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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 04-20-2015, 01:56 PM   #1
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D23 PZEV Durability

I am the original owner of a 2003 2.3L PZEV with 86K. I replaced the alternator($800) at 65K and the thermostat at 69K. I have always used synthetic oil. What kind of miles do these engines usually get before major mechanical issues? How does the emission equipment hold up? When did you have to change the $400 air filter? Still have the original serpentine belt.


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Old 04-20-2015, 02:07 PM   #2
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Also replaced a motor mount at 33K. With the ATX, mileage has been mediocre-21MPG city even with taller 205/55 tires. Also replaced lighting module($900) at 70K.
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Old 04-20-2015, 06:28 PM   #3
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2004 PZEV 2.3L with 192k miles. Replaced serpentine belt and spark plugs once. That's all! Original transmission and clutch too. Used Mobil 1 15,000 mile full synthetic (gold cap). These motors have been known to go 300k.
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Old 04-21-2015, 02:54 AM   #4
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I know City mileage is infinitely variable, but even with an ATX that's a little low.

Haven't calculated those larger tires for diameter, but if they ARE larger diameter you'd be going more miles than it registers, reducing reported MPG.
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Old 04-21-2015, 11:50 AM   #5
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Taller tires in a lot of stop and go will also hurt mileage because they require more power to get rolling.
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Old 04-21-2015, 01:00 PM   #6
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It got the same mileage with 205/50's. I hoped the taller tire would be like reducing the axle ratio numerically.
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Old 04-21-2015, 01:02 PM   #7
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Did anyone ever come up with a cheaper replacement for the $400 air filter? Here in CA, CAI aren't legal? Will the emission system hold up for 150-200K miles-it seems to be complex with 2 converters.
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Old 04-21-2015, 03:56 PM   #8
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Quote:
Originally Posted by oldman View Post
Did anyone ever come up with a cheaper replacement for the $400 air filter? Here in CA, CAI aren't legal? Will the emission system hold up for 150-200K miles-it seems to be complex with 2 converters.
Do they match the CAI to the exact year/model focus? Both of these have carb stickers on them and fit your duratec but neither list your year

57-2559 - K&N 57 Series FIPK, Performance Intake Kit

Not sold any more but turn up used every once in a while:
http://arb.ca.gov/msprog/aftermkt/devices/eo/D-594.pdf
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Old 04-21-2015, 08:05 PM   #9
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I hope our 2004 ZTS 2.3 lasts til 300k. Not having to worry about a timing belt is comforting to me as well.

We replaced the clutch at 87K then gave it to my 21 year old son for Christmas. Told him I'll rip his face off if he disrespected it.

We'll see what happens.

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Old 04-21-2015, 09:13 PM   #10
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There's an aftermarket (Dorman) replacement filter box for '05-'07 that at least one I've seen tried on an earlier car with good results.

It uses a slide in flat filter so you can then change filters.
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