Jeep idles a little rough but runs great. Think I have a vacuum leak but just can't find it. Any tricks for locating a vacuum leak? I have a p0455 code and believe it has to do with this leak. Any thoughts or ideas?

 

get a can of carb cleaner, brake clean, or starting fluid, and with the jeep running,... spray in the suspected areas where a vacuum leak could be present. If the motor stumbles, idles differently, then you found your leak.

EDIT: P0455 is not a lean code

P0455: Evap emissions control system Large Leak Detected

Check your gas cap,.. if thats on tight, check the rubber lines from the the evap purge solenoid, to the evap canister, etc. you might want to take it to a shop so they can smoke the system and check for leaks

 

smoke test is the best and not that pricey.

 

resurrecting an old thread...i have this problem...but i know my valve cover is leaking a little...and I am sure I probably have the cracked header....would this be part of this emissions leak?...my purge is ok. and my lines seem ok...when I ran seafoam...smoke came from engine bay...so i was thinking the header?