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A little more help with the "old 258" please

279 Views 3 Replies 1 Participant Last post by **DONOTDELETE**, Apr 3, 2000

Discussion Starter · Apr 3, 2000

A little more help with the \"old 258\" please

Well after alot of work "and some money", I have a re-built head going back on my 86" 258, along with a new valve cover "no more plastic". I also got rid of the Carter BBD for a Carter from an earlier CJ. The head has been put back on and the intake should be on by the end of the week. The computer will be removed as well as all the "non-essential other things" My questions are as follows, exactly what needs too stay? I have the cooled intake with a few sensors on it, do any matter? Also I am interested in a vacume diagram, I will have the basics EGR, charcoal canister, PCV, I think that is all. and lastly in order to REALLY clean up the engine bay is it best to cut and remove all wires I will not need or leave them for future refrence? Thanks for all the help.

http://www.geocities.com/austnjpr/

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Discussion Starter · #2 · Apr 3, 2000

Re: A little more help with the \"old 258\" please

the things i can tell you i have done the same receently the things i did was a weber carb and the only thing that i kept hooked up was the thingy that was under the manifold and the water temp unit that is in back of the manifold and the charcol canister and the pvc valve rest just kinda got rid of

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TOM85CJ7

· #3 · Apr 3, 2000

Re: A little more help with the \"old 258\" please

Here is a vacuum hose diagram:
http://www.off-road.com/jeep/tech/258bbd/vacuhose.htm

This page covers most of the sensors and computer related items on the 258:
http://www.off-road.com/jeep/tech/258bbd/index.htm

I have re-done all of my hoses and checked all my sensors. I can explain what the sensors do and how the relay info to the computer if you have any questions. I have my '85 setup with the GM HEI and the stepper unplugged on the Carter. All of my other sensors are connected as they would have been from the factory. My CJ runs very well with this setup. Let me know if you have any questions.

Tom

1985 CJ7
4WheelDriveWeb

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Discussion Starter · #4 · Apr 3, 2000

Re: A little more help with the \"old 258\" please

Personally, unless you are looking for all out performance, I would run the egr and the air pump. They allow the combustion chamber to run cooler and dont hurt performance much if working properly. Now, I'm no expert on this, but from what I've seen they are OK. Plus, helps with smog problems, which in denver can be disgusting.
Bill

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