pocket rocket
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| posted on 5/4/10 at 09:20 PM |
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can you de-cat a zetec se on standard ecu?
hey guys,
can you de-cat a zetec se run on the standard ecu?
the engine has a pre and post cat sensor and iv been told that if i just ditch the cat the engine won't run properly as the ecu takes info from
the post cat sensor and adjusts the fueling.
does anyone know if this is true? if so is there a way around this?
many thanks for all help and advise.
Dam...iv consused my ability with my intentions!
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big_wasa
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| posted on 5/4/10 at 09:27 PM |
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Yep its true it will throw a code to say the cat is buggered and may go into limp home mode.
you are able to get a device that tricks it in to thinking the cat is there.
edit.
Do a search for MIL Iliminator
or the bluefin
[Edited on 5/4/10 by big_wasa]
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britishtrident
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| posted on 6/4/10 at 11:41 AM |
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To explain a bit.
In normal closed loop running when up to temp a standard zirconia pre-cat sensor should give a varying output which flickers up and down between
about 0.1v and 0.84v --- the output is never constant. Mechanics often refer to this as the lambda sensor "switching".
Id the cat is working properly the post cat sensor however should give a fairly constant output.
After warm up the ECU looks to see if the pre-cat sensor signal is "switching" up and down and then compares it with the post cat
sensor. The two readings should almost never be the the same. If the readings are the same or similar the ECU flags up a fault code.
[Edited on 6/4/10 by britishtrident]
[Edited on 6/4/10 by britishtrident]
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pocket rocket
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| posted on 6/4/10 at 06:09 PM |
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thanks guys,
my next question is where can i get one of these o2 cheaters???
i had a look but they seem to be in the us 
can i make one? and if so how?
many thanks guys 
Dam...iv consused my ability with my intentions!
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iank
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| posted on 6/4/10 at 06:27 PM |
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Here's one (expensive for a couple of resistors and caps though).
http://www.ptp-ltd.co.uk/shop/258_111/mg_rover/mgf__mg_tf/exhaust_systems/mil_eliminator_(malfunction_indicator_lampcheck_engine_light).htm?
Reading the PDF it looks like a simple filter circuit, but I'm not an analogue electronics expert so wouldn't want to hazard guesses on
component values.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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