MOT emissions testing - CAT/no CAT

Anything and everything to do with mechanical issues with your Mk2

Moderators: IMOC Moderators, IMOC Committee Members

Marf
Posts: 6728
Joined: Tue Jan 17, 2006 4:56 pm
Location: West Sussex

Re: MOT emissions testing - CAT/no CAT

Post by Marf »

toxo wrote:Just had mine done again.

Rev3 turbo, fresh head rebuild. Always run on Tesco 99.

CO: 0.36%
HC: 64ppm


Decatted J?
User avatar
toxo
IMOC Committee
Posts: 11345
Joined: Tue May 30, 2006 5:41 pm
Location: The Toast Aisle
Contact:

Re: MOT emissions testing - CAT/no CAT

Post by toxo »

Marf wrote:
toxo wrote:Just had mine done again.

Rev3 turbo, fresh head rebuild. Always run on Tesco 99.

CO: 0.36%
HC: 64ppm


Decatted J?


Of course!
IMOC-UK - the only club to win 'Best Club Stand' at JAE more than once, and twice in a row!
Marf
Posts: 6728
Joined: Tue Jan 17, 2006 4:56 pm
Location: West Sussex

Re: MOT emissions testing - CAT/no CAT

Post by Marf »

Interesting Mr Bond :-k

I think I'll book mine in for a pre-emptive emissions test and see what's what.
User avatar
toxo
IMOC Committee
Posts: 11345
Joined: Tue May 30, 2006 5:41 pm
Location: The Toast Aisle
Contact:

Re: MOT emissions testing - CAT/no CAT

Post by toxo »

I bet you can't get it lower than that :lol:
IMOC-UK - the only club to win 'Best Club Stand' at JAE more than once, and twice in a row!
Marf
Posts: 6728
Joined: Tue Jan 17, 2006 4:56 pm
Location: West Sussex

Re: MOT emissions testing - CAT/no CAT

Post by Marf »

Watch this space :P
SonicSW20
Posts: 3681
Joined: Mon Nov 29, 2010 7:54 pm

Re: MOT emissions testing - CAT/no CAT

Post by SonicSW20 »

My NA failed emissions with a decat.
raptor95GTS
Posts: 6213
Joined: Tue Dec 14, 2004 7:14 pm
Location: glasgow
Contact:

Re: MOT emissions testing - CAT/no CAT

Post by raptor95GTS »

Gazza_DJ wrote:My NA failed emissions with a decat.

a 97 is the lower of the emissions levels so harder to pass without a CAT
SonicSW20
Posts: 3681
Joined: Mon Nov 29, 2010 7:54 pm

Re: MOT emissions testing - CAT/no CAT

Post by SonicSW20 »

Indeed - Lambda and idle readings were fine, it was just the fast engine speed readings it failed on.
User avatar
toxo
IMOC Committee
Posts: 11345
Joined: Tue May 30, 2006 5:41 pm
Location: The Toast Aisle
Contact:

Re: MOT emissions testing - CAT/no CAT

Post by toxo »

Do you have the figures to hand?
IMOC-UK - the only club to win 'Best Club Stand' at JAE more than once, and twice in a row!
SonicSW20
Posts: 3681
Joined: Mon Nov 29, 2010 7:54 pm

Re: MOT emissions testing - CAT/no CAT

Post by SonicSW20 »

The certificate is still in the car, I'll post the figures later this evening after I've picked the missus up from the station.
SonicSW20
Posts: 3681
Joined: Mon Nov 29, 2010 7:54 pm

Re: MOT emissions testing - CAT/no CAT

Post by SonicSW20 »

1st Fast idle:

CO: 0.925
HC: 82
Lambda: 0.985

2nd Fast idle:

CO: 0.694
HC: 48
Lambda: 1.008

Idle:

CO: 0.439
dylan5084
Posts: 788
Joined: Tue Jun 28, 2011 10:53 am
Location: Oakley, dunfermline

Re: MOT emissions testing - CAT/no CAT

Post by dylan5084 »

nathan smith wrote:mot garages now use the 13th edition ehaust standards book. if vehicle being tested is not in the book,then tester must use default limits,these are basicaly not cat limits (pre 92)eg.mr2 turbos are not in this book


Just had mine mot'd and this is exactly the case :thumleft:
User avatar
Peter Gidden
IMOC Affiliated Trackday Organiser
Posts: 10506
Joined: Tue Jan 25, 2005 9:49 am
Location: South Yorkshire

Re: MOT emissions testing - CAT/no CAT

Post by Peter Gidden »

dylan5084 wrote:
nathan smith wrote:mot garages now use the 13th edition ehaust standards book. if vehicle being tested is not in the book,then tester must use default limits,these are basicaly not cat limits (pre 92)eg.mr2 turbos are not in this book


Just had mine mot'd and this is exactly the case :thumleft:


Correct. A MR2 Turbo with decat in normal, healthy condition will nearly always record a CO of 0.7-1%. Anything substantially more e.g. above 1.3%, and whilst it will pass the MOT, suggests a problem with the engine or management system.
dylan5084
Posts: 788
Joined: Tue Jun 28, 2011 10:53 am
Location: Oakley, dunfermline

Re: MOT emissions testing - CAT/no CAT

Post by dylan5084 »

Peter Gidden - SBITS wrote:
dylan5084 wrote:
nathan smith wrote:mot garages now use the 13th edition ehaust standards book. if vehicle being tested is not in the book,then tester must use default limits,these are basicaly not cat limits (pre 92)eg.mr2 turbos are not in this book


Just had mine mot'd and this is exactly the case :thumleft:


Correct. A MR2 Turbo with decat in normal, healthy condition will nearly always record a CO of 0.7-1%. Anything substantially more e.g. above 1.3%, and whilst it will pass the MOT, suggests a problem with the engine or management system.


Mine just passed with 2.6% what do I need to do now, I've just changed the lambda sensor, do I need another ecu?
User avatar
Peter Gidden
IMOC Affiliated Trackday Organiser
Posts: 10506
Joined: Tue Jan 25, 2005 9:49 am
Location: South Yorkshire

Re: MOT emissions testing - CAT/no CAT

Post by Peter Gidden »

dylan5084 wrote:do I need another ecu?


Highly unlikely.
dylan5084
Posts: 788
Joined: Tue Jun 28, 2011 10:53 am
Location: Oakley, dunfermline

Re: MOT emissions testing - CAT/no CAT

Post by dylan5084 »

Peter Gidden - SBITS wrote:
dylan5084 wrote:do I need another ecu?


Highly unlikely.


I've changed everything else
Davsurfa
Posts: 193
Joined: Sun Jun 23, 2013 6:47 pm
Location: Northants

Re: MOT emissions testing - CAT/no CAT

Post by Davsurfa »

My 94 n/a went in for mot, the tester said because it didn't come with a cat it didn't need one. I still bought one to weld on to original system, just in case I needed it, put it in for test with the japspeed. When I picked it up he just said "All passed, emissions weren't a problem" but I didn't get an emissions sheet with my test cert. Not entirely sure how that worked but I have an mot cert 8)
SonicSW20
Posts: 3681
Joined: Mon Nov 29, 2010 7:54 pm

Re: MOT emissions testing - CAT/no CAT

Post by SonicSW20 »

Image

My latest. Rev5 NA, stock cat.
User avatar
Peter Gidden
IMOC Affiliated Trackday Organiser
Posts: 10506
Joined: Tue Jan 25, 2005 9:49 am
Location: South Yorkshire

Re: MOT emissions testing - CAT/no CAT

Post by Peter Gidden »

Davsurfa wrote:My 94 n/a went in for mot, the tester said because it didn't come with a cat it didn't need one.


It will have had a cat fitted when new.
Davsurfa
Posts: 193
Joined: Sun Jun 23, 2013 6:47 pm
Location: Northants

Re: MOT emissions testing - CAT/no CAT

Post by Davsurfa »

I should of said mines a G-Limited import
Post Reply

Return to “Mechanical”