Catalytic Converters

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alamn2
Posts: 22
Joined: Fri Jan 13, 2017 6:15 pm

Catalytic Converters

Postby alamn2 » Tue Jan 15, 2019 8:56 pm

Last MOT, the car wasn't passing on the right exhaust but on the left side it gave the correct readings ,, the tech did say the right side seems hotter and may be blocked at the point of the CAT.

A week on and iv not done any heavy driving the right side cat is now blowing or an area around there the rattle is louder on cold and I can see smoke puffing out from cold but as it warms up it quiets down, iv only driven abut 20 miles since the MOT.


Questions:

Is it possible to Decat an Xk8? or is it betetr to replace the cats.. now to replace the cats anyone with experience on complexity and effort? old bolts are pulvarised so will it be a cut and weld.

Is it ok to just replce the 1 cat is should i be doing both

alamn2
Posts: 22
Joined: Fri Jan 13, 2017 6:15 pm

Re: Catalytic Converters

Postby alamn2 » Tue Jan 15, 2019 9:01 pm

https://www.icloud.com/attachment/?u=ht ... z=74592238

the quick video can be found above , its the cat on the far side thats blowing

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A.J.P.
Posts: 317
Joined: Wed Mar 15, 2017 9:51 am
Location: Plymouth,Devon,U.K. J.E.C.Member

Re: Catalytic Converters

Postby A.J.P. » Wed Jan 16, 2019 12:17 pm

Hello alamn2,
As far as I know you have to have the cats with all the cells inside to do their thing to the engines exhaust gases as they pass through the catalytic converter,you have an oxygen sensor on the inlet that reads the gases coming in from the engine and another that reads the gases after they have gone through the cells of the cat where there is another oxygen sensor that reads what the change was.This is what directs the ECM to add or subtract fuel to the mixture that is being fed to the engine so that it will run at it's optimum efficiency.
If your looking to replace the cats I would do both but not really necessary as long as you replace with the same type.
Here's a link for some cats:
https://www.xk8-parts.com/2013/06/great ... onvertors/

A couple of years ago I had the drivers side cat blowing like yours due to a hole caused by corrosion,I used the exhaust wrap that the custom guys use for a temporary fix with the intention of replacing the cats later on.
The wrap is still on after two years,the wrap comes with stainless steel cable ties but I used some wire that I had lying around to secure the wrap.Might be worth a try.
I wrapped both cats just to even things out so it didn't look out of place(I like things equal :roll: ).
Here's a link for the exhaust wrap:
https://www.ebay.co.uk/sch/i.html?_from ... p&_sacat=0
Hope that helps a bit.
Take Care.
Andy :D
Enjoy The Luxury Which Is The X308
Jaguar XJ8 4.0 Sovereign LWB
Colour:Emerald Green (HGG code)
Year 2000
120000 Miles and Rising :D
J.E.C. Member

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nrandlexj40
Posts: 15
Joined: Fri Aug 12, 2011 5:11 pm

Re: Catalytic Converters

Postby nrandlexj40 » Tue Aug 13, 2019 1:25 pm

On a similar note - I'm going to be replacing both Cats on my 1996 Coupe as they are blowing very badly.

I notice that 2 options are available - homologated and 'non-homologated'
From what I understand - post 2001 cars have to use homologated cats and earlier models don't....

What are the pros / cons of the 2 options?
Neil
1996 XK8 Coupe
2000 S-Type 3.0 V6 SE
2010 XF 3.0 V6

Previous: 1993 XJ40 Sovereign | 2004 X-Type 2.5 V6

mike020150
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Joined: Wed Feb 08, 2006 6:26 pm

Re: Catalytic Converters

Postby mike020150 » Tue Aug 13, 2019 5:41 pm

Homologation is about ensuring (in this case) that emission standards are adhered to. A non-homologated cat could be a universal version, not specifically designed for the XK8 and therefore, it may or may not produce exactly the same emissions as one designed specifically for the model. As emission standards tightened, from 2003 onwards it was deemed important to ensure that the emission standards achieved on the original tests would also be achieved when replacement cats were fitted. Mike.
2014 XK Dynamic R convertible; 1977 Daimler Double Six Coupe; XE S

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J44EAG
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Joined: Sat Oct 20, 2007 9:57 pm
Location: Warlingham Surrey/Faversham Kent

Re: Catalytic Converters

Postby J44EAG » Tue Aug 13, 2019 10:08 pm

I have non standard, fast flow, 200 cell sports cats on my MY04 XJR. It seemed a good idea at the time.

Yes, I can get an MOT test but have to rev the car hard for two minutes prior to the gas test. The sports cats help the car go like stink but stink is the operative word when the cats go cold on the MOT ramp. I watch the cats light up again on my Torque Pro app on my Android phone which links to the car via an ELM327 blue tooth chip. When the cats cool, the emissions go off the scale. Hotted up, that is a different matter.

OK, I live with the condition but it is not recommended. Stick with genuine Jaguar OE cats appropriate for the year of your car whenever possible.

Mike K
X350 Co-ordinator

2004 XJR

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nrandlexj40
Posts: 15
Joined: Fri Aug 12, 2011 5:11 pm

Re: Catalytic Converters

Postby nrandlexj40 » Wed Aug 14, 2019 1:52 pm

Thanks for the info. It would appear that homologated cats are the way to go....

I'll continue with the restoration and hopefully we'll be up to MOT stage in the next month or so !!
Neil
1996 XK8 Coupe
2000 S-Type 3.0 V6 SE
2010 XF 3.0 V6

Previous: 1993 XJ40 Sovereign | 2004 X-Type 2.5 V6


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