Exhaust diameters???

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bennyboy
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Post Thu Oct 12, 2006 6:37 pm

Havibg failed its emission test it looks like i need a cat for my car. i have put an M42 lump in with no cat or lambda. the old M40 lump had both. i still have the M40 exhaust system with cat. But will the centre section with cat in it fit into the M42 system?
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bennyboy
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Post Fri Oct 13, 2006 6:25 pm

Anybody?
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E30Mark
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Post Fri Oct 13, 2006 6:39 pm

can't you take it somewhere alse for a MOT...

A M40 Cat will not fit a M42 exhaust.... :?
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bennyboy
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Post Sat Oct 14, 2006 11:24 am

Thinkin of joining it in somehow now.
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Globulator
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Post Sat Oct 14, 2006 2:48 pm

What did it fail on? HC? CO? Not having a cat?
What age do you need stricter tests for - 1993?
1986 325i 'vert, funk louder than standard.
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bennyboy
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Post Sun Oct 15, 2006 6:50 pm

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jmc330i
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Post Sun Oct 15, 2006 7:00 pm

If your car is a J plate it wont need a Cat for the MOT - Aug '92 (K plate) is the date for that.
James
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DaveD
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Post Sun Oct 15, 2006 8:03 pm

this is the site that give you exactly what they need

http://www.motuk.co.uk/manual_730.htm
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bennyboy
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Post Sun Oct 15, 2006 9:25 pm

The plate must have been changed at some point because the date of manufacture is 30th dec' 1992.

Anyway, i jacked the car up tonight and saw this. definatly a cat?
Sorry about pic. its me phone. mum taken camara on holiday with her!
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DaveD
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Post Sun Oct 15, 2006 10:28 pm

the emissions depend on the date of manufacture of the engine ...if the engine(not the car ) was produced before aug 1992 the earlier standards apply ...why not put the vin into realoem and it will tell you the date of manufacture but it looks like a cat to me
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Simon13
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Post Sun Oct 15, 2006 10:31 pm

no thats a standard 318is centre box, back when i had mine i had it cut out and pipe welded in! didn't make it alot louder either really
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DaveD
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Post Sun Oct 15, 2006 10:39 pm

just a thought though if the car was manufactured after 8/92 it would have to had come with a cat and if you have not connected a lambda probe up it would not work cos......

any way try your vin in this this

http://www.bmw-z1.com/VIN/VINdecode-e.cgi
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Brianmoooore
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Post Sun Oct 15, 2006 11:21 pm

If it has a cat it will have a lambda sensor, which plugs into a socket clipped under the battery tray. Check whether there's a plug in the socket.
P.S. That looks like an ordinary front box to me as well.
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E30Mark
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Post Mon Oct 16, 2006 7:40 am

Brian, your link from another thread must count here too!

http://www.vosa.gov.uk/vosacorp/reposit ... 2-2002.pdf

If the vehicle is not an exact match to the emissions database (which it will not be considering they never officially built a M42 engined cab) then they should carry out a NON CAT test CO <=0.3.5% HC <=1200ppm
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bennyboy
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Post Fri Oct 20, 2006 7:20 pm

Thanx for the help guys! Went to different garage in the end with a spec sheet from the dealers of the 318is that the engine came from. they are happy to do the test so gonna get it down there tuesday for another go. bet it fails on another list of problems though! Never mind. another step forward! Thanks again!!!
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