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

[badboyr66]

I use the HKS FCD to get rid of the fuel cut

[zerofreez]

Im thinking of getting dsmlink... i would be able to get rid of fuel cut with that, correct???

[biddybengbeng]

"fuel cut" is just a glorified term that means "time to pick your teeth out of the steering wheel"

[Tra2xx]

I am experiencing what I thought was a serious issue with my plugs or wires, like sometimes around 3000rpms if I am at WOT it will kinda 'studder' per se. But now it sounds like fuel cut...
Then again I am running 15PSI on a stock fuel pump
I know I know, I should upgrade...

[96eclipsegst]

Will an Air/Fuel controller fix/minimize fuel cut? I'm getting it really bad with the injen intake and factory BOV. If I replace my BOV will it help?

[talonted_one]

an afc will help with fuel cut

[vault415]

Holy crap I didn't know what fuel cut was until last night when it hit me. I had turned up my boost a bit (too much) and as it went boosting out of control the whole car slammed like it blew up. I stopped the car expecting the whole rear end to be sitting on fire in the ditch but nothing seemed to be wrong. What fun these DSMs are!

[NeedaDSM]

So you are telling me that it is normal to NOT be able to floor my car over 4500 RPM's?

[AznW/BigTurbo]

Originally posted by NeedaDSM
So you are telling me that it is normal to NOT be able to floor my car over 4500 RPM's?

Sorry for the short reply. This happens a lot with upgraded turbo's. For both 1G and 2G with stock MAF, we can only flow a "limited" amount of air before the ECU thinks it needs to cut fuel (safety feature). Doesn't matter if you have upgrade your fuel pump or injector, the stock ECU don't know. I know people have fixed that problem (1G) by placing a small filter where the BOV dumps back and controlling the fuel curve with AFC or somethign similar so you don't go way too lean. With 2G, people can remove the honey comb in the MAF and adjust with AFC. The idea is, in order to get around the factory "fuel cut level," you need to think of ways to sneak in "unmetered" air. VPC will do you good if you have money and you're going to spend $$$ on mods.

AuGustus:laugh:

[RukkusGT]

I am new to this board and hope some of you experienced DSM masters can help. I just bought a 1995 Eagle Talon TSI AWD, and think I just experienced fuel-cut. (felt like slamming on the brakes while trying to accelerate) I put on a cone filter, and the car now cuts out at 4K rpms. I was told that it was most likely an ignition problem so I went and bought Taylor wires and NGK plugs. No fix. A guy with a Talon here in town told me that he experienced the same thing with his car, and that I need to get an adjustable Fuel Pressure Regulator and increase the fuel pressure to 33-38 psi. This sounds great but after looking at my new plugs, it looks as if I'm running a little rich already. I decided to back the screw out on my MAS to hopefully keep the ECU from reading all the air coming in. No fix. Lastly I cut the dump tube, but it still didn't work. If anyone has experienced something like this please respond. It is driving me crazy!

[DefJux]

Well, i had this same problem and it turned out that i was hitting fuel cut because i was hitting as high as 24 psi of boost...do u have a boost gauge?? i dunno, that was just me...hope this helps

[RukkusGT]

No, I don't have a boost gauge yet. I haven't ever adjusted the boost. I have an HKS EVCIV here at the house, but have been waiting until I get my gauges to install it.

[FastRthenU]

With the Evc you can read what your boost/vaccum is. But it wont be in psi. It will be in bar, or mmhg.

[RukkusGT]

Yeah, I thought about just using the controller, but I think I'd like to have an actual gauge in front of me to monitor. If something were to go wrong with the EVC who knows what could happen.

[Newlogics]

I HIGHLY doubt you're actually hitting a fuel cut on stock turbo with stock boost. I was running 18psi ona a stock turbo untill turbo has given up, but never hit a fuel cut.

It sounds a lot like a sizable boost leak. Pressurize the whole intake side and see what you find.

[mockujin]

So if the car never runs lean it wont hit fuel cut? How high can a stock motor take before stuff starts falling off?

[RukkusGT]

My car was getting fuel cut with just a cone filter, and after installing my fuel pressure gauge, I saw my pressure was pushing 52 psi. I fouled out 2 sets of NGK plugs in less than 1500 miles. I bought a B&M FPR and lowered the pressure to 39 psi, and my car is running better than ever. I read my plugs every couple days to check, and they seem to be in great condition after 500 miles so I guess I'll see what happens. I think that I was getting fuel cut because my FPR was stuck and causing more pressure than the pump could put out.

[HyperGSX]

I thought my car was hitting fuel cut because it would just shut off right at WOT when upped the boost. I'd go threw 1 gear or two and then the car would just die, i have an SAFC, fuel pump, and bigger injectors. I'm really sure i'm not running lean either so I don't what the hell is wrong with my car

[RukkusGT]

Yeah, I'm pretty sure I wasn't running lean but I KNOW I was getting fuel cut. I stomped on the gas and at about 3500rpms the car made a loud BANG and stopped so fast I though my tranny locked up. I can't imagine that it is good for the drivetrain. Safety feature or not, I thought my car was falling apart everytime it happened. Thank god it's fixed now because I could have sworn my tranny was on the ground behind me.

[evotuner]

This morning it was extremely cold (0 degrees). My car was up to operating temperature and I went to pass someone on the highway, leaving it in 5th. When I went to pass them, my engine totally cut out until I backed off the throttle (but stayed running). It did this twice. 10 minutes later, it would not do this at all, even taking it up to redline. Did I hit fuel cut, or just because it was extremely cold? I don't have any power mods done except for free mods and balance shaft removed. Any advice?

[DevilSperm]

sounds to me like fuel cut...mine would do it really bad if it was under 10 degrees...being that cold you are cramming a lot of air in the cylinder

[noreaga0221]

fuel cut is not caused by fuel levels, lack of it or too much. its caused by maf over run. when your big turbo sucks in too much air the ecu gets scared and helps the defenseless engine by shutting it down for a second or so. al blaha mas, 2g mas's both help cure fuel cut for 1g's expierencing it. al blaha mafs help because they trick the ecu into seeing colder air so its expects to see more air. and 2g mafs are just bigger.

[bobo2986]

it typically happens when it is really cold outside and when I am getting on the throttle but not always

[boostineklipz]

stock turbo, Apexi N1 downpipe N1 catback exhaust, greddy intercooler pipping, Bitz turbo timer, greddy type S BOV, and injen intake...

Do you have a boost controller?? If your getting fuel cut all the time, that means you might be running alot of boost for some reason. I hope you have a boost gauge. How much boost are u running????

[sential]

I cant tell if I'm hitting fuel cut or if my plugs are bad. Do the two problems feel any different?

[dave99gst]

if it was fuel cut .. you would know it- - its like all of a suden nailing a brick wall. plugs is more of a miss/studder

[sential]

well I hate that answer cause that's what everyone says. I know that I've hit fuel cut before, and it sucks. But don't bad plugs create the same effect. They go out, you dont get spark, and bam... your car studders/hesitates/cuts out... whatever, I just can't seem to tell the difference

[dave99gst]

improperly gap's plugs -- or fubard plugs may only miss while under load/boost- and its not the same as fuel cut -- if ya want to know what its like.... have somone drive yer car -- and have then launch the shi* out of it .. all the mean while you try to hold your face around 8" away from the windshield..then when the drivers gets in say 3rd gear...( stilll floor'd ) they can let off the gas ( go from floor'd to nothing ) at a time when you aint ready for it.. you will prob slam yer face into the windshield. fuel cut is the same.. ECU lets off the gas when you aint ready for it. aka - cuts the fuel .. plugs are much more bearable.. more of a studder/stumble/ miss

[sential]

thanks for the reply, It sounds like its fuel cut.

[GSX90]

Originally posted by sential
thanks for the reply, It sounds like its fuel cut.

Can you get yourself a fuel cut defenser? What kind of EGTs you seeing?