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RussellZJ98 03-26-2013 03:28 PM

K&N Intake issues
I've been working on getting my jeep engine dialed in, and theres a few things that concern me that I'm trying to work out. First and foremost, my K&N intake. Ever since I put it on, I have noticed the sound is... interesting. It doesn't sound like air being sucked through a filter, there is almost a metal on metal grinding sound that comes from it. It gets louder as you accelerate. I have checked out multiple jeeps with variable intakes and they all seem to have the same "air being sucked through a filter" noise. Mine has a grind that I can't put my finger on, and does not sound like it should be there.

IAC, CPS, TPS all replaced within the last year. Engine has good oil in it. There does appear to be quite a bit of oil slung around the bottom of the jeep and has a noticeable amount of oil built up around the bell housing. Plan on getting all new seals eventually, but wheres the best place to start? Thinking the main seal will be first, but what would the list of things you would do to your engine to get it "up to speed," and the best order to fix these issues in.

In case it helps: K&N intake, Magnaflow cat, magnaflow muffler (Not as "jeepy" as the flow master super 40 was, i miss it)

bananaslug 03-26-2013 04:03 PM

Fel-Pro gaskets are the best.

Rear main, oil pan, valve cover, oil filter adapter, and oil pressure sender/switch are very common leaky points. Could also do the CCV/PCV thingys.

I just tossed my K&N. Ill be replacing it with an Amsoil one that is dry and actually filters.

Full tune up isnt a bad idea either.

Posting a video of the sound would help. It could be engine trouble, not the filter. Maybe take it to a mechanic and have him listen.

JapJohn 03-26-2013 05:18 PM

I have the same sound, a slight grinding on acceleration then it settles when you let off the gas. My noise is comming from the pasenger side.

It could be damn near impossible to see but you my have a crack in your down pipe where it connects to the header.

bananaslug 03-26-2013 05:46 PM

a cracked exhaust manifold would be noticeable and stinky. If it gets quiet after the engine heats up, then thats probably what it is.

RussellZJ98 03-27-2013 05:56 PM

I have a 4 day old header! No cracks. The problem is the same now as it was with 4 of 6 cracked down pipes. This backfire is driving me crazy. Vacuum lines are all correct. *scratching head*

gs69350 03-28-2013 08:08 AM

Had a buddy with a wierd backfire.... after pulling head, found badly "burnt" exhaust valve.

PolkaPower 03-28-2013 08:24 AM

Try this to see if you have a burnt valve. I don't think it's the K&N making the metal grinding sound as it has no moving parts. You can put the stock back on and see if it changes but I think thee is something else causing it. If it's a metal rattling sound then it may be the exhaust hitting someplace.

HighLonesome 03-28-2013 08:55 AM

I'd put the stock intake on first and see if the sound went away. :laugh:

bananaslug 03-28-2013 10:02 AM

Maybe your motor mounts are toast? that many cracks in a manifold is a lot. If the motor mount has no rubber it will crack the manifold and rattle around and will be worse on acceleration id think. :dunno:

RussellZJ98 03-28-2013 08:54 PM

Yeah I'm not concerned with the K&N itself, but the added airflow it does have let's me know something is wrong. Tried the napkin test. The engine would sound fine and have a constant flow out the exhaust, but would start popping and sputtering and would suck the napkin up. So it appears to have the signs, but the problem is intermittent.

The time now is 08:40 AM.

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