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no low end torque ,need help

Discussion in 'Stock 1995 - 2001 Explorers' started by hotstang111, June 20, 2011.

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    1. hotstang111

      hotstang111 New Member

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      '98 xlt 4 dr manual
      i have a 98 ex and i just put a brand new 4.0 ohv in it (dont ask how i got it) and im lacking alot of torque for taking off, i have to ride the clutch or it will bog out and then it has a hiccup around 1k rpm, i thought it was the fuel timing so i repositioned the syncronizer withe the correct tool from ford, it got slightly better but still very little torque. its a 1999 engine so would the computer(98') have the wrong fuel mapping from that year? any suggestion on what to look at
       
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    3. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      fuel pressure?

      Your 1998 stock was a return fuel system. In 1999 Ford switched to a higher pressure returnless fuel system. Did you use the fuel rails from the 1998? Also, I seem to recall there were engine wiring changes in 1999. Did you use the 1998 engine wiring harness with the 1998 PCM?
       
    4. hotstang111

      hotstang111 New Member

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      yea i switched everything from the 98 so all i changed was the shortblock and the heads, intake and plenum, switched the fuel rail and injectors, it doesnt set any codes, the last code i got was the p0340 about a month ago
       
    5. hotstang111

      hotstang111 New Member

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      how much would the backpressure effect it, i have a 2 1/2" flowmaster 40 with a turndown after the cats.
       

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