Can't stand no more

TerryM · Sep 8, 2009

Hi all
I've got a 3.9 disco 1 and the cats have gone making a very unpleasant din. For various reasons the car won't pass another MOT and it's got body damage so when the current ticket expires in 6 months it'll probably be scrapped. In the meantime is there a cheap solution to the 'orrible racket.

It's been suggested that I could remove the cats and take out the insides. Or could I just replace them with a plain piece of pipe.

Any ideas will be appreciated

Thanks in advance

goonarmy · Sep 8, 2009

replace em with straight through pipe.

Beast o Bodmin · Sep 8, 2009

You will have no worries with sticking in a straight pipe.it also may pass emmissions.
Do you run LPG? if so straight through pipe no silencer will pass mot in my book.

classic kev · Sep 8, 2009

If you de-cat it you may need to change the tune select resistor in the efi loom. You'll need the resistor from a non-cat 3.9; this stops the ECU looking for the lamda sensors and it will then use the non-cat fuel map. The resistance value I believe can be found in Rave or Haynes manual.

discool · Sep 8, 2009

It's been mentioned in a few forums that drilling a holes and screwing a few wood screws into the cat stops the rattling, they say it works.

gavbriggs · Sep 9, 2009

discool said:
It's been mentioned in a few forums that drilling a holes and screwing a few wood screws into the cat stops the rattling, they say it works.

doesnt sound very water tight, i reckin tw@tting it with a hammer to jam the cats up is the best way!!

after all tw@tting with a hammer is the first thing and self respecting lany owner should do!!!

TerryM · Sep 10, 2009

Er um thanks for the suggestions chaps.

It's not lpg. I don't do much mileage, I use the disco for the seven seats and to tow our caravan.

I may try the ****ting method then the straight through pipe idea.

I will keep you in touch with the results

Cheers

Terry

Brian S · Sep 12, 2009

classic kev said:
If you de-cat it you may need to change the tune select resistor in the efi loom. You'll need the resistor from a non-cat 3.9; this stops the ECU looking for the lamda sensors and it will then use the non-cat fuel map. The resistance value I believe can be found in Rave or Haynes manual.

I have de-catted my EFI and have never heard of this.

What change would I see with this mod? At the moment the emisions are very high, would they go down?

Can't stand no more

TerryM

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goonarmy

Beer tester

Beast o Bodmin

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classic kev

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discool

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gavbriggs

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TerryM

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Brian S

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