Stinky smoke while decelerating?
Stinky smoke while decelerating?
Since we installed the surge tank, I'm getting stinky smoke on decel after doing a WOT run. I also changed test pipes (to a used AMS test pipe). I also swapped the plugs. The old ones looked fine. I've not pulled the new plugs to look at it.
I'm not sure if it's just the added fuel pressure making it dump more fuel in or if there's something scarier going on.
The logs look fine, it's a little rich and it's pulling decently.
I emptied my catch cans last night, they had some stuff in them, but weren't full.
Here's a video (still processing, but will be in higher res once done)
http://www.youtube.com/watch?v=z1Qk3UtOs3Q
See 0:13 and 0:55 or so (the first is early in my drive this morning, the 2nd is near work).
I'm not sure if it's just the added fuel pressure making it dump more fuel in or if there's something scarier going on.
The logs look fine, it's a little rich and it's pulling decently.
I emptied my catch cans last night, they had some stuff in them, but weren't full.
Here's a video (still processing, but will be in higher res once done)
http://www.youtube.com/watch?v=z1Qk3UtOs3Q
See 0:13 and 0:55 or so (the first is early in my drive this morning, the 2nd is near work).
Does't look dark enough to be fuel or oil, but its tough to say from a video. An easy way to rule out excess fuel on decel would be to watch your IDC's to see if they drop to 0% while its still smoking. Are your wideband AFR's pegging to 22:1 (or whatever your sensor max is) on decel?
ya, wideband is pegged when deceling, but it looks like it takes a couple seconds for it to happen (note the TPS -> AFR taking a couple seconds to go full lean). And yes, fuel trims are jacked way the hell up.
Code:
time RPM PSIG Timing Knock TPS Speed_mph LTFT_Idle LTFT_Cruise RearO2AFR 3530.590832 6539.06 22.5495 17 0 86.5058 71.82 5.07813 -7.61719 11.0843 3530.665832 6625 21.9207 18 0 86.5058 71.82 5.07813 -7.61719 11.099 3530.740832 6656.25 21.4371 18 0 86.5058 71.82 5.07813 -7.61719 10.9226 3530.815832 6726.56 16.0683 18 0 86.5058 71.82 5.07813 -7.61719 10.2316 3530.890832 6250 4.94374 34 0 11.1294 71.82 5.07813 -7.61719 13.1278 3530.965832 6093.75 -2.35976 37 0 11.1294 71.82 5.07813 -7.61719 13.1278 3531.040832 5886.72 -7.29324 40 0 11.1294 71.82 5.07813 -7.61719 12.5839 3531.115832 5785.16 -9.27631 40 0 11.1294 71.82 5.07813 -7.61719 12.5839 3531.190832 5761.72 -10.2437 40 0 4.04706 71.82 5.07813 -7.61719 11.4077 3531.265832 5683.59 -10.9692 40 0 4.04706 75.6 5.07813 -7.61719 11.7165 3531.340832 5542.97 -11.2594 40 0 4.04706 75.6 5.07813 -7.61719 12.5839 3531.415832 5406.25 -11.3561 40 0 4.04706 75.6 5.07813 -7.61719 13.2454 3531.490832 5238.28 -11.3561 40 0 1.51765 75.6 5.07813 -7.61719 13.2307 3531.565832 5093.75 -11.4528 40 0 1.51765 75.6 5.07813 -7.61719 13.4366 3531.640832 4933.59 -11.5012 40 0 1.51765 75.6 5.07813 -7.61719 13.8482 3531.715832 4781.25 -11.6463 0 0 1.51765 75.6 5.07813 -7.61719 14.7156 3531.790832 4628.91 -11.8398 0 0 -0.505882 75.6 5.07813 -7.61719 15.8183 3531.865832 4476.56 -11.9849 0 0 -0.505882 74.34 5.07813 -7.61719 17.6266 3531.940832 4312.5 -12.0816 0 0 -0.505882 74.34 5.07813 -7.61719 17.803 3532.015832 3949.22 -12.1784 44 0 -0.505882 74.34 5.07813 -7.61719 19.6555 3532.090832 3320.31 -12.0816 44 0 -0.505882 74.34 5.07813 -7.61719 22.3018 3532.165832 3578.13 -11.9849 -10 0 -0.505882 74.34 5.07813 -7.61719 22.3459 3532.240832 3441.41 -11.4045 -8 0 -0.505882 74.34 5.07813 -7.61719 22.3606 3532.315832 3445.31 -11.1143 -10 0 -0.505882 74.34 5.07813 -7.61719 22.3606 3532.390832 3468.75 -11.1143 -9 0 2.02353 74.34 5.07813 -7.61719 22.3459 3532.465832 3429.69 -11.0659 -6 0 2.02353 73.08 5.07813 -7.61719 22.3459
Injectors generally won't shut off right away, it seems to be once RPM's drop below a certain level at least from what I've noticed on 8/9's. Your AFR's shortly after you got off the throttle (6k down to 5k RPM range) do still look fairly rich though so maybe it is fuel. Have someone follow you and smell it 
Don't need to be behind me to smell it. Smells like **** on a stick 
. It could be the smell of E85 being rich... it could be oil. I don't think it's coolant (but I guess it could be). My overflow tank looks good, the oil needs changed, but it's not frothy or milky (on the dipstick and the fill cap).
::flail::
. It could be the smell of E85 being rich... it could be oil. I don't think it's coolant (but I guess it could be). My overflow tank looks good, the oil needs changed, but it's not frothy or milky (on the dipstick and the fill cap).::flail::
+1 Kracka..in the X's, once you let off the throttle the TPS doesn't come down quickly probably because of the electronic throttle..i do smell it every once in awhile..and yes you're right there Sean your oil might be getting bad now..
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Oh I forgot you're on E85! That could be why the fuel smoke is white instead of the gray/black I was expecting. How big is that new fuel pump of yours? Do you have an aftermarket FPR?
I was DW 1000 cc injectors with a walbro 255 in the tank. On this setup my fuel trims were like ~1% or less (both idle and cruise)
Now I've got the same injectors and the 255 in the tank feeding a surge tank which then is fed through another 255 into the fuel rail. The guy I bought the kit from says that it will affect your idle fuel trims due to the increased fuel pressure.
Maybe what's happening is while the injectors are still open from the WOT (and the ECU is hanging the throttle) it's just DUMPING fuel into the cylinder making the gnarly smell and smoke. Once I get back onto the throttle (and start the sparkplugs again) it's actually burning the fuel.
I've been wondering if a fuel pressure regulator is something I need to be looking at. What's the benefit of one? Does it go before the fuel rail or after the rail?
An aftermarket AFPR goes after the fuel rail and replaces the stock FPR. It will help return excess fuel to the fuel tank, its possible your stock one is being over-run.
I wonder if it would in any way be beneficial to put the stock pump back in the tank? My only concern is you'd run out of fuel on the long WOT stretches.
I wonder if it would in any way be beneficial to put the stock pump back in the tank? My only concern is you'd run out of fuel on the long WOT stretches.
No, the 2nd pump runs all the time. The theory is that the in tank pump isn't really supposed to have that much load on it. Normally with the surge tank you'd just leave the stock pump in there, but since a) I already had the 255 in there and b) I'm on E85 that can't happen...
An aftermarket AFPR goes after the fuel rail and replaces the stock FPR. It will help return excess fuel to the fuel tank, its possible your stock one is being over-run.
I wonder if it would in any way be beneficial to put the stock pump back in the tank? My only concern is you'd run out of fuel on the long WOT stretches.
I wonder if it would in any way be beneficial to put the stock pump back in the tank? My only concern is you'd run out of fuel on the long WOT stretches.
I'm thinking that the combination of my cruise fuel trim being so negative and excess fuel rail pressure is forcing a ton of fuel into the engine when decelling.