GM Automotive Technicians Technical Discussion and Fixes for Oct 7, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2001 Buick Regal GS 3.8L Intake Manifold VIN: 2G4WF55141 This Regal GS Supercharged has a coolant leak somewhere around the upper intake or supercharger. It is all wet around the front injectors on top of the lower intake. I cant tell for sure where it's coming from.. I'm just wondering if anybody has seen this befo...	View
	2005 Cadillac CTS 2.8L Surge VIN: 1G6DM57T66 very good customer the dealer says they dont feel the promblem. when going 40 to 50 up hill at cruising speed i feel little jerking. give it a little moer petal it goes away. just wondering if any cad tech seen this before.her husband says drive it harder shes...	View
	1995 Chevrolet Camaro 3.4L Excessive Emissions VIN: 2G1FP22S0S This car is failing emissions with high NOX. Supposed to be below 421 but it is 865. I tested the EGR valve and all three solenoids click, freely move and when I trigger them the engine reacts but does not stall – when I trigger the smallest orifice it hardly ...	View
	1997 Chevrolet Cavalier 2.2L radiator coolant flow i need your help .i cannot send this car out this way , engine gets to proper operating temps but the rad does not , changed rad , thermostat , hoses , new headgasket when engine replaced (engine lower end 2001 sunfire 2.2 vin 4 and head from the 1997 cavalier...	View
	1997 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC5241V Car has bad crank sensor, removing the bad sensor is my problem. The sensor is moving but it is hitting something solid halfway out, i put lots of pb blaster and tried to remove it but i don't want to break it off. I would like some thoughts on getting this se...	View
	1999 Chevrolet Camaro Z28 5.7L Poor Fuel Economy VIN: 2G1FP22G5X I have a 99 camaro im working on with an ls1 engine i pulled a p0132 and a p0152 code from computer both o2 sensors stay rich between 800 and 950 mv pulse width is 1.6 stft is 0 ltft varies from -10 to -15% both front o2 sensors have been replaced and b1s2 as ...	View
	2000 Chevrolet C3500 5.7L No Start VIN: 1GBGC34R1Y This truck has no power to the grey fuel pump wire at the connector & before connector. The ecmb fuse is good and I only get battery voltage from the prime terminal of the pump relay, I believe there should be voltage at 2 of the pump relay terminals. The ecm ...	View
	2001 Chevrolet Silverado 3500 8.1L valvetrain ?? VIN: 1GBJK39G91 This 3500 truck has a distinct rattle (sounds like valvetrain) from RH bank, starts at about 1500 rpm, quiets back down at about 1900 rpm. Changed oil & filter ran engine to operating temp with "BG quick-clean", drained oil, changed filter, refilled with "BG M...	View
	2003 Chevrolet Impala 3.8L compressor VIN: 2G1WF55K13 Please help with this one , a/c compressor has been replaced due to failure 4 times along with o tube and accumulator and condenssor, first one was replaced in feb of this year car came back less than a month later with compressor making noise that one lasted ...	View
	2004 Chevrolet Express 2500 LS 6.0L power window VIN: 1GAGG25U44 This 2004 Express came in for power windows in the down position and would not go up. I did some testing and found both motors to work in both directions when powered directly from motor feed wires at switch. Had both power and ground at switch. In mean time p...	View
	2005 Chevrolet Impala LS 3.8L abs VIN: 2G1WF52E85 This car is a real problem. It has been in before for the ABS/Trac control light on. Pulled codes and found the LR wheel speed sensor bad. Replaced Rear hub and bearing and cleared code. Problem solved! Two weeks later car returns with abs light and service tr...	View
	2005 Chevrolet Silverado 2500 HD 6.0L steering column VIN: 1GBHC24U45 hey all, we have a truck in our shop with a known common noise, which is the clunk in the steering shaft. well, we replaced that (intermediate shaft) not long ago. while under the dash i noticed quite a bit of play in the shaft where it comes out of the column...	View
	2007 Chevrolet C5500 Kodiak C5C042 6.6L Unknown VIN: 1GBE5C1287 Vehicle shakes 40% of the time under the correct acceleration from stop signs when vehicle reaches approximately 30 mph the steering wheel & vehicle shakes pretty severely until speed exceeds 50 mph at which time the vibration becomes acceptable. We have repla...	View
	2000 GMC Sierra 2500 SLE 6.0L O2 pattern VIN: 1GTGK24U1Y This is a fleet vehicle we have in for training purposes. We are trying to be efficiant at taking snap shots of the PIDs for PM purpose and for future referance. We are using our new Bosch VCI and Shop Foreman Pro software. We noticed while doing a service bay...	View
	2003 GMC Yukon Denali 6.0L abs module VIN: 1GKEK63U53 We have a traction active message on lite throttle at 20km truck hesitates and throttle cuts back for about [...] and then you drive out of it . Firm acceleration no problems , rolling start no problems.replace rf wheel brg very loose and replace lf sensor ...	View
	2000 Saturn SL 1.9L Misfire, MIL Lamp on VIN: 1G8ZH5285Y Need some advice guys. Had this saturn in with codes po410, po442, and po300. Found that po410 air pump code was setting light so tested and repaired, gave to customer and warned of possible light coming back on. Vehicle returns with codes 442 and 300. Tested ... Trouble codes: P0410, P0442, P0300	View
	2000 Saturn L200 3.0L bcm VIN: 1G8JW52RXY This thing will go dead overnight. If I cycle the key, pull the key out, open and shut the door, the draw drops to 76mA and will not go any lower unless I remove the BCM/Cluster fuse, put it back and then wait one minute. Then it will drop to 20mA. I've remove...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2005 Cadillac STS 4.6L remote start VIN: 1G6DC67A95 After spending alot of time troubleshooting, we concluded that the body control module needed to be reflashed, the customer decided to live with the remote start not functioning, if anything changes I'll be sure to update. Thanks for all the help.	5
	1965 Chevrolet C10 Pickup 3.8L Suspension Hello and thanks to all 7 members that replied.As mentioned in my original post that this is a resto\rod project,we have collected all info to find the necessary parts to install a later model front cross member\subframe.We have found through measuring and "ey...	8
	1994 Chevrolet Corsica 3.1L abs system VIN: 1G1LD55MXR installed a used abs unit and the customer has not been back, we are happy to have it fixed and solved , with a lot of thanks from my fellow iatn members, thank to all who took the time to respond , joe cat	9
	1997 Chevrolet Tahoe 5.7L mil is on VIN: 1GNEK13R8V It turned out to be O2 sensor bank1 sensor1, internally shorted. Appears to have nothing to do with our work, no evidence of it being struck or otherwise damaged from outside, I guess we were in the wrong place at the wrong time. I still don't fully understan...	10
	1998 Chevrolet Lumina 3.1L Excessive Emissions VIN: 2G1WL52M5W Many of you hit it on the head!! The charcoal canister was saturated with gas, therefore, affecting my fuel mixture!!! Also, found one more injector leaking. So far so good thanks to you all and customer has his car!!!	9
	1998 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEC14W0W the fix was using a running compression test that the fault revealed itself . # 3 cylinder yes # 3 has an internal issue ,possible cam shaft or improperly seated valve . customer refused the fix. thanks for all your help Trouble codes: P0122, P0135, P0147, P0300.	9
	1999 Chevrolet S10 2.2L starter, lighting VIN: 1GCCS1447X Thanks to all who replied, especially Kent who was kind enough to take the time to come by and help out. It was a ground inside the harness at a junction splice between the alternator and the ignition coils.	27
	1999 Chevrolet Express 3500 LS 5.7L Cuts out, MIL Lamp on VIN: 1GAHG39R1X Hi Guys, Just want to thank everyone who replied. My luck I got to go to a "standard automotive" training class on monday and tuesday nights in columbus Ga.(I'm in LaGrange, 50 mile drive)(didn't get home till 11:45 pm) wednesday morning used some of my new an... Trouble codes: P0339 (Crank signal).	21
	2009 Chevrolet HHR LS 2.2L air bag light VIN: 3GNCA63X19 First of all - [thanks for the replies you guys] I was lost here. These cars are getting more complex every year.Eric from Mich and Dave from indiana who said to replace the module and then reprogram the module were 100% right,there was no other option for th...	4
	1997 GMC Safari SLT 4.3L power steering, VIN: 1GKEL19W8V Thanks to all the techs that replied, After 3 ps pumps and one gear box. I replaced the remanf. pump with a new from GM. Problem solved. Thanks guys.	12
	1998 Oldsmobile Bravada 4.3L Cuts out VIN: 1GHDT13W4W I want to thank everyone who replied, I replaced the ignition switch and have not heard back from the customer. No news is good news. I took the old switch apart and found evidence that one of the switch contacts was getting hot and the contact points were bla...	18
	1997 Pontiac Grand Prix SE 3.8L speedometer VIN: 1G2WJ52K3V PCM fixed it as most replies suggested. Some also mentioned to check for aftermarket radio for speed controlled volume signal being pulled down causing loss of speedo. This car didn't have that feature from looking in the owners manual. Had good VSS inp...	7
	2004 Pontiac Montana 3.4L dash lights VIN: 1GMDU03E14 Hi,thanks for the responses. I finally got this van back to check again re. no dash lights. What i found was a short to ground in the grey wire (variable dim output from switch) in the passenger power window switch illumination. There were no blown fuses becau...	4
	2005 Pontiac Montana SV6 3.5L Unknown VIN: 1GMDV03LO5 This vehicle has been sent to dealer to have bcm installed and programmed. Bcm was receiving signal from ignition switch but would not shut vehicle off. Thank you to all the replied.	5
	2000 Saturn SL1 1.9L Shift cables VIN: 1G8ZG5285Y Thanks for all of the replys. We retested engine & body grounds and did not find a problem. The customer did not won't to go to the expense of going into the tranaxle to check for problems. The transmission did not have any obviouse problem when shifting. We i...	12

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