Oddity: Spraying fuel from turbo after FPR replacement.

[daspoop]

I replaced my FPR (since I was getting lean AFRs) with an IE adjustable one and set it to 43psi (~3-bar). My AFRs were still lean and now their is fuel bubbling out of the hot-side of my turbo. Not sure what could be issue...spark-plugs, injectors, etc. AFRs is reading 16:1 on idle and sometimes it doesn't read. Any thoughts will be greatly appreciated.

Specs:
Miller MAF/War turbo tuning
42lbs injectors,
t28 Garret
BOV
FMIC
3"DP
Adjustable FPR

[TheTacoMan]

I would verify your air fuel ratio gauge is still working and accurate, also buying an adjustable fpr seems pointless. Miller should be able to adjust fuel amount from the injectors.

[daspoop]

I've been trying to get in contact with Miller Performance, but have not gotten any response. I bought because it was $100 new from a friend lol; miller performance also recommended one. On a serious note, I have never seen this happen.

[jalopi]

Da fuq? Seriously? Where exactly out of the hotside is there gas 'bubbling' out from? I'm assuming you've run the car since you said your afr's are still kinda lean.. which is scary cuz the hotside definitely gets hot enough for fuel to autoignite

Pics please... I've gotta see this

[TheTacoMan]

Which leads me to believe your AFR gauge is wrong, Ive seen it happen before.
Honestly miller really sucks, it doesnt account for real time driving. What im saying is it sends the same amount of fuel in for 1st gear as it does for 2nd, 3rd etc.. With turbos and gears the load changes quite a bit from gear to gear thus needing different amounts of fuel. Atleast this is from what I saw in kamotors old setup a couple years back.

[TobyB]

Fuel when running, or fuel when sitting?

Sitting would suggest a leaky injector or 3.

t

[bmwstudent]

Which leads me to believe your AFR gauge is wrong, Ive seen it happen before.
Honestly miller really sucks, it doesnt account for real time driving. What im saying is it sends the same amount of fuel in for 1st gear as it does for 2nd, 3rd etc.. With turbos and gears the load changes quite a bit from gear to gear thus needing different amounts of fuel. Atleast this is from what I saw in kamotors old setup a couple years back.

How does MS or any engine management know what gear your in, doesn't it adjust fuel based on engine load, throttle position, rpm ,etc.

[ak-]

Fuel bubbling on the exhaust side of the turbo!? What!? Where exactly?

16:1 and not reading (which means it's just spiking lean) sounds like a vacuum somewhere.
The car should start up and idle normally; how's the idle?

[kamotors]

I've seen AFR's read full lean when they get wet with fuel, your VERY Rich and on a poor tune.

[MR 325]

Why do you need a adjustable FPR? Stock FPR and pump are fine with proper tune.

[jlevie]

How does MS or any engine management know what gear your in, doesn't it adjust fuel based on engine load, throttle position, rpm ,etc.

I don't know that an MS could do it, but if given the data for the transmission gear ratios a DME could work out what gear the car is in from engine and road speed. My IQ3 dash does this.

[codrum]

Sounds like maybe a leaky injector or too much fuel pressure is filling up a cylinder and you're pushing unburnt fuel into your exhaust. Chances are there is so much fuel it's not igniting and drowns the spark plug on its way out. That would explain fuel coming out of the hot side of your turbo and lean AFRs since the fuel never atomizes.

Pull all of your injectors and crank the car. If this is the case the piston will eject the unburnt fuel (and the same cylinder will have a soaked injector).

[AndrewBird]

Are you sure it's fuel? Could be a leaky head gasket and what you are seeing is coolant.

[daspoop]

.

Thanks for the feedback everyone. I will do some more diagnosing and provide a video.