I Might Just Know What I'm Talking About
Join Date: Sep 1999
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Re: Removing Emissions?
I'm surprised LEVE didn't say more about WHY you want to do this? [img]/wwwthreads_images/icons/wink.gif[/img] I think he's slipping. [img]/wwwthreads_images/icons/wink.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img]
The main goal is to have a Jeep that runs well, AND keeps our air fresh. We all have to breathe. [img]/wwwthreads_images/icons/cool.gif[/img]
Yes, the existing system on 87-90 YJs is troublesome, BUT there's no reason to just dump everything because it's "emissions stuff". [img]/wwwthreads_images/icons/crazy.gif[/img] A closed loop injection system is probably best, as it proably will make your jeep run the cleanest at all times, hot, cold, etc. If you don't like injection, or just don't have the $ for it, there is a lot you can do, and still stay clean.
Lose the BBD, go to a simple carb. There are a few options. I have the weber. Go to a better, simpler, ignition. I like the GM HEI. Most here seem to favor the TR upgrade. Be sure that your advance curve is correct for your engine - this has a lot to do with what your emissions are.
I took out the pulse air system and it's associated pipes, and the 3 solenoid things on the rear of the valve cover. Keep the EGR, as it will lower your NOx emissions. Keep the PCV. Keep the cat, as it lowers your emissions. Generic-fit cats be had for like $40 now. Go with a high-flow cat if you think the stock one will rob you of power. (I think this is a myth personally - a stock one is fine for a jeep, in my opinion.) Change your plugs, wires, cap, rotor, etc., on a regular basis. Check that your choke is operating properly. Most poorly running and polluting jeeps, in my opinion, are simply due to a lack of maintenance.
With all that said, my Jeep passes the new dynometer sniffer here in Massachusetts. [img]/wwwthreads_images/icons/smile.gif[/img] First time I went in my EGR valve was bad (I had no idea), and it had high NOx. I replaced it and passed no problem.
Not saying that you will pass if you do what I did, or if it's legal for you (my state has no visual, it's just gotta pass the sniffer).
Perhaps TR will chime in with his thoughts. He's much more knowledgeable than I.
Just my $0.02
"Everything I've got to offer, girl, is beneath this dirty hood." -- Bruce Springsteen.