Bought $450 5.4l 2000 f150 4x4. No power under acceleration

Discussion in 'Other Hobbies' started by deezdrama, Nov 9, 2019.

  1. deezdrama

    deezdrama forum member

    Just picked up a high mileage 5.4l 2000 F150 4x4 for $450.

    Was too cheap to turn down, even if I had to replace motor ...I got several other donor fords in my backyard.

    It starts rough then settles down and idles good. Driving under acceleration is horrible. If i just let it idle around its ok. If I give it any pedal it shakes and struggles to even move.
    I drove it home about 4 miles away and was scary lol.
    Barely even moved. I ended up finding a sweet spot of how much gas to give it and could keep it going about 10-15mph. Anymore and it would bog down. It would shake/shudder a bit when first accelerating from a stop...then it would straighten out.

    Felt like clogged cats to me but thats the simple solution Im hoping for....But about halfway home It gave a little "poof" sound like a backfire and immediately smelled rotten eggs and then it started driving almost completely normal.

    It needs a new intake as this one is cracked and leaking coolant.
    I guess I will start by pulling the cats and gutting them and order a new intake.

    He said he bought it in this condition which title shows he got it about a year ago, said he didnt have time to mess with it and moving. Said all he has done is put new plugs in it and fuel filter.

    So.... It was worth the risk to me for the price. Minimal rust and in pretty good shape. Newer tires,new battery, and had a new pioneer deck,mtx amp and subs that are worth the $400 and could sell for what I paid for the truck.
    Didnt see any major leaks, fluids looked/smelled good. No knocking..... I hope its a relatively easy fix and will last me a few years for winter vehicle while the mustang is put up.

    So...... Im going to start at the cats. Any other common issues or suggesstions or specific parts I should be looking at as the culprit?

    I have an e350 that acted similar and ended up having to put in new trigger wheel and replacing timing chain/tensioners while I was in there.
    Even if I have to do that to this I think it will be worth it if it lasts even just a couple years....but 260k miles so its a gamble.

    No CEL but will throw scanner on it tomorrow.
    Any suggesstions or opinions?
  2. Juice

    Juice forum member

    Owning a 5.4 myself, I've been told by my emission inspector buddy, that a bad COP will NOT throw a CEL on some of these. So its a sniffer test and not a obd scan for testing.

    Having said that, I would start with pulling the plugs and see what they look like. Might as well do a compression check while there. The plugs will tell you the story. That is where I would start.
  3. deezdrama

    deezdrama forum member

    My 07 vic had same issues as this f150.
    Intake was leaking,causing several plugs not to fire correctly cel light but the unburnt fuel ended up clogging the cats and had same no power under acceleration issue.

    This f150 does have leaking intake so im assuming the same thing is going on.
    Will be ordering intake this weekend and should have a set of coils and plugs from my 02 navigator in garage somewhere i will swap in when replacing intake.

    This is my best guess at the moment as there is no cel light.
    Didnt know if there was any other common issues that could be part of the problem

    UPDATE... ran my scanner and getting p0171 and p0174 codes which are lean conditions for both sides. I doubt both o2 sensors failed so am I right assuming i have a vac leak from this intake which is currently leaking coolant?

    UPDATE 2.... pretty sure I got screwed.....coolant resevoir smells like straight exhaust so pretty sure it has a blown headgasket .
    I wouldnt even care about doing headgaskets but have to decide if I want to go through the trouble and risk finding a cracked head
    Last edited: Nov 9, 2019
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