I have '77 CJ 5 258, used to be a 1bbl, now after many years of upgrading its flourished into a rebuilt engine (Several years back) and more. Built now to '79 specs w/ 2 bbl cam, and now a Holley 4bbl 390 CFM.
When I had 1st got him ("Mr. Jeep") Had a YF 1bbl, the entrance of the PCV steel line into the intake was MEGA RESTRICTED with grey hard carbon (almost looked like it was metal!)---I took apart and cleaned everything in that vicinity.
Now that the air was coming thru good, I had to re-tweak my carb, cause mix was wrong at idle--from previous Tweak to make it idle.I do not know what you do with your Jeep, But I LOVE BOTH OF MINE! If you investigate CJ 5 & CJ 7 Forums (if you still can, with this new Site Retrofit) See a CJ 7 from months ago, Its something like this, "1985 CJ 7 STALLS WHEN HOT"---If you can pick thru and De-cypher my Country-boy fixin' it might aid you in some way---maybe even get idle speed back to normal and "Off the Mains"--and back on the Idle Circuit again----should you be on them now. If you hit my username link and reply back with a Message there, that stuff may help some with other stuff too!
Here if you ever need me
Thursday, November 18th, 2010 AT 10:12 PM