Fuel injectors or damper?

Discussion in 'General Automotive Tech' started by escortwgn, Mar 26, 2022.

  1. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Yes, the shape of the air induction can affect MAF operation. Why a lot of CAI setups ultimately are crapola, the operation of the MAF is dependent on the factory induction design. Change it, you change engine operation.
     
  2. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    And BTW, intake misfires are indicative of lean AFM. MAF problems can contribute to lean AFM, just as a vacuum leak can.
     
  3. escortwgn

    escortwgn Active Member

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    Yeah I’ve seen how fussy it can be. The misfire was at like 200rpm whilst the computer and all was trying to get the engine to speed. Once at idle it didn’t show its face. I had it bad a couple months back when trying to get the perfect filter and MAF location. Backfires through intake and a few out the exhaust. But where I have it is the only place it works. It was at 12oclock, but have it at 3 now. Drove around today with no issues. Even floored it…..hit 70 without any hesitation. But I’m not gonna give up on the MAF install. Though the option of MAP is there, and easy to convert to. All I’ll need is the computer lol
     
  4. escortwgn

    escortwgn Active Member

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    I just cranked it WITHOUT letting the cycle and she did hesitantly fire nicely. So it’s no longer fuel and is MAF placement
     
  5. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Very good! You don't lose all that much on a swap back to speed density. My '89 has everything factory (except the longblock, which is from an '87, but is exactly the same as the last 5.0s Ford ever used in Panthers), and for 150+ HP, she still gets up and goes, and does 75MPH in speed control on Interstate 10. Even will drop into Second at speed, accelerate to bury the speedo needle, and still keep accelerating.
     
  6. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    You could swap in a 5.0 short block with a factory roller cam (86 and newer, IIRC), and that'll make things better.
     
  7. escortwgn

    escortwgn Active Member

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    The speed density before was CFI. Terrible setup. That’s why I upgraded. Too many bugs started creeping up and lack of parts. But since it’s doing better, all I’ve got to do is find a happy position for the MAF.

    not sure if I mentioned a few posts ago, but a couple weeks ago I took it on the interstate for a test run, got it up to 94 with plenty of room on floor and on the engine. But was shaking a bit too much and too much traffic on i95 lol. The shaking is more than likely tires out of balance. But it’s def got more pep in er step with this upgrade.

    but yeah, if the MAF setup gives me more trouble, then I’ll take it to a MAP

    thanks for all your help! I’m calling this thread complete haha
     
  8. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    MAP is speed density. The only differences are the sizes of the fuel maps in the PCM's read-only memory, which deals with fuel adaptation, and the way the fuel's delivered to the cylinders. The fuel delivery to the engine and the pressures it operates under are the same, that's why port injection can be dropped onto the engine to replace the CFI. Yeah, I'm very familiar with CFI, as I had two '83 wagons to keep running years ago.
     

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