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Mot Fail On Co2


Best Answer Nu2mini , 16 August 2017 - 01:25 PM

When you've changed the Pipes I'd also recommend you check the vacuum servo on the air box. To do this take the car for a run until warm, then leave the engine running. Carefully insert a long screw driver or similar into the intake in the air box. When warm the 'Probe' should freely pass into the air box. Insert the probe gently. If you hit something halfway along the intake the butterfly flap is not opening and you are drawing warm air in from the exhaust manifold (5 on the diagram). A common fix to this is to unplug the vacuum pipe (Yellow) off the top of the airbox and plug the end of the pipe. You can leave the airbox end open. With this configuration the servo should not operate the butterfly which should stay permanently open. I run my car permanently like this

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#1 MCMC

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Posted 26 July 2017 - 01:13 PM

Hi all. My Rover Cooper SPI Monte Carlo has failed its MOT ( and retest) on exaust CO2. The rest of the care is in very good shape mechanically The car has been off the road for 2 years but runs well and drove very well to the testing station ( it has a stage 3 head ! )
Plugs, filters all good and added Redex to the fuel, garage says take on long run - but as it has no MOT so not a good plan to drive around - Catch 22 - any ideas. Can the SPI unit be adjusted / tested etc?
Any ideas - that don't involve taking to a Mini specialist, there's not any around here ? ( Aylesbury )
Thanks. Jon.

#2 Carlos W

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Posted 26 July 2017 - 01:32 PM

Has it failed on CO or CO2?



#3 DomCr250

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Posted 26 July 2017 - 01:51 PM

If it's got a CAT still in then stick some Cataclean in the tank (less than half full of petrol), book it for an MOT and then take a 30 mile hard driven detour to the MOT station ... it's perfectly legal as long as you have a MOT booked in advance.



#4 MCMC

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Posted 26 July 2017 - 03:08 PM

Fail was 001 -Exhaust emissions carbon monoxide content after 2nd fast idle excessive
Thanks for any help.
Ps there's a small thin red pipe that comes out of the air cleaner and is not plugged into anything- bit like a old type vacuum advance pipe does this matter ? as I say the car runs very well.
Ta. Jon.

#5 MCMC

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Posted 27 July 2017 - 12:40 PM

Sorry - to be clear MOT fail on carbon monoxide CO. Not CO2. My error.
It's been suggested to check the battery earth ?! Thanks for any help. Jon.

#6 minisilverbullet

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Posted 27 July 2017 - 12:46 PM

Fail was 001 -Exhaust emissions carbon monoxide content after 2nd fast idle excessive
Thanks for any help.
Ps there's a small thin red pipe that comes out of the air cleaner and is not plugged into anything- bit like a old type vacuum advance pipe does this matter ? as I say the car runs very well.
Ta. Jon.

 

Does it have the original airbox or an after market filter? 

 

First thing I would do is to remove and check all vacuum lines. They should be no cracks or splits. 



#7 FlyingScot

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Posted 27 July 2017 - 03:05 PM

The small red air pipe you describe should be connected.Rather than checking then I always recommend that unless you have replaced them replace all the vacuum pipes and fuel trap complete (they are service items). That way you eliminate the commonest cause of fuelling issues on SPi


http://minispares.co.../PHP10043.aspx?

FS

Edited by FlyingScot, 27 July 2017 - 03:08 PM.


#8 MCMC

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Posted 27 July 2017 - 03:10 PM

Craig hi. It has a standard air cleaner housing with a ( clean ) K&N aftermarket long life filter. As I mentioned there's a small red tube that is attached underneath the air cleaner housing that is not plugged onto anything on the other end - any ideas?

+Sorry - ' vacuum lines ' where are they and how many ? SPI units are a mystery to me.!
It's been suggested to check the battery negative earth cable and connections ?? As it might be upsetting the sensors?

Anyway thanks. Regards. Jon.

#9 FlyingScot

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Posted 27 July 2017 - 03:40 PM

Craig hi. It has a standard air cleaner housing with a ( clean ) K&N aftermarket long life filter. As I mentioned there's a small red tube that is attached underneath the air cleaner housing that is not plugged onto anything on the other end - any ideas?
+Sorry - ' vacuum lines ' where are they and how many ? SPI units are a mystery to me.!
It's been suggested to check the battery negative earth cable and connections ?? As it might be upsetting the sensors?
Anyway thanks. Regards. Jon.

Click the link I posted and you will see the red pipe and it also lists the other pipes and fuel trap.
FS

#10 MCMC

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Posted 27 July 2017 - 03:57 PM

Thanks. will investigate. Jon.

#11 MCMC

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Posted 08 August 2017 - 01:56 PM

Hi. I am trying replacing the red vacuum pipe that fits underneath the air box to throttle body as suggested. ( thanks )
-PHP 10043 from Mini Spares

I've attached one end to the air cleaner but can't see where it fits ' on the throttle body ' at the other end. It was not attached when I bought the car!

Any clue would be a great help. Thanks. Jon

#12 FlyingScot

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Posted 08 August 2017 - 02:09 PM

Moved to injection section.

The red vacuum pipe plugs on a spigot on the rear of the cast inlet manifold. One goes to the fuel trap the other is this red pipe.

FS

#13 MCMC

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Posted 08 August 2017 - 02:22 PM

Great - found it Could this little pipe not being connected cause a mot fail on carbon monoxide emissions ? - All the other vacuum pipes seen good.

Thanks.

#14 FlyingScot

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Posted 08 August 2017 - 05:12 PM

What I always post in response to questions about the vacuum pipes is this

"Replace all the vacuum pipes and fuel trap unit with new - they are service items and supposed to be replaced"

They are the single biggest components leading to issues with poor running and by replacing them you can eliminate a bunch of problems.

SPi system is designed to keep the car going at all costs and it will substitute dummy values into the ECU if sensors read out of spec, when new remember your local Rover agent plugged it into the Testbook or T4 system and read the faults and component values to check all was okay. It's is worth trying to find someone local who can lend you a code reader (and knows how to use it) - there is a pinned thread on this.

FS

Edited by FlyingScot, 08 August 2017 - 05:12 PM.


#15 tmsmini

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Posted 09 August 2017 - 12:59 AM

from the linked page:

There are 4 vacuum pipes on the single point injection car. 

MLH10022 Which has angled ends,fitted from inlet manifold to fuel trap. 

MLH10022ECU to fuel trap. 
PHP10027Air box underside to airbox hot air control valve. 
NPC10001fuel trap.

 

PHP10043 VACUUM PIPE- FITS TO SPI AIR BOX to THROTTLE BODY (RED)

 

For single point injection cars only.

 

And another diagram

spi.jpg


Edited by tmsmini, 09 August 2017 - 01:03 AM.





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