iATN Member GM Auto Repair Tech Exchange for August 26, 2008

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Open Help Requests for GM

	Help Request	Answers
	2000 Buick LeSabre 3.8L trunk release see above	View
	1999 Cadillac DeVille 4.6L No Start Vehicle came in for crank, no start. Please read entire entry, as i have performed many tests. B2750 and U1255 are hard codes in the IPC and U1255 in the SIR. I have good key with correct code. I have good resistance from pellet at ipc terminals and during cra... Trouble codes: b2750 (pass key data communication), u1255 (loss of data communication), p1631 (vtd password incorrect).	View
	1986 Chevrolet S10 Pickup 2.8L fuel gauge we could use your help. we replaced electric fuel pump on a 1986 chev.s10 truck.after the repair was made the gas gauge became erratic when brakes are applied.we dropped the tank again,& replaced fuel tank sending unit (same results) we checked grounds @ tank...	View
	1996 Chevrolet Pickup 5.0L speedo truck came to us with no gauges or shift indicator and trans would not shift. replaced ignition switch - gauges -indicator work - trans works but hunts to shift. prior to us getting it the speed sensor and conn. was replaced. problem is that speedo wont go pas...	View
	1997 Chevrolet Pickup 6.5L heavy black smoke Truck has heavy black smoke on acceleration and no power.A new lift pump was installed for no fuel psi,presure in spec with new pump.Pump timing was set to spec. Injector balance test all cylinders seem equal. With each cylinder disabled one at a time the engi...	View
	1998 Chevrolet Malibu 3.1L pump Hello, I am on my third aftermarket p/s pump now. Customer was driving, heard a growling noise then belt came off. I had replaced pump, pressure line, and belt six months to year ago due to slow leak. Put a warranty pump and belt on and bled. On my test drive ...	View
	2000 Chevrolet Monte Carlo 3.8L tcc ? I don't know which way to go with this one.I read tcc/pcs problems and valve body.Trans works fine to 3rd then shifts tcc rpms drop then when its time to shift the rpm's go up about 300-400 then stay .I can't tell if its not shifting 4th ( stripped splines ) o...	View
	1995 GMC Jimmy 4.3L No inj. signal cold Vehical tow in, won't start and surging when running, Ck fuel pressure ok 60psi, check spark ok, no injector signal at Dk/blue wire, turn key on & triggle ground signal several times, starts right up and drive ok no surging. If let it sits for 3o minutes to an...	View
	2002 GMC Yukon 6.0L abs Hey all and thanks so much in advance for your input. We have this denali that came in this morning. Seemed as though it would be simple!!! Go figure. Customer complained of low pedal and squeak in the brakes. Upon brake inspection , we confirmed a low but sta...	View
	2005 GMC Sierra 5.3L cyl heads Hello;My Fellows, We have a gmc truck in the shop with a overheating problem.We pressure tested it and found no external leaks.The truck was 1 gal. low on coolant.So we did a block test and right @ 212 deg. the color to our block test fluid changed color indic...	View
	1993 Oldsmobile Cutlass Ciera 3.3L Unknown This olds came in with a big oil leak out the front crank seal and making a scraping noise from front of engine. We replaced the seal and the leak quit, but the noise was still there. Removed the timing cover to look inside. The only thing we can find is that ...	View
	1999 Oldsmobile Aurora 4.0L Excessive Emissions, MIL Lamp on car came in the first time lazy sensor expected replaced sensor, no change. bank one changes good bank 2 at idle sits at 4mv, if you take car off idle it will become active and does respond if i create a rich condition any help would be appreciated. also passe... Trouble codes: p0151 (bank 2 sensor 1 slow response), p0153 (bank 2 sensor 1 low voltage), p0174 (bank 2 lean).	View
	2002 Oldsmobile Bravada 4.2L Stall im clueless on this one, the car was towed in for shutting off on the freeway, the car has starrted and run fine although im leary of driving it very far. there were no codes except c 326 (an abs code) the car is in very good condition and looks as though all ... Trouble codes: c326 (rear diff).	View
	2003 Oldsmobile Alero 2.2L ignition Gentlemen We have this Alero with a intermittent crank/no start condition. Now before you tell us to put a ignition switch in we already did this, than did the relearn and to be safe had our local GM dealer do it. Our problem started a few months back when we...	View
	2000 Pontiac Grand Am 3.4L ABS, TCS, Cruise Both ABS and BRAKE MILs are on. Code scan shows C1246 and C1286 are present. ABS, cruise and traction control are all disabled. Brake system works fine and all input sensors seem to function. New EBTSC module is $1000.00, so any other potential issues to check...	View
	2000 Pontiac Sunfire 2.4L High idle Hello all, We've got a sunfire here that idle's at 1500-2000 RPM. When we try to command the iac to idle down to 600 the lowest the engine will idle is 1200rpm. We have tried a known good iac and found no differance. we smoke tested the intake and found no le...	View
	2002 Pontiac Bonneville 3.8L Starting this vehicle has an intermittent no crank or delayed crank. very intermittent, sometimes cranks right away sometimes split second before it begins to crank sometimes 2 or 3 seconds. i have verified during no crank condition: no voltage to s terminal on starter...	View
	2004 Pontiac Grand Prix 3.8L engine We put a different engine in this car, it was a complete salvage yard engine. the problem is that it runs hot. I removed the thermostat housing and the water is right to the top I removed heater hose at the engine and have water there also. All hoses get hot. ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1982 Chevrolet Corvette 5.7L No Start Hey everyone. problem vette had 2 problems. replaced fuel pump and strainer and drained old fuel. reinstalled tank. car started! started about 20 times. installed breather and computer that was left in open to fascilitate testing...no start-no fuel pressure. n...	14
	1994 Chevrolet S10 Pickup 2.2L Front pump area Thanks to everyone that replied. This trans. was leaking at the front pump seal not out the vent or the dipstick tube. So it was not a overheating problem. I removed the trans. and replaced the front pump bushing even though it was within clearance allowances...	13
	1997 Chevrolet Blazer 4.3L Cuts out Thanks for your help, it's leaning towards a pump(fuel)replacement. The customer picked the vehicle(needed transportation), they will return too us another day. This will give me the opportunity to check voltages,pressures,and wave forms.	5
	2005 Chevrolet TrailBlazer 4.2L MIL Lamp on tested air valve on engine block, didn't open when cycled pumped on. replaced valve and retested and valve opened. thanks for all the help. Trouble codes: P0410 (secondary air injection system).	11
	2005 Chevrolet Aveo 1.6L oil pump Thanks to Dave from Indiana and Harry from Texas. This car is finally done. Knowing the correct specs is a good thing. Dave, the information from Snap-On was the same as yours, word for word except mine had an extra line that said "Minimum oil pressure at id...	3
	2007 Chevrolet Suburban 5.3L No Start, long cranking The fix for this vehicle was a new fuel pump assy, from AC Delco. This was the second pump installed in this vehicle, it had one put in at the dealer at 24000 miles. Waited 2 weeks to make sure it is fixed, talked to customer today, works great.	12
	2003 Oldsmobile Alero 3.4L Loses coolant Thanks to those that replies. The consensus was that the cooling system was building up too much pressure, or that the seal was poor at the cap. I bled the system again and made sure the cap was on properly and ordered a new plastic surge tank, but I haven't s...	8
	2001 Pontiac Aztek 3.4L a/c Again thank you for all the return information! After testing,with the information we recieved. It appears to be the Body Control Module, have yet to sell the repair, waiting on approval	3
	2002 Pontiac Grand Am 3.4L No Start With all the ignition tumbler and housing concerns,we replaced with no help.However both crank sensors have seemed to do the job.Thanks for the help.	3
	2006 Pontiac Grand Prix 3.8L Odometer I think the customer is not playing with a full deck here. I personally drove car 104 miles and it worked perfect, I think somehow it was on km/h when she checked the miles. Also found out that she just bought the car the week before and has a 5 yr old son t...	4
	2001 Saturn SL1 1.9L MIL Lamp on after stepping away from this one for a few day .. i started back at the basics.. and found the devertor valve would leak vacum and caused my whole problem Trouble codes: p0410 (air system).	6

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