NitroGoat

just picked up a 99+ intake manifold for my 97 cherokee.

Just wondering what else I will need to run that intake. It has the fuel rail and injectors on it as well.

I noticed someone had a fuel pressure regulator along with that intake and they had upped the pressure but I cant remember where I found that info at.

Any more info would be great

93XJLI

re-use everything on your jeep 'cept the new intake. buy new o-rings for the injectors- youll need 12.

offroadnut36

What brand intake is it? Show us a picture. and Why would he need new o-rings for the injectors?

BlueXJ

It is just the same as any other intake except it has smoother turns and flows a little better.
Offroad when you pull an injector for any reason ALWAYS use new o-rings. You don't want any chance of leaks with fuel and especially fuel under pressure.

nick_n_ii

Intake pic for reference.. The white one is the '99 or newer the far left is a Renix and the middle is the HO.

nick_n_ii

See it makes for a better flow and quit the HP and Torq boost. You'll probably need the 99 or newer power steering bracket also..

offroadnut36

oh, my bad. I thought he was talking about air intakes.

BuckB91XJ

I think I am going to look into getting one of the newer intake manifolds for my 91 XJ. Are these found on just the 99+ ? I read elsewhere that the good manifolds were on the 97+.

98 JeepJeep

Do replace the O-rings because i had a severe vaccum leak from the injectors after removal/re-install on my XJ ......I thought i would get lucky...I DIDNT...Napa auto sells the kits....Each kit comes with a couple O-rings and a pintle cap..so it works for alot of Bosch Injectors.....3-Kits will take care of you. Please keep us updated on the power difference....As i have read around 15-20hp Gain. and the 99+ have better injectors!!

nick_n_ii

Yep there found on the 99+, but you can use the one from the WJ and as far as I know the TJ also. So you don't have to just get one from a XJ...

BuckB91XJ

So, get the injectors with the new manifold and re-use everything else off of my HO manifold then? Sounds like a pretty easy swap for a 20 HP gain. Should be relatively inexpensive, too, if I can find one in the JY.

prerunner1982

I think Nick is right about the power steering.. I read an article in one of my mags that they had to run a new powersteering pump and stuff.. I will see if I can find it.

Didnt find the magazine article but I did find a writeup on another site.. http://www.mallcrawlin.com/forum/showthread.php?t=6355

I believe this is where Nick got the comparison picture as well. This write up also states that modifications are required to the power steering to work with the new intake.

Also, Nitrogoat... you didnt mention where you got the intake or what the previous owner may have used it for. In the link above they mentioned an additional fuel pressure regulator required since the newer injectors require a higher pressure (49psi)

93XJLI

The OP wont.

YOU need the PS pump and bracket. IIRC it was in 96 when Jeep switched everything over to the new style. And 20 hp? I dunno about that. I know that mallcrawlin article has a dyno run on it but I didnt feel a 20hp at the wheels gain- maybe ~10.

NitroGoat

yea I was wanting to use the 99 injectors and up the fuel pressure with a new regulator

93XJLI

just re-use all your old stuff. the heads, timing, and all that other fun stuff changed a tiny bit throughout the years and using a different pressure regulator with the wrong injectors, etc, may mess up a few things a bit.