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janfi67 · 15th May 2008, 17:24

Very interresting question.

If I've understood how the FAP system is working (not so easy because of lack of good technical documentation), a FAP has really to be changed (or correctly cleaned) after some km, unlike a Kat which could last 10 years and many many km.

The main reason would be the Cerium contained in the fuel additive does not burn like carbon particles but remains in the filter and clogs it.

And there is nothing to do against that. The cerium quantity in the FAP is directly related to the fuel quantity burned in the engine. I guess someone with a low consumption should have the low additive warning after 80.000 or 120.000 Km and his FAP should last longer also. And if someone is always full throttle, it should have it before.

But I'm pretty sure the particles themselves, because they don't burn at 100%, clog also the filter. So the FAP life duration is probably affected by the driving style..

And in my opinion, there is no need to change the FAP before the message "FAP clogged" appears. The engine calculator, with differential pressure sensor around the FAP monitors in real-time the FAP efficiency and while there is no alarm, why change?.

but it's only thoughts and I would be curious to know what happen in real life, especially if it is common to drive more than 80000 or 120000Km without having the FAP clogged and an alarm.

15th May 2008, 17:24	#2 (permalink)
janfi67 Wizard Join Date: 06 Feb 2006 Location: Strasbourg Age: 45 Posts: 298 Thanks: 0 Thanked 23 Times in 11 Posts Car: 807 Norwest 2.2 HDI Engine: 2.2 HDI/JTD Country of origin:	Very interresting question. If I've understood how the FAP system is working (not so easy because of lack of good technical documentation), a FAP has really to be changed (or correctly cleaned) after some km, unlike a Kat which could last 10 years and many many km. The main reason would be the Cerium contained in the fuel additive does not burn like carbon particles but remains in the filter and clogs it. And there is nothing to do against that. The cerium quantity in the FAP is directly related to the fuel quantity burned in the engine. I guess someone with a low consumption should have the low additive warning after 80.000 or 120.000 Km and his FAP should last longer also. And if someone is always full throttle, it should have it before. But I'm pretty sure the particles themselves, because they don't burn at 100%, clog also the filter. So the FAP life duration is probably affected by the driving style.. And in my opinion, there is no need to change the FAP before the message "FAP clogged" appears. The engine calculator, with differential pressure sensor around the FAP monitors in real-time the FAP efficiency and while there is no alarm, why change?. but it's only thoughts and I would be curious to know what happen in real life, especially if it is common to drive more than 80000 or 120000Km without having the FAP clogged and an alarm. Last edited by janfi67; 15th May 2008 at 17:29.
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