My 240 with sr20det is only firing on 2 cylinders :(

[phroze2001]

I installed an sr20det into a 1990 240sx ive got everything done, i went to start it and it started up rough i pulled the packs off and tested spark and only cylinder 1 and 2 are firing 3 and 4 are dead i first tried swapping coil packs with one that worked and nothing. I then tested the packs for ignition on 12 volt power and they are all getting power i tested them where they get the signal from the ignitor and they were all getting low voltage when cranking the engine over but the 2 that wont fire are getting higher voltages than the 2 that fire. Any help would be greatly appreciated.

[InsanityInc]

Have you done a compression test, or checked the injectors?

You need compression, fuel and spark to make a cylinder fire. You've checked one, now check the others.

[phroze2001]

The back 2 arent getting spark at all

[phroze2001]

To the top for my non running car

[slow s13]

double check your wiring, if your shure its ok. check the ignitor per fsm, and if you extended those wires check them too, then onto using a different ecu.

[phroze2001]

Would the ignitor stop just two coil packs from giving spark? How should I check the ignitor? Voltmeter? If so what sort of voltage should i see when cranking it over?

[phroze2001]

echo echo echo

[got_boost702]

the ignitor will stop just 2 cylinders from firing. This recently happened to me, the ignitor was causing the 3rd cylinder not to fire in my redtop. I dont know how to troubleshoot the ignitor, i would just go to a parts store/junkyard and pickup one of a q45 or which ever one you have on there.

[phroze2001]

Right on thanks man ,you have instilled hope into my dream lol I just purchased one and am waiting on it to arrive.

[boost_creep]

i ahd this same promlem a couple months ago...i unplugged the ignitor to check the wiring(both sides)..and when i plugged it back in the car ran fine...did u try this?

[phroze2001]

I didnt mean to check it like that but yea i pulled the igniter off and checked voltage going to it and plugged it back in and tried it one more time and still notta.

[phroze2001]

Still waiting on my ignitor shipping from Japan takes forever so I sure hope that was the problem

[phroze2001]

Runs great now, it was the ignitor

[slow s13]

great news