iATN Member GM Auto Repair Tech Exchange for May 12, 2008

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Park Avenue 3.8L Stall, start and stall Well fellow techs,this is something I cant seem to locate. This customer brought it to us to avoid the shot gun repair her previous shop had started on.The vehicle will start and run 2 to 3 seconds and then stall.The fuel pressure stays solid throughout the ev...	View
	1994 Buick Regal 3.1L theft I'm working a 1994 buick regal. no start. Need to locate the theft deterent module. I believe it is at fault. Need to test the ground and 2 power to it but cann't find it and what does it look like?. looked every where. Have a 1993 and 1995 service manual but ...	View
	1999 Buick Regal 3.8L steering box Car came in for a noise when turning RIGHT on accel, or say 5-10 mph. Sounds like a chirp type noise(like a belt tensioner chirp), but is louder & is coming from on the right side lower area(we sat under the hood to verify). We did remove the belt & no diff. H...	View
	1992 Cadillac DeVille 4.9L engine The customer brought this car to us complaining of hot soak no start. We verified the vehicle started and ran when cold and checked his charging system. The battery had a weak cell that would show up under load testing and got worse when vehicle got hotter. We...	View
	1996 Cadillac Seville 4.6L overheating hi guys, have a nightmare here. we performed an oil change on the vehicle. customer left and called less then 15 minutes later to say the vehicle was overheating and there was a major coolant leak. we towed vehicle in and found no flow thru the system. we repl...	View
	1993 Chevrolet Camaro 5.7L No Start Hello gentlemen,this vehicle came to me via another garage they have replaced the ign. coil & module.I have scanned it and no codes present I also bypassed the ign. key chip and checked the harness all OK.The engine cranks over fine and the fuel pump primes up...	View
	1993 Chevrolet Pickup 7.4L Mechanical There is a moaning through the entire vehicle, when the ac clutch is on.this was there with the old compressor also.customer says it was there for a long time and was convinced the compressor was going . It was brought in for a re-charge after all parts were c...	View
	2000 Chevrolet Impala 3.4L No Start, no crank won't crank, check engine light flickers once but doesn't come on, no communication, rest of ipc lights flash and go out when ignition is put to start position, once key is turned on parking lights stay on and only go off if battery is disconnected, I suspect ...	View
	2001 Chevrolet Express 5.0L Hesitation, Surge, Poor Fuel Economy, MIL Lamp on help! we had the trans. rebuilt about 1 week before this problem started. the van is loaded heavy but since the c.e.l came on it has lost power and fuel mileage. we have checked for vacum leaks and any unmetered air entering the engine. we also replaced the f... Trouble codes: PO101 (maf not within range).	View
	2003 Chevrolet Blazer 4.3L Misfire, MIL Lamp on HEADACHE!!. owner of vehicle is a friend of shop. came in, service engine soon light on. scanned- po300. cyl. #4 misfire. decided he wanted to tune it up himself. replaced fuel filter, cap, rotor, plugs and wires(with quality products). came back, same problem... Trouble codes: PO300 (MISFIRE 4 cyl.).	View
	2004 Chevrolet Impala 3.4L unknown There is a buzzing/whining noise coming from the left firewall area in park/neutral only. We can only hear the noise when sitting inside the car, windows up, radio off. Under these conditions the noise is fairly loud. When you put the trans in gear the noise g...	View
	2007 Chevrolet Tahoe 5.3L pinging, spark knock Need some help from the G.M. dealer techs. This 2007 Tahoe pings (spark knock) badly on 87 octane fuel. 87 octane is the recommended fuel for this engine. Pinging (spark knock) worse when in 4 cylinder mode, but still noticable in 8 cylinder mode. Pinging goes...	View
	2003 GMC Sierra 4.8L Starts then Dies This is our parts truck and I am a Volkswagen tech not real familiar with GM, came in for tune-up. Replaced plugs, wires and fuel filter. Started and ran fine. When went out to drive it was very sluggish and misfired on load. Ceck engine light came on and had ... Trouble codes: P1514A (Throttle Body Performance).	View
	2004 GMC Envoy XL 4.2L Misfire, MIL Lamp on Vehicle was driven in, cutting off ses light was on and flashing also reduced power light was on. Check dtc found po302 cyl 2 misfire, R&R coil and plug, spark plug was soaked with fuel, used a spark tester on coil no spark. Removed cylinder 3 coil and tested ... Trouble codes: po302 (misfire cylinder number 2).	View
	1989 Pontiac Firebird 5.0L Poor Idle Quality, Surge, Stall Hello this car has a problem stalling out after starting,it exhibits a lean condition untill it enters closed loop. the engine starts runs above 1,000 rpm for a few seconds then decline steadily for a few more seconds untill it stalls the fuel pressure remains...	View
	1997 Pontiac Grand Am 3.1L No Start, Stall This thing is driving me nuts, it will start and die as soon as the pcm shuts off fuel because it doesn't get the proper signal from the dash. I understand the pass lock ign. sends the signal through the ipc. The problem is the security light doesn't flash or ... Trouble codes: 1229.	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Buick Electra 3.8L Extended crank time As I suspected and most of you too that the fuel pump was the culprit here. The fuel pressure was building too slow after it set for a long time. Other replies ranged from tps sensor to cam sensor to crank sensor, but the majority of you said it was the fuel...	33
	2003 Buick Rendezvous 3.4L abs sensors? monday may 12th. buick back in shop today.the biggest help was to use a graph on my scanner. found LF speed sensor drop off to zero at one point. it now set a coo35 code which i didnt show before. i did check sensor with a ohm meter,found a good reading at tha...	11
	1990 Cadillac DeVille 4.5L Cuts out, BACKFIRE THANKS TO EVERYONE WHO REPLIED, JOE FROM TEXAS WAS THE FIRST TO PINPOINT THE PROBLEM. I WENT RIGHT TO THAT STUD. I FOUND THE WIRES WERE CLEAN AND TIGHT BUT THE STUD THAT WENT INTO THE BLOCK WAS LOOSE. THAT WOULD EXPLAIN WHY IT WOULD ACT UP COLD NOT HOT. I REMO...	11
	1998 Chevrolet Tahoe 5.7L Surge, lack of power this was a fuel pump problem replaced the pump and it was find thanks, for all of your help.	14
	2000 Chevrolet S10 Pickup 4.3L belt noise thanks for all the replys, most of them said to check powersteering alignment,but when i posted my question i said all the pullys were good and in alignment, so what i did was put a half inch shorter belt on it,and hopefully that will cure it,because nothing e...	33
	2000 Chevrolet Silverado 5.3L Poor Fuel Economy The Fuel Mileage Has Increased Aprox 1.5 MPG We HAve In Installed a Throttle Body Spacer Kit and Reflashed The PCM again I Feel The Mileage is Fair For This Vehicle I Have Told Him To Try Midgrade Fuel To See If It Goes Up Thanks For All The Great Tips But I F...	20
	2002 Chevrolet Impala 3.4L radio lighting The customer didnt request any further testing at this time. We strongly feel after testing that the light problem was an internal problem. Thank you for all the help we received.	3
	2003 Chevrolet Express 6.0L Misfire, MIL Lamp on Thanks to all that responded but there is an old WHO song called "I can't Explain" but on this truck I noticed the even [...] trimwould go to -5% and the miss would come in on #6 cyl so I switched o2 sensors and started the vehicle and the fuel trim for 13... Trouble codes: p0300 (misfire).	5
	2004 Chevrolet Silverado 6.6L MIL Lamp on Told customer to drive the truck a little harder to get turbo to work and that seems to have kept the light off. Also found out that truck is still under warranty so any more probs and it will go to dealer. Trouble codes: p0045 (TC solenoid circuit fault), P0299 (TC underboost).	3
	2005 Chevrolet Silverado 4.8L compressor clutch hi all,after getting the wiring diagrams and pinout for the pcm i found the 5 volt reference wire broken about 1 foot from the high pressure sensor. it looked as if it had been burned ie the copper wire was brown and had to be cleaned before it would take sold...	10
	2001 Oldsmobile Silhouette 3.4L No Start, Cuts out, Stall thanks to all that replied. i had a bad connection in the under hoood fuse box, cleaned the connectors and all is fine.	6
	1997 Pontiac Sunfire 2.4L No Start Hi I checked the feeds and grounds coming into the PCM. It turned out to be an open circuit on PCM C1 pin 18 on the pink wire which goes to the under dash fuse box to the ECM injector 10 amp fuse. I ran a new wire from the fuse box to the PCM as requested by ...	22
	2000 Saturn LS2 3.0L Radio This is fixed and the customer is very happy. The ground "splice pack" located in the rear corner of the engine compartment is the ground bus for several circuits, one of them the radio. I had cleaned it because of the BCM issue, but did not take the connector...	6

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