GM Automotive Technicians Technical Discussion and Fixes for Feb 24, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1993 Cadillac DeVille 4.9L abs light on VIN: 1G6CD53B0P Hello fellow techs,I am in a dilema with this car,came in with ABS light on,only thing I can get out from the snappy scanner is codes and cannot clear them,I have codes 37(left rear speed is 0 m.p.h)and code 45(LF inlet valve circuit) I checked all the speed s...	View
	1995 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6KD52B5S this car came in for hi nox--replaced inop egr valve and nox is normal--ran threw load test and hc and co are high--and they were not during the state emmission test printout--monitoring block learn and intergrator and it will stay @ 128 even in closed loop--o...	View
	1989 Chevrolet Beretta 2.8L No Start VIN: 1234368756 Customer comes in with complaint of oil leak. Entering shop I notice an engine miss fire. Replaced 1 burnt plug wire and plug in # 5 cyl. Miss fire still present. Tested injector wire with noid light = (ok). Unplugged injector (no change). Checked compression ...	View
	1990 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 1GCDC14K3L hello guys. Feeling stupid here . this chevy has spark , injector pulse but looks weak. has good compression 5.7 to 5.7 new engine replacement. will start sometimes and die other times will not start at all . spark looks weak at times and so does the injector ... Trouble codes: 44 (lean)	View
	1994 Chevrolet C1500 4.3L Surge, Cuts out VIN: NOTVALIDVI This one is deffinatley for the books, Customer complaint of cutting out when turning right and clears up after you straighten it out...Test drove it and sure enough , only when you turn right it cuts out, runs great otherwise , even idles smooth.. pulled vehi...	View
	1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R6T I will try not to write a book on this truck. This started months ago with fuel pump failures. The customer has put in 5 fuel pumps in the last 2 1/2 years. Shortly before I repaired the fuel pump problem the truck came in with the trouble codes for the EGR a... Trouble codes: P0122 (TPS signal low voltage), P1122 (tps circuit intermitent low voltage), P1406 (EGR pintle position)	View
	2000 Chevrolet Suburban 1500 LT 5.3L Power steering VIN: 3GNFK16T6Y We originally changed the pump because there was a leak. Soon the vehicle came back complaining of intermittant no assist. The mechanic opted to change the pump again, and the pump that was put in was listed as for a 2 wheel drive, and the pump had normal assi...	View
	2000 Chevrolet Suburban 1500 LT 5.3L tcc VIN: 3GNFK16T1Y This Suburban has a converter clutch that's shifting in & out at light throttle pressure @ 30 to 45 mph. I can watch TCC sol % remain fairly constant at about 50% and see the slip RPM go back & forth from 20 to close to 300 quickly and erratically. If doesn't ...	View
	2001 Chevrolet Corvette Z06 5.7L abs module VIN: 1G1YY12S21 Thanks for reading this. I have been through every component with this problem. First let me say that this car has huge AP racing brakes (14" rotors & 6 piston calipers) and races at Sebring. DTC C1225 (LF wheel speed signal erratic) is set at random times, e....	View
	2002 Chevrolet Impala 3.4L Starting VIN: 2G1WF52E42 Veh. came in for intermit. cranking cond. Turn key and no crank/ Jiggle key and will crank. Changed Ignition switch (elec part) Turn key no crank/ Turn key loose, wait for a few seconds, turn key & will crank sometimes on 2nd try. After cranking motor if I tur...	View
	1998 GMC K1500 Sierra SL 5.7L engine block VIN: 1GCEK19RWR We replaced the lower intake gaskets about 300 miles ago, due to external leakage that had been there for some time.ROLOC PADS WERE NOT USED AND OIL WAS CHANGED. She picked vehicle up on Saturday, called Tuesday to say that it was running better than ever. Cal...	View
	1998 GMC C-Series Topkick C6H042 7.2L Mechanical VIN: 1GDJ6H1C3W hope some of you diesel guys can give me some insight to this gmc 6500 top kick tow truck. I have a crank no start situation (battery voltage 12.4v), checked the fuel filter and it is full, oil is full, coolant is also full hooked up scanner and got a code for...	View
	1995 Oldsmobile Cutlass Ciera 2.2L Poor Idle Quality, Misfire VIN: 1G3AJ55495 This car has never been seen by us before. This car was sold at auction and brought to us by company that bought it. When car started has a misfire on cylinder #1 all the time. Started checking ingition system, plugs, wires, crank sensor, all seem good. Moved ...	View
	1995 Pontiac Bonneville SE 3.8L No 3-4 shift VIN: 1G2HX52KO8 Owner complained of the car not shifting into overdrive at times. If he would stop and restart the car it would shift normal again. I first found the p0740 TCC code and dirty trans fluid. After checking the TCC curcuits I replaced the solenoid and serviced the...	View
	1996 Pontiac Grand Am GT 2.4L No Start VIN: 1G2NW12T7T customer complains of intermittent no start. when problem occurs, engine cranks but no start. customer has had vehicle to a local dealer a couple times, the dealer claims to have retrieved a code(b1021)in history records, cannot find any code definitions relat...	View
	2001 Pontiac Aztek 3.4L Gauges & Other Items VIN: 3G7DA03E91 This Aztek does a multitude of wacky electrical things. After an hour or so of driving the dash gauges go beserk, the warning lights go on-brake,cel abs and others. The doorlocks cycled and the radio went to the CD mode. Once at night the headlights cut off wh...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Cadillac DeVille 4.9L air conditioning VIN: 1G6KD52B3S this was definately a learning experience from an owners point of view. i was home sick and was un able to supply all the info available. first of all when i was able to go in to work on sunday the first thing i did was check the vehicle on-board diagnostics. ...	14
	1992 Chevrolet Astro 4.3L Excessive Emissions, Hesitation, Surge VIN: Z5NB114107 Thank you all for your information. I finally fixed the astro, as many of you had said fuel pump, it wasnt the pump but in the same area. After rechecking pump amperage and waveform, and flow testing again. All checked okay. Dropped tank for kicks and giggels....	12
	1993 Chevrolet S10 Blazer Tahoe 4.3L abs VIN: 1GNDT13W6P Cost of abs control module has put this car on the back burner. Car is still here but customer has put it on hold. Will post Fix when he lets us repair as I'm sure he will.	9
	1995 Chevrolet Corsica 3.1L Stall, HARD START VIN: 1G1LD55M9S Hey thanks for all the help. Sorry for taking so long to post but the customer was not in a hurry & I was pretty busy. I finally found that my bogas readings at the scan tool were coming from the map sensor even though things looked good at the ecm. I only whi...	7
	2000 Chevrolet Cavalier 2.2L No Start VIN: 3GIJC5243Y Thanks to all for the good information and advice`. Once again, I learned all over to verify test results. I always heard the fuel pump run and assumed tht it was pumping. There was no test connector on the fuel rail for easy hook up so I finally manufactured ...	10
	1994 Geo Tracker 1.6L thermistor VIN: 2CNBE18U5R I want to thank everyone for helping with this problem. David, you were right,the new thermistor reads around 1200 ohms and, Michael, I looked in my Mitchell and there it was. I'm getting blind in my old age. Anyway, put the new one in and everything works gre...	3
	2000 GMC Sierra 1500 SL 5.3L hard start when hot VIN: 1GCEK14W91 recieved the truck back into the shop. most replys for the fix were a leaking fuel pressure regulator. Most sugested to pull the vac. line off and check for fuel in vac. line, BINGO ,my hats off to all who helped, i hope to be of assistance to you guys in the ...	17
	2000 GMC Sierra 1500 SL 5.3L ABS module VIN: 1GTEK19TXY The truck is fixed. Thanks for all the help. I disconnected the front sensors at the harness. Hooked up the motor for the on-the-car brake lathe to the hubs. Turned on the motor & watched the AC voltage for each hub & sensor assembly. Used the Snap-On vantage ...	9
	1997 Oldsmobile Achieva S 3.1L Accessories VIN: 1G3NL52M2V Thanks guys ,you did it again !!All the reply i got where pointing down the a/c cluch coil,that's making sense since it's been so cold this whinter so the a/c system was out ,but this weekend it was milder so the system engaged and there was my fuse 'blower' !...	5
	1992 Pontiac Grand Am SE 2.3L Valves VIN: 1G2NE5431N Thankyou to all that replied. Many said valves would be bent. I removed head and found all intake valve damged. Customer seems to have no problem with putting a chunk of money into the fix. Before replaceing the gears and chain I had asked two locall techs and...	22

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