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Thread: No power unless timing is way advanced

  1. #1

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    Join Date
    11-06-2016
    Posts
    7
    Location

    Mount Airy, NC
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    6G72

    No power unless timing is way advanced

    91 Mighty Max 4x4
    6g72 engine

    Replaced Cylinder heads (used ones)
    New timing belt

    When timed properly (at 0*) it feels extremely sluggish. With the timing advanced 30 degrees, it idles at 1,000 rpm, and has normal power.

    Ive verified that the timing belt has not slipped, everything lines up to TDC (did a piston stop test to verify), distributor lines up to cyl #1.

    Ive checked the belt and positions 3 times to make absolute sure.

    I'm pulling my hair out. Do you guys have any opinions?

    Thanks.

  2. #2



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    03-16-2011
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    3,803
    Location

    Sacramento, CA
    Vehicle

    1979 Dodge D-50
    Engine

    Chevy V6
    How did you align the cam?
    Many people go off the flat of the head. That is NOT correct.
    If it needs to have LOTS of advance your off 1 tooth and it will rev slow with no power.
    See this one for distributor grounding
    http://www.mightyram50.net/vbulletin...th-ECM-control

    See the picture in here.
    http://www.mightyram50.net/vbulletin/showthread.php/2258-G63B-2-0L-Cam-Timing-Mark


    Last edited by camoit; 12-17-2017 at 12:19 PM.
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  3. #3

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    06-15-2014
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    6,059
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    Quote Originally Posted by camoit View Post
    How did you align the cam?
    Many people go off the flat of the head. That is NOT correct.
    If it needs to have LOTS of advance your off 1 tooth and it will rev slow with no power.
    See this one for distributor grounding
    http://www.mightyram50.net/vbulletin/showthread.php/5368-How-to-set-the-timing-on-your-2nd-gen-Mighty-Max-with-ECM-control



    See the picture in here.
    http://www.mightyram50.net/vbulletin...am-Timing-Mark
    Phuzy is running a 3.0 V6. That being said - have you ground the ECM to trip it into diagnostic/tune mode? It won't accept a new tune until the ECM has been set. If this is the issue and it solves the tune problem, would you be prepared to try an experiment for me? Use this method to tune your truck and report back with your findings - http://www.mightyram50.net/vbulletin...ll=1#post56600

    I have used this on OBD I ECM's and it made a noticeable difference on 4 cylinders, but I can't see any reason why the same (if not greater) gains will be made on the V6 lump.

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