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Thread: Need this running asap take 2

  1. #1
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    Need this running asap take 2

    I got the car all put back together. Now I'm getting about 16hg / 17hg vac but the car still hits something like a fuel cut around 4300rpm.


    Compression is about 155ish on all cylinders, plugs gapped at 35, no vac leaks, tested ecu...what gives, I have run out of options.

  2. #2
    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
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    Test the voltage from the TPS across its full swing to make sure its smooth.

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    Quote Originally Posted by CoreyB View Post
    Test the voltage from the TPS across its full swing to make sure its smooth.
    The tps and all other sensors are reading right. It just does not make sense. I've got good compression, good fuel pressure and good ignition...WTF.

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    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
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    Are you reading knock ? Sounds like the ECU senses something is wrong and is pulling fuel or timing.

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    Yea, when it hit the fuel cut, it read 2 counts but was just a hiccup.

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    I just drove the car around and it has the same exact symptom as before, rear turbo glowing, no power. I'll go out and check the plugs when it cools down.

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    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
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    Do you have a cat on it ? Sounds plugged.

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    No cats at all.

    Could stuck exhaust valves cause this but still show good compression?

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    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
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    No. A exhaust cam out of time might though.

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    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
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    My guess is that for whatever reason as you get closer to high RPMs the ECU is either not changing timing or changing it in a bad way. So that your spark is happening closer to when the exhaust cam is slightly open than when you are at TDC.

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