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MTronic diagnostics / ecm failure symptoms

Discussion in 'Chainsaws' started by ABarrick, Apr 24, 2019.

  1. ABarrick

    ABarrick TacomaTRD98 on AS

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    I’m looking for a little help with determining what’s going on with my 462. The saw runs and cuts “ok”, but has become sluggish off idle. No longer has the lightning quick throttle response and acceleration it once did. I don’t have any repair manuals for anything m-tronic to see what stihl shows for a correct diagnostic path.

    I’ve done the recalibration several times since the weather has been anywhere from 40-80* in the same two day period here lately.

    Timing is (was) advanced about 6-7* and muffler modded. Roughly .700” diameter hole in stock location. I put the timing back to stock to see if it had any affect on the situation. No change.

    Changed plug, no change. Color indicated a good tune.

    Pulled carb, no dirt found in screen, everything looked fine. Fuel line is not restricted.

    Fuel is same batch that runs fine in other saws.

    I’ve exhausted all the simple stuff, so now I’m down to blaming the coil/ecm or the carb solenoid. Has anybody had a coil fail that still ran but was doggy?

    The saw has about 12 or so tanks on it. It ran good stock, ran really good after the muffin mod and timing adv (about 3 tanks that way) and now it’s just irritating me.

    Thanks guys.

    AJ
     
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  2. RI Chevy

    RI Chevy DollyKitaStihlvarna Runner

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    I am guessing, but it screams bad solenoid. Hopefully someone in the know pipes in.
    @Mastermind
    @Redbull661
     
  3. leadfarmer

    leadfarmer Hot Rod !!!

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    When Andy's 661s do that a new solenoid usually takes care of it.
     
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  4. Mastermind

    Mastermind Leader Of The Clique Staff Member

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    Change the solenoid, reset...
     
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  5. ABarrick

    ABarrick TacomaTRD98 on AS

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    I’ll grab a solenoid next time I’m at the dealer and try that I guess. I had always heard they acted rich when solenoids fail and it doesn’t seem rich.
     
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  6. huskyboy

    huskyboy Sorta a Husqvarna guy.

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    Just use your 572 :p.... but yeah seriously, I’m following the thread cause I’m interested.
     
  7. czar800

    czar800 Here For The Long Haul!

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    How’d Aj, How’s the new little fella doing?

    I just had a 201 doing the same thing and a solenoid fixed it. Good luck and keep us posted.
     
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  8. ABarrick

    ABarrick TacomaTRD98 on AS

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    I gave the 572 to a buddy of mine to try for awhile so it’s back to my Dan Henry 372...Seriously don’t know why I own any other saws, that thing rips.
     
  9. ABarrick

    ABarrick TacomaTRD98 on AS

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    Good to know about the 201. Little guy is growing like a weed. Been struggling with some stomach/digestive issues but overall he’s healthy and usually happy.
     
  10. tree monkey

    tree monkey Mastermind Approved!

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    just so you know, there is a 2 year epa warranty on the solenoid
     
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  11. ABarrick

    ABarrick TacomaTRD98 on AS

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    I’m sure he runs more fuel through them in a day than I do in a month but, how often does he have trouble with them?
     
  12. smokey7

    smokey7 Pinnacle OPE Member

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    Does this mean they will replace it free? Will they give you a new one to change yourself? Or is the part free but you must pay labor to replace.
     
  13. Mastermind

    Mastermind Leader Of The Clique Staff Member

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    Good questions.
     
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  14. tree monkey

    tree monkey Mastermind Approved!

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    parts and labor, at the shop only
     
  15. leadfarmer

    leadfarmer Hot Rod !!!

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    Not that much but some. Seems like the white ones r better. He changes them himself so I really dont know. Haven't heard anything lately tho.
     
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  16. PogoInTheWoods

    PogoInTheWoods Pinnacle OPE Member

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    Try a fresh batch of fuel. A 462 M-tronic isn't 'other saws'.
     
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  17. Duane(Pa)

    Duane(Pa) It's the chain...

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    AJ has about a thousand saws. Doubt it’s bad fuel...
     
  18. PogoInTheWoods

    PogoInTheWoods Pinnacle OPE Member

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    Whatever. I'd at least throw some fresh mix at it before chasing ECM ghosts and jumping through all those other hoops.

    Sure would be embarrassing to take it to the dealer for a new solenoid or ECM diagnosis (which basically doesn't exist anyway) just to find it didn't like the particular batch of fuel in the tank..., or worse...the mix oil!
     
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  19. pro94lt

    pro94lt Super OPE Member

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    Any updates?
     
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  20. ABarrick

    ABarrick TacomaTRD98 on AS

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    Fuel is fresh VP sef mixed with ultra (yes, the most horrible oil ever :eek:) at 40:1. “Other saws” include a 462 standard carb, a 261c, a 661 carbed, a 261 carbed, a 461 and a 440, so I ruled out fuel. This 462 ran fine on the same batch of fuel for several tanks before it took a fit.
     
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