’02 F150 4.2l intermittent loss of power.

Hello Everyone,

this is one hiccup that has me stumped…

’02 F150 – 4.2L – XL (basiclly standard at least in my mind)

Out of the blue… when I accelerate getting on the HWY sometimes it is okay other times complete loss of power and I mean it could happen at 35mph or at 75mph.

Does not seem to matter what kind of load it is under nor if I am gentle like around town or flying up a hill it Cuts Out complete loss of power then it will come back with a bit of peppering the gas.

Now what I have done attempting to rectify it.

1. New fuel filter.
2. New coil pack.
3. New plugs and wires .054 gap.
4. New Fuel Pump Relay

It was showing 30lbs on the fuel rail at idle with my pressure guage

Things I have done recently are the EGR Valve, all the top of the motor stuff like that (PCV) , but that was a couple months ago…I was beginning to think it was the trans because as I sat dead on the side of the road… when I would put it in Neutral the engine roared like a lion as if the problem was not in the fuel delivery.
So…

5. New Trans filter and fluid.
Even emptied the torque converter (who knew there was a drain plug? go figure)

Trans is the 4R70W.

This is a new issue I must say.

Complete, Intermittent Loss of power but the engine never dies and runs great when out of gear.

I had to amend the runs great out of gear statement when it is fussy it can run poor any time but it always clears up hot or cold.

You know as I write this and thinking about it the engine did stall this AM it was 23 degrees here in NJ.

But it started right back up again.

She is not throwing any codes at all.

The fuel tank had too much gas in it to drop it to look at the fuel pump.

So I borrowed 3, 5 gallon gas cans and tried to siphon to no avail.

I dropped the tank put in the new fuel pump.

After putting on about 8 miles limping around the neighborhood it felt okay to hit the highway wow what a pleasure it was just like have the truck new in early ’03 I was thrilled that was Sunday 12/22/13 Ya yesterday.

I confidently went out to do some grocery shopping and it was back with a vengeance.

Much more testy much longer before it would jump back to life So I thought “I bet my buddy had these plastic gas cans in his garage for some time and I might have dumped water back in to my tank with the old gas so I put in a pint of seafoam to 16 gallons did nothing that I could tell so I added a bottle of specific water stuff it was called Heet.

There you have it, I have looked through this great site and will look at testing vacuum tomorrow after I test the fuel filter for any obstruction post fuel pump might just replace it right after coffee.

Thanks in advance for taking a look and while I am feeling thankful

Happy Holidays to to all!