2001 4.0

This is actually my sons but I fix it for him about 8 months ago some how he ran it out of water and destroyed the 1st 4.0 I found a good used one out of a wrecked 2000 with very low mileage during installation we broke coil pack so I got a new borg warner( I think is a good one ) and then had to put new crank sensor on it 1st was cheap now have B W the thing ran great till the cheap sensor went out now we have a miss on number 1 its getting fuel I replaced Injector swapped plugs #1 was wet but seems like no fire on #1 what send spark to each cylinder ? its so bag has no power to run hardly have not tried to drive on the road :pray: Thanks for any help its driving me crazy . Alan

Since you have a new to you motor that was used, consider a few things. A bad injector can cause those symptoms too. Try some sea foam in the gas and run it for awhile. Also I have cured a miss on a 98 4.0 by running premium, again an injector issue

I change the injector but thanks also I run Lucas in all my vehicles to prevent stuff like that and it works great I even run it in my 4 wheeler and lawn mower because the gas we get these days sucks

OK, just a thought

Have you actually checked for spark at the #1 cyl ? If not, I would. Just to be sure you aren't chasing a gremlin.

no way to check has coil rail goes over all plugs at once

Pull all the plugs and attach to the rail and turn the engine over and see if all plugs spark

how am I going to ground it ???

You really only have to check one. But just make sure the metal of the plug touches metal on the engine and it will fire

Can't hurt never thought about trying that way

You can narrow it down to spark or fuel injector that way

You should also be able to put either a old spark plug cable hooked up to the coil pack, for the #1, and any old plug into the cable. Or if you have a inductive timing light, that should tell you if it's firing, or not. But thanks to everyone else for jumping in, while I was offline.

Thanks for all the good info Ill try it but I still would like to know what sends signal to each plug ??????????

It is the PCM

I know that but what triggers each separate cylinder ? is it the cps? I think I may have a short in my wiring harness but not sure where to start looking

Yes, on that one the CPS triggers each individual coil to fire