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Old 01-12-2014, 06:03 PM   #1
TBrown1992
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Performance Upgrades Help!

Hey all.. interesting scenario I have..

I don't know if anyone else is having this problem, but to paraphrase I have a 2012 Focus SE 5SPD Hatch. (Btw love how it runs with sport pack). Due to the recent holiday, I now have ROUSH cold air intake and ROUSH cat back exhaust.
currently, I only have the CAI installed, and recently I took my car into Ford for an engine sputter.. they said my intake was causing the engine to choke on air and it was running lean (no engine light, no code, they wired the computer to the car and told me thats what it was).
Now my questions are:
1) is that even normal? I thought these engines had enough computers in them to adapt to what is essentially a cotton filter and the top half of the airbox being cut open.
2) anyone else who has installed a CAI experienced a lean running engine? I figured thats not a common problem since cold airs are common sales, and ROUSH verified that it was designed for a stock tune with stock parts.
3) now im afraid to put in the cat-back.. I THOUGHT the CAI wouldnt be much of a mod and thought of the exhaust as the same, but with them saying my engine is running lean and its harmful, I dont know where to go with this..
4) finally, wouldn't a lean engine throw a code? Even a soft code?

Any help would be much appreciated.. I have no idea what to do with all of this various info, and I figured ifnanyone knew, it would be this community. Thanks a ton in advance..


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Old 01-12-2014, 08:08 PM   #2
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Sounds to me like they dont know what the issue is and blaming it on the intake....
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Old 01-12-2014, 08:32 PM   #3
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That's exactly what I think, but they're BS'ing me about how the air intake causes the engine to go past its pcm design and it wont adapt.
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Old 01-12-2014, 09:00 PM   #4
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I have the same intake, I agree sounds like they don't know what there talking about and the roush maintains factory warranty so they shouldn't give you a hard time. Good luck!
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Old 01-12-2014, 10:37 PM   #5
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What is this "engine sputter" exactly? Can you describe it? Also, did you disconnect the battery for a few minutes to reset the ECU?
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Old 01-12-2014, 11:04 PM   #6
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It kind of sounds like a problem of bad gas if it wasn't throwing any codes or any pending codes on a scanner.

Were you running 87 octane?
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Old 01-12-2014, 11:37 PM   #7
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1) Yeah roush guarantees it, but the dealership insists im the wrong one.
2) the easiest description is that about a minute after starting the car (war start, idle), the rpms will drop to about 300-400rpm and if you have the hood up the engine rattles in the bay.. I have an e focus mount so I expect it to be more stiff.
3) I run 91 octane due to the 87 giving a light knock.. which Ford calls "normal"
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Old 01-12-2014, 11:37 PM   #8
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I have the same air intake and at first it was making weird loud noises from the engine, but over the corse of 100 miles or so it went away. It works perfectly now and sounds amazing!
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Old 01-13-2014, 12:47 AM   #9
TBrown1992
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It's been about 1000 miles and it sounds amazing, but its the small intermittent sputter and Ford not helping me that makes me worry about my car having a computer problem and me blowing up my engine
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Old 01-13-2014, 07:53 AM   #10
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Try putting the old filter back in and and take it for a test drive if sputter is still there I would say try filling up with some new fresh gas. Your sputter sounds like it could be caused by fuel or spark. How many miles are on the car? I just had dealer do my plugs at 24k and they were black as night. So that would be my best guess.
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