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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EGR was checked by a mechanic & by myself & it opens.
I did find a cracked red ruv=bber hose connecting it to the egr vac line.
I replaced that.
I have some old rubber hoses leading to intake I will be switching for new ones.
The engine does run hot 90C.
I have to call around to see what smog repair shops will be able to diagnosis a 30 yo car.
I'm getting a temp gun.
What kind of operating temps of various componemts should I detect?
Can this help w detecting problems?
NOx seems to be a tricky one for the emissions to handle.
Thanks
