Burning oil smell on decel
#1
Senior Member
Thread Starter
iTrader: (2)
Join Date: Jun 2006
Location: Wisconsin
Posts: 1,269
Total Cats: 7
Burning oil smell on decel
This has been happening for quite some time, my car smells like burning oil when engine braking. It doesn't smoke as far as I can tell, but last year it almost always smoked when the engine was cold after startup. No noticeable power loss or other symptoms. I'm thinking it's something to do with the valves, but who has any other insight before I take the head off?
Thanks
Thanks
#3
Senior Member
Thread Starter
iTrader: (2)
Join Date: Jun 2006
Location: Wisconsin
Posts: 1,269
Total Cats: 7
I'm using the standard Miata PCV valve, it works only when I blow in from one side, so that's fine. I just have a breather filter on the other valve cover port though, could that be where my problem is?
#6
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,494
Total Cats: 4,080
yeah, on the intake...it could be that the pcv valve is possibly not sealing under higher pressure (you cant blow 9psi) if that is the case then the pressure entering the crankcase might make it hard for the oil to drain out of the turbo and it burns up a tiny bit.
#8
Valve seals? If you are not running the MAF, then the filter on the driver side of the valve cover isn't a big issue, if you have the MAF then you should reconnect it to the intake tube before the turbo.
On decel, there should be high vacuum sucking the PCV open into the intake, so I'm not sure if a stronger PCV will solve the issue. The GTX PCV is a good idea, anyway.
On decel, there should be high vacuum sucking the PCV open into the intake, so I'm not sure if a stronger PCV will solve the issue. The GTX PCV is a good idea, anyway.
#9
FYI the number on the autozone replacement PCV valve is 2196. This is the number printed on the PCV valve itself. For turbo Miatas use part number 2190. They look the same but the 2190 will function as a check valve when pressure is on the manifold side. The 2196 will not fully seal under pressure. Looking at values in my EMS I show no change in manifold vacuum at idle. I can pull one of the smaller vac lines and see it in map reading.