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  1. #1
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    2007 300xs Coil Questions

    I was recently talking to Wildman about some widely varying performance numbers with certain props I've been trying out. He said some of my numbers don't make sense and after some conversation he suggested maybe I have a coil problem.

    I test COP coils the old way- with a timing light. It's possible I have one or more working intermittently. I'm first asking if this is even possible. Seems to me they work or they don't.

    I'm looking for informed opinions and suggestions. On coil testing, or anything you might want to contribute.

    Thank you in advance for the response
    .

    I've bought and sold 22 boats in 26 years. I fix them up and then get bored and look for another. It's a hobby.

    Now running a Liberator 21 with a 300xs


    .

  2. #2
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    About the only advice I can offer:

    1. They can definitely be intermittent, or only act up under load.
    2. Have fun and good luck!

    Serving Performance Boaters WORLDWIDE! Injectors, tunes, superchargers!
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  3. #3
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    Pull them off and looks close for cracking or swelling. Buy one coil and install it. If it runs the same then move to next cylinder. In the 10 years I owned my 2007 300xs only had 2 coils fail.
    http://www.stvowners.com

    Checkmate 2002 Convincor 270 496 MAG-HO

    2003 Cougar 22MTR w/300xs SOLD
    90 21Skater w/300xs - sold
    98 STV Euroski w/280 - sold


    2006 Trailblazer SS 6.0l 395hp

  4. #4
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    If I have an intermittent coil failure would the plug likely look different?
    .

    I've bought and sold 22 boats in 26 years. I fix them up and then get bored and look for another. It's a hobby.

    Now running a Liberator 21 with a 300xs


    .

  5. #5
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    Quote Originally Posted by TraceF3 View Post
    If I have an intermittent coil failure would the plug likely look different?
    Only if you pulled after that one was down for an extended time. Once they fire back off, it cleans everything up again. I ended up replacing all of mine to solve the problem (lack of patience).

    Joe

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