GM Automotive Technicians Technical Discussion and Fixes for Dec 11, 2007

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	Help Request	Answers
	2002 Buick Regal LS 3.8L Turn signals VIN: 2G4WB52K32 Thanks in advance. Car came in for complant of the starter making noise. We ended up shiming the starter which took care of the noise.(car starter fine about a dozen times) Customer came in next day to pick up car. When we went to start it the dash lights were...	View
	1997 Cadillac Seville STS 4.6L Oil pressure warning VIN: 1G6KY5290V Hi everyone. The oil pressure warning system is going of on this car for no apparent reason. I replaced the sender twice, the first time with a Carquest one the second with an OEM one. When that didnt work we put the manual pressure gauge on it and got fantast...	View
	2002 Cadillac DeVille DTS 4.6L ignition lock VIN: 1G6KF57992 Hi all. The car is a 02 cadillac deville DTS 4.6L the car will not start and the key will not come out of the ignition, like it isnt in park. scanner will not communicate with the vehicle, no power to the starter. the diagnostic flow chart says to check for p...	View
	1990 Chevrolet K2500 Cheyenne 5.7L Hesitation, Cuts out, Stall VIN: 1GCGK24K7E I hate to post this but this pickup is kicking our butts. This vehicle often pulls a gooseneck stock trailer and last winter it would start to loose power, buck, spit back and just go slower and slower until it would just barely idle. The customer said that if...	View
	1995 Chevrolet Caprice Classic 5.7L front brakes VIN: 1G1BL82P7S thanks to all who reply. have this caprice wagon in shop for front brakes locking when driving down hwy. installed both front brake hoses one week ago and all seemed to good for a few days. then front brakes begin to lock up without applying brakes. have not b...	View
	1999 Chevrolet Tracker 2.0L Surge VIN: 2CNBE13C4X I tried a basic tune up, engine felt like maybe a misfire when I snap throttle in park just off idle, but does not feel like a misfire when driving, more like a surge at cruise. I checked the spark plugs and #1 plug porcelin looked a little different than the ... Trouble codes: P0455	View
	1999 Chevrolet K3500 6.5L cruise control VIN: 4TGB162066 This truck has us stumped. The cruise control will not work. Have checked the brake switches, cruise control swiches. powers and grds at the pcm. All inputs to the pcm are working from all the swiches as they should. We concluded it must be the pcm so we got o...	View
	1999 Chevrolet Tahoe 5.7L Cuts out VIN: 1GWEK13ROX Dear iatn member i have a 99 tahoe that stumbles or cuts out around the time the tcc locks up. When this happens it seems worse when you start letting off of the throttle. I can duplicate in the stall. When i duplicate the problem i torque the engine to about ...	View
	2001 Chevrolet Prizm 1.8L fuel filler This customer brought this car in with a complaint of fuel kickback when filling tank. I can find no restrictions of any kind. I removed the tank and checked the inlet and inlet check valve. Out of desperation I replaced the two in tank check valves. I hate to...	View
	2003 Chevrolet Monte Carlo SS 3.8L Unknown VIN: 2G1WX15K93 Thanks in advance for everyone taking the time to read and hopefully help me out with this one. When driving you get a "humming" noise from the vehicle, seems to be the right front, but??? Raised vehicle up and hub seems tight, no noise when turning or running...	View
	2004 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEC13T64 any help on what Iam over looking. thank you in advance. this truck came from other shops,including the local dealer. I have p0300 dtc, modis miss fire monitor shows #7 and#2 cylinder miss fire.swiched spark plug, plug wire,coil, fuel injector to another cylin... Trouble codes: P0300 (random cylinder missfire detected)	View
	2004 Chevrolet Silverado 1500 5.3L fuel tank VIN: 2GCEK19TX4 it would take one hour to fill fuel tank. no restriction in filler neck hose. it is like it is holding pressure and have no explanation as to why. no codes present. starts and runns great. any help would be great.	View
	1987 Oldsmobile Delta 88 Royale Brougham 3.8L No Start, slow to fire up VIN: 1G3HY5137H Vehicle towed in, after sitting for a long time, with no spark, sometimes would run for a few seconds then quit. Found a mouse nest on firewall with no wire damage due to it, after looking at cam and crank sensors wave forms all looked good I guess. We replace... Trouble codes: 43 (EST failure)	View
	1993 Oldsmobile 98 Regency 3.8L radiator VIN: 1G3HN5318P vehicle came in with trans fluid in radiator,check trans fluid and it was low replaced radiator thinking the cooler was leaking through put new hoses on cause they were swollen.she drove the car for 2 months and put on 3,000 miles and came back in with the sam...	View
	1998 Oldsmobile Bravada 4.3L temp blend door VIN: 1GHDT13W4W Hello everyone. I replaced the heater core in this Bravada due to a leak. After the work was completed, the temperature blend door actuator will keep cycling from cold to hot. The actuator sounds noisy and will occasionally stop in one spot, I can tap it and i...	View
	1999 Oldsmobile Cutlass GL 3.1L lifters VIN: 1G3NB52M7W After i finished the job and turned on the vehicle, one piston had no compression, but i noticed that it was the lifter that was lifting the pushrod too much. When i loosen the rocker arm on that piston the compression matches the others. I did the same with t...	View
	1999 Oldsmobile Bravada 4.3L low pedal VIN: 1GHDT13W9X GM brake techs I need help .I have another s vehicle here with a low pedal.i cringe every time I work on the brake lines on one of these.Owner complained of low pedal,when I moved it in the shop the pedal was good I pumped it a few times to see if the master w...	View
	2000 Oldsmobile Intrigue GX 3.5L Starting VIN: 1G3WH52H8Y this one is highly intermit, after replacing both cam and crank sensors with factory parts, still tyhe same problem and a reoccuring code p340. all connectors look ok any help would be appreciated btw after one no crank turning the key again it will start for ...	View
	2000 Oldsmobile Intrigue GLS 3.5L engine temp VIN: 1G3WX52H8Y car came in with complaint of overheatind after being ran for 6-10 miles, test drove car, confirmed complant, after 6 miles temp gauge creeps up past 240, check gauge light comes on, pulled car over to let cool, comfermed temp with scanner installed, replaced ...	View
	1999 Pontiac Firebird Formula 5.7L loosing oil pressure VIN: 2G2FV22G8X We proceded to disassemble engine- lower oil pan to check for stopped screen or trash in pan- no bad problems found- replaced oil pump, tchain-(oil pump is on front of engine) as well as other needed repairs- full tune, serp tensioner, belt, - vehicle has grea...	View
	2000 Saturn SL2 1.9L Stall VIN: 1G8ZJ5274Y Good Morning fellow techs, This Saturn is making my customer upset. His story is that when he is driving and pushes in the clutch, the engine speed drops to about 400 RPM. Of Course that will cause it to stall if there is any load (i.e. A/C, high generator loa...	View
	2002 Saturn Vue 3.0L No Start, Stall, MIL Lamp on VIN: 5GZCZ63BX2 thanks in advance , this vehicle would shut off at idle in park , hot , intermitantly ,no check engine light on. the customer decided to take the vehicle back . he pulled out side the shop,& left it running . he then opened the drivers door & it stalled . the ... Trouble codes: P2176	View
	2002 Saturn L300 3.0L lifters VIN: 1G8JW54R42 incredibly noisy lifters on front and rear. done and oil pressure test, pulled cooler lines checked for obstructions, pulled valve covers, did oil change. possible for numerous lifters to be bad. first did the oil change and found back half of oil filter from ...	View
	2003 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ23D63 Vehicle came in check engine light and power loss light on. codes stored p0453 p0463 p1635. Fuel guage also inoperative. fuel guage indicates empty with full tank. Customer states this all happened at once,possibly after using a trickle charger to maintain bat... Trouble codes: P0453 (fuel tank pressure high voltage), P0463 (fuel level sensor high voltage), P1635 (5 volt reference circuit 1)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Park Avenue 3.8L low coolant message VIN: 1G4CW52K9Y Thanks to all who replied to my reguest.All agreed that sensor should be in right side of rad.As I stated in my request the sensor is not there.I removed enough items to see the rad. clearly.No wires visable that may go to sensor.Customer has been to other sho...	17
	2003 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K43 Thanks for all your help! I finally did find the fault, the harness on the O2 sensor had a spot that was worn through that I did not see the first time I looked at it. I cleaned the connector and replaced the O2 sensor and all is good. I feel like whipping mys... Trouble codes: P0140 (O2 sensor 2 insufficient activity).	4
	1997 Cadillac Catera 3.0L brakes VIN: W06VR52R0V thanx for everyones help. lower control arm bushings were damaged and causing this unusual problem. after replacing horizontal & vertical bushings in r/f & l/f lower arms & aligned problem solved. thanx again!!!	15
	1998 Cadillac Catera 3.0L No Start VIN: WO6VR52R1W What a mess, this one is fixed hope I never never see this again. As I have been doing this for 35 years. Thanks for all the post's. The fuel lines were reversed at the fuel tank "by the customer when he installed the first pump" not telling anyone. I guess I ...	7
	2003 Cadillac CTS 3.2L Cabin heating VIN: 1G6DM57N93 Well, I never experienced the smoke coming through the vents but the camshaft cover gaskets were leaking severely out of the Pside, did the spark plugs as well. Oil had filled both rear SP bores. When I pulled the Tstat I tested it in hot water and sure enou...	9
	1988 Chevrolet G30 Chevy Van 5.7L cruise control VIN: 2GBJG31M4J Thank you for the replies and advice. The cruise module was located on the parking brake bracket. I tested it and it was good so I tested for vehicle speed signal and had none. Tested and replaced vehicle speed sensor buffer on back of the instument cluster...	5
	1993 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 2GCEC19K8P Fixed Vehicle by Flushing injectors and replacing throttle body gasket	8
	1995 Chevrolet K3500 7.4L Converter VIN: 1GBHK39N4S Thank you to everyone who replied, I really appreciated your assistance! The solution to the Shift Solenoid B error was: Speed Sensor replacement. It took care of the torque converter going in & out of lockup & the Neutral-2nd gear-to not shifting problem. P...	13
	2000 Chevrolet Silverado 1500 5.3L Mechanical VIN: 1GCEK14W9Y I won't to thank everyone who took time to reply to my question. I realize this wasn't a normal problem but I just wanted to get a different take on the situation. AS I figured, the consensus was that mechanically speaking, reprogramming won't help stopping di...	15
	2002 Chevrolet Silverado 1500 HD LS 6.0L brakes??? VIN: 1GCGK13U62 The customer took his truck to the local Chevrolet dealer who confirmed all brake and front end components were in good condition, confirming my inspection findings. The dealer tech suggested tire replacement and customer did replace tires. Customer reports ...	12
	2003 Chevrolet Trailblazer LT 4.2L lifter VIN: 1GNES16S43 We have already replaced the lifters with no improvement. The oil filter is correct with valve. We just put a used engine in this one to expedite the repairs. Thanks for the suggestions.	10
	2004 Chevrolet Suburban 1500 Z71 5.3L power seats VIN: 1GNFK16Z84 Want to think everyone for their quick responses.I think everybody was dead on. I took to a friend at dealer and he reprogramed seat module and it works perfect again.Thanks so much for the quick and courteous help.Still did not really come up with a reason it...	9
	1997 GMC Yukon SLE 5.7L prndl VIN: 1GKEK13R9V Thank to all replied. It got me looking at the switch and the circuit again, I was able to get a hold of a GM shop manual and the page that states which switches are on and off in any given gear. Although we had connection through the switch it must just not b...	7

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