Hc Emissions

[Danny06]

Ok peeps i need help big time, I took my car (bmw 325i sport) till get the air flow set and emission(hc & co) set 2day and my Hc is sittin at 2910ppm and needs till be 1200ppm or less for mot, we tryed every thing and cant seem till bring it down!..Has any1 had this problem before? Dont no if this has any effect but the car has a polished and gas flowed head along with a high lift cam!! Need thes emissions down big time for mot.... Any help please

[Ant]

high HC normally points to a timing issue, if the valve clearances are set incorrectly , this can casue issues too

what was the idle CO mix ? if it was lower than 1.3 by some margin I'd suggest upping to around that figure and seeing if the HC drops off accordingly.

I assume you've no silly FSE "power valve " wrongness fitted, nor oversized injetcors etc etc ?

[Danny06]

The co mix woz set at 2.010%vol we tryd dropin the co and uppin it but lowested we got the hc till woz bot 2400

There is none of them valves that im aware of and same with the injectors just wot i have said above

[Danny06]

bump

[Jon_Bmw]

Can't remember off the top of my head, but an exhaust leak pushes one of the values up, possible CO actually. Maybe worth a look anyway?

[Danny06]

the co is siting fine!!

[stuartgallafant]

could it be over-fuelling? maybe to do with the fuel pressure regulator?

or an airleak, after the air flow meter and before the engine (if you know what i mean?)

[BMW_YARD]

You bothered to check the tappets yet?

http://www.e30zone.co.uk/modules.php?na ... highlight=

[Danny06]

naw didnt cheek them as it woz till do with the air flow and have it running/idleing nicely now