pre cat disintergrated
pre cat disintergrated
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Discussion

69mrt

Original Poster:

2 posts

275 months

Monday 14th June 2004
quotequote all
I have just removed both manifolds on my 4.0 95 chim to fix leaky gaskets, when looking at the pre cats I found the drivers side to have disintergrated ( just the outer ring left )passenger side OK.
as usual what turned out to be a straightforward job has unearthed more problems, what are the best options.

1 bash out good cat (will this cause a problem with the MOT and will I need a rechip)

2 fit new catted manifold (very expensive)

3 where has all the bits of the old cat gone (blocked exhuast? how do I check/unblock)

what would you do

Mark

Apache

39,731 posts

313 months

Tuesday 15th June 2004
quotequote all
Aren't TVR's great! they tell you when they want modified. You need to call V8 Dev and price up a pre cat manifold you do. Yes it's expensive but you might die tomorrow

full_chat

287 posts

305 months

Tuesday 15th June 2004
quotequote all
Just had the pre-cats removed on mine and proceeded to pass the MOT with flying colours hours later so take them out. In fact I would advise it as if they are disintegrating you don't want any exhaust backpressure to take bits back into the engine (on that basis be incredibly thorough to make sure all traces of them are removed). To keep a certain amount of backpressure there are available 'cones' to weld in internally. From what I understand their job is to control emissions whilst the engine is warming up, when the engine is warm the main cat comes into play.

Tower View Race Services completed all the work on my car so don't take my advice as gospel! Might be a worth phone to a specialist just to confirm things.