iATN Member GM Auto Repair Tech Exchange for June 13, 2008

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Open Help Requests for GM

	Help Request	Answers
	1993 Cadillac Eldorado 4.6L MIL Lamp on Hello fellow mechs. I got one for the cadillac guys. P041 NO CAM SIGNAL, sets as soon as you start the car. I tested the sensor for a ac signal with the Modis scope. It had no signal. I had 1.6k ohms of continuity with the connector unpluged and and probed thr... Trouble codes: P041 (no cam signal).	View
	2002 Cadillac DeVille 4.6L MIL Lamp on Thanks to everyone for your help in advance!! I have this 2002 Caddy here that is giving us fits!! It keeps setting a P1415 Secondary AIR problem on bank 1. Another shop has replaced the check valve and tube. I have repalced the bank one sensor one oxygen sens... Trouble codes: p1415 (secondary air bank 1).	View
	1985 Chevrolet Monte Carlo 4.3L coolant,oil pressure guage well for the oil pressure guage was reading normal than all of the sudden says 0,when driving guage moves a little bit up to 30psi then normal stopping at light goes back to 0,my guess switch went bad,guage works good.ok now for coolant loss ,when going to wor...	View
	1994 Chevrolet Blazer 5.7L abs lite Hello: This should not be driving me crazy but it is.Vehicle came in with abs lite on checked for codes had codes 25 26 28 all pertaining to lf speed sensor,verfied no speed sensor signal on lf found harness and sensor bad replaced and now i have correct signa...	View
	1995 Chevrolet S10 Pickup 2.2L ignition system i have just tuned up this customers vehicle and everything was running good and she then came back because she said it was sputering on her. so i checked everything to make sure that everything was connected properly and ti was. i tedt drove it to make sure th...	View
	1998 Chevrolet Express 5.7L Poor Idle Quality, Surge, MIL Lamp on, low power Hello guys, and thanks for looking at this one. First off the van came in with a CEL and low power. Test drove van and seen the O2 sensors on both banks were reading lean under acelleration from a stop. 200-350mv, and noticable low power. However if you are go... Trouble codes: P1153 (bank 2 sesnor1 not switching).	View
	1999 Chevrolet Silverado 6.0L Hesitation, Cuts out truck has bad hesitation on first 5 or 6 accelerations from stop. after warm very slight hesitation. checked tune plugs good fuel pressure to spec checked for pluged cat 1psi at 2500rpm both banks. no codes in ECM replaced intake because of simlar posting did ...	View
	2001 Chevrolet Suburban 5.3L lack of power this suburban is my personal vehicle that i bought to pull a 6500 pound camper. the tow rating is 7700 pounds. the truck seems to lack power on slight hills and will not go much over 60 mph. with nothing in tow the truck is fine. all sensors read normally. i w...	View
	2001 Chevrolet Monte Carlo 3.8L Compressor, PCM Hello fellow tech's, This one has me stumped. All pid data shows the system should run. I can jump the a/c relay control ck to ground and activate the clutch. I can't activate the clutch using the command function from the scan tool. Say's inncorrect or improp...	View
	2001 Chevrolet Silverado 6.0L Rear Main Seal I pulled this engine out in order to do the rear main seal and housing gasket because it's a 4X4. I bought all O.E. parts for it including a water pump assy, oil pump, pick up tube "O" ring, timing cover gasket, front seal, rear main housing gasket, & the rear...	View
	2001 Chevrolet Lumina 3.1L MIL Lamp on This car came in from the inspection station. I scaned and got a p0446 Evap system vent controll and a p0442 Evap system small leak detected. I pulled charcoal canister down and checked out the vent solonoid and found the filter was full of dirt and debries an... Trouble codes: p0446 (evap vent control problem).	View
	2001 Chevrolet Monte Carlo 3.8L No Start, Stall Vehicle stalls or very low RPM.Traction light comes on at cruise, engine bucks, light goes off, come to a stop and vehicle stalls. Hard start,starts with very low idle, no power.Traction light does not always come at idle/stall.Thinking the traction light come... Trouble codes: C1276 (Traction control).	View
	1996 Oldsmobile Achieva 3.1L No Start, Stall This car starts and imediatly stalls. Has codes 1573 and 1629 that are reocurring. Car will eventually start if repeatedly attempted. Ohmed ciruit 800 "UART serial data line". Circuit OK. dont really know what direction to go in... Some experience in these old... Trouble codes: p1573 (Lost Communications with BrakeTraction Control EBTCM System), p1629 (Theft Deterrent Fuel Enable Signal Not Received).	View
	1998 Oldsmobile Intrigue 3.8L Poor Idle Quality, Surge, Stall, Excess crankcase vac This thing has huge suction in the crankcase, reads 6HG on the gauge when put on the dipstick tube and pulling the dipstick only slightly reduces the sucking noise at the crankshaft seal (YUP) sucking air in through the front crankseal. Runs really rough when ...	View
	2001 Oldsmobile Aurora 3.5L Starting I hope I am just overlooking something here. The vehicle came into the shop with the starter hanging up slightly at startup giving a slight grind almost everytime. After doing a few simple tests for voltage and ground our other mechanic put in a new starter. A...	View
	1967 Pontiac GTO 400CID Key tumbler Hi Guys, I do alot of work and restoration on older classics because I'm one myself. My question is a simple one. Has anyone have an idea as to how to remove the key & tumbler out of the ignition switch when it doesn't want to come out in the normal way? I...	View
	1994 Saturn SL 1.9L MIL Lamp on Howdy folks , I got this older Saturn SL here . It is only in for no ac operation . Nothing else wrong with car except for intermittant Check engine light . Scanned pcm has codes 26 and 27 (quad driver faults) Checked ac system , no mechanic problems found . C... Trouble codes: 26 (quad driver failure), 27 (quad driver fault).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on First thank you to all that replied, Kevin from Michigan and Steven fron Idaho nailed it right away the plenum boot that hooks the intake to the throttle body housing was cracked. Common part at the dealer. Thanks again Trouble codes: PO171 (Lean Bank 1), PO164 (Lean Bank 2), PO335 (CKP No Circuit), PO300 (Engine Misfire).	7
	1989 Chevrolet Camaro 5.0L No Start, Poor Idle Quality, Surge 89 Iroc. To recap this vehicle came into the shop with a request from the customer to replace cap, rotor, and wires and replace the plugs. After doing all this vehicle still was running rough and would fall on its face at full throttle. So then I start lookin...	7
	1991 Chevrolet S10 Pickup 2.5L No Start THANKS FOR ALL THE HELP WELL AS MOST SUGGESTED WE REPLACED THE COIL AND SEEM TO HAVE FIX THE PROBLEM. THANKS AGAIN.	17
	1997 Chevrolet Lumina 3.1L No Start Hi, As of right now it seems to have been the PCM shutting down when it got very hot. When I looked at the wiring diagrams it turns out that the fuel gauge wiring goes through the PMC. That is why the gauge was going to full whenever the engine stalled. I had ...	16
	1998 Chevrolet Malibu 3.1L No Start Thanks for all the information. I removed the car starter and have had no issues in about a month thanks	14
	2000 Chevrolet Monte Carlo 3.8L compressor Hi, I want to thank everyone once again for their help. It ended up being a bad BCM. Soon as it was replaced the compressor fired right up. Thanks again to everyone.	12
	2003 Chevrolet Corvette 5.7L SDM Module Thanks to all who submitted replies to this help request. All were justified however I had already attempted to perform the suggestions that were submitted. Being the fact that the module had been purchased from a local dealer, I advised the owner to take the ...	4
	2002 Pontiac Grand Am 2.2L slave cylinder This car is finaly fixed today. Just like I had stated there is no clutch fork in this trans. It has anouther hydaulic assembly inside the bellhousing that is separate and different than any thing I've ever seen. It has anouther slave and hydraulic throw out b...	7
	2003 Pontiac Vibe 1.8L abs Thanks for all of the replies! I've checked and rechecked all of the inputs to the EBCM, checked the connector and pins, and came up with a defective new EBCM. I've replaced it again and now the car is perfect. ABS lights are off, and the ABS is working. Anoth...	2

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