Quote:
Originally Posted by 97 SL320
Nox is caused by high combustion chamber temperatures, in this environment Nitrogen is fused with Oxygen.
Is your EGR system working? When exhaust is recirculated into the intake combustion chamber temps drop.
There may be timing / fuel mixture causing high temps, have a look around the net for a emissions curve that shows fuel mix vs CO , CO2 , HC and Nox to get some idea what is going on.
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Does a hot EGr tube & valve mean anything?
This is on the engine?
its a euro engine so its different in some ways
The idle control valve is a air slide not electronic ignition as it was changed sometime in the life on the car.
This idle control valve was used on the 450 SL engines...wonder if this is adding to it??? I changed some rubber hoses in that area. Don't know how to get out the hose from the aux air slide valve to intake. May have to remove vlve so will leave that to a tech
Found a cracked hose connected to a valve on back of intake manifold. that is also big tubing I don't have so will have to adress it...
This wouldn't make it run great.
Hoses are hard. Will have to get around to have someone change the hose over the 4 valve ports.
Trying & it does seem to be running smoother
