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Thread: Knock and can figure it out

  1. #1
    Tuner in Training
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    Knock and can figure it out

    Can someone take a look at my tune and tell me what they think because i am new at this. My car is a 02 ss with a mti heads and cam package and thats pretty much all i know no actual specs. The problem is that its picking up a know and im not sure if its the timing or what.

  2. #2
    Advanced Tuner Dragman's Avatar
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    guy's would need a scan file and most would say with wideband AFR data also.

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  3. #3
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    i havent insatalled my wideband yet but here is a scan

  4. #4
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    Check your fuel pressure at the rail and clean your MAF real good. Make sure the small hose between the PCV valve and the intake manifold is not leaking. Your LTFTs are really high. It looks like it would like to be pulling more than 4 degrees of timing if it could but that is what it is limited to in the tune. You need to get the fuel trims down first. Before you change the tune to get them down, you have to be sure it is not a mechanical or sensor issue causing them to be high.

  5. #5
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    i know my fuel pressure is right around 60lbs and i will check for leaks as well

  6. #6
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    well i checked for leaks and even changed the MAF and no luck, anything else that could leak?

  7. #7
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    and also i looked at a few of my runs and my injectors are over 90% is that normal?

  8. #8
    Tuner in Training
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    ok i took my intake off and i did find that the line off of the rear of the drivers side valve cover was completly off, could that have been it?

  9. #9
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    That "line" as you put it will be a vac line or a PCV hose. Either would greatly skew your fueling tables. Any line not connected will cause issues. Obviously, reconnect and start scanning and tuning again.

  10. #10
    Advanced Tuner robbyredneck's Avatar
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    Quote Originally Posted by 2xLS1 View Post
    Check your fuel pressure at the rail and clean your MAF real good. Make sure the small hose between the PCV valve and the intake manifold is not leaking. Your LTFTs are really high. It looks like it would like to be pulling more than 4 degrees of timing if it could but that is what it is limited to in the tune. You need to get the fuel trims down first. Before you change the tune to get them down, you have to be sure it is not a mechanical or sensor issue causing them to be high.
    pretty good vision.
    04 6.0 silvy china turbo
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