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View Full Version : One plug sparks on SR

JacobT
11-05-2009, 09:32 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, 09:51 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, 09:56 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, 10:03 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, 10:06 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, 10:10 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?

Try a different ECU.
chituntang
11-06-2009, 02:30 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, 11:43 AM
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, 12:46 PM
same thing happen to my bro car, swap out the ecu and fire right up.
s13_sr20det
11-06-2009, 01:23 PM
check out your ignitor chip. swap it out with a known good one. that might do it.
JacobT
11-07-2009, 10:36 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, 10:47 PM
sometimes things just go bad man, just bad luck... if a freind has one try that(if you dare) lol....