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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series. |
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12-01-2011, 04:56 PM | #1 |
Leaky Injector
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bad fuel pressure regulator? just posted some vids for you guys
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
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Sideeways is the best Last edited by Luiyi; 12-03-2011 at 01:14 PM.. Reason: videos uploaded |
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12-01-2011, 05:05 PM | #3 |
Leaky Injector
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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
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Sideeways is the best Last edited by Luiyi; 12-01-2011 at 05:37 PM.. |
12-01-2011, 05:09 PM | #4 |
Leaky Injector
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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
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12-01-2011, 05:33 PM | #5 |
Zilvia FREAK!
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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
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12-01-2011, 05:40 PM | #6 |
Leaky Injector
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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?
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12-01-2011, 07:25 PM | #7 |
Post Whore!
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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...
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12-01-2011, 07:38 PM | #8 |
Leaky Injector
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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
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12-01-2011, 10:18 PM | #9 | |
Post Whore!
Join Date: Sep 2005
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Quote:
I like mine before the rail after the filter, just me!
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LoverTechnologies "Half Broken Things!" |
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12-01-2011, 10:38 PM | #10 |
Post Whore!
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This is correct. That's where I have mine as well.
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12-02-2011, 09:56 AM | #12 |
Leaky Injector
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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
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12-02-2011, 10:23 AM | #14 |
Post Whore!
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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.
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12-02-2011, 01:01 PM | #15 |
Leaky Injector
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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
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12-02-2011, 01:27 PM | #17 | |||
Post Whore!
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Quote:
Quote:
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. Quote:
Post that video...
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12-02-2011, 03:37 PM | #20 |
Leaky Injector
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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
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12-03-2011, 12:59 PM | #21 |
Leaky Injector
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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
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12-06-2011, 12:42 AM | #25 |
Post Whore!
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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.
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12-06-2011, 04:46 AM | #26 |
Post Whore!
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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.
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