Fuel Cut Problems

[style619s]

So I'm having more fuel cut problems and I'm not sure why. I tried the Treadstone FCD, which I couldn't get tuned - I tried all of the little notches. Now I just got a brand new missing link and still no luck.

Any ideas?

 

[habitatguy187]

Why are you hitting fuel cut? Too much boost or boost leak somewhere? If it's because of too much boost I would contact the product manufacturer if you bought it new.

 

[style619s]

i dont have a boost leak i fixed that and i dont see why i would hit a fuel cut from too much boost i mean isnt why u get a missing link but i dnt think im running too much boost

it hits at 4500 rpms at about 6 or 7 lbs

 

[VelocitàPaola]

Here's one idea, learn these characters: "." and "," and "?" and maybe even ":" and ";" or "!".

Also, be a little more descriptive about your problem and fill out your profile so we know what we're dealing with here...

 

[mindset]

i dont have a boost leak i fixed that and i dont see why i would hit a fuel cut from too much boost i mean isnt why u get a missing link but i dnt think im running too much boost

it hits at 4500 rpms at about 6 or 7 lbs

Hmm that seems kind of low for the psi.
You should do another boost leak test just to be sure.
You could even have a bad wastegate.

 

[totaleclipse_05]

Hmm that seems kind of low for the psi.
You should do another boost leak test just to be sure.
You could even have a bad wastegate.

Check what section you are in.

style, how did you set the voltage on your Treadstone FCD? Did you use a multimeter and set it around 4.5-4.6v? Did you blow the MAP sensor while setting?

 

[style619s]

no the guy i talk to on the phone said all you have connect the wires on FCD and u open it and there is a small wheel inside wit notches and thats how u get the right voltage for your car but none of them worked so i donno



silver eclipse dude i know u high in rankin here but dont leave any smart ass comments here

 

[VelocitàPaola]

silver eclipse dude i know u high in rankin here but dont leave any smart ass comments here

I assume you're talking to me (though my Eclipse is white).

My job here is to enforce the rules and you broke those rules three times in this thread alone. We don't ask for all of our members to be grammarians, simply attempt to use proper punctuation and spelling.

This rule works to your benefit as it's extraordinarily difficult to convey a message without decent grammar.


Secondly, please either fill out your profile or list specifically what modifications you have installed. We're shooting in the dark without knowing what's done to your car.

 

[style619s]

just did

and no one had a problem with it but wut eve ...gotcha

 

[VelocitàPaola]

You didn't include any information about your fuel system. Do you have an upgraded fuel pump or some sort of aftermarket fuel pressure regulator?

 

[style619s]

oh yeh sorry stock injectors, FMU, and im not sure if its walbro 255.... if its not would that cause a fuel cut ???

 

[VelocitàPaola]

Probably, yes. Generally, boost-related fuel cut caused by the ECU happens at around 1-2psi. When it happens at six or seven psi, a component in your fuel system (in this case the fuel pump) hit its limit.

 

[style619s]

yeah that makes sense because what else would it be... so when i check my fuel pump how would i know if its walbro or just stock ???

 

[VelocitàPaola]

For one, the Walbro says "Walbro" and has the Walbro logo stamped on the side. There's also a part number. You'll need to make sure this part number corresponds to the 255LPH HP pump (GSS342).

 

[style619s]

oh ok well that explains... im ganna check it tomorrow and isnt the walbro is shorter than the stock one or the other way around ??

 

[VelocitàPaola]

I don't remember, but there isn't enough of a difference where you could tell without both of them right next to each other to compare.

 

[style619s]

ok well thanks alot man sorry about what i said to you at the beginning

 

[habitatguy187]

oh ok well that explains... im ganna check it tomorrow and isnt the walbro is shorter than the stock one or the other way around ??

Yes the walbro is significantly smaller than the stock pump, at least one a 1g.

 

[style619s]

yeah thats wut i was thinking but thanks man

 

[style619s]

UPDATE
i found the reason why i was having all the fuel cut problems... the FMU crapped out and it was running 75psi at idle. SO my injectors were maxed out at 5 lbs, since its 12:1 12*5=60 plus 75 so 135 psi wow....

 

[spitefire1]

i thought maybe the fuel problems would be bc you didnt have a missing link or turno map sensor. your stock map sensor see boost and stop the fuel! maybe you can try that! good luck

 

[style619s]

no i try both new missing link and i tryed FCD no luck but im installing potrfueler as we speak

 

[rstare]

An fmu doesn't control idle fuel pressure, so unless it was restricting the line somehow it was the fpr that was the source of your problem.
It was probably your fuel pump that was maxed out since it only handles pressures up to about 140psi.

 

[style619s]

yeah injectors would max out too when you running high fuel pressure and i replaced the fuel pump it was a walbro 190 with some kind of 12V mod ???? so i replaced it with 255