Problems with my new '06 4.0L SOHC...hesitation/missing

[Fx4wannabe01]

Hey.

Truck in question is a 2001 XLT 4x4 4.0 SOHC 5spd manual. Truck currently has a '06 4.0L SOHC using all the '06 engines sensors except the MAF, and using the '01 engine/trans harness(except where I needed to carry over the '06 pigtails on the sensors/pigtails that were different than my '01 engine). New engine had 1,000 miles on it prior to installation into my '01.


Revving off of idle, there is a hiccup. Feels like a miss. I feel the same hiccup/miss/hesitation when driving down the road when the engine is put under load(going up a hill, accelerating faster than needed). This happens in every gear. I am not throwing any codes, no CEL's.

New engine has all the sensors, plugs, injectors, fuel rails that the 1,000 mile '06 engine came with. Plugs looked brand new when I pulled them prior to install. I did put on a brand new coil-pack as the one that came with the engine was busted from yanking out of the donor truck.


A good friend of mine suggests checking the TPS sensor out. I have not checked anything since the truck hit the road after the swap. I'm thinking something electrical/spark.

Any suggestions?



Thanks!

Shane

 

[RotorFX4]

damaged plug wire?

I had a similar problem with my '02 4.0 SOHC. Miss under load, etc. mine was a plug wire that I had damaged while inspecting the spark plugs. I couldn't see it because it was damaged under the plug boot. try a new set of wires.

 

[Fx4wannabe01]

hmm...thanks!! I'll go try it out using my old plug wires.