I have an 84 CJ7 6-258. It starts fine, runs fine.... sometimes. It seems that after it has been running a while the problems begin. It may cut out, may back fire, sometimes both. Once it cuts out it may restart, but then sometimes it has to sit a while before it will. It almost seems to me that when it warms up adjustments are made that throw things off. I'm handy, but not a true machanic. Any ideas? Thanks for any help.
Any number of things could be happening. When was the last time the engine was tuned up? Double check you timing and look at the condition of the spark plugs. Pay close attention to the plug insulators, what color are they? You could have something as simple as a vacuum leak that manifests itself after the engine has time to heat up.
Please take the time to fully fill out your profile, this helps going forward when you have questions for the forum.
Do you still have all the emissions components installed on your '84? Is the engine still stock with the Carter BBD carburetor?
Here is a great Web site that explains all the emissions equipment your CJ came with: http://home.sprynet.com/~dale02/home.htm Take the time to look over this information as it will teach you "what is what" under the hood. If you live in an area where you do not have to pass an emissions test you can remove most of that stuff. Plenty has been written here to help you remove the unnecessary items.
Do take the time to unsure your carb is not coming loose where it bolts to the manifold. You can also take some starting fluid and spray around the base, if the idle increases you have a vacuum leak. Look over all the vacuum lines and fittings for any cracks or disconnects. Any open ports are a bad thing.
'86 CJ7, 258, Carter BBD, Nutter'ed, TeamRush'ed, T-18, Twin Sticked Dana 300, D30 Frt-Pwr Lok L/S-4.10, AMC 20 Rear-Mosers-Detroit Locker-4.10, 2.5 BDS Lift, 1" Body Lift, 33" Wild Country M/Ts, Black Spoke wheels
'45 CJ2A, L134 Go Devil, T-90 Tranny, Warn O/D, T-18 T-Case, Dana 25 Frt, Dana 41 Rear, 531st CJ made
My 401 build: [url]http://www.jeepforum.com/forum/f8/trapshooters-401-build-1338277/[/url]
To all, thank you for the input. I'll check on these things and do some reading. No I have not Nuttered. I'm not real familiar with the process in Virgina and I don't know how hard the annual inspection guys will look at that.