Backfiring after installing K&N filter

[billwinkle]

Here is the stock air box vs. the K&N. and a picture of it installed.

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[dondonbabyraptor]

Here is the stock air box vs. the K&N. and a picture of it installed.

Honeycomb has been really in fashion lately. Such a nice design.

 

[FInoob]

My truck does it also.

"The reason for backfiring being common on a turbo vehicle is the fact that for all that extra air a turbo pushes into the engine it must also get more fuel. When your foot lets off the gas there is more raw unburnt fuel coming out of the cylinder head and flash igniting which causes the sound of a backfire"

 

[JaysOnTheEDGE]

 

[billwinkle]

My truck does it also.

"The reason for backfiring being common on a turbo vehicle is the fact that for all that extra air a turbo pushes into the engine it must also get more fuel. When your foot lets off the gas there is more raw unburnt fuel coming out of the cylinder head and flash igniting which causes the sound of a backfire"

I kind of figured that, but I still wanted to see if others had seen the same with theirs.

 

[HenryMac]

My truck does it also.

"The reason for backfiring being common on a turbo vehicle is the fact that for all that extra air a turbo pushes into the engine it must also get more fuel. When your foot lets off the gas there is more raw unburnt fuel coming out of the cylinder head and flash igniting which causes the sound of a backfire"

Could you provide a link to where you obtained this data?

Thanks

 

[Langwilliams]

Is the tune you're running factoring in the different air box? I thought the Ford performance tune came with a K&N replacement panel that kept the factory air box.

 

[Trigganometry]

Check that all your hoses in that general area are secure. If you got an air leak it could contribute to that.

 

[FInoob]

Could you provide a link to where you obtained this data?

Thanks

 

[billwinkle]

Yes all pipes are nice and tight. And it will take a few runs to get the computer to adjust to the new air flow or exhaust pressure.
Also I have blocked off about 60% of the interior intake box lid to see if it makes a difference. Will take it out tomorrow to see how it goes.

 

[Willcuts93]

Yes all pipes are nice and tight. And it will take a few runs to get the computer to adjust to the new air flow or exhaust pressure.
Also I have blocked off about 60% of the interior intake box lid to see if it makes a difference. Will take it out tomorrow to see how it goes.

Severe air restrictions in the intake will cause a backfire.
Edit. You can never have to much airflow but not enough is a big problem.

 

[Superdannyboy]

I still have stock exhaust. And it did not backfire until the cold air intake. I am thinking of closing off the lid. it has a filter and I do not like the idea of pulling hot engine air inside my intake.

Yes all pipes are nice and tight. And it will take a few runs to get the computer to adjust to the new air flow or exhaust pressure.
Also I have blocked off about 60% of the interior intake box lid to see if it makes a difference. Will take it out tomorrow to see how it goes.

What do you mean close off the lid? And why would it be pulling in hot air? This alone led me to believe you had the lid off. Which if I'm not mistaken is a ram intake, which sucks lol.

How did you block off 60% of the interior intake box lid?

I have a Mishimoto performance intake and filter with a MBRP exhaust and I unfortunately don't get any pops lol I would like one pop but not a whole crackling thing going on

 

[importfighter01]

What do you mean close off the lid? And why would it be pulling in hot air? This alone led me to believe you had the lid off. Which if I'm not mistaken is a ram intake, which sucks lol.

How did you block off 60% of the interior intake box lid?

I have a Mishimoto performance intake and filter with a MBRP exhaust and I unfortunately don't get any pops lol I would like one pop but not a whole crackling thing going on

The lid of the K&N is THE worst design of all Ranger intakes. It is an open element design, with a foam mesh in the lid as a pre-filter that allows the intake to gobble up gobs of 200+ deg engine air heat when the hood is closed. Funny, that’s not how they dynoed their test truck to get that +14 Hp they claim.

For all intents and purposes, it is a hot air intake. Might as well just strap a cone filter onto the end of the factory accordion intake tube for $50 vs the $300+ for the K&N intake.
Ingestion of that hot air is messing with the AFR and causing the backfires, no doubt.

 

[dondonbabyraptor]

The lid of the K&N is THE worst design of all Ranger intakes. It is an open element design, with a foam mesh in the lid as a pre-filter that allows the intake to gobble up gobs of 200+ deg engine air heat when the hood is closed. Funny, that’s not how they dynoed their test truck to get that +14 Hp they claim.

For all intents and purposes, it is a hot air intake. Might as well just strap a cone filter onto the end of the factory accordion intake tube for $50 vs the $300+ for the K&N intake.
Ingestion of that hot air is messing with the AFR and causing the backfires, no doubt.

Could you theoretically wrap it with heat wrap creating a better seal at the top to reduce the hot air ingestion? Sorry if it's a dumb question, just wondering.

 

[RANGER_MARC]

I installed the FPP tune but not the filter, no backfires. Hopefully someone with more knowledge can chime in but I don't think our trucks should be backfiring?

I did run the K&N for a couple of months after flashing the FFP tune but then returned to the stock Motorcraft filter, not because of any (noticeable) problems, but because I was concerned about the "freer-flow" K&N letting more particles "freely flow" into my engine.

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