boeingxtreme

So my 88 XJ, 4.0, It began running rough with misfires and baffled pops randomly, we replaced the cap and rotor and plugs and wires, plugs definetly needed a change. That fixed the problem for a while. Then we changed the fuel filter which was very clogged, that helped, now its running its missing so bad and idling rough and popping its almost not able to drive but its not constant, it'll snap out of it and then come back randomly. What could be doing this? I ordered an Ignition Coil at napa but haven't paid yet. Its like $57 should I go ahead and change this? Almost out of ideas. Next thing I could think is a fuel pump but I just don't know anymore. Jeep has 207K on it. Sometimes too you'll come to a stop and itll be at like 700rpm running fine, other times its at like 400 barely running and shaking too.

Any Help Would be appreiciated.

austinjoe13

EGR solenoid. My step mom's mini van did the same thing. Does it feel under powered? And when you get to a stoplight and it dies down, shift into neutral.

elevol92

Check all vac lines, I have an 88 as well and my map sensor vac line cracked a bit. Also give your throttle body a good cleaning, do the simple stuff first before throwing parts at it

boeingxtreme

Yeah when it kicks into its little fit, it feels sluggish and underpower. But when its acting fine, as power and accelerates fine, idles fine. And Thats exactly what I do, throw it in neutral at a light and stay in it a little when its acting up.

So check throttle body and the sensors on the throttle body. I cleaned throttle body once before and the Intake had some oil in it that came from the PCV. Probably not a good sign. Ive had the jeep about 6K Miles. Had it a year, keeps getting worse, it was fine when I got it.

austinjoe13

Either go to a junk yard and pull one or get rid of the EGR system entirely. I'd put money on this being the fix. You know, if I had any

boeingxtreme

LOL Some genius of a PO went through and cut some Vacuum lines and re ran them, it ran good for a few months, then started acting, ill have to find out about this EGR deal, thats the last thing that old cherokee would have.

je4reyk

Also check your wiring harness and the plug (c101) bulkhead connector ,my 88 was having issues . It turned out that the bulkhead connector was causing all sorts of problems,finely had to deleate the connector ,made a bid difference.

ubnormal_ua

also TPS may cause of problems.

btw egr solenoid may be replaced with metal piece with 2 holes for a mount bolts.

je4reyk

Before pulling the EGR off do a vacuum test on it. If you live in a smog control area you need to leave it in place and have it operational

reyeskid

what would you recommend to clean the throttle body with? just wondering because i intend to do the same

elevol92

Any throttle body cleaner, I use the CRC cleaner

boeingxtreme

Ok I don't think it's ever been taken apart. Still has black tar stuff like other threads say so ill clean it.

boeingxtreme

Alright. I'm not in a smog area. Indianapolis. Someone deleted the cat too on the jeep but o2 sensors all there.

austinjoe13

An EGR delete can be as simple as plugging the vacuum line on the valve. You could kink the larger diameter line and zip tie it to stay.

ubnormal_ua

it works only if valve have no damage from inside.
in my case egr wave have internal burnout, so even when it closet it pass exhausted into intake.