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Topic: Blocked Cat (Read 329 times) |
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Alastair
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2.3 Ghia X & MGB Roadster
Posts: 129
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Blocked Cat
« on: Jul 31st, 2007, 9:30am » |
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What would the symptoms be, as far as the running of the car, if the cat was "blocked" and what would have caused the blockage. My only previous problem with a cat was when the insides collapsed and rattled but did not affect the emissions for the MOT funnily enough.
Can these be "unblocked" or are we talking new cat
2.3 16 valve DOHC
Thanks
Alastair
Alastair
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scorpio_man
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Ford Kuga awd
Posts: 5654
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Re: Blocked Cat
« Reply #1 on: Jul 31st, 2007, 8:59pm » |
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hi there
one of the easiest signs is the 2 rubber tubes blow off the egr/exhaust (near the exhaust heat shield).
you could knock the inners out and run it like that. if everything else is ok, it should still past a MOT test.
hth
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Blocked Cat
« Reply #2 on: Jul 31st, 2007, 11:29pm » |
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Just in case you're hearing a rattle Alastair, did you ever get the cat bracket fixed or removed?
Remember one end of it was hanging loose?
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Alastair
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2.3 Ghia X & MGB Roadster
Posts: 129
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Re: Blocked Cat
« Reply #3 on: Aug 1st, 2007, 9:15am » |
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Thanks Guys
No Stuart it wasn't a rattle or anything I can put my finger on, just a feeling that the response from the engine was not what it should be.
The car, as you know, was serviced recently by "FMD" and the plugs are new.
I know from playing around with Scimitars for the past 20 yrs that one of the easiest ways of getting better response is to get rid of the exhaust gasses quickier.
One of the comments made durung "the troubles" was that the cat appeared to be blocked.
I just wonderd how to check bthis and what the effect would be of a choked cat on the running
Alastair
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pappa
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VM Diesel 2.5Tdi 90kW
Posts: 259
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Re: Blocked Cat
« Reply #4 on: Aug 1st, 2007, 3:28pm » |
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Hi there.
One symptom of a glogged cat is at least that it may suddenly loose power. You step on the
pedal and it's kind of choking and that's because the gases are not passed 
On a Cossie it's a wee bit more serious than that, it can cause the fuel lines to melt and
may even cause a fire. This quite often is rather terminal for the poor car  Some
cases have been reported (I was told by the local Ford).
On a 2.3 DOHC - I'm guessing - the fuel lines are on the opposite side, so even though
the glogged cat will overheat, it won't melt them.
That's about the worst case scenario. The happy rattling noice means that the bits
are happily bouncing around inside the cat and you may expect them to create a
block some day.
Take the thing out, hammer the cheramics out and put the now empty kitten back. That'll do the trick,
but is not very environmentally correct 
Or do this: http://www.issikka.net/make/images/engswp/exhaust-no-1.jpg
Good luck.
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My cars are the best and the pigs and cows fly.
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Blocked Cat
« Reply #5 on: Aug 1st, 2007, 7:52pm » |
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Maybe its just sugar in the petrol
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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Alastair
Full Member
2.3 Ghia X & MGB Roadster
Posts: 129
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Re: Blocked Cat
« Reply #6 on: Aug 1st, 2007, 8:48pm » |
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Thanks I never did take that sugar out (nor fix the bracket but thanks for the reminder)
Alastair
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Blocked Cat
« Reply #7 on: Aug 1st, 2007, 10:13pm » |
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From what i've heard from others there would be a loss of power, possibly a knock or rattle and it would run rough.
All dependant on the severity of the blockage though I assume.
Does it not feel as responsive as before Alastair or are you missing the power of the Honda?  (Sold it today by the way)
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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