Ford Focus Forum, Ford Focus ST Forum - View Single Post - Symptoms of a valve seat about to drop?
View Single Post
Old 02-07-2013, 08:36 PM   #14
mikebontoft
Derpy Cheetah
 
mikebontoft's Avatar
 
Join Date: Aug 2008
Fan#: 58647
Location: SLC, UT
What I Drive: 5.9L Grand Cherokee ZJ

Posts: 26,109
Points 23,309, Level 93
Points: 23,309, Level: 93 Points: 23,309, Level: 93 Points: 23,309, Level: 93
Level Up 96% Completed
Level up: 96% Level up: 96% Level up: 96%
Forum Activity 13%
Activity: 13% Activity: 13% Activity: 13%
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 - parting) | '90 Mazda 626 GT "Greenie" (2.2L turbo T3/T4 rebuild-sold) | '75 BMW 2002 "Carby" (resto-mod racecar) | '75 BMW 2002 (donor -sold) | '98 Jeep Grand Cherokee 5.9L (lifted and fast) | '99 BMW 328is (alt. daily).
Moderating General Chat Lounge, General Technical Chat, Ford Focus & General Car Chat, and Rocky Mountain Fanatics
mikebontoft is online now  
    Reply With Quote