S14 misfire - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

robmontoya11 · 01-19-2017, 10:30 PM

Someone please help I have been going at this for weeks!!! I have a misfire in which it ideales rough and makes muffled popping noises when idling as if it's not getting spark or has fuel cuts. It also loses a good amount of top end power and sometimes makes a nasty noise that sounds like it's leaning out hard. I have replaced fuel filter, have a Walbro 255 fuel pump, MAF, distributor with cap and rotor, spark plugs, injectors, air filter, added engine ground, replaced oil, and adjusted idle. I went to get an OBD scan and I got 3 codes: EGR(removed), speed sensor, and some air sensor for this car but when I looked that code up online, nothing popped up. I am led to believe the only things left that may fix the issue are TPS, Bad wiring harness or ECU. Someone please provide further input I would greatly appreciate it.

Nissan2nr22 · 01-20-2017, 07:52 AM

What about the cables and coilpacks?

Check/clean those out, electrical grease etc.

jedi03 · 01-20-2017, 08:10 AM

double check timing too

robmontoya11 · 01-20-2017, 09:26 AM

I already checked timing it's on point

EDT007 · 01-20-2017, 10:43 AM

I can only assume that it's a KA since you didn't specify. It would help if you actually listed the P-codes you received from the OBD scanner. What year is the car?

robmontoya11 · 01-20-2017, 02:35 PM

Just went to Autozone, the codes are p0110 Intake air temp sensor, p0500 speed sensor, P0325 Knock sensor, most likely activated by solid mounts or misfire, p1605 A/T diagnostics communication line( converted to manual), and P1400 EGR(removed)

01-19-2017, 10:30 PM	#1
robmontoya11 Join Date: Oct 2015 Location: Miami Age: 27 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	S14 misfire Someone please help I have been going at this for weeks!!! I have a misfire in which it ideales rough and makes muffled popping noises when idling as if it's not getting spark or has fuel cuts. It also loses a good amount of top end power and sometimes makes a nasty noise that sounds like it's leaning out hard. I have replaced fuel filter, have a Walbro 255 fuel pump, MAF, distributor with cap and rotor, spark plugs, injectors, air filter, added engine ground, replaced oil, and adjusted idle. I went to get an OBD scan and I got 3 codes: EGR(removed), speed sensor, and some air sensor for this car but when I looked that code up online, nothing popped up. I am led to believe the only things left that may fix the issue are TPS, Bad wiring harness or ECU. Someone please provide further input I would greatly appreciate it.

01-20-2017, 10:43 AM	#5
EDT007 Zilvia Addict Join Date: Feb 2008 Location: NJ Age: 42 Posts: 617 Trader Rating: (8) Feedback Score: 8 reviews	I can only assume that it's a KA since you didn't specify. It would help if you actually listed the P-codes you received from the OBD scanner. What year is the car? __________________ 97' 240SX - "lightly modified" - Weekend fun 08' IS250 - Daily 05' ZX6R - Twisties

01-20-2017, 07:52 AM	#2
Nissan2nr22 Nissanaholic! Join Date: Aug 2008 Location: USA Posts: 1,627 Trader Rating: (30) Rides Gallery: Nissan2nr22 Feedback Score: 30 reviews	What about the cables and coilpacks? Check/clean those out, electrical grease etc.

01-20-2017, 08:10 AM	#3
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,836 Trader Rating: (8) Feedback Score: 8 reviews	double check timing too

01-20-2017, 09:26 AM	#4
robmontoya11 Join Date: Oct 2015 Location: Miami Age: 27 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	I already checked timing it's on point

01-20-2017, 02:35 PM	#6
robmontoya11 Join Date: Oct 2015 Location: Miami Age: 27 Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	Just went to Autozone, the codes are p0110 Intake air temp sensor, p0500 speed sensor, P0325 Knock sensor, most likely activated by solid mounts or misfire, p1605 A/T diagnostics communication line( converted to manual), and P1400 EGR(removed)