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DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

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Old 11-20-2017, 09:24 PM   #31
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THANK YOU THANK YOU THANK YOU!!!

I used these instructions to replace the air filter on my 410,790 km Focus a week ago, and it has made SUCH a difference! First of all, I'm so happy that the price is less than HALF the cost of a replacement (non-OEM) filter.

The difference in noise is slight. There's a definite induction sound at startup, but it disappears as the car warms up, or when I start driving. There's also a bit more growl to the engine.

The biggest difference is in performance. Each gear is smoother. Getting going in 1st is SO much easier! I used to complain about how tall 1st gear was, but this has really improved matters. Acceleration is much smoother throughout the RPM range.

I don't have enough data to speak to fuel economy.

Last, I just want to point out I almost never use all caps. This is just how excited/happy I am. I feel like I have a whole new car!

Oh yeah, I made a YouTube video about the old air filter: https://www.youtube.com/watch?v=PSAGblYZu30
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Old 11-20-2017, 09:58 PM   #32
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lmao i'm tempted to do this but im a cheap ass and i know where there is a rolled over 2013 with its engine still in it at a local yard i may swing over there and see if i cant harvest that coupler and just grab a filter from rock auto for $10
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Old 11-20-2017, 10:39 PM   #33
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I'd like to see a side by side dyno comparison from OEM and with a snorkel delete but still seems worthy regardless.
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Old 12-19-2017, 10:34 PM   #34
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Hello. Did this mod today, however instead using a Spectre air filter i had laying around. I am also getting the P0171 code in my car, and nothing else has changed. I got this code just about 3 miles after I installed the filter. this install is definitely the cause. I don't think it's hurting the car however. I would just like to figure out how to get the code to shut off.
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Old 12-20-2017, 08:35 AM   #35
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Quote:
Originally Posted by mikeca9 View Post
I resolved mine--at least so far this morning!--by following the ECU reset directions here.
Can you pm me the directions, the link isn't working.

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Old 12-20-2017, 09:43 AM   #36
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Quote:
Originally Posted by Digital Dad View Post
Can you pm me the directions, the link isn't working.
From the http://www.focusfanatics.com/forum/3502979-post2.html link:

Quote:
Originally Posted by whynotthinkwhynot View Post
Eh, on 05+ or any thing with the Duratec engine, the PCV is a PITA to replace. Yes it's behind the intake manifold below the throttle body. You should be able to see it from under the vehicle. If the hose is bad, then you'll have to purchase a molded hose to replace the factory hose. I don't know if the PCV itself is replaceable.

What I would do first is see if the problem can be cured by more simple means. First, remove the spark plugs, check gap, and clean. If you feel the need to replace, we've found that Autolite plugs one step colder than recommended (103, 104= recommended) are better. Always check gap: pre-gapped plugs are an urban legend. Also double check the condition of your spark plug boots. These are replaceable, and one bad boot that wasn't firing all the time would lead your ECU to overcorrect the air/fuel mix which might result in a lean condition at the O2 sensor.

That's not the most likely culprit, the most likely culprit is the MAF. Use a torx driver, T25 I think, to remove the MAF. The plug is removed by sliding the red lock back, then pressing the now exposed clip down. It should remove without any muscle- if you have to grunt, you're doing something wrong- get a flashlight and check it. Once it's removed, use a can of spray MAF cleaner to carefully blast cleaner in the openings in the side of the MAF. Then re-install after giving it sufficient time to dry.

Now that you've done that, drive around until the engine is warm. It's time to reset the ECU. Remove the neg battery terminal for 10 minutes. Replace and start the engine. Allow the engine to idle for 6-7 minutes- or until the idle drops to 750 where it should be. That's how the ECU tests for the optimal A/F ratio. Idle during that test should be about 1k rpm. Don't touch the accelerator. The ECU times this test at 5 minutes after the engine has dropped out of cold start (open loop) mode.

Now wait and see if the DTC pops back up. Hopefully not. I think my PCV line has been bad forever, and I don't have a DTC related to it. The idle is just slightly rough, and it's either always too cold to fix or I'm working too much at the time.
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Old 12-20-2017, 09:52 AM   #37
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Well I finally got around to sourcing a 2012-15 MAF tube, about $5 from a local JY and maybe around $17 for a Motorcraft 2012-15 air filter from Amazon. Install was a breeze and I didn't have to do any bending of parts as I installed the MAF tube onto the air filter first then put the assembly in.

Everything seems good except for the fact that I have had a persistent P0171 code (engine running lean) even after doing the above quoted reset procedure and have a terrible noise on cold start that goes away after warmed up then any additional noise is manageable with the stereo :). That code was not there before doing the mod so I believe it directly related to it.

I have a theory on the P0171 code due to the larger MAF diameter it is allowing much more air through but the computer is calibrated to calculate the air based on the original MAF tube hence the lean condition (which is backed up due to fuel trims (at steady engine and vehicle speeds) being in the +8-10 range according to Torque). Also could it be possibly related to the increased noise when the engine is cold perhaps an imperfect seal between the MAF and tube due to the stock seal on the MAF sensor being worn? Or perhaps something else causing it I have not considered?
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Old 12-20-2017, 10:26 AM   #38
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Have you tried switching back to the original filter set up just to see if the issue persists? It may just have been coincidental that it is happening now. And unless you switch it back you will never know for certain.
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Old 03-01-2018, 03:15 AM   #39
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yes i realize im resurecting a old thread.

has anybody figured out whats trigering the P0171 code? is it hitting everybody that does this mod or just some?

i got the adapter myself and a filter sitting here ready to be installed until my true CIA arrives in a few weeks to a month (budget gets in the way of the mods i want to do).
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Old 03-01-2018, 07:07 AM   #40
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Quote:
Originally Posted by huntingdmouse View Post
yes i realize im resurecting a old thread.

has anybody figured out whats trigering the P0171 code? is it hitting everybody that does this mod or just some?

i got the adapter myself and a filter sitting here ready to be installed until my true CIA arrives in a few weeks to a month (budget gets in the way of the mods i want to do).
Even though I started this thread, the more I think about it, the more I think it might be the difference between the original tube size vs the new one, or possible not enough restriction that the factory setup gave

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