Removing Cats on a 2008 2.3L? - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

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  #26  
Old 12-05-2009
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Originally Posted by cheese_man View Post
i change the plugs before the snow fly`s to ensure sure fire starts every time
during our cold winter season
i cannot afford to let my plugs foul and suffer a no-start issue then miss work on top of that
when spark plugs are 5 dollars a package of 2 ( it is a wise investment )
ever tried to change plugs in minus 30 degrees with blowing snow
and in the dark to boot ( not a pretty picture )
I'd say not man. I hate cold weather. When it gets cold I move like Frankenstien's monster due to old nagging injuries. My 85 yearold Grandmother can get around better than I can and I turn 35 in July.
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  #27  
Old 12-06-2009
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Doesn't that mean alot of costly repairs at that point?
Why would you have costly repairs to contend with from triggering a P0420 with no converter? Like I've been saying, the P0420 just means the average amplitude of rear H02 voltage is too close (or equal too) that of the primary H02. OBD2s are programmed with a logarithm that compares the two under closed loop conditions. Considering the said-converter was removed, there is nothing to replace in order to eliminate the code.

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Originally Posted by knightmare1015 View Post
I'm pretty sure that the Oxygen sensors will indeed have to be replaced if he did do something like that.
Oxygen sensors will go bad if exposed to long term rich mixtures, leaded fuel or other "fun" fuels. If your adjusting mixtures or playing with "fun" fuels (E.G., how I use methanol) then you probably know enough to know you shouldn't have any catalysts in the exhaust stream. I've seen cases where a ECU was set for open-loop only and this has caused this as well (track conditions) If your running your daily driver in forced full-open loop mode you would see a HUGE decrease in fuel economy anyways.

Not to sound offensive, but I'm "pretty sure" you have alot to learn about OBD2.
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  #28  
Old 12-06-2009
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Correct me if I'm wrong, but once you do that doesn't it void the powertrain warranty unless done by an authorized ford tech? I'm pretty sure it does.
Removing a catalyst on a road driven vehicle in the USA is a federal crime, and no authorized dealer of any kind will do this in their right mind.

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Originally Posted by knightmare1015 View Post
I understand wanting better fuel economy but hollowing out the cats is the wrong way to go about doing it IMO.
Hollowing out the catalyst will make a negligible difference on even a vehicle that is tuned specifically to work optimally without a catalyst. The reduction in backpressure that everyone thinks is "magic" will only result in a better flowing exhaust system at high rpm when the catalyst is working the way it is designed. If your driving your vehicle in this RPM range (past the peak of the torque curve) you'd get much better economy by easing your foot up a bit.

I've got a friend with a Ford Escape 3.0. All 3 catalysts became ruined when the ECU failed and stopped signaling random coils in different cylinders. I scanned the OBD2 and found DTCs P0300, P0301, P0303, P0304, P0305 & P0306. I checked all the plugs, and coils myself to verify all were working correctly - he needed a new ECU, and 3 catalysts. Estimated repairs were ~4000$. After replacing the ECU I hollowed out the existing destroyed catalysts to allow for exhaust flow. After using 10$ in defoulers the vehicle was working perfect, and only cost abou 1000$-1200$ to repair, instead of 4000$. Fuel economy stayed the same, and there was no noticeable increase in performance other than the vehicle would actually go faster than 20mph where the backpressure before was limiting it to that.

Last edited by Jp7; 12-06-2009 at 04:18 AM.
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  #29  
Old 12-06-2009
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Oh ok. I thought he was talking about a full blown back up mode like on a home computer system, not limp mode. Limp mode sucks to me. That means goodbye to what's in my bank qccount at that point.
No, limp mode is what prevents it from emptying your bank account. Retarded timing, generous fuel and low rpm prevent catastrophic failures when something is wrong.
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