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Thread: sputtering loss of power when dropped into low gear... M20

  1. #1
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    Default sputtering loss of power when dropped into low gear... M20

    Weird issue, although barely noticeable at the moment, being a sputtering loss of power when I hit the gas. Most noticeable when the revs get up past 3k.

    Head gasket?

    I do have a very, very minor front end leak, so I assumed the gasket may finally be giving up the ghost.
    EuroLux:. Private Detail
    E34 1/'89 ///M20 2.5i: Lachsilber

  2. #2
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    Quote Originally Posted by CharlesAFerg View Post
    Weird issue, although barely noticeable at the moment, being a sputtering loss of power when I hit the gas. Most noticeable when the revs get up past 3k.

    Head gasket?

    I do have a very, very minor front end leak, so I assumed the gasket may finally be giving up the ghost.
    Maybe pull your plugs and have a look at them?

    As a (very) general rule of thumb,
    misfire when pulling away = air mixture problem
    misfire in high rpm band = ignition/fuel pressure problem.

    I'd fuel pressure test it, make sure the regulators not shot - and have a look at the condition of your leads/dizzy cap/rotor arm. The little carbon brush in the dizzy cap may be totally shot at?

  3. #3
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    Quote Originally Posted by ferret View Post
    maybe Pull Your Plugs And Have A Look At Them?

    As A (very) General Rule Of Thumb,
    Misfire When Pulling Away = Air Mixture Problem
    Misfire In High Rpm Band = Ignition/fuel Pressure Problem.

    I'd Fuel Pressure Test It, Make Sure The Regulators Not Shot - And Have A Look At The Condition Of Your Leads/dizzy Cap/rotor Arm. The Little Carbon Brush In The Dizzy Cap May Be Totally Shot At?
    +1

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    funny because I have another sputter when pulling away, lol...

    So I'll check what you recommended for the higher RPM power loss, and speaking of that...
    Good god, I'm gonna have to check o2 sensors for the "pulling away" issue, and what else should I look at do you think...?
    EuroLux:. Private Detail
    E34 1/'89 ///M20 2.5i: Lachsilber

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    Quote Originally Posted by CharlesAFerg View Post
    funny because I have another sputter when pulling away, lol...

    So I'll check what you recommended for the higher RPM power loss, and speaking of that...
    Good god, I'm gonna have to check o2 sensors for the "pulling away" issue, and what else should I look at do you think...?
    Hmm, is it losing any coolant/oil at all, smoking out of the exhaust?

    If you've got a sputter pulling away I'd be having a look for tiny fractures in air hoses and the like.

    Ignition faults are also well known for causing issues at tickover as well - does it idle smoothly?

  6. #6
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    Quote Originally Posted by Ferret View Post
    Hmm, is it losing any coolant/oil at all, smoking out of the exhaust?

    If you've got a sputter pulling away I'd be having a look for tiny fractures in air hoses and the like.

    Ignition faults are also well known for causing issues at tickover as well - does it idle smoothly?
    Well, it loses coolant, but doesn't seem to drop anywhere. I'm fairly sure it's my heater core that does that, in the carpet by my feet.

    It does go through oil, right up front is where it leaks. Real slow though, maybe 1qt every 1-2k miles. No smoke, actually quite clean.

    Idles great, so I'll have to check for fractures in the hoses, as I think I just noticed a bit of a whistle today. Hmm...
    EuroLux:. Private Detail
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    My vote is on the coil personally. High load low rpm miss = coil

  8. #8
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    First perform a tune up. Replace those plugs and remove the cap and rotor and inspect to see if they need to be replaced. Verify condition of wires. When I first bought my e34, same misfiring used to occur. I guess the original owners did want to deal with trying to find the problem.

    I just replaced the plugs and all was good. I purchased new cap and rotor anyways.
    Greg Mannino
    Car Audio.Video.Security.Navigation Guru
    Electrical/Mechanical Specialist

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