Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - Small Questions Thread (SEARCH FIRST! Use this instead of making NEW threads)

DJTTon · 11-04-2020, 05:30 PM

Hi gang,
Ive been troubleshooting an intermittent misfire issue on my S14 SR, and wanted to ask for some guidance. The issue is on cylinder 3 and I have determined the coilpack, spark plug and injector to be fine by swapping components between cylinders.

One additional check Ill be performing tmrw is visually verifying spark by taking the spark plug out and grounding it while cranking with no fuel pump.

Whats interesting is that when I crank the engine to start the SR runs on all 4 cylinders and after a couple seconds you can hear the cylinder drop out, and once in a while itll come back.

IF there is spark on that cylinder, could it be possible that something is wrong with cylinder 3 valvetrain components like rocker or shims or guide or lifter? If so, what could it be?

11-04-2020, 05:30 PM	#23508
DJTTon Zilvia Addict Join Date: Nov 2015 Location: Where the bad guys are Posts: 886 Trader Rating: (6)	Hi gang, Ive been troubleshooting an intermittent misfire issue on my S14 SR, and wanted to ask for some guidance. The issue is on cylinder 3 and I have determined the coilpack, spark plug and injector to be fine by swapping components between cylinders. One additional check Ill be performing tmrw is visually verifying spark by taking the spark plug out and grounding it while cranking with no fuel pump. Whats interesting is that when I crank the engine to start the SR runs on all 4 cylinders and after a couple seconds you can hear the cylinder drop out, and once in a while itll come back. IF there is spark on that cylinder, could it be possible that something is wrong with cylinder 3 valvetrain components like rocker or shims or guide or lifter? If so, what could it be? __________________ Skurr Skurr