BAD knock...even when warm *VIDEO*
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BAD knock...even when warm *VIDEO* Last night I discovered a really bad knock that seems like it is coming from the driver's side of my engine towards the back. Does it when car is warm or cold. You can really hear when the rpms are falling down after revving it a little bit. Sounds like it is coming from towards the top of the engine but I can't tell for sure. I'm not really sure what a bad lifter sounds like but just guessing this sounds like a worse knock. No SES light. I'm about 99.9% sure its not an exhaust leak....plus its very loud and more mechanical sounding. Also Im pretty sure its not a bent pushrod just because its such a "heavy" knock. Also, oil pressure doesnt seem to fluctuate excessively or anything.
Heres a video to hear the sound. Theres not much to see cause its dark outside but you can really hear it. (Im holding the camera basically right above the driver head right in front of the cowl.
http://i154.photobucket.com/player.s...y/100_0189.flv
I'm very concerned that I'm looking at a bad engine knock or maybe something like a spun bearing. Any input would be greatly appreciated.
UPDATE: Another thing, I went out this morning and it seems like it has quieted almost. Its not as prominent as it was last night. I listened to it from cold to running temp and now it seems it is more of a tick than a knock.
I attempted to long piece of alum curtain rod to see if I could pinpoint the noise like a stethoscope but the best I could do was determine the noise is coming from the back of the engine near the end of the header flange. Also, (trying to make sense of this but can't) I got the absolute most prominent tick when I would lay the rod on either of the fuel rails.
Heres a video to hear the sound. Theres not much to see cause its dark outside but you can really hear it. (Im holding the camera basically right above the driver head right in front of the cowl.
http://i154.photobucket.com/player.s...y/100_0189.flv
I'm very concerned that I'm looking at a bad engine knock or maybe something like a spun bearing. Any input would be greatly appreciated.
UPDATE: Another thing, I went out this morning and it seems like it has quieted almost. Its not as prominent as it was last night. I listened to it from cold to running temp and now it seems it is more of a tick than a knock.
I attempted to long piece of alum curtain rod to see if I could pinpoint the noise like a stethoscope but the best I could do was determine the noise is coming from the back of the engine near the end of the header flange. Also, (trying to make sense of this but can't) I got the absolute most prominent tick when I would lay the rod on either of the fuel rails.
Last edited by rhinohuey; Jan 31, 2009 at 12:14 PM.
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Teching In
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Joined: Apr 2006
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From: Grand Rapids, Michigan
Pull your valve covers and check your valve springs. I thought I had a knock in my engine and it turned out to be a broken valve spring. Fixed it and it's good as new now!
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That's not a spun bearing. That is in the valvetrain. If it was an engine knock every time you loaded the motor up or increased RPM it would very audibly tell you it was a spun bearing. A spun bearing is-for the most part- unmistakable. It is a sound that will make you absolutely sick to hear.
As stated, pull the valve covers and start there. Sounds to be in the valvetrain but I do agree, it's kind of hard to hear in the video.
As stated, pull the valve covers and start there. Sounds to be in the valvetrain but I do agree, it's kind of hard to hear in the video.
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