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Strange Knock just started, please advise

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Old 02-12-2012, 12:07 AM   #1
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Strange Knock just started, please advise

Hey Guys,

I'm worried about a knock that I just noticed in the last week. It's coming from the driver side, seems to be top of motor but I can't tell for sure. I have had this 96 tacoma 3.4L for about 9 months. The previous owner said he ran synthetic and I run Mobile 1 5w30 with a M1 filter. The oil is super clean. I'm hoping this could be something other than a serious knock but need some advice. I have attached a video. Thanks for the help
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File Type: txt tacoma knock.txt (93 Bytes, 69 views)
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Old 02-12-2012, 09:37 AM   #2
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with the engine running do you hear it on the bottom end? You'd probably be best to use a stethoscope or long handled screwdriver to try to listen to the noise and determine where it's coming from. (ear on screwdriver technique). Sounds a bit like a bearing of some sort.
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Old 02-12-2012, 10:12 AM   #3
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Sounds almost like a loose lifter... I'd recommend having it checked as soon as possible...
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Old 02-12-2012, 10:38 AM   #4
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Kinda sounds like a spun rod bearing. Like scotrinaf said have it checked asap.
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Old 02-13-2012, 06:25 AM   #5
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Doesn't seem to be a spun rod bearing. My bro spun a rod bearing in his truck, and it knocked HARD and engin would not run. I only know what a spun bearing sounds like, but I would deff have it checked though.
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Old 02-13-2012, 10:15 AM   #6
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Definitely sounds like it could be something VERY BAD to me.
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Old 02-13-2012, 08:54 PM   #8
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Thanks for the replies guys. I figured out what it was today. I took uberjason's advice and used a screwdriver to try and narrow it down. (thanks for the tip dude, hadn't heard that before). Anyway, as i used the screwdriver I couldn't hear the knock internally so I started looking and listening and narrowed it down to the driver side valve cover. Turns out the #2 plug had turned (Loosened) almost all the way out and pushed the wire boot off it's seat. The noise was actually the compression coming out the spark plug hole. I tightened the plug back up and seated the boot and noise is gone. Thank goodness, I was a little nervous on this one. The reason I bought a Tacoma to avoid major problems. I've never had a plug do that on a vehicle so it was kinda strange. I'll keep my eye on it and make sure it doesn't loosen back up.
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Old 02-13-2012, 08:57 PM   #9
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i had that happen on my old 96 once after doing plugs,oddly on the drivers side as well.
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Old 02-13-2012, 09:19 PM   #10
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Weird, I think it has happened to me on motorcycles but never on one of my trucks.
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Old 02-13-2012, 09:21 PM   #11
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Where are you at? Wonder if its my old 96? LoL
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Old 02-13-2012, 09:59 PM   #12
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Well gotta say it sure doesn't sound like escaping compression to me & if the plug was loose & the plug wire was loose /off the plug, wheres the cylinder miss ? That motor should've been shaking & shuddering with even 1 misfire, but if you say thats what it is, so be it
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Old 02-14-2012, 02:34 AM   #13
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That's great news. I was kinda worried it would be a rod knock too. I've never heard anything quite like that so I wasn't sure what it is. It sounded kinda like a rod knock to me except the sound is much more hollow, not quite as low, and no double taps.
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Old 02-14-2012, 02:51 AM   #14
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Similar thing just happened to my 2000 4Runner. One night it was making a ticking noise (like a valvetrain noise), and the next day it shot the #3 spark plug out of the head, and took all the threads with it. The machine shop was able to heli-coil the spark plug hole, but you're lucky you caught that when you did.
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Old 02-14-2012, 10:31 AM   #15
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Quote:
Originally Posted by 4WD View Post
Well gotta say it sure doesn't sound like escaping compression to me & if the plug was loose & the plug wire was loose /off the plug, wheres the cylinder miss ? That motor should've been shaking & shuddering with even 1 misfire, but if you say thats what it is, so be it
Dude that's why I was so surprised. There was no misfire at all. The motor was running when I narrowed it to that plug cap. I pushed down on the cap and seated it back on the valve cover while it was running. As soon as I did that it sealed up and the noise was gone. It was probably only like an 1/8" off it's seat. I'm not positive, but the plug was probably about 3/4 the way out. Could have been less i guess but it was enough that air was getting by it. I'm just glad I caught it before it went any further and blew the plug, and threads, all the way out.
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