Swapping from K&N cold air intake back to stock. The aftermarket intake came with the Jeep. But it seems I may be missing some items to make this work… see photos. I am not sure what else should be there to hold the intake box in place.
Going back to stock air filter assembly
- Thread starter Eleanor
- Start date
IIRC, just 3 bolts and nuts (and a filter).
Unless there's something different about a '99.
Remove the old CAI stud.
Unless there's something different about a '99.
Remove the old CAI stud.
Perfect. Needed to remove the stud. Now it fits just right. Thanks Longjp2!
Damn, I threw mine in the trash like 2 years ago. Didnt think there would be resale value. Ive got an airraid on my sons. Its a pain to get the oil cap but doeable. I would never think of going back to be honest unless you deal with water, High water, and Ive been over the hood with airaide. No lie back in the day. It did cough. Stock wouldnt. Man,,, I wish I wouldnt of thrown it away. Taking stuff off a 88 now and giving it to customer, they dont make this shit anymore
In my opinion aftermarket intakes are bad for the engine due to the amount of fine silica they allow past the media. When I get home later today I’ll snap you a photo of the crap in my intake manifold… and I had completely cleaned it out 3 months ago when I rebuilt the head, I can’t imagine what it would look like if more time had passed.
Not a daily, I drive my Jeep maybe 100-300 miles a month and 95% off-road.
You are exactly right. This shows the K&N Passing 18X more dirt, silica, etc. than an AC-Delco air filter during a series of ISO lab certified tests of various air filters. The K&N came in dead-last in its ability to filter dirt/silica out.
I also own and regularly ride a Polaris RZR. Those engines operate in extremely dirty environments. People who install K&N type filter replace their engines in fairly short order unless they just ride pavement (and why would you buy a RZR to ride pavement?) Now I do have a Spectre pre filter (oiled cotton filter identical to the K&N) at the intake between the seats. Modified the RZR for it to fit. It does a great job of capturing most of the dirt but it’s just there to prolong the life of the expensive Polaris paper filter.
Oiled filters can also contaminate a MAF sensor. I wouldn’t use them in any vehicle to replace a factory filter.
Oiled filters can also contaminate a MAF sensor. I wouldn’t use them in any vehicle to replace a factory filter.
Shop vac Might get that stuff there. Maybe rig up a temp solution (duct tape). reduce the vac hose to a 1/2 tubing that you can fish down into the plenum?
Smart move going back to stock! Your engine thanks you
Start the engine and spray the contents of a can of throttle body cleaner into the throttle body opening. Keep the rpms up a little.
Edit: I'd start by spraying maybe 1/4 of the can of throttle body cleaner into the engine at idle rpms which will cause the IAC (idle air control) to suck the cleaner in through itself. The IAC is what provides all of the engine's air at idle rpms and it can get dirty and cause a bad/rough/low idle. Keep the engine at idle rpms for this part of the job, restarting the engine each time it stalls from the cleaner having flooded the IAC which is a good thing. Once you've done this, raise the engine rpms up so the engine won't stall and finish emptying the can into the throttle body.
I assume this is all with the intake assembly disconnected from the throttle body correct?
Yes, just use a Philips head screwdriver to remove the big plastic tube from the top of the throttle body.
Wow, you guys just saved me from making the K&N mistake. I would have never guessed the K&N would have preformed so poorly. Thank you! BTW, I did remove the front tube from the Air Box. Any issues with that?
KennethS
TJ Expert
I don't think so. Years ago I was on a Ford car forum and learned that tube is an air silencer; removing it increased air flow with no detrimental issues other than more noise at full throttle.
Other than you'll make more noise and you lowered the level at which it will suck water, no.
Removing the TJ's air intake snorkel doesn't increase the volume of air since the snorkel was designed to easily flow all the engine can consume even at redline and WOT.
Removing it does nothing to help anything other than make it easier for water to get inside.
KennethS
TJ Expert
I'm not arguing the point, just wondering where you got that information.
The reason I ask is because a friend had issues climbing US-260 from Payson to the Mogollon rim (5800' to 7500' in 4 miles) and I mentioned the air silencer might be a restriction. After he removed it he was able to easily make the climb.
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