MOT CO2 Emissions

[Cadami]

Thanks Rob, I removed the valve last year as recommended by you. I'll get the laptop out and recalibrate the TPS just in case.
However, I've always thought this engine was a tad lumpy, which maybe a cam / timing issue. What's the simplest method of checking the cams apart from removing the cam covers and checking the cam timing marks?

[Sando]

It's either cam covers off, or if you marked the wheels up, or know the markings,check cam belt cover side if you can get in to see them behind covers/splash guards. At TDC I have cam wheels marked up so a straight edge lines up markings across each pair . But there were already marks on the wheels. It's only a guide to see if the belt has jumped. The cam locking tools are the proper accurate way to check, but probably way over the top for a weak mixture at tickover.
To be honest I'd reset the the TPS and tickover and just forget it and be glad it gets through MOT with ease.
its probably more to do with mapping at tickover than anything else, as without the ICV it's just butterfly position an map squirt and spark timing that does everything.

[Bernard]

Apologies if you already know this but the cams and drive belt wheels only location is the friction of the taper...there is NO key on the taper.....therefore if the bolt is not sufficiently tight the they could slip against each other...... If that makes sense.....