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 02-13-2013, 01:37 AM   #28
mikebontoft
Aurelius Pardus
 
mikebontoft's Avatar
 
Join Date: Aug 2008
Fan#: 58647
Location: SLC, UT
What I Drive: 5.9L Grand Cherokee ZJ

Posts: 26,468
Points 23,783, Level 94
Points: 23,783, Level: 94 Points: 23,783, Level: 94 Points: 23,783, Level: 94
Level Up 44% Completed
Level up: 44% Level up: 44% Level up: 44%
Forum Activity 10%
Activity: 10% Activity: 10% Activity: 10%
FF Reputation: 76 mikebontoft Excellent Standing Member
Buy-Sell-Trade Rating: (3)
Now that I look at your code again, you said "bank one" not cylinder one. Sorry, I read it wrong.... though I'm surprised no one caught me on that.

Actually, looking at it again you called it cylinder one in a later post. that is incorrect.

Engine use each manifold as a bank. Since this 4 cylinder only has one manifold, there's only one bank. So, that means your whole engine is lean, not a single cylinder. It may very well be the IAC, though I'm surprised you haven't seen another code for the IAC position.

Make sure that gasket surface is clean. spotless. You probably tore up the old gasket and just reinstalled it. That's probably why it runs like crap now. Since you'll have to take it off now, its up to you to test or replace it.

Keep in mind this still doesn't change the fact that your intake manifold gasket(s) could be bad.
__________________
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