iATN Member GM Auto Repair Tech Exchange for May 30, 2008

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Open Help Requests for GM

	Help Request	Answers
	1989 Chevrolet Camaro 5.0L Cuts out, Stall OK..I dont ask for help much on here but I got one thats drivin me crazy. I am a Honda tech but IM working on this one at home. I do have some previous GM experience but I need you GM guys to help me out on this one. Here goes. This IROC was brought to me with...	View
	1998 Chevrolet Cavalier 2.4L abs module-no communication vehicle came in with the abs and brake warning lights on. hooked up Solus and checked for DTCs. no communication between module and scanner. checked DLC connection, fuses and relay:good. checked for communication between scanner and PCM:ok. suspected a failed ...	View
	1999 Chevrolet Malibu 3.1L feul and temp gauge car came in with no feul gauge or temp gauge.hook modis up and the fuel sender has 205 ohms checked back at sending unit with meter and 207 ohm.than looked at cooling temp and the scanner show its working goes from the temp out side to 220 than the fans come o...	View
	2000 Chevrolet Blazer 4.3L Hesitation, Cuts out, Stall Hello there I have a problem child here. This blazer is cutting out and will stall under a light load while taking off. If you brake torque the vehicle it will easily build power to where the tires just barely spin(has low power), but if you put it into gear a...	View
	2001 Chevrolet Monte Carlo 3.8L low power,boggs Hello,I have been working on this 01 Monte Carlo SS 3.8 vin k. Customer has replaced the Cat,and Fuel Pump to try and correct the problem.MAF had erratic readings for me and eng would die when tap testing,so ihave replaced that as well.Heres the problem,after ...	View
	2003 Chevrolet Cavalier 2.2L Dash vibration This car has a vibration in the dash right behind the center defrost vent the whole dash pad in this area will vibrate up and down but only when the ac is on and the rpms are just right between 800 and 1100. It seems to be most noticeable when slowing for a st...	View
	2003 Chevrolet Silverado 6.0L Oil Leak The vehicle came in with the oil level light on. There was oil dripping all over the ground. The oil pressure is low on the gauge and a large amount of oil is coming out of the draft tube. We are not shure why oil is continuing to come out of the draft tube at...	View
	2004 Chevrolet Aveo 1.6L MIL Lamp on thanks for any and all help on this one. orginially came in with po300 and po1781. changed plugs and wires. no help, can find no intermitten miss. tested po1781 tcm sending engine speed info to pcm false. test called for checking voltage on c.a.n system from p... Trouble codes: PO300 (intermitten misfire), PO700 (tcm set code thru pcm), PO700PD (na), PO1781 (tcm comm to bcm about engine speed malfunction).	View
	2005 Chevrolet Venture 3.4L starting van was brought to shop, customer explained he was driving down the road and the van died all of a sudden with no warning. van does not crank over, I checked batt voltage wich was acceptable at 12.6,checked fuseable links a starter and found to be good.Checked...	View
	2006 Chevrolet Silverado 5.3L A/C compressor A/C clutch was melted. Replaced with complete assembly. No A/C clutch operation. Charge is good. Any known concerns with A/C on these???	View
	1997 Oldsmobile Achieva 2.4L No Start some times the car starts no problems. at time no pateran car start then stalls secerity light flashes 5 time or more. leve key on when light stops flashing starts up. i replaced ignition cyl. and relern comuter. got part from dealer and new key from dealer. j... Trouble codes: P1629 (theft deterrent no signal).	View
	1987 Other GM Coupe 5.0L TCC solenoid The Avanti factory purchased NEW '87 Monte Carlo SS, removed body and installed their body. PROBLEM: At 60 mph on interstate TCC solenoid will keep turning on and off. Do not notice any problems with TCC solenoid below 60mph. Scanner shows road speed constan...	View
	1994 Pontiac Grand Prix 3.4L power antenna Greetings. Looking for schematic for this power antenna setup. It is the non relay oonfig (coupe). Alldata and Chiltons only provide for the relay config (sedan). The connector at the antenna motor has org, drk grn, and blk wires. Org is always hot driving the...	View
	1998 Pontiac Grand Am 2.4L Stall hey guys i have a 98 grand am that is driving me insane it will stall when the cooling fans come on just sitting idling if you idle it up it will just stumble a little or it will stall when driving and come to a stop. i replaced the cooling fan cause i thought...	View
	2001 Saturn LW300 3.0L MIL Lamp on eng service light on, eng and driveability ok, passed e-test with flying colours, otc scanner shows that the pre - cat o2 sensors are not working ( we checked connections ok)customer reluctant to put in 2 $475.00 o2 sensors. what puzzles us is if these o2 sens... Trouble codes: PO151 (heated o2 sensor low voltage bank 2 sensor1).	View
	2002 Saturn Vue 3.0L coolant hello all, i,m here just trying to establish a starting point on this 1..i just aquired this vue.it has coolant in the radiator & it looks like it has been overflowing for a while..it was a trade in at a local used car dealer,& i got involved in this my by my ...	View
	2003 Saturn Vue 3.0L Steering Wheel The vehicle came into my bay with problem with the steering being to hard. This vehicle is equipped with an electronic steering with module. When you start the vehicle up the steering is too hard, if you restart the vehicle the steering becomes light again. Th...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre 3.8L Hesitation, bucking THANKS TO ALL THAT OFFERED HELP. FINALLY AFTER TRYING IGN MODULE AND CRANK / CAM SENSORS AND CHECKING WIRING WE INSTALLED A COMPUTER WHICH SOLVED THE PROBLEM Trouble codes: po341 (intermittant cam sensor signal), po342 (cam sensor failure).	26
	1997 Chevrolet Pickup 5.7L abs Thanks for all the help I finally fixed this one after replacing brake hoses and rotors and pads	17
	1998 Chevrolet Pickup 7.4L fuel gauge erratic What we had was an intermitant tank sensor in the rear tank. We checked the ohms when it was acting up and found 10,000 ohms on the rear tank when it should be 40 to 250 ohms. Trouble codes: P0462 (fuel level sensor).	3
	2003 Chevrolet Silverado 4.8L Traction control light We deliver the vehicle this way , customer is supposed to bring it back to check the other issue. We check back with the dealer and we had the right part.	3
	2005 Chevrolet Express 5.3L MIL Lamp on, Extended Cranking as we thought pcm did fix after the ign feed (orange) chafing was repaired. still haven't had a chance to open up the old pcm to check it out. thanks guys. -J Trouble codes: P0342 (cmp low).	5
	2003 GMC Yukon XL 5.3L Hesitation Thanks for all the emails, however I still have not been able to fix this vehicle. I have inspected for vacuum leaks several times both when cold and hot. I have disconnected the MAF to see if it runs any different and it does not. At this point I am going ...	12
	2003 GMC Sierra 6.6L transfer case FINALLY FOUND A PINHOLE THAT WORE THROUGH THE CASE FROM THE PUMP. THE THING THAT THREW ME OFF WAS THAT THERE WAS NO EVEDENCE OF OIL ON THE OUTSIDE OF THE TRANSFER CASE, IT WAS PERFECTLY CLEAN AND DRY. BRENT FROM MICHIGAN NAILED IT BY SAYING THAT THE TRAC 2 FLU...	6
	2002 Oldsmobile Alero 3.4L No Start ok, One of my replies stated to check bcm codes. Thank you for that. In my personal diagnostic procedures I have " scan all modules" as a part of the troubleshooting chart. I came to realize one of the three bcm inputs was inactive on the tech 2 scanner. Trace...	7
	1989 Pontiac Firebird 5.0L Poor Idle Quality, Surge, Stall Hello thanks for all the help, it turned out that fuel hose from the pump to the pipe in the tank had deteriorated and was perferated causing the flow rate to bypass we replaced the pump and the sender assembly and that fixed the car. thanks again!	9
	1996 Pontiac Bonneville 3.8L No Start, Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy Thanks to all who replied , it as was the ground connector on the left kick panel that was the cause . It was green and coroded . After cutting all the wires and connecting them back to a good ground car was running again .	15

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