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Kevin86 01-27-2004 09:05 AM

CJ7 emmisions help
I just baught a 1983 jeep cj7 renegade. It has 258 I-6. I am getting ready to rebuild it. Almost none of the emmision control devices are hooked up, there are lose wires and vacume hoses all over, and several missing parts. After i get the engine rebuilt and put back in, what emmision systems are actually neccesary for my vehicle to run right? what parts can i leave off, in terms of vacume lines, and different emmision devices? i have come to the concluseion that the only parts that might effect the performanc of my engine are the spark advance system on the distributor, and mayber the EGR system. Am i correct?

dorfs 01-27-2004 09:22 AM

Re: CJ7 emmisions help
If you are planning on rebuilding it, I would just get a '92 to '95 4.0l from an XJ or ZJ and swap in the whole engine with fuel injection. About the same price, and a lot better performance.

texas1al 01-27-2004 12:48 PM

Re: CJ7 emmisions help
You're right, EGR has a significant effect on engine performance. As for electronic spark advance/retard - it probably makes sense to do a nutter bypass to take the computer completely out of the loop, especially if you're doing away with all the emmissions stuff and Carter BBD. If you remove all the sensors/emmissions equipment, the computer might try to play tricks with the timimg.

TOM85CJ7 01-27-2004 02:22 PM

Re: CJ7 emmisions help
All you need is vacuum for the Distributor and EGR. I use one of the coolant switches for my EGR. This keeps the valve from opening until the engine warms up. Plug all the other ports and you are in business.


OlllllllOCJ 01-27-2004 06:53 PM

Re: CJ7 emmisions help
If you have emmision checks in your area you might need some of it. Or if you just want to know what all that junk is and what it's supposed to do....

Look Here

Lots of interesting information and if you go through it you will find the "Nutter Bypass" too.

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