JustAnotherVictim said:
A misfire maybe? All other time's I've hit fuel cut it's like 89jdm said, a violent meeting with the steering wheel as your knee hits the dash and you go "WTF!"
Fuel Cut at 9psi with DDP
- Thread starter MassSupra89
- Start date
A misfire maybe? All other time's I've hit fuel cut it's like 89jdm said, a violent meeting with the steering wheel as your knee hits the dash and you go "WTF!"
JustAnotherVictim
Supramania Contributor
Pretty sure it wasn't a misfire, maybe I shouldn't have said dying but you tell there was a loss of power. I won't rule it out but it felt more like fc. My Cel came on is why I think it wasn't.
So I did another 2k-5k 3rd gear pull and it did it again right around 5k. Just holding 9psi then BOOM. and it goes back to riding totally normal, and CEL goes off as soon as I take my foot off the gas, which was about 1 second. I'm chalking it up to that when I get to higher rpm the DDP is just moving more air than the fuel system can handle and it runs too lean?:1zhelp:
Looks like its wideband time.
Looks like its wideband time.
JustAnotherVictim
Supramania Contributor
Yea, So if the engine pulled in more air than the fuel system could accomodate for... it would hit FC, so if it ran too lean, would the system know to hit FC? I forget exactly how the AFM works though, and I just got home from a 12 hour work day... So I'll have a better idea in the morning.
JustAnotherVictim
Supramania Contributor
FC happens because you don't have enough fuel to support the air you're taking in iirc. So the ecu monitors the afm readings and cuts the fuel so you can't go no mo'.
well... the ecu assumes you don't have the fuel to support the air so it hits fuel cut 
get a fcd!
LOL
well that's what i did and all my problems went away
(altho i did dyno it before i did any wot pulls to make sure i had the fuel)
get a fcd!
LOL
well that's what i did and all my problems went away
(altho i did dyno it before i did any wot pulls to make sure i had the fuel)
JustAnotherVictim
Supramania Contributor
Blow it up ftw!! Unless you do have the proper fuel too support then by all means hook one up.suprra_girl said:
shouldn't be hitting that early :-/.... honestly... check for boost leaks, or anything that could be causing the motor to use more fuel than it should... i did a boost leak test today, and boy, i had some interesting leaks... so a lot of air was escaping that was coming through the afm, which means i was running pretty rich, and this was at around 11-12 psi, and i could still go wot till the top of 4th gear when i would hit cut, but i've yet to run it up to those speeds after i sealed up the leaks.... i'll get back to ya, and see how my car acts now
Ya, sounds like a thorough boost leak test is in order...
I don't want to go FCD because once I get the time/money I'm going with MaftPro and all the good stuff. And I dont have the dyno time so I don't want to blow it up lol.
I don't want to go FCD because once I get the time/money I'm going with MaftPro and all the good stuff. And I dont have the dyno time so I don't want to blow it up lol.
The only time you should be hitting FCO that early is with an upgraded turbo, improperly set TPS, broken AFM, or boost leak.
Yeah, there are a number of things that could cause the fuel cut to activate at such a low PSI. Mainly boost leak.
One thing to remember is that the fuel cut from the ecu is not based on actual boost pressure, but rather air flow readings from the AFM. So when the cut actually happens, it can vary depending on mods. The more mods you have, the more likely that the fuel cut will activate at a lower PSI.
One thing to remember is that the fuel cut from the ecu is not based on actual boost pressure, but rather air flow readings from the AFM. So when the cut actually happens, it can vary depending on mods. The more mods you have, the more likely that the fuel cut will activate at a lower PSI.
Well I just did a 4th gear pull and realized it slowly crept from 8psi, to 11psi, and then it hit FC again. I'm guessing a small boost leak.