Ok. I have a 86 CJ7 with 258.. The jeep ran fine except for a little miss. I decided to tune it up with new basic autolite plugs/plug wires/distrubutor cap/rotor button and fuel filter. got done replacing everything and decided I probably should have let it alone. Now the thing runs VERY rough (missing)and VERY rich??? Why would this happen?? It seems to be missing almost like its out of time? but why all the sudden would it do this?? Do I have to re punch the distributor? I checked and tripple checked all connections and
I have been messing with this thing all day and had to quit before I put a bullet in it.. Please help if you can!!
With owning Jeeps for over 20 years, I have found with the stock ignition to use only Champion copper plugs. My sister had a tune up done on her 96 Cherokee and they used Autolite plugs. It ran like crap, they wanted to do other work. I told them to replace the plugs with Champions. If it didn't fix the issue I would pay for for the new plugs a labor. Well, it fixed this issue.
ok.. I took out the PCV valve and it wil run kinda ok but you obviously gotta keep your foot on it to keep it running.. i shook the valve and it still rattles however when I put the vaccum hose on the valve while the jeep is running it kills it.. I have no idea what the hell changed on this thing.
Do you have a vacuum gauge to check for leaks and to use as a diagnostic tool? You may have dislodged a vacuum hose or one of them could have been dry rotted and was about to go and fiddling in and around the engine may have finally cracked it open.
so you pull the vac hose to the pcv and it runs, you plug/install it and it dies?. kinda go's against the basics. do you have an EGR valve? if so make sure it is closed and not hung open and leaking air . im with the majority, it must be in the area you were working, cap, rotor, wires, plugs. "no good deed go's unpunished", you didnt think that your jeep was going to thank you for a little TLC did you?. you will find it, it will be somthing simple. check the nipple inside the cap that conducts the coil voltage to the rotor. consider new parts as "bad". look at cap/rotor closely. ok so i read your first post again, is the choke closed?. this would create a "runs better with vac leak symptom". is the choke working properly?, rich condition is absolutely carb, it missed before the tune, do a compression check or have someone keep it running and pull plug wires one by one to isolate the bad cyls if there are any. yes you may get a little shock but shock therapy has been found to be productive in some human faults.