iATN Member GM Auto Repair Tech Exchange for March 21, 2008

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Open Help Requests for GM

	Help Request	Answers
	1993 Cadillac DeVille 4.9L Excessive Emissions, Misfire we can't get this cadillac to run right it won't go into closed loop and cylinder #3 and # 8 have miss fires due to fuel (too much) not too sure where to go next on this.	View
	2002 Chevrolet Cavalier 2.4L engine hi all hope you can help we are bald from pulling our hair out. this car came in with a leaking head gasket it was running fine. we removed the head and sent it out for repairs it was presser checked and the valve were reground. the head was resurfaced. we too...	View
	2003 Chevrolet Silverado 5.3L master cyl First I must tell you this truck is a repairable. Have no idea if the brakes were like this before the accident or maybe it was why it was in an accident. The truck was hit in the right front. The problem is it has a low brake pedal and does not want to stop w...	View
	2003 Chevrolet Suburban 5.3L A/C tentioner a/c is cold and pressures look good and No cycling issues the problem we have on this unit is that the tentioner will vibrate/rattle when engine is reved up above 2500 rpm in gear or in neutral it actually ratchets to the stop causeing the noise. what do I do ...	View
	1994 Geo Metro 1.0L Exhaust Valves Dear Techs, I have this geo that don't like going away. Customer first had towed in at 172,725 miles for no start. Found timing belt broken. Replaced timing belt, ended up pulling head because cylinder #2 exhaust valve was bent. Everything went fine until Octo...	View
	1995 Geo Tracker 1.6L Hesitation this car came in with no power, hesitation. started with tune up, now the power is back but hesitation seems worse heres what happens if i feather the throttle it will rev ,if i dump the throttle fast it falls allover its self seems like it only runs on one cy...	View
	2005 GMC Yukon XL 5.3L Steering CO455 - C0550 CODES WERE IN HISTORY; CUSTOMER COMPLAINT WAS "several lights like ABS and ESC were flashing a couple days ago, then quit. thought I should get it checked out". "SERVICE STABILITY" IS ON INFORMATION CENTER DISPLAY. CLEARED CODES AND TEST DROVE, C...	View
	1988 Pontiac Fiero 2.8L No Start i ran the check off shopkey for no start. check spark at 2 wires none. installed noid light and no light during crank. go to chart a-3 ign on check for power at both terminals on injectors yes. disconect 4 way conn at module touch harness con. at terminal 430 ...	View
	1994 Pontiac Bonneville 3.8L battery Battery intermitant discharge to 7 volts. You can drive the vehicle between 1-3 weeks at a time,then at any time when the vehicle sits for 6-10 hours the battery is drained. No interior/exterior lights and obviouly no crank on engine. Very hard diagnosis,knowi...	View
	1996 Pontiac Grand Am 2.4L No Start Hi Folks: This car was towed to me after another garage could not figure it out. It was driven to that garage. I was told by the owner it ran very poorly. He said it skipped and had no power. While at the other shop, the condition deteriated and now it will no... Trouble codes: P0300 (interm misfire).	View
	1993 Saturn SL2 1.9L Excessive Emissions This car has me stumped. The O2 sensor pattern at 700 rpm idle is a cycling .3 to .8 volt pattern of 140 ms from bottom to bottom which I suspect to be a lean injector or two. The pattern at 15 mph is a dirty signal but is switching from rich to lean. At 25 mp...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Cadillac DeVille 4.6L controls Thanks to all who replied.I replaced the temp. actuater and that took care of the problem.	4
	1995 Chevrolet Caprice 5.7L No Start well, this one is fixed. turns out that when it would'nt start, we also had no injector pulse, or fuel! power to everything-NO GROUND! volt drop test revealed bad grounds,when it would run, it ran until it got warm enough for the connection to expand enough t... Trouble codes: 16 (lo res pulse circut).	16
	2005 Chevrolet Silverado 6.6L No power when cold This is an intermittant problem and have not yet confirmed a fix. Thanks for responding with the emails though. I am changing the Turbo Vane solinoid and I think that will fix the problem. Again, Thanks. James Trouble codes: P0045 (Turbocharger Vane Position Control Solenoid Control Circuit).	3
	1997 GMC Suburban 7.4L Drivetrain Thanks To All Who Replied, Sent Truck Back To Transmission Shop & As Most Of You Replied They Found Broken Snap Ring At Transfer Case Output Shaft. Don't Know How This Occured On A "Rebuilt" Transfer Case, But They Repaired It. Truck Has Been Gone For A Week N...	7
	1998 GMC Pickup 7.4L Poor Idle Quality, Surge, Stall, Misfire recieved three replies on this one-one suggested leaking fuel injectors-however the fuel pressure on this did'nt show any sign of leakdown,one suggested worn dist.bushing which i had already chkd when i replaced rotor,the last suggested unplugging timing conne...	3
	2003 GMC serria denal 6.0L Misfire, MIL Lamp on cked wiring at throttle body no problem found cleaned throttle body road tested 125 miles no ck lite but... thanks for the ideas mark Trouble codes: p0120A (tp sensor problem), p2135A (tp sensor problem).	4
	1994 Oldsmobile Cutlass Supreme 3.4L Unknown THANKS TO ROBERT FROM NORTH CAROLINA AND CHRIS FROM MISSOURI. BOTH SAID TO CHECK THE VACUUM BOOSTER HOSE WHERE IT CONNECTS AT THE BACK OF THE INTAKE. SURE ENOUGH IT WAS SOFT, SWOLLEN, AND OIL SOAKED. REPLACING THIS HOSE MADE THE BRAKING 10 TIMES BETTER. HO...	2
	1998 Oldsmobile Aurora 4.0L cooling system Head gasket is bad. I have the combustion gasses as mentioned, and the coolant shows up in the oil if it is run hard for an extended period of time. Customer neglected to tell me that he was losing two quarts of oil per month and only driving about 1500 miles ...	9
	1985 Pontiac Fiero 2.8L MIL Lamp on The nightmare is over. A search of all the local junk yards produced no '85 Fiero's for a donor ECM. The ECM is a one model-year only. I next was returning to ground zero and start completely over. I removed the PROM to see if the ECM would output a code ...	13
	2004 Pontiac GTO 5.7L stereo I learned that the only way to get this radio to work is with the tech2. the radio needs to be programmed to work with the vehicle it is being installed into. thank you for the 3 responses I recieved it is appreciated. Thank You Jim [...]	3

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