Rover Metro 100 failed emissions.

[BlueBottle]

Hi all,

I am posting this on behalf of a friend whos having a bad time with
garages and her Metro.

MOT garage reports emissions failed;
Fast idle CO @1.44%, should be 0.3% max allowed.
Natural idle test passed. 0.13%, 0.75% max allowed.

She was then told by this garage that they could not fix the fault
because they did not have the correct equipment.
Off she then went to a local Rover gargage were a 'Microcheck' was run
on her engine.
This says, "Inlet air circuit default - Fail".
The guy behind the counter says, "Catalytic converter needs changing."

Now, this seems to me to stink !! :)

Can anyone shed any light on this "Inlet air circuit" ????
If air flow to the engine was being reduced ofcourse there would be more
CO in the exhaust. Isn't this why garages do not perform emissions
testing with cold engines?

Sorry for the long mail.
Cheers all,
Bob.

[unknown]

sorry but I am no mechanic - BUT cannot understand why a circuit fails why a
CAT should be changed (surely the circuit needs to be changed also or is
that 2 simple)

I have been advised that to get an "iffy" car to pass the MOT is an
"Italian" service - by this I mean a long/hard trip (20 miles at least) and
in high revs/lowe gear (once the engine is warm) - also get the best
petrol - shell/ BP not supermarket/Tesco

http://www.honestjohn.co.uk/faq/faq.htm?id=46

Post by BlueBottle
Hi all,
I am posting this on behalf of a friend whos having a bad time with
garages and her Metro.
MOT garage reports emissions failed;
Natural idle test passed. 0.13%, 0.75% max allowed.
She was then told by this garage that they could not fix the fault
because they did not have the correct equipment.
Off she then went to a local Rover gargage were a 'Microcheck' was run
on her engine.
This says, "Inlet air circuit default - Fail".
The guy behind the counter says, "Catalytic converter needs changing."
Now, this seems to me to stink !! :)
Can anyone shed any light on this "Inlet air circuit" ????
If air flow to the engine was being reduced ofcourse there would be more
CO in the exhaust. Isn't this why garages do not perform emissions
testing with cold engines?
Sorry for the long mail.
Cheers all,
Bob.

[BlueBottle]

Exactly what I thought.
Also, a lack of air (IE during cold engine startup) would also produce
the same high CO content. CAT's are for NOX.

I will find out what my friend ultimatly had done to her car and get
back to you on this.

Best regards,
Bob.