Fuel Cut: What is it? How do I fix it? [merged]

[Slanted J]

All fuel cut threads are combined here.

I've tried doing a search but to no avail.

I was just wondering what Fuel Cut is. I've heard it tossed around alot, but do not actually know the details behind it. And, naturally, I can gather that its when the fuel is cut off, but when and why.


Thanx,
Jon

 

[oldman]

Boost leak test! Fuel cut or not.

Also, there is no question that the 255 is overrunning the stock FPR unless something went wrong with the fuel pump installation, an AFPR is definitely needed.

 

[yukondoit]

boost is setup stock with the boost controller mod

 

[yukondoit]

ok fixed the leaks and the car runs better but it still jerks, im starting to think it may be tranny related

 

[bluetlr2001]

ok i need some guru help. Ive got a 97 gst with just bolt ons. But the problem ive been having is fuel cut and it acts like it loads up at 18psi. But it just started recently since i put a new timing belt, air filter and plugs. Ive got an hks evc and the car runs fine on 12 or 16psi but if i push 18psi its cuts out . So please help me i dont know if i need a fuel controller or what. hopefully its something easy 2 fix.

 

[Apeximprt2nr]

It is an easy fix. Just keep the boost down for now until you get some type of fuel controller. That's the only way.

 

[bluetlr2001]

thats what i am doiong now. buts its just weird that it just started. So do u think that a fuel controller will since ive got stock injectors and fuel pump.

 

[bluetlr2001]

Come on guys i need some help. also it still has the stock t-25 and it also has a miss 2 it when its idiling. IF anyone has any more suggestions on stuff 2 check let me know

 

[Jeremoose]

You need a larger fuel pump to run more than 15 psi, I would suggest a walbro 190 if you don't plan on upgrading your turbo much past a 14b/small 16g; if you buy the walbro 255 your going to need something controlling the fuel.

So grab a walbro 190 and be done with it, or a walbro 255 with an FPR and call it a day.

 

[bluetlr2001]

Thanks for the advice. im going 2 check my fuel pressure 2marrow to c what ive got. IF its low ill just invest in a bigger 1

 

[bluetlr2001]

If i do the 190 fuel pump will my stock injectors b ok or do i need 2 buy more. And ive got a 14b to go on it sooner or later

 

[Jeremoose]

If your planning on sticking with the 14b the walbro 190 will be fine and you wont' need injectors... If your planning on turning the car into more of a monster later, you'll need the walbro 255 and some injectors eventually.

 

[CanadianTSi]

Fuel Cut has nothing to do ith Fuel.

If your hitting fuel cut with the T-25 then you have a boost leak. Make a tester and find and fix your leak(s).

A 190 Fuel pump is always a good idea and will take you alot farther then most people think.

 

[oldman]

Fuel Cut has nothing to do ith Fuel.

If your hitting fuel cut with the T-25 then you have a boost leak. Make a tester and find and fix your leak(s).

That's right.

A 190 Fuel pump is always a good idea and will take you alot farther then most people think.

Didn't you just upgrade to the 255 recently?

 

[CanadianTSi]

That's right.


Didn't you just upgrade to the 255 recently?

Nope...still the 190 on stock wiring doing 121mph traps on pump gas in my full weight 2g

 

[bluetlr2001]

well ive got good fuel pressure and i headed to home depot 2 get the stuff to make a bbost leak tester. but ive got another question if i have a leak wouldnt it hit fuel cut on 15-16psi also.

 

[No_Skillz]

Really just depends on how bad the leak is. Btw, on a stock fuel system you shouldn't be running more than 15psi with no leaks.

 

[bluetlr2001]

cool well i guess im going to invest in a fuel pump anyways even if it is just a leak. what r some reasonable places to buy 1 from.

 

[No_Skillz]

Any of the vendors that sponsor this site. Even after a new pump be sure to get a logger before turning up boost.

 

[bluetlr2001]

Also if i do the fuel pumpwill i still need to look into to getteing an afc or will the ecu be enough . because im trying to save up to get a new tranny mines shot .

 

[Jeremoose]

If you go with a walbro 190 you shouldn't need an AFC if you go with a 255 you will need one I believe.

 

[LASER4G63T]

i made a mbc from home depot parts and it works amazingly well.

 

[bluetlr2001]

OK i done a boost leak test and found two leaks a clamp and its also leaking around the tps. But i fixed the clamp and now when i boost 18psi it starts spittign and sputtering. Any suggestions maybe the fuel pump might help. also i couldnt get my bov to qiut laking while i was testing it, i even put all the washers and it still leaks so i couldnt cheak it that good.

 

[No_Skillz]

Geeze, bring it down to 15 already. Your car can't handle anything more right now.

You still have leaks... so fix them. It's pretty obvious. Getting just a pump at this point won't do a thing since your ecu is reading the aircount from the MAF and saying "hell no."

Or you can just continue to kill your car on 18psi with the t-25.

 

[bluetlr2001]

Chill im just running 15 rite now but i put it on 18 to see what it would do. but im still going to get a fuel pump

 

[99gsx0221]

I have a 99 gsx, and since i got my apexi gt downpipe and my hks carbon-ti exhaust on my car seems to have a fuel cut at ~5700rpm... I turned boost down, and my boost gauge showed im only running 11 psi on my 14b that is ported and clipped..

Is this fuel cut? Or is there something wrong when they installed my exhaust system?
Please help!