MAF keeps fouling?

[SVTContique]

Anyone know what might be causing my MAF to foul?

I was having issues with my car driving and figured out it was my MAF, couple sprays of contact cleaner and it was fine.

Now it seems to be starting up again, under boost its breaking up, AFR jumps up instantly and then back down...

What could be causing it, at first i thought it was oil from my intake, but there is no way it could go through the supercharger, through my intercooler, and then back into the maf...

Could i be leaking oil in the tube somehow? My BOV is mounted kind of low as well.

 

[workmangc]

Over oiled air filter?

 

[SVTContique]

Yea but all the way through my supercharger, the piping, the intercooler and to the MAF? i would have had to mega over-oil it.

 

[racecougar]

What PCV arrangement are you running? That may be a source of oil in the intake tract. I assume we're dealing with a centri setup here? A pic would be nice.

 

[Tabres]

I have no knowledge of how Prochargers seal, but could the blower itself be leaking oil and need a rebuild?

 

[MLS]

You are probably pulling oil through the pcv system. My setup did the same thing until I added a catch can.

 

[encasedmetal]

Pcv should always be after the maf so hopefully thats not the issue

 

[MLS]

After the maf on blowthrough? Then you would pressuize the crankcase.

 

[SVTContique]

PVC is after the MAF iirc, no catch can, i cant remember what the tube going to my intake tube is from now, ive had oil on my BOV before (which comes after the blower).

Either way i need to figure this out, its making the car undriveable, i can put around but if i go WOT it just goes all over the place and pisses me off.

 

[MLS]

put up some pics so we can see whats going on.

 

[itSSlow98]

Yes you can get oil all the way to the maf. I had serious problems with my turbo setup pulling oil right through the pcv. I actually had to pull all the intercooler piping to clean it all out. Now I have an oil seperator on the drivers side and a catch can on the passenger.

 

[MLS]

Mine has both sides t-ed to a catch can and from there it goes to the intake tube.

 

[encasedmetal]

After the maf on blowthrough? Then you would pressuize the crankcase.

are you serious? :dw: why would put air back through the maf that already been metered? pcv, when rerouted to the intake tract should 100% always be after the maf whether stock, draw through, blow through, whatever.

 

[MLS]

You're really making me wonder lol. Its the way my tuner set it up. The spot on the intake that would normally have a pcv valve runs vac to my bov, while my drivers side valvecover pcv valve has a long hose that t's to the passenger pcv and then to catch can and then to the power pipe. My maf is blow through so it is right before the throttlebody.

 

[itSSlow98]

Mine goes before the Maf on the passenger side and I'm blow through i don't see how it hurts that air coming out of the valve covers isn't going into the combustion chamber anyways.

 

[DVJ38]

Either your maf is worn out and the hot wire is unable to get hot enough to burn off the oil, or you are getting way too much oil mixed in with the air.

Don't forget a maf can just be old and worn out, but usually there is a cause for the oil as well.

 

[mwolson]

Could be your PCV valve is not stopping the boost from getting back through the PCV system.

A lot of high boost 03/04 Cobra guys run an aircraft quality check valve in their PCV system just after the PCV valve: ANDAIR CHECK VALVE from Aircraft Spruce <---click!

Part # 05-00719 with no bleed.

 

[SVTContique]

Either your maf is worn out and the hot wire is unable to get hot enough to burn off the oil, or you are getting way too much oil mixed in with the air.

Don't forget a maf can just be old and worn out, but usually there is a cause for the oil as well.

Could that explain why my car is awful to drive in the rain (like im talking impossible, any bit of load and it dies)