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MazdaSpeed 3 - Engine, Transmission & Driveline Discussion of engine, tranny and drivelines.


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 Old 06-12-2018, 10:09 PM   #1
 
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Default Knocking sound only on idle

Have this knocking sound.. only on idle. It rattles more now that I put in a downpipe. It rattles when the engine runs a little more on idle, and stops when it calms down. Don't know if that makes sense. Anybody have this before?
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 Old 06-13-2018, 04:37 AM   #2
 
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part out?
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 Old 06-13-2018, 05:30 AM   #3
 
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My old phone cant play it. Post a video to boob tube or throw some big ole titties up in here. How many miles and what mods do you have.
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 Old 06-13-2018, 07:23 AM   #4
 
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Geiger counter mod. lol
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 Old 06-13-2018, 01:09 PM   #5
 
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Ok ill get a link or something tonight. But basically have stage 2 cobb mods. Intake, inlet pipe, internals, dp, and im running full straight pipe too. I recently put in a dp but I had this sound before. If its only on idle, would it be my engine knocking or could it be something else? Oh and im at 112k miles.
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 Old 06-13-2018, 02:45 PM   #6
 
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Sounds like VVT noise to me.
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 Old 06-13-2018, 03:11 PM   #7
 
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Yea, I'd say either bad VVT or a bad pulley bearing. It's hard to tell from a video where the noise is coming from, so I'd take a long screwdriver and touch the tip to various parts and put your ear to the handle. Make sure you don't accidentally touch anything that moves! It'll be fairly obvious where it's coming from. If it's coming from near your oil cap that's your VVT shitting the bed. If it's coming from somewhere on the side of the block it's a pulley bearing. If it's coming from the block itself, plan your part out lol
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 Old 06-13-2018, 03:17 PM   #8
 
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Year of car would help, I doubt any gen 2 is having vvtissues
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 Old 06-13-2018, 03:44 PM   #9
 
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Its 2007. And isn't VVT noise only on start up?
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 Old 06-13-2018, 04:26 PM   #10
 
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Originally Posted by ZoomZoomT View Post
Its 2007. And isn't VVT noise only on start up?
Not necessarily. That *specific* startup issue was due to the VVT actuator not being able to pick up the slack in the chain and the chain slapping the valve cover. That's the warning sign your VVT is going out. It gets worse. Also, the chain itself can stretch. There's several parts to a VVT system. If the knocking sound was steady and varied in speed with RPM, that would be more indicative of a rod or bearing. Since it's more random, it seems more like a pulley or VVT (unless that random noise is actually bits of your engine internals flying around randomly). Do the screwdriver test.
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 Old 06-13-2018, 06:02 PM   #11
 
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Originally Posted by Solarsurge View Post
Not necessarily. That *specific* startup issue was due to the VVT actuator not being able to pick up the slack in the chain and the chain slapping the valve cover. That's the warning sign your VVT is going out. It gets worse. Also, the chain itself can stretch. There's several parts to a VVT system. If the knocking sound was steady and varied in speed with RPM, that would be more indicative of a rod or bearing. Since it's more random, it seems more like a pulley or VVT (unless that random noise is actually bits of your engine internals flying around randomly). Do the screwdriver test.
Ok thanks i'll look at it some more.
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 Old 06-13-2018, 06:04 PM   #12
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its a loose heat shield ya dummy, get your shit together
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 Old 06-13-2018, 06:33 PM   #13
 
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Originally Posted by Pu Manchu View Post
its a loose heat shield ya dummy, get your shit together
Or that hahaha. That falls under the "check exhaust" section

Like I always say...before you jump to conclusions check the small stuff first lol
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 Old 06-13-2018, 06:40 PM   #14
 
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Originally Posted by Pu Manchu View Post
its a loose heat shield ya dummy, get your shit together
I mean I just replaced the dp, so I took a few heat shields out so don't know what heat shield it could be. Not much left to look at.
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 Old 06-13-2018, 09:32 PM   #15
 
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When I hear knocking, it's usually girls wanting a ride.
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