4.0 Throttle Body Conversion - JeepForum.com
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post #1 of 3 Old 10-12-2004, 01:17 PM Thread Starter
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1998 XJ Cherokee 
Join Date: Aug 2004
Location: Michigan
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4.0 Throttle Body Conversion

Well for the last month or so I have been looking up the conversion for the 2.5 throttle body to the 4.0. This car is my DD and I was wondering if this conversion is even worth it. Will I notice a difference in acceleration? Also this engine has 111k on it, will this hurt it at all in the long run? Anyone have any problems with the installation? Feel free to throw in any additional comments.


1998 Cherokee Classic - SOLD

1993 YJ - SOLD :(
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post #2 of 3 Old 10-12-2004, 01:25 PM
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The 4.0 throttle body won't hurt your engine, but you might not notice a huge difference in power. The throttle body is just bored out wider, which gets more air into the engine.

I've heard you need a spacer to put it in with no problems, and if you get one from a junkyard/used then make sure it has the sensors on it, but other than that, it should be painless. Most people that have done it say that they dont notice a big difference until they put a aftermarket intake in the jeep.

"Until you've learned to drive, you've never really learned how to swear."
-- Robert Paul

"I'm a 4-wheel-drive pickup type of guy. So is my wife."
-- Mike Greenwell, Baseball player

You dont change your jeep, your jeep changes you.
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post #3 of 3 Old 10-12-2004, 01:41 PM
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You don't need a spacer, it bolts right on. It works too. Search, this has been discussed a million times over.

My jeep has only ever killed 3 things, a cat, a deer, and my wallet. What's the problem officer?

1992 Red YJ. Lifted, locked, and loaded with beer (Disclaimer: This doesn't mean said driver endorses drinking and driving, please enjoy alcohol responsibly and do not operate any vehicle of any kind, thank you....)

Thanks to the price of gas here ($4.25 a gal) I just bought a mountain bike, 0" of lift, 0" of travel, MT's, locked rear axle, oh yeah, it's the sh#$.
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