A place for general chat about the Jimny. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.

Suppliers/Dealers or anyone selling with a commercial view in mind CANNOT post here unless responding to a specific request of a member in a "wanted" post.

Suppliers include people "breaking for spares" on a regular basis, when purchasing spares members should ask a supplier what they contribute to the running of the forum particularly if contacted by a Private Message

Suppliers or Members who have contributed to the forum can be identifed by the
logo.

MOT Emissions Issues - very strange

More
16 Jul 2024 22:14 #256805 by rhino666
Well the good news is she breezed the retest
Fast Idle test...........
CO - 0.01
HC - 12 ppm
Lambda 1.007
Natural Idle Co - 0.27

Natural Idle CO aside, as marginal, the other figures pretty much perfect.
What a huge relief.

Please Log in or Create an account to join the conversation.

More
17 Jul 2024 07:38 #256808 by facade
Well done!

The high idle CO is probably low catalyst efficiency when it cools down a bit at idle, I wouldn't worry about it until it fails an MOT again.

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)
The following user(s) said Thank You: rhino666

Please Log in or Create an account to join the conversation.

More
21 Jul 2024 20:13 #256888 by rhino666
Can't think of anything else, other than cat that would cause the high CO here but surprised there is none on fast idle.
I watched him do the test and he did not mess around, thrashed the hell out of it on fast idle and then dropped to natural idle very quickly.
The cat is aftermarket and as it's a 1998, unlikely to be type approved.
I find the extremely high HC allowable, hugely out of proportion to the low CO for an MOT pass.
A company I deal with that sell aftermarket cats, BM Catalysts, are very conservative and generous with their warranty returns but will not accept a return where the HC level is 60+ppm. Kind of puts the absurdly high MOT pass level of 200ppm into lala land.

Please Log in or Create an account to join the conversation.

Time to create page: 0.307 seconds
Joomla template by a4joomla