Thread: Time for another swap?

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  1. #1 Time for another swap? 
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    So I'm cruising around 75mph and notice the check engine light is flashing, I feel a slight vibration when accelerating. I pulled over and ran the OBD, I got the misfire 300 code. Very rough idle but decided to go on then boom, a super loud knocking sound that increases with acceleration.

    I swapped out my engine once before about 3 years ago with some help from you fine gents. Is my engine gone? Could something else cause a misfire and that dreadful sound? This website has changed a bit since then, I hope all the informative threads carried over here.
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  3. #2 Re: Time for another swap? 
    GTX Level Member QUICKSILVER462's Avatar
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    Check to see if the flexplate is cracked first.
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  4. #3 Re: Time for another swap? 
    Killa Bee Scottydoggs's Avatar
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    post a vid if you can. idle, then hold it at 3000 rpm and then just drop the throttle drop.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #4 Re: Time for another swap? 
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    Wouldn't I need to remove the engine to check the plate?

    Here's a vid, rev to 3000 then let go
    3.8 knocking - YouTube
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  6. #5 Re: Time for another swap? 
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    Also gives off the smell of gasoline.
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  7. #6 Re: Time for another swap? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Jesus that is one huge exhaust leak.

    Sounds like the rear manifold broke somewhere or at the downpipe connection.

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  8. #7 Re: Time for another swap? 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    Jesus that is one huge exhaust leak.

    Sounds like the rear manifold broke somewhere or at the downpipe connection.
    Sounds like good news, hope you're right
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  9. #8 Re: Time for another swap? 
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    Going under later, any places to check besides the obvious?
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  10. #9 Re: Time for another swap? 
    Turbo is the way to go. BillBoost37's Avatar
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    If that's an exhaust leak it should be very obvious and have a lot of carbon around the leak.

    I'm not so sure it's a leak, but start there since that's as good as anywhere else.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  11. #10 Re: Time for another swap? 
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    Thought it sounded like an engine knock plus the misfire code, didn't get a chance to check yesterday will do today
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  12. #11 Re: Time for another swap? 
    Killa Bee Scottydoggs's Avatar
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    or it could be a busted rocker arm or bent or broken push rod and that sound is the valve not opening. hoping for the exhaust leak.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #12 Re: Time for another swap? 
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    Quote Originally Posted by Scottydoggs View Post
    or it could be a busted rocker arm or bent or broken push rod and that sound is the valve not opening. hoping for the exhaust leak.
    I looked under, around the catalytic and could feel a strong airflow in my face coming from manifold/down pipe area but couldn't locate a crack or where it was coming from, it even tore up that fabric material (heat shield insulation?) around the down pipe area. It's raining hard so couldn't get a great look but it's def coming from behind the lower engine area, crossing my fingers for anything but a busted engine.
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  14. #13 Re: Time for another swap? 
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    One of the spark plugs had popped off somehow, screwed it back in and back to normal, thanks guys.
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  15. #14 Re: Time for another swap? 
    GrandPrix Junkie SgtMarshal's Avatar
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    Quote Originally Posted by steelholder View Post
    One of the spark plugs had popped off somehow, screwed it back in and back to normal, thanks guys.
    that's crazy, i'm wondering how that would happen
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  16. #15 Re: Time for another swap? 
    Killa Bee Scottydoggs's Avatar
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    damn i knew that was a odd sound lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  17. #16 Re: Time for another swap? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    If that's an exhaust leak it should be very obvious and have a lot of carbon around the leak.

    I'm not so sure it's a leak, but start there since that's as good as anywhere else.

    Bill, doubting me are you??

    Hmmmmmmmmmmmmm.


    Exhaust leak, spark plug blown out = same thing right?

    I was damn close to real problem.

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