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Old 05-15-2014, 08:13 AM   #1
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knocking sound after green filter

Hi guys! Does anyone had any issues after installing a performance air filter?

I just dropped in a Green Filter in my Focus SE '12 and noticed a knocking sound while throttle in low revs and also when changing gear it revs up it self.

Any thoughts?


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Old 05-15-2014, 09:10 AM   #2
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Quote:
Originally Posted by arcesala View Post
Hi guys! Does anyone had any issues after installing a performance air filter?

I just dropped in a Green Filter in my Focus SE '12 and noticed a knocking sound while throttle in low revs and also when changing gear it revs up it self.

Any thoughts?
Make sure you have everything connected correctly and the box is fully closed.
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Old 05-15-2014, 09:25 AM   #3
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Everything is as is should be! Only mod was the new filter...
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Old 05-15-2014, 09:28 AM   #4
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The knocking sound is exactly like on those old carburated cars when you move the dist to have an advance spark
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Old 05-15-2014, 11:08 AM   #5
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What octane fuel are you running ?

Go back to the stock filter and see if the issue goes away or if you may of got some bad gas ( low octane )

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Old 05-15-2014, 11:16 AM   #6
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That's what I tought... Issue is that I'm using the best gas here in CR :'( I might need to start using Torco to boost up the octane.

PS: this happened to me with a high compression engine I've had years ago in my beloved CRX...
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Old 05-15-2014, 11:39 AM   #7
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Did you touch the MAF at all? Check to see that you don't have a wire pinched between the air box and lid.
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Old 05-15-2014, 11:57 AM   #8
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I'll check that too but I think that in case of any maf or any other peripheral malfunction the computer should display a check engine.. isn't?
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Old 05-15-2014, 12:14 PM   #9
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Won't do that immediately, depending on the issue. Only displays immediately for MAJOR problems.

Last one I remember having this issue had a poor filter to air tube connection, but that was a partial aftermarket intake.
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Old 05-18-2014, 06:32 AM   #10
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The 'ticking' sund is the fuel injectors. They are easy to hear and sound like clattering lifters. Just not as loud.
The pressure inside them is very high, and each time they release fuel into the cylinder they 'Ping!'
So that may be what you are hearing. It is totally normal. and you may have just not heard it before.
All MK3 make that noise.

As for the rpm. yes that too is normal. If you have a manual tranny, the engine will rev up slightly when you push in the clutch. though it does not do it all the time..
I heard about this and watched mine. And yes under some conditions it automatically revs up about 300rpm when the clutch is pushed in.
But under other conditions the car does not. So it is some sort of engine management stuff.
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