I have recently been started hitting fuel cut when Im at full throttle. My stock bypass valve stopped working and once i replaced it I began hitting fuel cut. I have full 3in turbo back exhaust, and a cone filter. But I dont hit fuel cut instantly. It goes to 8 and then creeps up to 11 (fuel cut). Whats wrong?
Hitting Fuel Cut??
- Thread starter 1992supraman
- Start date
Ive checked for boost leaks, none. and im not running a boost controller. Ive just got full 3in turbo back and a cone filter. thats it.
If it started happening when you replaced the bypass valve, that's the first place to start looking.
Also, a valve that's being pushed open under boost IS a boost leak.
Also, a valve that's being pushed open under boost IS a boost leak.
My old bypass valve was not working at all so it was open all the time. Due to the HUGE boost leak it wouldnt boost very high. I fixed the bypass valve with a brand new functioning bypass valve. ive checked it several times so i know its not that. has anyone heard of the stock wastegate going bad?
If you say your boost is creeping to 11psi then that is your problem. I think these cars start hitting fuel cut stock anywhere between 12-14psi. Some cars vary by a psi or so. Do you have an aftermarket boost gauge? I would say that opening the exhaust allowed the turbo to spin more freelly, thus resulting in the creeping/fuel cut. Get a cheap, manual boost controller and set it to hold 10psi solid. If your wastegate was bad, you would either get no boost cause it's stuck open, or serious boost spikes (20psi+) cause it's opening too slow or not at all.
You know I did the same thing. Just put on a full 3 inch from the turbo back and new blow off valve. Last night a civic pulled up on the freeway and wanted to play so I said ok and floored it. I saw the boost hit 8 and then started to creep past and then BAM!! fuel cut along with check engine light. I was pissed. I am looking for the thread that showed how to make your own boost leak checker.
..Which im in the process of fixing right now.Heh. More boost won't DIRECTLY cause a BHG, but it can certainly be a contributing factor. FCO, though, I can't see how that could cause a BHG. The whole point of fuel cut is to keep the engine from overstraining, or running dangerously lean should an injector go static.
toyzforme;900738 said:
yeah thats EXACTLY what caused me to post this thread. I had hit fuel cut a couple times a while ago but last friday i was on the highway and pulled up next to a turbo civic hatch. EXACT SAME THING happened to me. 8psi and then creep to FC. If you find that thread could you post it in this thread?
Boost creep basically means that your wastegate is inadequate for bypassing the turbine. This doesn't seem like boost leak.
Not sure what the temp is where you live, but FC will happen at lower flow/boost with cooler temps. Also, the high flow exhaust seems to promote boost creep, since a restrictive exhaust will decrease pressure differential across the turbine, making the wastegate have to do more work.
Not sure what the temp is where you live, but FC will happen at lower flow/boost with cooler temps. Also, the high flow exhaust seems to promote boost creep, since a restrictive exhaust will decrease pressure differential across the turbine, making the wastegate have to do more work.