Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Symptoms of a valve seat about to drop?
View Single Post
Old 02-07-2013, 09:36 PM   #14
mikebontoft
Aurelius Pardus
 
mikebontoft's Avatar
 
Join Date: Aug 2008
Fan#: 58647
Location: SLC, UT
What I Drive: 5.9L Grand Cherokee ZJ

Posts: 26,274
Points 23,532, Level 94
Points: 23,532, Level: 94 Points: 23,532, Level: 94 Points: 23,532, Level: 94
Level Up 19% Completed
Level up: 19% Level up: 19% Level up: 19%
Forum Activity 17%
Activity: 17% Activity: 17% Activity: 17%
FF Reputation: 76 mikebontoft Excellent Standing Member
Buy-Sell-Trade Rating: (3)
It can drop on any.

I still don't think it's a seat issue. It wouldn't run lean on that cylinder anyway, it would run rich.

I would be looking for an intake manifold leak if it's on a single cylinder. of course, just because it only has the code for one cylinder doesnt mean it's the only one.

For the record, mine would randomly run like crap no matter if it was warm or cold. During warmup enrichment, there's quite a bit of extra fuel (hence the enrichment). Enough that it may not make a small leak noticeable.

Time to grab a can of carb cleaner or something similar and spray around the intake manifold. (and any other vacuum source for that matter).
__________________
SR #127 | '02 Focus SE "Foci" (5.0 RWD - parted) | '75 BMW 2002 "Carby" (racecar) | '98 Jeep Grand Cherokee 5.9L (lifted and fast) | '99 BMW 328is (daily).
ModeratingGeneral Chat Lounge, General Technical Chat, Ford Focus & General Car Chat, and Rocky Mountain Fanatics
mikebontoft is offline  
    Reply With Quote