTPOS. I THINKING THAT MAYBE THE RACK HAS...	View
	2005 Chevrolet Impala 3.8L Stall, Starts and Dies I have this Impala that starts and dies intermitantly, It will start and dies out when it wants to. Sometimes it starts fine and keeps on running. It will crank in park and neutral only and will not crank in reverse or any drive gear. I cleaned the throttle an... Trouble codes: P1811 (Max adapt long shift), P1819 (Internal Mode Switch - No Start Wrong Range).	View
	1994 GMC Suburban 5.7L Excessive Emissions, Cuts out this vehicle will not go into closed loop at idle (hot). oxygen sensor readings around 900mv to 1v. iac motor will lower itself to 30-40 counts. if i press throttle 5-10% the oxygen sensor starts switching and goes into closed loop hot or cold. if i leave it i...	View
	2000 GMC Safari 4.3L Poor Idle Quality, MIL Lamp on hello everyone, scanner shows #5 missing at idle on misfire counter, then off idle #5 stops counting and shows #6 missfiring. the fuel pressure bleeds of pretty quickly so i isolated the regulator and it holds pressure, with the fuel pump in the loop it bleeds... Trouble codes: po300 (random miss).	View
	1997 Oldsmobile Eighty-Eight 3.8L No Start, Stall This Olds has a peculiar issue. Stalls when in reverse. Sometimes hard to start. Cranks OK. What we found is, the fuel pressure drops to zero, when you put it in reverse. I've visibly checked for grounds from engine to body, engine to battery. No issues detect...	View
	1988 Pontiac Fiero 2.8L No Start i ran the check off shopkey for no start. check spark at 2 wires none. installed noid light and no light during crank. go to chart a-3 ign on check for power at both terminals on injectors yes. disconect 4 way conn at module touch harness con. at terminal 430 ...	View
	1999 Pontiac Grand Am 3.4L coolant Thanks in advance for any input. Customer concern of "pasty" matter in coolant jar. "pasty" matter turned out to be engine oil. Oil level 2 qts low.We removed oil sending unit and pumped air into oil system, no bubbles in coolant.Suspect head or head gasket fa...	View
	2000 Pontiac Montana 3.4L Wipers I have two of these Montanas running around with less than perfectly timed wipers-both came to me after an ice storm with the little tab bent on the park mechanism.We followed the procedure[mitchell] but in both cases we cant get the drivers arm right.Nothing ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Cadillac DeVille 4.6L compressor Well this guy finnally came back in and I did what you said and cleared the codes in the automatic air system. The result is the compressor works now. Thanks Guys!	18
	1998 Chevrolet Pickup 5.7L Poor Idle Quality, MIL Lamp on I ended up cleaning the EVAP purge vent and the MAF. Cleared codes and road tested. The fuel trims were at +or-2% or +or-2 of 128. Much better than the -17% before. Thank you all for your support, your time is VERY much appreciated! Michael [...] Trouble codes: PO172 (System Rich B1), PO175 (System Rich B2).	13
	2002 Chevrolet Silverado 6.6L starter THANKS TO PATRICK [...] FOR THE FIX HE RECOMMEND TO INSTALL A SHIM IN ONE OF THE BOLT HOLES TO MAKE THE STARTER HAVE A DIFFENT AGLE I TRYED IT AND IT WORKED I STILL THINK THAT THE FLYWHEEL HOUSEING HAS A PROBLEM CUSTOMER DID DECLINE THAT REPAIR BUT WAS HAPPY W...	9
	2002 Chevrolet Silverado 5.3L Battery drain Wow! Special thanks to many of you who scored this one on the money. Removing the circuit breaker for the power seats and my 8 amp drain disappeared. Passenger side seat switch which controlled forward and backward position was stuck attempting to move seat...	15
	2003 Chevrolet Tracker 2.0L rotors THANKS ALL WHO RESPONDED AFTER TWO SETS OF ROTORS FINALLY FIXED PULSATION IN FRONT.TWO SETS OF DRUMS AND NEW SHOES AND HARDWARE KIT ENDED UP TURNING ORIGINAL DRUMS TO FIX PROBLEM.ALL NEW DRUMS AND ROTORS WHERE MADE IN CHINA.THANKS AGAIN	25
	1996 GMC Suburban 6.5L No Start, Stall Thanks for all replies.Well since I am going to replace the valve cover gaskets I am going to pull pump and have Mid West Injection rebuild it and I am going to relocate pump driver with #9 resistor.Thanks again to everbody that replied.It is great to have thi...	14
	2002 GMC Sierra 6.0L cranking motor First off thanks for the help, the trans range switch was the culprit for the cranking problem and I have fixed most of the problems electrical but the hard starting is still a problem I suspect bad injectors or a bad regulator.	6
	1993 Pontiac Bonneville 3.8L Cuts out, Misfire Thankyou for your help. I was very hesitant to post the repair as I wanted to be sure the "thing" would not come back. After installing a used PCM (only your help led me to this, no diagnostic trouble tree) and a crank sensor the problem is fixed. Trouble codes: 17 (spark reference problem), 18 (camshaft crank error).	20
	2000 Pontiac Bonneville 3.8L abs system Greetings, techs. Thanks to all that offered help. I have not yet fixed this car. Most replies centered around either an intermittant wheel bearing sensor or an intermittant harness at the wheel. I have tugged, bent, pulled the harness every way I can think of...	9

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