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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6346
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
2009 Mini - failed MOT
One for those that know their oils. Mr. Green

took my daughter Mini for an MOT and the short story is it failed on Emmissions (didn't fail first time round on emmissions).
Lamda - fail. I'm lead to believe this could have been a result of the exhaust leaking at joint after I removed / refitted.

Anyhow after having another go at jointing the exhaust along with exhuast paste. I've also put aload of Catoclean in the fuel and replaced the spark plugs. While at it I noticed the was little / no oil in the engine so chucked a few litres of some basic oil in until I do a proper oil change with filter etc.

anyhow now the the hydro carbons have gone from 10 to 210 - 200 being the limit. so now a fail on the hydrocarbons. Crying or Very sad

any thoughts - I'm wondering if the Catoclean was doing its stuff and cleaning all the hyrdrocarbons out the exhaust at the time of testing?
are there any oils out there I should be using that would minimise the hydrocarbon result as the tester suggested the piston rings have gone and hence the problem? Confused
Post #1069922 17th Jun 2025 8:16pm
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 983
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
Have you taken the car for a good run to get it right up to temp? 2008 2.4 110 Utility Station Wagon XS.
Post #1069927 17th Jun 2025 8:57pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6346
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
I did do a 20 min fairly quick drive before hand but then it was sat for 20mins before it went for the test Sad
Post #1069931 17th Jun 2025 9:24pm
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 599
England 
Try a new air filter. More air = better burn = less unburned hydrocarbons. Plugs torqued properly. Spark sits in the injector paths if it the right way round and can be shrouded by the electrode if 180 out. Small things to try but might get it below 200
Post #1070007 19th Jun 2025 6:55am
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3179
United Kingdom 
lt's common for the valve guides to fail on these older Minis.

The engine then burns oil, which is why there was none left in the sump. lt may be that refilling it with oil has increased emissions as it gets into the cylinders.
Post #1070068 20th Jun 2025 5:17pm
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