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Thread: SN95 rough idle/throttle kills the engine

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  1. #1

    SN95 rough idle/throttle kills the engine

    This prevented me from running race 4 at TWS.

    Now taking a look at it to see if I can get the car running for Hallett.

    Car has a ragged idle then when I hit the throttle it dies.

    Car ran about the same with TPS hooked up and not, so I replaced the TPS with no better results.

    Thoughts on where I go next? Motor is a 4.6 2v if that makes a difference.

    Thanks for any tips.

  2. #2
    Senior Member Grass-Passer cobra132's Avatar
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    The idle is controlled by the idle air intake valve. You will need to check it. Make sure there are no vacuum leaks. Then clean the mass air meter, check all connections and test all of the other sensors. The Haynes manual has a good protocol for this. If that does not work remove the 4.6 and install a 347 with a Holley 650.

  3. #3
    Senior Member Carroll Shelby Rsmith350's Avatar
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    Had a similar issue and it ended up being a MAP sensor
    " Racing makes crack addiction look like a mild craving for something salty"

  4. #4
    Senior Member Grass-Passer edrock96GT's Avatar
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    Check your TPS wiring to make sure there isn't a break anywhere in the circuit. Just from seeing how tight it was at TWS, it's possible it may have been yanked out somewhere. Based just off of what you described (same results with TPS hooked up and disconnected), it sounds like the PCM has no idea where the throttle is and when you open the throttle it just leans out and dies.

    Robert. Our 2V Ferds don't have them MAP thingys.
    Eddie Rock

    #21 AI '96 GT

  5. #5
    Tomorrow I'll clean the MAF and check the harness at the TPS. I'll bet it's one or both of those.

  6. #6
    Most likely was a dirty MAF. Now running like a top.

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