How am i hitting fuel cut?

[laloosh]

Ok here is the story. My car had a i/2nd cat hollowed out/mbc set to 18psi for over a month and it ran fine for the month or so it was on with zero problems ever. Yesterda I installed a TBE and turned the boost down to stock levels of 14-15 psi. Today was 45-50 degrees out at night and in anything after the first two gears the car is cutting out. Keep in mind i have the atp boost cut defender and the boost guage never reads over 14-15 psi, so it has to be fuel cut. Is it possible that some how with my two power mods i am running out of fuel!? This is retarded and i dont understand how i dont run out of fuel at 18psi, but i run out of fuel at 14 psi with a TBE. Any answers? Am i having some other kind of problem?

[Captain KRM P5]

we ran this exhaust on truboost's car in the dead of chicago winter and did not hit fuel cut with it on stock boost. he had an intake as well. the turbo could be spiking real high, real fast and then settling down, but the BCD should resolve all this.

it could be a faulty BCD. the one on our ms6 broke and the car was doing the same thing all of a sudden.

[laloosh]

the thing is that im not spiking, nor am i hitting a high psi. It does it lil spike to 16-17 pulls past it to hold 14-15 and then around 4500rpm is started to stutter a little and then it sounded like bomb went off. I think i might have shot fire out of my exhaust. Now i know there is noway in hell that im running to rich right now.....right? So i gotta be leaning out and hitting fuel cut. if thats the story i hope this new fuel pump solves my issue.

[controlo]

i get the same thing man. i have an injen cai, test pipe. when i shift fast between gears, sometimes it will stumble as soon as the boost hits and then boost fine for the remainder of the gear.

[palerider]

Now i know there is noway in hell that im running to rich right now.....right? So i gotta be leaning out and hitting fuel cut.

Look at my dyno with just intake and Vibrant DPback. Im running WAY richer after installing my exhaust. Just nuts.

118788 Red is with the exhaust.

I wouldnt assume anything with this ECU. Check out my thread in the MS3 Engine section. Your input would be appreciated.

[laloosh]

honestly it the car absolutly rips until it hits the surging/cutting. theres noway in hell that im running to rich and fouling out. its gotta be running lean.

[AutoXRacer]

Why did you guys change the exhaust? Was it only for sound?
I've been reading that the stock exhaust is pretty good and not very restrictive...but it is a little quiet for some folks...

[laloosh]

its a full turbo back exhaust. meaning downpipe/midpipe/catback.

[SharkDiver]

Ok here is the story. My car had a i/2nd cat hollowed out/mbc set to 18psi for over a month and it ran fine for the month or so it was on with zero problems ever. Yesterda I installed a TBE and turned the boost down to stock levels of 14-15 psi. Today was 45-50 degrees out at night and in anything after the first two gears the car is cutting out. Keep in mind i have the atp boost cut defender and the boost guage never reads over 14-15 psi, so it has to be fuel cut. Is it possible that some how with my two power mods i am running out of fuel!? This is retarded and i dont understand how i dont run out of fuel at 18psi, but i run out of fuel at 14 psi with a TBE. Any answers? Am i having some other kind of problem?

My car is doing the same thing.I have the boost set to about 17psi but when I get to about 4k rpm my boost drops to 14-15 and studders,The boost will bounce between 14-15.I got the bad spiking under control but now I have this problem.I will even do it with the boost turned all the way down.When I remove my mbc and put it back to stock and leave the fcd on it stops doing it.Ive been tring to figure this problem out also,I think it may be fuel cut.Is there a way to test the fcd?Can I use a compressor or somthing?

[laloosh]

i dunno if i mentioned it in this thread becuase i posted this in a couple places, but i removed my mbc/fcd and the car is still doing it if not got worse. its nothing to do with the amount of boost the car is running cause it never ran a high amount after the tbe install. its got something to do with the pos fuel pump and providing enough fuel at cold temps

[AutoXRacer]

its a full turbo back exhaust. meaning downpipe/midpipe/catback.

Thats what I meant... I was looking to upgrade the downpipe, but I was told that the stock exhaust system on the MS3 is pretty good as is. The pressure drop through the cat is gained back through the rest of the exhaust...

Just trying to understand the reason for changing out the exhaust system specifically on this car. Supposedly there are no significant gains by replacing it other than sound... Seems like this car doesn't like to many mods...

Thanks...

[laloosh]

Thats what I meant... I was looking to upgrade the downpipe, but I was told that the stock exhaust system on the MS3 is pretty good as is. The pressure drop through the cat is gained back through the rest of the exhaust...

Just trying to understand the reason for changing out the exhaust system specifically on this car. Supposedly there are no significant gains by replacing it other than sound... Seems like this car doesn't like to many mods...

Thanks...

a tbe exhaust gains up to 30 whp through out the band and sees peak gains of about 20.

[AutoXRacer]

Really? That much...? Wow...
I was talking with BEGi and they swear there is not much to gain from an exhaust... Hmm...(uhm)

[laloosh]

Really? That much...? Wow...
I was talking with BEGi and they swear there is not much to gain from an exhaust... Hmm...(uhm)

from a catback. not from a full tbe

[javanc]

Hey laloosh. HAve you pulled your plugs and checked them yet? Just as part of the data gathering id do it.

[laloosh]

well here is an update. on the way to the gas station, its 52 degrees out, the car did its usuall stutter. i got gas, the stutter has yet to come back. im gonna be pissed if i spent all this time playing with differnt set ups only for it to be a bad tank of gas.

What i tried.
1. i was running a lil knn crank breather along with the capped hole on the intake. i put it back to stock nothing seemed to change.

2. i tried playing with the bpv springs and went to the yellow spring instead of the blue thinking that maybe its too hard...nothing changed

3. i checked every single hose for a vacum leak...nothing

4. i looked undercar for visiable exhaust leaks, no soot to be found anywhere.

5. i got gas and it has yet to happen.

[palerider]

I dont think you'll be pissed....lol. This will be one of those funny memories you'll remember about your car for years. And you'll remember it fondly because nothing was busted.:)

Lets hope thats it... keep us updated.

[laloosh]

im gonna pull the ic off and check the plugs right now just to be sure.

[driver311]

laloosh my car just started doing this same shit. I checked all the plugs and they were good and gapped at 28 from the factory. im stumped on why its doing this also. I checked all hose clamps and even tried turning the boost down to 15psi and still does it.

[SharkDiver]

laloosh my car just started doing this same shit. I checked all the plugs and they were good and gapped at 28 from the factory. im stumped on why its doing this also. I checked all hose clamps and even tried turning the boost down to 15psi and still does it.

Is yours doing it at about 4k rpms?Thats when mine starts to do it.Is this doing any damage to the motor you guys think?

[laloosh]

its the cold air 100 percent. my ems is in the mail. I can't deals with this shit after the tbe install

[ill_eagle94]

It has to be the cold air (in combination with mods). If it's below 54 degrees, it starts doing it. The colder it gets, the more it acts up. With the stock BPV on, I do not notice it, but I have noticed in a couple situations that there is a slight loss in power at times with the stocker. This to me seems like it is leaking. It leaks before I get to the point of getting the fuel cut.

I really hope that the BCD helps, but I am thinking that it will not.

Laloosh, when you get your parts, would you mind tossing on the fuel pump before installing the EMS and seeing if that takes care of the issue for you? That would be awesome.

[ms3guy22]

i feel bad for you guys, the wheather here hasn't dropped below 60, and i'm running custom fmic, cobb sri, txs dp and test pipe. i've hit fuel cut once in 3rd gear around 5 grand. I would lilke to say its your mbc but you've already beat that option. i know i'm running the stock cat-back but everybody know replacing that is only good for like 6 ponies

[laloosh]

Heres a theory, are we maxing out the mafs with the cold weather?

[ill_eagle94]

Heres a theory, are we maxing out the mafs with the cold weather?

I'd like to say yes, but if people are running the 3071 or the 3076 on the stock MAF, then I'd have to say no to that one.

[staples187]

I've hit fuel cut once in 3rd gear with my current layout. Everyone is saying the CPE EMS will help this out, I'm sure hoping so!

[zoom-zoomhatch]

I had this happen last night and figured it had to do with my mods+cold temperatures causeing the turbo to spike a little high and hitting boost/fuel cut. It went fine in third and I hit 4th and it was like a real bad bucking and stuttering, so the standback should fix this yes?

[Nutari]

laloosh my car just started doing this same shit. I checked all the plugs and they were good and gapped at 28 from the factory. im stumped on why its doing this also. I checked all hose clamps and even tried turning the boost down to 15psi and still does it.

I think its kinda funny how the two guys that SWORE by MBC and the BCD are now having problems.

EMS guys... do things the right way from the start.

(deadhorse (spank)

I hope you get your issues resolved.

[laloosh]

what funnier is how I took it off and it got worse

[Nutari]

what funnier is how I took it off and it got worse

Im thinking its because you had the boost turned up without proper tuning and now somethings broken.

[laloosh]

nope if its over 55 degrees out the car runs great.

[Nutari]

nope if its over 55 degrees out the car runs great.

Well, we have guys running EMS systems that have no problem driving in snow. :)

Which EMS did you end up going with?

[laloosh]

trust me nothing is broken the car pulls hard as hell over 55 degrees

[matsuda]

Anyone with these problems should connect an OBD scanner and check for any codes. There are some non-emission related codes that will not cause a CEL.

[SharkDiver]

Anyone with these problems should connect an OBD scanner and check for any codes. There are some non-emission related codes that will not cause a CEL.

I will try that with my scanner.Thanks

[itzl0l]

so after ur tank of gas has it the fuel cut come back?

[laloosh]

yup

[itzl0l]

so it was a leaky bov huh? fun stuff...glad u got it figured out man. I was getting sick of every1 bashing you saying you broke your car....morons.

[Vindikacione]

Laloosh- I think you fixed your problem with the EMS, true?

[laloosh]

it wasnt the bpv, it was my fuel pump, the ems didnt change shit, i said it a bunch of times and ill say it again, to me its not worth it unless you go big turbo. I have because i though i needed a tune, the only part im using of hte ems is the boost controller part, its set to 18 andt thats it. Its a maf car pushing 3 psi over stock, if the fuel is there...theres no problems.

[Mid_Life_Crisis]

it wasnt the bpv, it was my fuel pump, the ems didnt change shit, i said it a bunch of times and ill say it again, to me its not worth it unless you go big turbo. I have because i though i needed a tune, the only part im using of hte ems is the boost controller part, its set to 18 andt thats it. Its a maf car pushing 3 psi over stock, if the fuel is there...theres no problems.

Laloosh - It's hard to keep up with your adventures across all the different threads (looking for an emoticon that looks like Sherlock Holmes). After all is said and done, what mods do you have on the car right now? No abbreviations please, some of us don't know them all. What are you datalogging with? The CPE unit? Thanks.

[laloosh]

intake/turboback/ems/pg fuel pump/forge bypass valve/cobb springs/trz derlin motor mount.

[sp33d 3]

how much was the pg fuel pump?

[AutoXRacer]

Laloosh, did you resolve your issue of fuel cut or whatever was going on with your engine during cold weather...?

Did the fuel pump resolve your issue...?

On your previous post:

Originally Posted by laloosh http://static.mazdas247.com/buttons/viewpost.gif (http://www.mazdas247.com/forum/showthread.php?p=3531253#post3531253)
it wasnt the bpv, it was my fuel pump, the ems didnt change shit, i said it a bunch of times and ill say it again, to me its not worth it unless you go big turbo. I have because i though i needed a tune, the only part im using of hte ems is the boost controller part, its set to 18 andt thats it. Its a maf car pushing 3 psi over stock, if the fuel is there...theres no problems.


Are you referring to the EMS that its not worth it unless you go big turbo...?

[laloosh]

fuel pump solved everything, yes ure correct about my ems opinion

[x'ed]

SAme thing happens to me all the damn time, I knew I should have bought a fuel pump before springs and test pipe. O well, thank god for christmas, lol.

[x'ed]

And oh yeah, I agree about the ems, what the hell is the point if you are running a bc and bcd, its just doing the same damn thing, our cars would make just as much power as Laloosh's with a bc and bcd and not an ems (including his other mods of course). I expect to run about low 13's with a test pipe, bc, bcd, and a fuel pump on street tires.