One plug sparks on SR - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JacobT · 11-05-2009, 10:32 PM

Hey guys, only one of my spark plugs works right now. The one closest to the firewall works, all the other three don't spark. I swapped out the coils and they're all fine. I checked the grounds on the back of the motor, took out the screw, sanded the area and put them back on, still nothing.

Not sure as to why the first three aren't firing. Everything is plugged in correctly, looks all good. Can I somehow ground them individually and see if that works?

SidewayZ-s14 · 11-05-2009, 10:51 PM

My buddy and I just had this same exact problem, and i mean SAME EXACT problem.
We just about tried EVERYTHING!

ECU was bad.
Got a new ECU and everything is prefect! :]

JacobT · 11-05-2009, 10:56 PM

How could have my ECU have went?

The car ran perfect prior to this, pulled the motor, put new one in.

om3ga · 11-05-2009, 11:03 PM

Did you use your old harness? If by chance you want a brand new harness or need yours repaired pm me.

JacobT · 11-05-2009, 11:06 PM

Ya I reused the old one.

First I need to figure out whats wrong before I start replacing parts.

How can I check if my ECU is jacked?

SidewayZ-s14 · 11-05-2009, 11:10 PM

Quote:

Originally Posted by JacobT

Ya I reused the old one.

First I need to figure out whats wrong before I start replacing parts.

How can I check if my ECU is jacked?

Try a different ECU.

chituntang · 11-06-2009, 03:30 AM

It is easy to mess up the ecu, ie pulling it out without cutting the power off the car.

It may not happen the first day, but they are electronic, they will go bad one day.

JacobT · 11-06-2009, 12:43 PM

The ECU was never pulled and the battery was taken out before I touched anything in the engine bay.

Last night the car fired up for a few seconds then died out.

When I first checked for spark it was really weak except for cyl 4. Now only #4 fires.

Bowbasaur · 11-06-2009, 01:46 PM

same thing happen to my bro car, swap out the ecu and fire right up.

s13_sr20det · 11-06-2009, 02:23 PM

check out your ignitor chip. swap it out with a known good one. that might do it.

JacobT · 11-07-2009, 11:36 PM

Swapped out the ignitor and nothing happened.

I'll be taking out the ECU and inspecting it. I'm baffled as to how it just magically went "bad".

*Ceepo* · 11-07-2009, 11:47 PM

sometimes things just go bad man, just bad luck... if a freind has one try that(if you dare) lol....

11-05-2009, 10:32 PM	#1
JacobT Leaky Injector Join Date: Jun 2006 Location: Windsor, Canada Age: 21 Posts: 61 Trader Rating: (3)	One plug sparks on SR Hey guys, only one of my spark plugs works right now. The one closest to the firewall works, all the other three don't spark. I swapped out the coils and they're all fine. I checked the grounds on the back of the motor, took out the screw, sanded the area and put them back on, still nothing. Not sure as to why the first three aren't firing. Everything is plugged in correctly, looks all good. Can I somehow ground them individually and see if that works? __________________ 1995 Nissan 240SX

11-05-2009, 10:56 PM	#3
JacobT Leaky Injector Join Date: Jun 2006 Location: Windsor, Canada Age: 21 Posts: 61 Trader Rating: (3)	How could have my ECU have went? The car ran perfect prior to this, pulled the motor, put new one in. __________________ 1995 Nissan 240SX

11-05-2009, 11:06 PM	#5
JacobT Leaky Injector Join Date: Jun 2006 Location: Windsor, Canada Age: 21 Posts: 61 Trader Rating: (3)	Ya I reused the old one. First I need to figure out whats wrong before I start replacing parts. How can I check if my ECU is jacked? __________________ 1995 Nissan 240SX

11-06-2009, 12:43 PM	#8
JacobT Leaky Injector Join Date: Jun 2006 Location: Windsor, Canada Age: 21 Posts: 61 Trader Rating: (3)	The ECU was never pulled and the battery was taken out before I touched anything in the engine bay. Last night the car fired up for a few seconds then died out. When I first checked for spark it was really weak except for cyl 4. Now only #4 fires. __________________ 1995 Nissan 240SX

11-07-2009, 11:36 PM	#11
JacobT Leaky Injector Join Date: Jun 2006 Location: Windsor, Canada Age: 21 Posts: 61 Trader Rating: (3)	Swapped out the ignitor and nothing happened. I'll be taking out the ECU and inspecting it. I'm baffled as to how it just magically went "bad". __________________ 1995 Nissan 240SX

11-05-2009, 10:51 PM	#2
SidewayZ-s14 BANNED Join Date: Nov 2007 Location: SoCal 714 Posts: 1,062 Trader Rating: (14)	My buddy and I just had this same exact problem, and i mean SAME EXACT problem. We just about tried EVERYTHING! ECU was bad. Got a new ECU and everything is prefect! :]

11-05-2009, 11:03 PM	#4
om3ga Zilvia Junkie Join Date: Jan 2007 Location: Up and Down! California Posts: 342 Trader Rating: (1)	Did you use your old harness? If by chance you want a brand new harness or need yours repaired pm me.

11-06-2009, 03:30 AM	#7
chituntang Zilvia Member Join Date: Sep 2005 Location: ATL Age: 23 Posts: 271 Trader Rating: (3)	It is easy to mess up the ecu, ie pulling it out without cutting the power off the car. It may not happen the first day, but they are electronic, they will go bad one day.

11-06-2009, 01:46 PM	#9
Bowbasaur Leaky Injector Join Date: Jan 2007 Location: Pomona Posts: 113 Trader Rating: (2)	same thing happen to my bro car, swap out the ecu and fire right up.

11-06-2009, 02:23 PM	#10
s13_sr20det Join Date: Dec 2007 Location: Elizabeth Posts: 20 Trader Rating: (0)	check out your ignitor chip. swap it out with a known good one. that might do it.

11-07-2009, 11:47 PM	#12
Ceepo Premium Member Join Date: Jan 2008 Location: Cedar City, Utah Posts: 1,239 Trader Rating: (6) Rides Gallery: Ceepo	sometimes things just go bad man, just bad luck... if a freind has one try that(if you dare) lol.... __________________ 1995 240sx SE (current)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Sponsored Links