GM Automotive Technicians Technical Discussion and Fixes for Mar 13, 2014 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick LeSabre Custom 3.8L Idle VIN: 1G4HP52K1V vehicle imediately revs into high idle at start up all componants are scoping out ok maf sensor ohms out ok mass air flow sensor working correctly any suggestions	View
	2001 Chevrolet Suburban 1500 5.3L Catalyst monitor VIN: 3GNFK16T81 Hi guys i replaced catalytic convertors due to code po420, i have driven car probably 50 miles still won't run catalyst monitor. Alldata says to drive car at 55mph for 5 minutes, then decelerate to zero miles per hour without touching the brake. This is very ... Trouble codes: P0420 (Catalyst effencincy)	View
	2004 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDS13S04 This vehicle has been maintained by me for many years and am very familiar with it. The customer has never been able or willing dont know which, to leave it with me for any considerable amount of time for testing. I only got it to act up once and it is only in...	View
	2004 Chevrolet Monte Carlo LS 3.4L Gauges VIN: 2G1WW12E64 This vehicle is back, same problem with erractic speedometer. This time I pulled and replaced stepper motors myself. Did 3 of the 4 (gas gauge was ok) that were misreading. Re-assembled, and speedo still erratic in lots of different ways. I suspect its the VSS...	View
	2007 Chevrolet Tahoe LTZ 5.3L No Start, Poor Idle Quality, Stall, MIL Lamp on VIN: 1GNFK13017 Vehicle came in no start, found crank, start, stall then just cranks.Fuel pressure 55psi no theft lights or codes. Replaced gas soaked spark plugs, same no start condition,found if hold W.O.T. vehicle will start and run very rich. Cold KOEO coolant temp 12F, I... Trouble codes: P0175, C0561	View
	2008 Chevrolet Cobalt LS 2.2L Mechanical VIN: 1G1AK58F88 ALL DATA shows .8 FOR TEMP DOOR) DEALER says only way to get temp door is whole case half? heater core is 7.9hrs but recirc door is 5.9 Need a labor verification Please.	View
	2009 Chevrolet Impala LS 3.5L misfire on cylinder 3 VIN: 2G1WB57K19 switch injectors, checked injector pulse, switched plugs, checked for spark on cylinder 3, all was ok. checked injector wiring, all injectors had 13.6 ohms. used injector cleaner per gm request did not fix.	View
	2011 Chevrolet Express 4500 6.0L No Start, Stall This problem original occurred about 2 months ago. At that time the problem was found that the engine was getting no fuel. The power at the fuel pump fuse was there. When we called GM for a fuel pump, the parts guy suggested we change the fuse box 1st. When th...	View
	1995 Geo Prizm LSi 1.6L No Start VIN: 1Y1SK5263S ok this one was towed into me with a no start condition. The first thing I do is check for spark and injector pulse. I have neither. Then I pulled the distributor cap and see if the rotor is turning. It is so I check to make sure total timing is right and its ...	View
	2006 Hummer H3 3.5L Poor Idle Quality, Misfire, MIL Lamp on, Reduced power VIN: 5GTDN13606 Ok GM guys need some input. Vehicle came for a water pump customer stated when he tried to drive it to us it was running bad and will not go over 40 mph. when i started it it was running good drove and accelerated good pulled codes mil codes P0030,P0036,P2101.... Trouble codes: P0030 (O2 heater control bank 1 sensor 1 P0135 heater performance), P0036 (O2 heater control bank 1 sensor 2 P0141 heater performance), P2101 (throttle actuator position performance), P1516 (throttle actuator control module throttle actuator position performance), P1682 (ignition 1 switch circuit 2), P0300 (misfire detected)	View
	2000 Oldsmobile Intrigue GX 3.5L engine VIN: 1G3WH52H4Y Customer came in with engine over heating. Did a block test and it failed. Had machine shop check heads and they were warped. Heads were tested and milled. Some bolt holes in block needed heli coiled so I took block to the machine shop since I knew they were m...	View
	2002 Saturn L300 3.0L abs module VIN: 1G8JW54R52 Vehicle came in with low traction light coming on & abs pump engaging when starting to accelerate only when car is cold.Already replace left front abs sensor because it was reading erratic, & replaced both front axles because both tone rings severely rusted.Ve...	View
	2004 Saturn Ion-3 2.2L Excessive Emissions VIN: 1G8AL52F54 Car Came In With Running Rich Complant. We Tested Sensor Reading And Fuel Trims Will Go From One Extream To The next. Seen As High as -50 on Short term Fuel trim. ( Seems Only to go that High On Acceleration). At Times ST Trimn Reading Will Drop To + 20 ( Usua...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2006 Buick Lucerne CXS 4.6L ignition switch VIN: 1G4HE57Y36 The Body control module fixed this one. this was a side post battery. The cables would not reach the wrong posts. I can only guess the doors being open or the key being in the wrong position shorted the BCM. In my research I found TSB's referring to wiring har...	10
	2007 Chevrolet Silverado 1500 LTZ 6.0L oil pressure VIN: 1GCEK19Y77 I bypassed the engine oil cooler and now the oil pressure stays above the minimum. The truck was brought to me to install for the re builder of the engine. He has decided to run it like this. I think there may be a leak at the lifter manifold. I am going to pa...	10
	1998 GMC Jimmy Envoy 4.3L Excessive Emissions, ECM Monitors VIN: 1GKDT13W3W Thanks to all who responded, and so sorry for the delay to close this. We basically had to drive the hell out of this vehicle. We ran all the monitors and passed the emission test.	6
	2000 GMC Savana 1500 5.7L Engine VIN: 1GDFG15R8Y After doing a compression test, injector pulse test, checking for misfires, changing harmonic balancer, and disconnecting torque converter and nothing changed the place we purchased the engine decided to ship another engine. Fixing to install soon. Thanks fo...	26
	2012 GMC Terrain SLE 2.4L MIL Lamp on VIN: 2GKALMEK1C The car has not returned and I can only presume that the owner took it to the dealer as the vehicle is still in warranty. My best guess that it is the cam actuator itself causing this intermittent problem. Thank you,John Trouble codes: P0014.	7
	2007 Pontiac G6 2.4L Electronic steering VIN: 1G2ZG58B27 The steering problem was caused by a faulty steering torque sensor which is only serviced with the steering column assembly. Replaced the steering column, then caused an air bag fault, by not pushing the plastic tabs in securely enough on the air bag, pushed t...	14

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