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99 Honda Civic EX 1.6 VTEC SOHC question

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Old Aug 8, 2019
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99 Honda Civic EX 1.6 VTEC SOHC question

Does anyone know what this black box does?


What is this black box?
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

It's just under the intake manifold and has a vacuum tube running to it.
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

Anything other than a vacuum tube going to it? It is connected to the head? Kinda looks like it in that pic. Doesn't quite look OEM, to say the least.
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

i think thats the pcv valve breather
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

Originally Posted by Strick
It's just under the intake manifold and has a vacuum tube running to it.
It's below the head. And it's OEM for sure.
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

Originally Posted by Colin42
i think thats the pcv valve breather

I'd second what @Colin42 said.

Pull the hose off and see if that blue piece connected to it is the PCV valve.
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Old Aug 8, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

Forgot about pcv system. Likely that.
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Old Aug 9, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

Thanks guys. I'll go with the PCV system.
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Old Aug 11, 2019
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Re: 99 Honda Civic EX 1.6 VTEC SOHC question

I've got a lot to learn about this Honda.
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