Sport trac need a new motor?

[Dan95-5.0]

My 04 sport trac has 93k miles. I drove it to work fine like normal. No engine noises or rough idle. Leaving work i start my Trac and it instantly started rough. Sounds like a dead cylinder and i can feel it on the exhaust. It would vibrate bad coming to a stop or leaving a stop. No engine light came on and never has. I even scanned for codes using my xcal3 and nothing. I spray cleaned the maf. I had the plugs and wires changed and same results. I was told it had low compression on one cylinder and a new motor was needed.

Is this possible? Should i be looking for something else that can cause this issue? The no check engine light has me so confussed.

Any help?

 

[Tech By Trade]

Sure is, POS 4.0l V6 has a design flaw. Look up "death rattle" for more info.

 

[429CJ-3X2]

Make sure all your vacuum hoses are properly connected. My '94 Explorer would regularly blow a vacuum line off at start-up, and it would run rough like you describe.

 

[ptf18]

I realize the OP posted a month or so ago but I had somewhat of the same happen this past week. The wife started the S/T and backed it out onto the street. She parked it there for 10-15 minutes and when she went to start it the engine would barely run. White smoke came out of the exhaust and there was a definet miss.

We left the S/T parked on the street for a couple of hours and when I went to start it....lo and behold it fired right up. No miss, no stumble, no white smoke. Took it for a spin and it ran just fine. Neighbor came over with his scan meter. Even though I didnt have a "check engine light" on he found that there was a "miss" history on the #2 cylinder. With 202k miles on the plug wires Im going to change them out. The engine had been replaced (with new plugs) 70k miles ago...... timing chain cassette failure...... imagine that.

 

[koda2000]

Sure is, POS 4.0l V6 has a design flaw. Look up "death rattle" for more info.

Probably this ^ engine probably jumped time. POS SOHC engine design