iATN Member GM Auto Repair Tech Exchange for May 15, 2008

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Regal 3.8L No Start, Intermittent This is a very intermittent condition. Occassionally the customer well attempt to start the car and will encounter a crank/no start condition. After leaving the car for thirty minutes to an hour it will start. I have yet to get the car to no start for me or ex... Trouble codes: PO321 (Spark Reference Circuit), P1361 (Ignition Control Circuit).	View
	1996 Buick Riviera 3.8L Excessive Emissions, Stall This Buick sometimes starts like it was flooded out. The vehicle will stall and puff out black or gray smoke until you press the accelerator down and clear it. After it clears (about 4 or 5 seconds) it runs and drives normally. The problem is intermittent and ...	View
	1999 Buick Regal 3.8L Cuts out Customer stated vehicle would run rough , dash guages & lights would start flashing. Vehicle would die, then not restart. Afterwards would start, but shift interlock would refuse to work, and would not be able to put into drive. Using the left directional woul...	View
	2000 Buick Regal 3.8L blower motor Hello everyone!!! Buick Regal came into my shop with complaint that blower motor only works on high speed and the rear defogger won't work and a/c button only works when the blower is on in high speed. We replaced the blower motor resistor which didn't change...	View
	1987 Cadillac Allante 4.1L battery Hi again everyone,the problem Im having with this cadillac is battery going dead every 2 to 3 days. Check with amp meter my draw is 365 ma. pull fuses none take it down to at least 50 ma. circuit breaker 22 drops it to 210 ma. I let it set for about 45 minutes...	View
	1997 Chevrolet Pickup 5.7L abs Customers complant was low brake pedal after changing front pads he blead the brakes.he brought to me I rplaced abs hcu with used one from junk yard replace master cyclinder with reman from parts store I still got low brake pedal.	View
	1998 Chevrolet Malibu 3.1L No Start Customer had car towed in 1 month ago for no start. Car started when we went outside to push it in. We were able to get it to act up once. When you turn the key to start it acts like its in gear(no crank). All the lights are on and no theft lights at all. No c...	View
	1998 Chevrolet S10 Pickup 4.3L Poor Fuel Economy i just got this truck havnt had much time to mess with it so i dont know much about it the truck is only getting about 13-15 miles per gallon on the highway just wanted to know if any one has had this problem before if it is a problem i have replaced the lower...	View
	1999 Chevrolet Malibu 2.4L cluster - turn signals - a/c - starting Hello fellow techs - I have here a malibu with a no start - no turns - no a/c - and no cluster gauges or lamps.Car has theft codes in PCM & BCM. live data from BCM with snap-on modis shows this - ign 0 output- inactive - passlock data invalid- phase lock loop ...	View
	1999 Chevrolet Pickup 5.7L Mechanical thanks to everyone in advance. i just installed a new crate engine from gm dealer. started truck w/ new engine and engine ran fine for about 10 minutes. at idle, engine runs smooth and no noise. if engine is accelerated just above idle, engine sounds to have i...	View
	2003 Chevrolet Express 6.0L Misfire hi every one, truck came in with engine misfire, run scanner and found code po300 random misfire, #6 misfire, truck never had tune-up, so replace spark plugs, wires, gas and air filter, after tune-up. started van and runs great, test drove and came back to sho... Trouble codes: PO300 (random misfire).	View
	2001 GMC Sonoma 4.3L MIL Lamp on Hey guys, this is thrird time this truck has come back for code PO466A evap vent performance. Already replaced vent solenoild the first time. then the 2nd time I replaced the fuel pressure sensor and the air vacuum control solenoild. all parts came right from ... Trouble codes: PO466A (Evap vent performance).	View
	2003 GMC Yukon XL 5.3L Hesitation I bought this vehicle, and it has a hesitation in morning when taking off. After driving for 1 min. it goes away. I replaced fuel filter, checked fuel pressure, cleaned injectors, inspected ignition system. Inspected for vacuum leaks, but it goes away so quick...	View
	2002 Oldsmobile Intrigue 3.5L Cooling Systems While diving the car at low rpms temp gauge will go to 3/4 and you can hear banging noise in heater core from coolant boiling if you raise rpms over 3000 gauge wil go down. It will idle for hours without doing this but will happen under load at low rpms. I hav...	View
	2001 Pontiac Grand Prix 3.1L ignition key solenoid Help!! This '01 Grand Prix came in with a battery draw that would run the battery down in 1-2 days- Tech found that the 'Ignition Key Solenoid' that is part of the steering column electric park lock is always powered up. This solenoid prevents the ignition loc...	View
	2006 Pontiac Vibe 1.8L No Start, Cuts out car was towed in no start. car started and ran for 30 seconds and died. checked for codes can not communicate with scan tool. will loose spark and injector pulse. checked all power and gnds for computer.all good. seems to be in a fail safe mode for computer. i...	View
	2002 Saturn SL1 1.9L lifter tap have this 1.9 sohc engine that came in a couple days ago with the #4 lifter noise.removed valve cover and found #4 intake rocker loose and lifter pumped down.removed,cleaned and inspected and found nothing wrong.got a known good replacement from local head reb...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick Regal 3.1L theft thanks for all the good info. I forgot to say i tested the tumbler and it was good, key was good. The 1995 manual lead me to test the Theft module, do to no crank and no theft light on. But in 1994 this car does not have a Theft light. So I checked the resista...	13
	1996 Cadillac Seville 4.6L overheating WELL WE REPLACED THE HEATER CORE AND THE VEHICLE RAN FINE AFTER REPAIR WAS DONE. DID NOT OVERHEAT ANYMORE. THIS TIME WE RAN THE VEHICLE AND THEN LET IT SIT FOR AWHILE WITH THE RADIATOR CAP OFF. WE REFILLED THE SYSTEM AND EVERYTHING APPEARED TO BE OK. WE THINK...	13
	1996 Chevrolet Pickup 7.4L convertor lock up sorry it has taken me so long to reply,but the customer didnt come back until this week. i changed the vss sensoragain and checked all the wiring from the vss to the ecm/instrument cluster for problems. this didnt fix it so i removed the instrument cluster and...	6
	1997 Chevrolet Cavalier 2.4L Heater Core Thanks to all that replied. The consesus was to completely flush the system and fill it with dexcool. That is what we did. I removed an easily accessible freeze plug, upper and lower radiator hoses, water pump and heater hoses. I did find a fair amount of meta...	18
	1999 Chevrolet Pickup 5.7L power steering Pump was OK, hydroboost OK, Replaced Gear box, Test drove OK, Thanks for all the Help. David	12
	2000 Chevrolet Impala 3.4L No Start, no crank thanks to all that replied, great help, much appreciated. ...I replaced the body computer and took vehilce to another independent that had tech2 and he programmed new BCM and vehicle started right up no problem. I also had replaced electrical portion of ignit...	11
	2001 Chevrolet Express 5.0L Hesitation, Surge, Poor Fuel Economy, MIL Lamp on THIS ONE IS FINALY FIXED! THE PROBLEM TURNED OUT TO BE CAUSED BY A PARTIALY PLUGGED CONVERTER. ONCE THE VAN WAS GOOD AND HOT OUR BACK-PRESSURE READINGS WERE OVER 2.5 PSI. IT WAS CAUSING THE ENGINE TO GO LEAN AND A FALSE PO101 CODE TO BE SET. THE BACKPRESSUR... Trouble codes: PO101 (maf not within range).	15
	1996 GMC Sonoma 2.2L No Start Thanks for your response and as it turns out we installed a used computer which allowed us to start it up. then had it reprogrammed by a different tech (in this case not the dealer) all seems well at this time. All 3 responses were good, however Chet hit on th...	3
	2003 GMC Yukon XL 6.0L ride control Thank you for your replies, Warren you got it. What it seems is that there were 2 problems. The compressor, and the exhaust valve on the compressor (GM sells them all as one unit). My feeling is that the compressor shorthed the ESC module and was creating the ...	3
	2001 Pontiac Grand Prix 3.8L DRL, Headlamps, Instrument panel lights, HVAC, Sorry for the late posting. I do not know how other shops are going but this one is extremely busy and I am having a tough time trying to keep up. However, that is no excuse to keep you fellow techs in limbo about your excellent responses. 11 of the 13 respond...	13

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