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  1. #1

    Default 1988 88 hp johnson still won't idle

    I have a 1988 j88. It has great spark, good compression, new fuel, lines, abd carbs have been rebuilt. Starts easy, but will not idle below 1800. Motor will shudder and die. HELP

  2. #2
    Join Date
    Feb 2001
    Location
    Central West Florida
    Posts
    11,937

    Default Re: 88 hp johnson still won't idle

    Good compression..... should be approx 100+ psi and even on all cylinders.

    Great spark..... with spark plugs removed, spark should jump a 7/16" gap with a strong blue lightning like flame.... a real SNAP!

    Is this what you have? If so, I'd suspect something is still amiss in the carburetor department.

  3. #3

    Default Re: 88 hp johnson still won't idle

    Compression is 125+ on all 4 cylinders. spark jumps 20mm gap with a real snap. fuel pump works fine. can't figure this one out.

  4. #4
    Join Date
    Feb 2001
    Location
    Central West Florida
    Posts
    11,937

    Default Re: 88 hp johnson still won't idle

    I've no idea what 20mm is in comparison to 7/16" but I'll assume they're close to being the same distance?

    The throttle butterflies should just start to open and close when the scribe mark on the cam is aligned dead center with the throttle cam roller. If this function is as it should be, that would lead me back to the carburetors.

  5. #5

    Default Re: 88 hp johnson still won't idle

    20mm is about 3/4 of an inch. carb settings look like what you describe. I have bee around motors all my life. This has me stumped. thanks for the help.

  6. #6

    Default Re: 88 hp johnson still won't idle

    I had the same problem with mine, not saying this will fix yours but i had to replace the power pac, when it was installed it ran better than it had it months, just a idea hope it helps in some way....mine was a 1993 88hp evinrude

  7. #7
    Join Date
    Jul 2007
    Location
    florissant, missouri, us
    Posts
    224

    Default Re: 88 hp johnson still won't idle

    if you are running a vacum gauge make sure there is no leaks

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