i just bought a 87 turbo supra. and i have a fuel cut problem. it has the aftermarket hks blowoff valve and 5 quart innercooler set up. i can get through first gear just fine but once i get into sec my fuel cuts out at 5lbs of boost. some ppl say it could be my fuel filter. i cant find the other one, and the one in the front is over passed by the fuel pressure regulator. any advice?
fuel cut out at about 5 lbs
- Thread starter suprafast
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Could be the fuel pump itself too. I've ran into that more times than I would have liked.
Check to make sure it holds pressure for several hours after the car is off.
Check to make sure it holds pressure for several hours after the car is off.
idk, all i know is its fuel cut off cuz right as it hits 5 lbs in every gear but 1st its studders and wont go any faster and spudders, my engine light comes on everytime it happens, but then turns off after 15 seconds
The same thing just started happining to me. Two days ago I was able to hit 12psi no problem. Now just around 5psi the car will lean out (looking at my air/fuel gauge) and if you don't back off the gas the fuel cut will kick in (which is a good thing)
I need to know my fuel pressure under boost... I don't have that gauge. I need replace my fuel filters anyway and then I will test it. I will install my Walboro Fuel pump and FPR next.
I just find it hard to beleve that one minute fuel flow is good enough for 12psi than the next minute not enough for 5psi anyway, I will let you know as soon as I figure it out or if anyone has any other ideas...
I need to know my fuel pressure under boost... I don't have that gauge. I need replace my fuel filters anyway and then I will test it. I will install my Walboro Fuel pump and FPR next.
I just find it hard to beleve that one minute fuel flow is good enough for 12psi than the next minute not enough for 5psi anyway, I will let you know as soon as I figure it out or if anyone has any other ideas...
thats exactly what is happening to mine. it cuts out bad but if i ease it and keep it under 5lbs its fine
I would check for a boost leak before looking at the fuel system. If you haven't at least tightened every single clamp on your IC pipes then you can't be sure (even then you're only 50% sure because you could have a cracked hose).
The hardest ones to reach are the most likely culprit.
The hardest ones to reach are the most likely culprit.
sorry im new to this turbo stuff, il check the all the pipes. i just need to check all the ones leading to the turbo right ?
Follow the piping from the intake manifold (pipe that says 3000 on top connects to the throttle body) all the way back to the turbo.
In your way should be the fender(upper piping goes through this) and the intercooler (looks like a small, chunky, radiator and sits in front of the radiator).
In your way should be the fender(upper piping goes through this) and the intercooler (looks like a small, chunky, radiator and sits in front of the radiator).
im not that stupid tho haha. ya i have 5inch thick innercooler. i know that when i bought it . the trip home the charge pipe came off from the turbo, so we thought it blew the turbo. but we took of everythign to get to the turbo and the pipe was just off. so we put it back on, i tightened it good, and it had the same cut off problem when i bought it, but i cant complain when i bought it from an old couple for only 1200
The fuel pump can die that quickly, trust me. One way that you can check without taking anything apart is to turn on the fuel pump (check the TSRM or search, you can do it with a paper clip) and listen to the fuel pump. If you can hear it in the car, there very well could be a problem. Also, you should be able to hear a pretty loud trickle sound right by the regulator, if you don't hear anything then that also points toward a fuel issue.
im not positive on this, but I don't beleive the fuel pump/fuel pressure has any effect on where the fuel cut hits. It is only from the AFM signal. The fuel system may not be functioning correctly but that does not cause the early fuel cut.
Check for boost leaks.
Check for boost leaks.
Well, I changed the fuel filter last night...No change, but I needed to do it. Good news is a check engine light came on, so that might tell me something. I'm in class right now, but as soon as I get a break, I will check it.
With a boost leak I think you would run rich because the AFM would read more air is comming in to the system than actually is, so you would have extra fuel and less air. I maybe wrong...?
I will let you know ASAP.
With a boost leak I think you would run rich because the AFM would read more air is comming in to the system than actually is, so you would have extra fuel and less air. I maybe wrong...?
I will let you know ASAP.
Boost leak, check all the pipes and vaccum lines. One time one of the small vaccum lines UNDER the intake mani fell off and my car was doing this. Im willing to bet its something like that.
With that many codes it's not going to be simple. Start working on them 1 by 1 and you'll have it running great in no time.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=26
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=26
where is the second fuel filter located. not the one under the hood but i heard there is a second one.