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bent pushrod/misfire?

This is a discussion on bent pushrod/misfire? within the Internal Engine forums, part of the LSx Technical Help Section category; Howdy folks. Just curious if a bent pushrod would cause a misfire. My car is missing pretty hard going through ...

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    Factory Freak Mikat1's Avatar
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    bent pushrod/misfire?

    Howdy folks. Just curious if a bent pushrod would cause a misfire. My car is missing pretty hard going through the gears in full throttle. I have recently replaced the plugs/plug wires 02 sensors and did an injector balance and everything came out OK. Please offer any feedback / advice that you have. Thanks

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    Factory Freak Mikat1's Avatar
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    don't everyone chime in at once

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    Member 2000dreambird's Avatar
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    could be anything really, i had a grand Prix that was misfiring because the boot on the spark plug wire had traveled up the wire a little ways, this caused the plug to arc out on the block instead of firring in the cylinder

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    Member jsmith564`'s Avatar
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    i have to get inside my motor, i have a vibration issue that might pass for a missfire.

    we'll see pretty soon. i have this weekend off.

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    Moderator 35th-ANV-SS's Avatar
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    You would hear a bent push rod. It would sound like a constant ticking. Why do you think you have a bent push rod? Did you over-rev the motor?

    Misfire is usually: bad wire, bad plug, wire not fully seated on the plug, or a vacuum leak. In your case, since you changed the wires and plugs already, I would guess a vacuum leak.

    Have you checked your fuel pressure? If should read 58psi. If it isn't, you aren't getting enough fuel which could be a fuel pump issue, fuel filter, or a bad injector.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    A weak coil or coil ground can cause intermittent misfire also..
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    Factory Freak Mikat1's Avatar
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    Quote Originally Posted by jsmith564` View Post
    i have to get inside my motor, i have a vibration issue that might pass for a missfire.

    we'll see pretty soon. i have this weekend off.
    Good luck with that. hope its not too bad for you.
    Quote Originally Posted by 35th-ANV-SS View Post
    You would hear a bent push rod. It would sound like a constant ticking. Why do you think you have a bent push rod? Did you over-rev the motor?

    Misfire is usually: bad wire, bad plug, wire not fully seated on the plug, or a vacuum leak. In your case, since you changed the wires and plugs already, I would guess a vacuum leak.
    Have you checked your fuel pressure? If should read 58psi. If it isn't, you aren't getting enough fuel which could be a fuel pump issue, fuel filter, or a bad injector.
    fuel pressure is good, just replaced the filter, did an injector balance and they all perform well
    Quote Originally Posted by Smittro View Post
    A weak coil or coil ground can cause intermittent misfire also..
    haven't over revd the motor, assumed it was a bent pushrod because I fixed everything else it could have been lol. not sure on the vacuum leak. Don't know how to find one if I did

    looking into it
    Last edited by Mikat1; 04-16-2011 at 04:36 PM.

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    Could be a broken rocker arm. Especially if its broken on the intake side, itll just feel like a miss and vibration when you rev it.

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    Something Diabolical... chuckie669's Avatar
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    Just because it was recently replaced doesn't make it free and clear from being the culprit.

    Id start with the most recently changed things. Check and make sure one of your wires didn't wiggle loose. Had a buddy with a bad mis. Wore a thick glove to protect from heat and put pressure on the wire boot at the coil and then the plug. One was pulsing differently from the rest. Pulled, checked and replaced it to fix the issue.

    Guessing your not throwing any codes yet.

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    Veteran 0rion's Avatar
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    if you haven't bounced off the limiter I doubt it's a pushrod.

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    Member Jay37's Avatar
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    I'll tell you how I check for vacuum leaks, I understand stand "it's not safe" so do it at your own risk, I only say that so this thread doesn't get filled up with people concerned about my safety. Although I have never had a problem.


    Just put gas in a spray bottle, and spray all your air hoses with the car running, and if your rpms change that is a vacuum leak.
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    Moderator 35th-ANV-SS's Avatar
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    I've used brake cleaner.

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    Junior Member Keith01's Avatar
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    WD40 works also.

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    Member ldurham's Avatar
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    I wouldn't use Brake clean or WD-40.Get a bottle of carb/throtttle body cleaner and spray it all around your hoses and intake manifold. If you have a vacuum leak it will suck in the cleaner where ever the leak is and you will hear a change in your RPM's.

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    Member km346's Avatar
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    Quote Originally Posted by ldurham View Post
    I wouldn't use Brake clean or WD-40.Get a bottle of carb/throtttle body cleaner and spray it all around your hoses and intake manifold. If you have a vacuum leak it will suck in the cleaner where ever the leak is and you will hear a change in your RPM's.
    THIS... carb cleaner isn't corrosive to paint/rubber like brake cleaner, or as dangerous as spraying gasoline.

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    Member Jay37's Avatar
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    can this thread die yet?

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