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Thread: Catalytic Converter question

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    Catalytic Converter question

    My dads car just failed it's MOT... failed on the exaust and Catalytic Converter.. I'm just wondering if a catalyic converter from a standard ford fiesta, or a ford fiesta mk3 catalytic converter would work with a ford fiesta SI?. My dad says it won't but I have a feeling it might as it's still a fiesta..

    spanks.

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    Treasure Hunter extraordinaire herulach's Avatar
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    It will certainly fit, whether it will pass emissions or not is a different matter (you just need to check the bores match) Prob best to head down the scrappers and see if you can pick one up cheap.

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    Found one on ebay for a tenner (used), but also found some new ones for about £50-60.

    Possible to find me any proof so I can show my dad so he doesn't waste an extra £100+ on one?

    Also, what do you mean by checking if the 'bores' match?

    Thanks

    Edit:, actually I can't get one that cheap, it's a 1.6 Ford Fiesta SI..

    think this will fit? http://www.sportcats.co.uk/product_i...oducts_id=2256
    Last edited by XA04; 06-10-2005 at 06:41 PM.

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    Looser Konan555's Avatar
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    You say MK3, but what plate is it on?

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    Treasure Hunter extraordinaire herulach's Avatar
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    Bore is the diameter of the pipe.

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    Quote Originally Posted by herulach
    Bore is the diameter of the pipe.
    ah ok

    Quote Originally Posted by Konan555
    You say MK3, but what plate is it on?
    My dads car is a Ford Fiesta SI 1.6, with a M plate (not sure what year that is).

    The person on ebay selling one from a MK3 for a tenner.. http://cgi.ebay.co.uk/Catalytic-Conv...QQcmdZViewItem

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    Looser Konan555's Avatar
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    M. Might be a little late on then.

    I was just gonna say, loose the cat.

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    The stug Shad's Avatar
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    Quote Originally Posted by Konan555
    M. Might be a little late on then.

    I was just gonna say, loose the cat.
    All depends when the car was first manufactured/homologated. I think 1990 is the cut off era (someone shout if that's wrong!), anything designed before then doesn't need a cat.
    Simon


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    Quote Originally Posted by Shad
    All depends when the car was first manufactured/homologated. I think 1990 is the cut off era (someone shout if that's wrong!), anything designed before then doesn't need a cat.
    Reg. is in 1994 I think, not certain though.. but aparently that's what the MOT people say it failed on...

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    Looser Konan555's Avatar
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    Quote Originally Posted by Shad
    All depends when the car was first manufactured/homologated. I think 1990 is the cut off era (someone shout if that's wrong!), anything designed before then doesn't need a cat.
    *shouts*

    well ok, I'm not 100%

    I believe 1995 is the point by which all cars HAD to have a converter.

    I've seen some debate as to how cars with cats before that can be treated, if anyone's got the MOT handbook and can quote exactly what it says about cars made with cats before they where compulsory.

    Here's my take on it:

    Unfortunatly I'm not 100% on what Fraud where doing at that stage but I *think* they might possibly have all had cats by then (I'll go check with the sales gumph in a bit). It may be the case that your MOT tester is checking to see if it requires a test in the book. It MAY be they saw the cat on it and tested it (it has to work if it's fitted, no matter the date).

    What I'm going to say is this. If a tester didn't see the cat, what's to say it's a catted engine? There's a great deal of MK3 fiestas out there without. OK, there's a couple of clues, it's a CFi unit rather than a carb and a HEGO stuck in the downpipe. Depends on the garage.

    Unless the engine code's clearly visable. Mine was a sticker on the front of the timing chain cover apparently.... think that's survived since 92?

    Cats cost a lot. It could be a sensor problem causeing the EEC-IV to fuel wrong, but, more likely the cat's on the way out. They're expensive items. I suggest you have a friendly conversation with MOT stations as to where they'd stand on it uncatted.

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    Va Va Voom Lowe's Avatar
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    It was 1992 / J reg where the emissions tests changed.

    Saying that though, it's not illegal to run without a cat. There's no law that states you MUST have a cat. You'll probably fail an emmissions test without one unless your engine is running spot on, but it's not a legal requirement.

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    Looser Konan555's Avatar
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    Quote Originally Posted by Lowe
    It was 1992 / J reg where the emissions tests changed.

    Saying that though, it's not illegal to run without a cat. There's no law that states you MUST have a cat. You'll probably fail an emmissions test without one unless your engine is running spot on, but it's not a legal requirement.
    Erm.

    My G plate gets tested under different emissions regulations to my K plate (cat/non cat).

    There where also 93 K and L plate cars sold without cats.

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    Va Va Voom Lowe's Avatar
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    I'd imagine it would - the G reg will be tested more leniently.

    K and L plate motors without cats? Such as? I can only imagine they were old cars registered a lot, lot later down the line to get away with that.

    9th November 2003

    The aim of the catalytic converter is to dramatically reduce the three most harmful exhaust emissions — carbon monoxide, hydrocarbons and nitrogen oxides — hence the term “three-way catalytic converter”. The device is required on unleaded petrol-engine passenger cars first used on and after 1 August 1992.

    It’s called a converter because the emissions that go into the catalyst are converted to more benign substances such as carbon dioxide, nitrogen and water vapour. The device is fitted in the exhaust system just under the driver or passenger footwell and looks like a conventional silencer box, albeit flatter and squarer.

    The converter has two sections: a reduction catalyst and an oxidisation catalyst. Each is made of a ceramic honeycomb with a metal coating. The honeycombs create the maximum surface area for exhaust gas to pass over.

    Inside the reduction catalyst, the honeycomb is coated with platinum and rhodium, which are used to reduce nitrogen oxides in emissions. As the gas passes over the platinum and rhodium, a chemical reaction takes place that splits the nitrogen atoms from the oxygen. Both are harmless in their separate forms.

    In the second stage, hydrocarbons (from fuel) that have passed unburnt through the engine, together with carbon monoxide, are oxidised (burnt, basically) on a catalyst coated with platinum and palladium.

    It is because so many rare and precious metals are used that a replacement converter costs so much (between £100 and £500) but without it, your car will not pass the MoT test. Eventually, a converter will wear out (three to four years would be typical), though it can be physically damaged by knocking it on a kerb, or by an engine backfire. Mistaken use of leaded petrol will also ruin a converter.


    http://www.timesonline.co.uk/

    The Sunday Times, 9 November 2003
    Last edited by Lowe; 07-10-2005 at 10:20 AM.

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    Quote Originally Posted by Konan555
    Erm.

    My G plate gets tested under different emissions regulations to my K plate (cat/non cat).

    There where also 93 K and L plate cars sold without cats.
    Thats interesting... There are still a few S13's on an M plate ( late reg I suspect )


    but they dont have to have a cat fitted ( somethign to do with the model report I think )

    My old 820 Vitesse had been decatted , but either I had a sympathectic tester or the emmisisons where happy
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    Looser Konan555's Avatar
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    Ford where still selling cars with the cat as an option in 92/93. It may be that my literature is pre 1st august.

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    Mk2 CRX VTEC cars all came with CATs, as did the EDM models with the D16A8 non-VTEC engine. However they will all pass the MOT without a cat due to when they were made

    If your car has a CAT and you take it out, make sure you know how it will affect the engine management. If there's an O2 sensor after the CAT in the exhaust, it will probably switch into 'limp home mode' unless you fake the sensor reading or remap the ECU.
    Simon


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