rangermonroe

Hose the area down with ether and see if the engine races. Never actually done it, but have been told that by my elders with enough consistency that I would do it myself. It beats tearing crap apart tonight. Just remember to save some for "date night" with the wife.

dave1123

Easier yet. Just plug the hose and see if it makes a difference. As far as I know, the vacuum tank is only there for the cruise control and to close the heater doors on shutdown.

Ferrel

So, yesterday I pulled the fuel rail and cleaned as much as i could with carb cleaner. It was nasty. Didn't push any through the injectors cause I didn't have a rig handy to hook up, but cleaned up everything as well as I could. It's alot happier now, but not fixed. Didn't have high hopes there, but thought I'd report that actually pulling the fuel rail off and cleaning everything helps pep up a jeep.

Btw, I did pull the vacuum canister and put a new hose on it. Yet again, didn't fix anything, but it made me feel better about it.

dave1123

IMHO, if the fuel rail was crappy, I'd assume the injectors are also. I don't think your fuel filter was doing much or was bypassing an awful lot. I can't remember if this jeep is one of those with just an internal tank filter or not, but if it is, I'd install an in-line filter as well.

I'd still change the injectors, even with a JY set.

Ferrel

It does have an inline filter. It's been changed a couple of times. I just dropped from two full time jobs to one so I should have some time to get to a JY and get myself another set of injectors. With the seals only being 10 bucks I thought I'd clean up what I could for now. I'm in the process of getting a Honda so this doesn't have to be the DD. (And so I can actually get to the JY to get parts for the jeep.) I'll keep you updated.

Red River T

Dave, FYI: 97's and whichever, 96 or 98, have the 2 screens on the bottom of the pump and then on top of the module, outside of the tank, there is a metal canister that contains the regulator and a filter element above it. I think I posted a picture of the one out of my 97.

edit: I found the thread:

https://www.cherokeeforum.com/f5/fil...answer-206779/

dave1123

Yes, I saw that when you posted it. It gets confusing because I don't own a ZJ anymore. I only had that one for little more than a year because the "frame" broke. The unit body was perforated with rust at all 8 control arm mounting points.

I fell in love with a pretty face without looking at her body. She had been owned by 2 soldiers and ridden hard. I should have known better, but the price was right. They were being deployed and had to sell it. It was a '97, 4.0, 242 with tow package. $1200 in 2010. 185K miles. Dark Rosewood.

Ferrel

just an update, replaced the map sensor, didn't fix it, but did make an interesting change to the symptoms. Miss still comes but only once the jeep warms up. Till then it does okay. After it warms up it barely idles for the missing.

dave1123

To isolate a vacuum leak, use a propane torch, NOT LIT, just crack open the valve and play it around suspected areas. If the engine speeds up, that's where your leak is. I used to use ether as well, until a spark plug lit it off on me. OH, and WD40 is flammable as well and uses propane for propellant. A friend of mine set fire to his Dodge Caravan by spraying his heater blower motor with WD40 while it was running!

Ferrel

Am I supposed to have an egr valve? I need to look tomorrow, but from what I can see of where it's supposed to be, there's a plate there.