Wynns injector cleaner with some decent fuel would be a reasonable alternative if you're concerned about removing the fuel rail
That is OK if you can drive the car and get through the cleaner & fuel mix in the tank ,then put fresh fuel in
BUT ...
if the car has failed MOT ,it can't be driven legally (except to/from MOT ,private land)
I like to use injector cleaner a month before MOT ,then Cataclean the week before then fresh fuel
!/4 tank for each treatment till the light comes on
Bad valve seals are much more likely to raise the HC readings, not the CO
Indeed ,that is my experience
high hydrocarbons on a petrol engine tends to be valve stem seals,worn rings etc
even an oil change can bring the HCs right down
High CO i've found tends to be petrol related
Thanks for the info dave the builder. I have a injector tester, that will do the pulse for cleaning them, bought it at the time, because the price was good. Justified buying it to myself, as a you never know .
you don't need to justify your purchase to me
I have loads of toys . TOOLS i mean TOOLS !
...... I really don't want to disturb the head, unless I have to.
agreed , even if the valve stem oil seals had failed so soon , or popped off , once the engine was warmed up ,the oil would have burned off in my experience ,and as said oil burning increases HC ,not CO
If I remember, once the intake manifold is removed. I should be able to see the tops of the valves. My thinking is that if I remove the intake manifold, then I do a clean on the Throttle body, even though it looks ok. And also see the injectors.
I can't guarantee cleaning the injectors will solve the issue sorry , it's just advice i'm giving based on my experience
but ... clean injectors will give a better hotter burn
couple of other thoughts ....
I use the same code reader a lot , but i've not worked on petrol 2 ltr engines since the vectra Bs and my Carltons
are there no LTFT and STFT readings in live data of ECU (measuring blocks tab) ?
obviously that would be advantageous ,but I can't remember if it's even an option
Also ,you say about the EGR , blanking it noticeably would be an MOT fail .
however
before that legislation came in recently
I've blanked many EGRs