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#1
12-01-2008, 08:43 AM
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1996 K2500 5.7 random misfire
I've got a 1996 K2500 with the 5.7 and it has developed a random misfire. What I cant understand is I am not getting a trouble code, no check engine light. I recently replaced the crank position sensor, and that made no difference, and to my knowledge, that procedure is supposed to trigger the check engine light with a false misfire code, and it didnt.
There are days where it runs fine, and others it chugs so bad, starts hard, and at times you would think there are plug wires in the wrong spot. Other parts changed: Cam position sensor, fuel filter, plugs and wires, cap and rotor. I cant figure this out. ANY help is greatly appreciated. I am actually thinking of trading it off....
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1996 K2500 Reg Cab Long Box 5.7 Vortec, HD 5-speed manual (NV4500) LT265/75R16E Toyo Open Country M/T Hypertech Power Programming (AWESOME) K&N Air Filter, Flowmaster Exhaust Centerforce Dual Friction Clutch Pioneer Head Unit, MTX 200 Watt Amp, MTX 10" Thunder 4500 sub "To be old and wise you must first be young and stupid"   
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#3
12-01-2008, 03:17 PM
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Re: 1996 K2500 5.7 random misfire
When accelerating, its fine, but at steady throttle driving, it will "chug". I cant feel or hear it just reving the motor in neutral.
What is so baffling is that its random, it doesnt have this problem all the time.
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1996 K2500 Reg Cab Long Box 5.7 Vortec, HD 5-speed manual (NV4500) LT265/75R16E Toyo Open Country M/T Hypertech Power Programming (AWESOME) K&N Air Filter, Flowmaster Exhaust Centerforce Dual Friction Clutch Pioneer Head Unit, MTX 200 Watt Amp, MTX 10" Thunder 4500 sub "To be old and wise you must first be young and stupid"
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#4
12-03-2008, 12:00 PM
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Re: 1996 K2500 5.7 random misfire
Monday night filled up with fuel, and added a bottle of JB fuel injector cleaner, and it hasnt missed a beat since...
Time will tell, may have just been moisture, but I am also hearing about aftermarket fuel pumps acting up... Mine has a Carter in it now, I hope thats not the problem. If it does it again, I will test the fuel pressure, I have a buddy that can do that. Will go from there... Thanks for the help
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1996 K2500 Reg Cab Long Box 5.7 Vortec, HD 5-speed manual (NV4500) LT265/75R16E Toyo Open Country M/T Hypertech Power Programming (AWESOME) K&N Air Filter, Flowmaster Exhaust Centerforce Dual Friction Clutch Pioneer Head Unit, MTX 200 Watt Amp, MTX 10" Thunder 4500 sub "To be old and wise you must first be young and stupid"
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