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Were the mini cats the 200 cell cats you bought? Or did you bypass the rear cats?
"Mini cats" are extension tubes containing cat cells that are inserted into the rear O2 sensor hole with the actual O2 sensor screwing into this extension to avoid any MIL error.
So I installed the Paramount 200 cel sport catalytic converters and then the mini cats.
Thats when the discussion went into the facts about the minicats causing extra
rich fueling at high throttle openings.
I definitely do not want that so I took out the mini cats and will live with MIL warning light if and when It comes up. I will clear it tho when it happens.
To get thru emissions I will re-install them. No big deal.
Plus if and when the ECM tune that Cambo is working on comes out AND IF I can install it I should be very good indeed.
I am leaving my stock cats on after reading all of this!
Trust me - get rid of those horrible things , they are restrictive when new and when thay start to fail they are like a brick wall biult into the exhaust system .
Not at all what a performance engine needs .
I haven't seen a MIL at all yet in 3-4000km with 200cell cats . So it hardly worth worrying about . I'm starting to wonder though if the STR tune is more resilient to the sports cats than the XJR?
I'm starting to wonder though if the STR tune is more resilient to the sports cats than the XJR?
I don't see how it could be, the factory file that get's loaded into the ECU is exactly the same for the XJR & STR, exact same file.
Unless it's something to do with the emissions settings, perhaps the FED (USA) emissions settings are more picky about the Catalyst Efficiency than the Euro3 which is loaded in the UK-spec cars.
Could be somthing in that mine is ex Japan .
How long does it normally take two flag a MIL for cats ?
I thought if it was going to it would have by now ,
Also don't want to speak to soon .
Mine is monitoring 8 items
And I'm certain one of the is catalytic converters.
Sorry to hear your problems...
P0174 is running lean on one bank, the cats shouldn't cause this. The cats should bring up a P0420 'Catalyst Efficiency' code.
Sorry to hear your problems...
P0174 is running lean on one bank, the cats shouldn't cause this. The cats should bring up a P0420 'Catalyst Efficiency' code.
Could it be an O2 sensor. Maybe I should swap the lhs ones to the rhs and see whether the fault follows?
I was not having a problem before switching the cats.