big time misfiring while not boosting - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ilikebooze · 05-05-2009, 01:35 PM

Howdy, I am having some issues with my s14 sr20det. I have tried some fixes, but to no avail. Basically, the power cuts out (misfires) when i am pressing in the throttle lightly. When it begins to cut, i just give it more gas til it hits boost, then i am fine.

I have done a boost leak test, changed the fuel filter and checked the plugs. What else do you think it could be? Thanks for help.

for future ref. of anyone who has this problem ... It was the ground on the top of the intake manifold. They came loose and created the problem. Insanely simple.

mkomar24 · 05-25-2009, 04:27 PM

Wow my Sr started doing this this morning as well. Seems like a boost leak but everything is good. Once it warms up it goes away and drives fine. WTF mate?

godsmack · 05-25-2009, 09:35 PM

def. something with the fuel. check fuel pressure and check to see if you have a leaky injector.

mkomar24 · 05-26-2009, 06:50 PM

Well it happened again and this time I quickly checked the wideband. I went from 14.7 afr to off the chart lean which to me suggests that fuel cut is happening. As soon as it cleared up I got on the throttle and made a clean pull to redline with a flat line going from 12.8 @2500rpm to 12.0 @redline. Seems like a MAF issue mabe?

S13_SideWayz · 05-26-2009, 07:11 PM

maf or fuel. check injectors. and fuel press.

ilikebooze · 06-10-2009, 01:41 PM

for future ref. of anyone who has this problem ... It was the ground on the top of the intake manifold. They came loose and created the problem. Insanely simple.

0wn3r · 06-10-2009, 02:15 PM

cleaning MAF as well.

ford_o · 06-10-2009, 06:48 PM

check your fuel tank to see if deposits are clogging up your fuel pump, just happened to me and i had drop the fuel tank clean it now its runs great!

SoguRacing · 06-10-2009, 07:07 PM

check your fuel pump. it could be surging or cutting out as demand increases for the injectors.

05-05-2009, 01:35 PM	#1
ilikebooze Leaky Injector Join Date: Jan 2009 Location: Mesa, AZ Age: 37 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	big time misfiring while not boosting Howdy, I am having some issues with my s14 sr20det. I have tried some fixes, but to no avail. Basically, the power cuts out (misfires) when i am pressing in the throttle lightly. When it begins to cut, i just give it more gas til it hits boost, then i am fine. I have done a boost leak test, changed the fuel filter and checked the plugs. What else do you think it could be? Thanks for help. for future ref. of anyone who has this problem ... It was the ground on the top of the intake manifold. They came loose and created the problem. Insanely simple. Last edited by ilikebooze; 06-12-2009 at 11:57 AM.. Reason: problem resolved

06-10-2009, 02:15 PM	#7
0wn3r Zilvia Addict Join Date: Oct 2007 Location: CT Posts: 676 Trader Rating: (4) Feedback Score: 4 reviews	cleaning MAF as well. __________________ 97 240sx se

06-10-2009, 07:07 PM	#9
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 39 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	check your fuel pump. it could be surging or cutting out as demand increases for the injectors. __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

05-25-2009, 04:27 PM	#2
mkomar24 Leaky Injector Join Date: May 2008 Location: St. Louis Posts: 97 Trader Rating: (5) Feedback Score: 5 reviews	Wow my Sr started doing this this morning as well. Seems like a boost leak but everything is good. Once it warms up it goes away and drives fine. WTF mate?

05-25-2009, 09:35 PM	#3
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 39 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	def. something with the fuel. check fuel pressure and check to see if you have a leaky injector.

05-26-2009, 06:50 PM	#4
mkomar24 Leaky Injector Join Date: May 2008 Location: St. Louis Posts: 97 Trader Rating: (5) Feedback Score: 5 reviews	Well it happened again and this time I quickly checked the wideband. I went from 14.7 afr to off the chart lean which to me suggests that fuel cut is happening. As soon as it cleared up I got on the throttle and made a clean pull to redline with a flat line going from 12.8 @2500rpm to 12.0 @redline. Seems like a MAF issue mabe?

05-26-2009, 07:11 PM	#5
S13_SideWayz Leaky Injector Join Date: Jan 2008 Location: FLA Age: 35 Posts: 140 Trader Rating: (0) Feedback Score: 0 reviews	maf or fuel. check injectors. and fuel press.

06-10-2009, 01:41 PM	#6
ilikebooze Leaky Injector Join Date: Jan 2009 Location: Mesa, AZ Age: 37 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	for future ref. of anyone who has this problem ... It was the ground on the top of the intake manifold. They came loose and created the problem. Insanely simple.

06-10-2009, 06:48 PM	#8
ford_o Banned from the Marketplace Join Date: Sep 2008 Location: woodbury Age: 35 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	check your fuel tank to see if deposits are clogging up your fuel pump, just happened to me and i had drop the fuel tank clean it now its runs great!