swapped 4.3 to 6.0 and not getting spark to one cylinder NEED HELP

[farmtruc]

do you notice that the tach needle is slightly jumping up and down, or is it smooth?

we just had a 408 in here, built by other, reluctor wheel was damaged, was causing two cylinders not to fire, that was a pita!!!!

[butler145]

Yeah that's what I'm thinking is wrong with it. Cause have changed out everything else. So changing that was hard? Sucks cause just got motor in too? Will I have to remove motor to change? And how do I get it off crankshaft and install new one?

[farmtruc]

see if the rpm's are fluctuating, moving erratically, etc, the rpm is based soley on the crank trigger.

[butler145]

yeah they are slightly fluctuating. do u think that is what the problem is? about how long would it take to fix that? or how hard?

[farmtruc]

yeah they are slightly fluctuating. do u think that is what the problem is? about how long would it take to fix that? or how hard?

before you go digging in the engine, let's get what fluctuating means to you, quick jerks up and down, erratic, but staying in the same general area, not moving more than 20rpms up and down, like the needle is just flickering like a loose light bulb, that's what i mean. not a surge up and down, like the engine needs more air at idle.
make sure it's jerking, pulsing, kind of inconsistantly up and down.
IF SO, i say it's the crank shaft sensor or the reluctor wheel.
probably the wheel cuase the sensor is picking up the good teeth on the wheel and firing those coils.

that's just my guess, it's not hard to pull the pan.

[butler145]

well pulled the pan and looked at the relucter wheel didnt appear to have anything wrong with it. so dont know what else there is now to look for?

[danger_ranger83]

Check the free play in the crank