SR is misfiring hard and sputtering under boost need help ASAP! - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

stephens14sr · 09-28-2012, 01:30 PM

i had the same problem recently. got a new fuel pump, redid the timing, and got new plugs and gapped them down to .021 now it runs great.

Jesse SR20 · 09-29-2012, 02:12 PM

Are you sure it's not a boost leak ? It certainly sounds like one.

You say there isn't a leak, but how did you test for one ? Did you pressure test it, or just look at it ? You can't visually inspect for boost leaks.

Midnight Shift · 10-09-2012, 07:46 AM

SORRY for reviving a thread that was a few months old! I had the SAME thing happen to my car for over a year, I couldn't figure out what it was. I then had an engine knock so bad, that I replaced my SR.

Even with the new engine, when I would get into boost, it felt like it wasn't getting enough fuel, or like a boost leak. so I did boost leak tests, tried different MAFS, TPS, Coils, etc! I even changed the fuel pump! Recently it was getting really bad, especially on a not-so-smooth road! It would sputter and almost die out on me!

My friend told me he had the same problem about a year ago. What it turned out being was the ground on the fuel pump. I wasn't being grounded well enough caused it to not allow the fuel pump to run at full capacity! So, I just sliced in a wire and grounded it straight to the chassis, and my car was boosting and running like it's never run before!!!!! Try it out! It is the Black/white wire in your trunk that leads to the fuel pump!

So, 1 wire cost me a new fuel pump, and an engine swap!

Apparently, this can be a little bit common on S13s (I have a coupe!) So, give it a try, it can't hurt to do so!

Selivince · 02-23-2019, 08:21 AM

Hi, just wondering if this Problem ever got solved? As I'm having the Exact problem on my S14

ultimateirving · 02-23-2019, 09:21 AM

Quote:

Originally Posted by Selivince

Hi, just wondering if this Problem ever got solved? As I'm having the Exact problem on my S14

Coil packs, spark plugs and gap size or fuel pump. These seem to be the common culprits. What have you tried ?

jedi03 · 02-25-2019, 08:25 AM

really sounds like boost leak to me...had hose pop off goin onto the freeway and acted like this...no boost, could accelerate just fine...hit boost, sputtering drop in power etc...

09-28-2012, 01:30 PM	#31
stephens14sr Zilvia Junkie Join Date: Mar 2011 Location: TEXAS Age: 34 Posts: 305 Trader Rating: (0) Feedback Score: 0 reviews	i had the same problem recently. got a new fuel pump, redid the timing, and got new plugs and gapped them down to .021 now it runs great. __________________ Full 2014 build progress www.handicapmafia.wordpress.com

09-29-2012, 02:12 PM	#32
Jesse SR20 Join Date: Nov 2007 Location: Rancho Santa Margarita CA Age: 43 Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	Are you sure it's not a boost leak ? It certainly sounds like one. You say there isn't a leak, but how did you test for one ? Did you pressure test it, or just look at it ? You can't visually inspect for boost leaks. __________________

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10-09-2012, 07:46 AM	#33
Midnight Shift Leaky Injector Join Date: Mar 2012 Location: Neverland, Japan Posts: 51 Trader Rating: (3) Feedback Score: 3 reviews	SORRY for reviving a thread that was a few months old! I had the SAME thing happen to my car for over a year, I couldn't figure out what it was. I then had an engine knock so bad, that I replaced my SR. Even with the new engine, when I would get into boost, it felt like it wasn't getting enough fuel, or like a boost leak. so I did boost leak tests, tried different MAFS, TPS, Coils, etc! I even changed the fuel pump! Recently it was getting really bad, especially on a not-so-smooth road! It would sputter and almost die out on me! My friend told me he had the same problem about a year ago. What it turned out being was the ground on the fuel pump. I wasn't being grounded well enough caused it to not allow the fuel pump to run at full capacity! So, I just sliced in a wire and grounded it straight to the chassis, and my car was boosting and running like it's never run before!!!!! Try it out! It is the Black/white wire in your trunk that leads to the fuel pump! So, 1 wire cost me a new fuel pump, and an engine swap! Apparently, this can be a little bit common on S13s (I have a coupe!) So, give it a try, it can't hurt to do so!

02-23-2019, 08:21 AM	#34
Selivince Join Date: Feb 2019 Location: Australia Age: 27 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	Hi, just wondering if this Problem ever got solved? As I'm having the Exact problem on my S14

02-25-2019, 08:25 AM	#36
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,784 Trader Rating: (8) Feedback Score: 8 reviews	really sounds like boost leak to me...had hose pop off goin onto the freeway and acted like this...no boost, could accelerate just fine...hit boost, sputtering drop in power etc...