bad fuel pressure regulator?

[Luiyi]

so my car has been sputtering and have weird idling problems and cant seem to find anything, i checked for any vaccum leaks and nothing so idid some research and SAYS THAT I MIGHT HAVE A BAD FUEL PRESSURE REGULATOR I HAVE A NISMO REGULATOR I THINK AND ITS ADJUSTABLE I GUESS SINCE IT HAS A SCREW ON THE TOP ON IT..

butttttttt i dont want to touch it or move it and something goes wrong
does anyone know if i can adjust and how??

so here aRE SOME VIDEOS of my car showing you what problem it has hopefully u guys can help me out

car idling when i first start it
http://youtu.be/12pSj0LPpws

fuel pressure regulator
http://youtu.be/DRiLQXfWD10

car idling after warming up
http://youtu.be/uk7EHL3wZ_s

car doesnt throw any kind of smoke from exhaust
http://youtu.be/4BFIV2zuZqM

car sputters after 5k rpm
http://youtu.be/Lso_dgP8W7E



would gladly appreciate it

[Jtuned_andy]

do you have a gauge? how do you know your fuel pressure is adjusted properly? start with the basics...

[Luiyi]

i have a fuel/air ratio gauge.. the gauge reads from 13.0-15.0 when it was normal it was reading
12.0-12.5

and my car is running alil rich but doesnt throw black smoke, just alil smell of gas.. but when it idles i look at my gauge and it says 13.5,13.7,13.5 then again 13.7 then when the rpms are around 1,300 it drops up and down ffrom 1300 -1000 rpm then stops and goes back to normal..

but car SPUTTERS RETARDED WHEN I PUNCH THE GAS

[Luiyi]

okay so when im at a red light the car idles not high or anthing but goes up and down up and down but not tothe point where the car turns off it idles at about 1,500 rpms

then when i start spooling and giving it full throttle the car sputters and as if the car isnt going nowhere it goes burrrrrrrrrrrrrrrrrrrrrrrrr and doesnt pick up boost unless i let go of the throttle alil then it picks up

[Jtuned_andy]

Boost leaks, dirty IACV, improperly adjust fuel pressure, could be a bunch of things

sounds like you have multiple problems. start at the beginning. check your plug gaps, look for boost leaks, set base fuel pressure, time the engine properly, look at your o2 sensor

[Luiyi]

if u read what i responded the first time i edited it to show u what my ratios are..

i already checked for boost leaks and vaccum leaks and nothing then i had a exhaust leak so i checked that i also checked my injectors but not my spark plugs i will do that sometime this weekend..

do u know what can be the problem of my car sputtering when hitting boost?

[jr_ss]

Your fuel pressure is not your air fuel ratio... You need a gauge on the return side of your fuel rail to see what PSI fuel pressure you are running. You cannot adjust fuel pressure without a PSI guage.

Your Air fuel ratio is lean, and you need to richen it up. 12.5:1 is not a safe in boost reading.

What RPM does this sputter happen? at idle if you unplug your MAF does it stay steady? You also need to adjust your idle to around 850rpms.

It also sounds like you need to do alittle bit of research to understand what the hell fuel pressure is, what air fuel ratio's are and how they correlate to your engine, and basic information about your car and how to work on it...

[Luiyi]

It's sputters around 4k rpms, then I release the pedal alil and it spools good.. And yes when I disconnect it the car sputters then shuts off

[cotbu]

You need a gauge on the return side of your fuel rail to see what PSI fuel pressure you are running. You cannot adjust fuel pressure without a PSI guage.

Actaully you need a gauge on the feed side or more specific before the regulator, Some are on the regulator therefore it's still before the return side, The return line is low pressure.
I like mine before the rail after the filter, just me!

[KiLLeR2001]

Originally Posted by cotbu

Actaully you need a gauge on the feed side or more specific before the regulator, Some are on the regulator therefore it's still before the return side, The return line is low pressure.
I like mine before the rail after the filter, just me!

This is correct. That's where I have mine as well.

[Luiyi]

whats a good gauge that i can put on?

[Luiyi]

i appreciate all the help guys..
ill probably post a video of how my car idles tomorrow

what else do u guys want to see on the video? maybe something u guys think is wrong

[Boost_Fiend]

What is your afr when you go WOT. The sputtering could just be from running to rich

[jr_ss]

Originally Posted by cotbu

Actaully you need a gauge on the feed side or more specific before the regulator, Some are on the regulator therefore it's still before the return side, The return line is low pressure.
I like mine before the rail after the filter, just me!

I know where he needs it. I have one on my regulator, which is the "return" line from the rail. But I should've specified for him.

[Luiyi]

My afr gauge reads 15.1+.. Idl if I should try to adjust the fpr myself...
This problem is driving me nuts-____-

What's the best gauge I can get for the return line


Can someone post a image of how it's suppose to look
Please

[Luiyi]

FRS

I found this on frsport.com
Should any of these work

[cotbu]

Originally Posted by jr_ss

I know where he needs it. I have one on my regulator, which is the "return" line from the rail. But I should've specified for him.

just bustin your balls

Originally Posted by Luiyi

My afr gauge reads 15.1+.. Idl if I should try to adjust the fpr myself...
This problem is driving me nuts-____-

What's the best gauge I can get for the return line


Can someone post a image of how it's suppose to look
Please

The best gauge for you would be an inline gauge before the rail after the filter, if you have a nismo type a. If you have the type b, you can put it just before the regulator or before the rail after filter.

Adjusting your regulator with out a gauge is considered testing, Get your favorite nail polish or marker draw a line on the adjusting bolt, down over the fpr top-hat. Make small adjustments then drive; to see if your theory is correct. If there aren't any changes, put it back.

Originally Posted by Luiyi

FRS

I found this on frsport.com
Should any of these work

Yes
Post that video...

[Luiyi]

Marshall 0-100 fuel pressure gauge



Noshock 0-160 fuel pressure gauge

Would any of these work?


And I will post video tomorrow

[cotbu]

The gauge should read 0-100psi and the inline T piece should fit the hose type you intend to use.

[Luiyi]

Feraure then I'll will buy one and put it on then I will try and adjust the fpr and see how it rides.. To me it feels likes to much gas is going through so that makes it sputter but idk

[Luiyi]

so here aRE SOME VIDEOS of my car showing you what problem it has hopefully u guys can help me out

car idling when i first start it
http://youtu.be/12pSj0LPpws

fuel pressure regulator
http://youtu.be/DRiLQXfWD10

car idling after warming up
http://youtu.be/uk7EHL3wZ_s

car doesnt throw any kind of smoke from exhaust
http://youtu.be/4BFIV2zuZqM

car sputters after 5k rpm
http://youtu.be/Lso_dgP8W7E

[Luiyi]

Bump i need help

[Luiyi]

Bump just posted some videos of my car look

[korco]

Bump I need to fix this problem it's driving me nuts

[KiLLeR2001]

Have you replaced your fuel filter? Is your FPR hooked up to a proper vacuum source in the throttle body? Did you spray carb cleaner or something equivalent to check for vacuum leaks?

You need a gauge to see what the fuel pressure is. That should be your top priority right now.

[jr_ss]

Trying anything that has been recommended is his top priority. The car isn't going to fix itself and we aren't going to hold your hand. Get and FSM and do some reading. Go out to said car, lift hood and start getting your hands dirty. You need to attempt something other than complaining about it and let us know what you find out after you attempt those things.