Expedition 4,6 2001 first second no power

[Dirk12]

Hello,

driving a Expedition 4,6 2001.
the Problem is, when I start the truck in the morning and i hit the
accelerator, there is no power for 1 or 2 seconds.
That means, the truck just rolling slowly, no acceleration.
After that issue, the truck runs fine. Like never got a problem.
If I start the truck, wait 20-30 seconds, the truck got not the problem.
Do you know maybe the problem?

Many thanks!

 

[Trainmaster]

Is it the motor or the transmission? If the trans, check the fluid level and/or change the fluid and filter.

 

[Dirk12]

Its the motor, its like get no gas.

 

[Trainmaster]

With motor problems, you have to determine if the problem is ignition or fuel related. You should check fuel pressure for starters. See where it starts and how it behaves.

 

[Habbibie]

Maybe your fuel pump is aging and isn't priming fast enough, think you can do a fuel pressure test when the motor is still cold and see what you get the first couple seconds?

 

[Dirk12]

I change the fuel pump 2 month ago. it was a Delphi pump. good idea I wanna do a fuel pressure test.
but i am wondering, that after 20 sec the truck runs great. what can it be, that the fuel pump got the problems with the first second?
when i drive and start the truck 3 hours later, got no problems. just in the morning, the the truck parks the hole night?

 

[Habbibie]

So when it's hot or warm it's fine, when it's cold it acts up.... hmmm that makes it more difficult to diagnose, I wouldn't suspect fuel pressure anymore if what you said is true, not too sure at the moment but from seeing what few have experienced on this forum it's usually exhaust related (EGR?)

 

[Dirk12]

hm, I think after 3h the engine is cold. how can i check the egr?

 

[1955moose]

4.6 motors do have Egr port problems. Pull the egr, clear out the port running from EGR valve through intake manifold. They get clogged with carbon. Problem is though, that a plugged passage will usually act up when hot not cold, and will make it fail a smog test. As far as testing , use a vacuum pump when warm, motor will want to die as you apply vacuum. Theirs also a test for the electronic egr sensor, that you'll have to look up. I'm with the others, run a fuel pressure test, it's possible that Delphi pump is not pumping when cold. Your symptoms definitely scream fuel. Also run a diagnostic codes test, see what codes pop up. Report back what you find. Usually most vehicles run good cold, not hot.

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[Dirk12]

sometimes, 1time in 2 weeks comes the issue P0442. I erase the code and comes in 2 weeks again.Thats it. My wife came just from work, in the morning she got the problem, but after 8 h after work, no problem. thats why i am wondering. so the engine was cold after work, but no issue.

 

[Dirk12]

could it be a problem with the batterie?

 

[Dirk12]

maybe the garage who change the fuel pump, rebuilt the gas tank and something went wrong by the repair?
negative pressure hose maybe damage (P0442 issue comes all 1-2 week) so the truck drive by starting in the morning the gas got mixed lean?

 

[Dirk12]

negative pressure hose maybe damage: thats maybe the problem. but after repair in the garage, this issue come 3 weeks later. May I check it or repairing without remove the gas tank?

 

[rjdelp7]

When first started cold, my idle is high. After 20 seconds it drops. If I try and drive while high, it can act strange. I just wait for it to idle down, plus a a few seconds. It is not good to 'hit it', on a cold engine. Try spraying you MAF sensor(use the correct cleaner). Check your PCV hose for leaking. The rubber rots and causes a vacuum leak.

 

[marc88]

Check ETC sensor working in its perimeters

 

[Dirk12]

what is a ETC Sensor?

 

[1955moose]

It stands for engine coolant temperature, and it's Ect. Basically its a sensor that works through the computer and senses if the motors cold, warm, or hot, and adjusts the fuel trim accordingly. When they fail, the computer gets confused, sending too lean a fuel mixture when cold, thinking the motors warmed up already. Same for when it's warm, it thinks it's cold still, and sends too much fuel. Your code that keeps popping up is an emmisions code involving something wrong in the Evap system. Simplest is check the fuel cap, then inspect all the hoses from the tank up to the cannisters, one of them has got a hole or tear along the way. I don't think your fuel pump is bad, more than likely a hose got messed up during removal/reassemble of tank. Probably tore one back by the tank. You or your mechanic, will need to drop tank again and hopefully find damage. It's always something with cars and life!

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[1955moose]

Their is a etc. But that's on I believe 04 and later expedition .It stands for electronic throttle control, which replaced the cable that actuated gas pedal to throttle body. On newer vehicles, some refer to it as fly by wire!

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