ZR-1 Net Registry Forums - View Single Post - 90' Intermittent power

RSLyrick · 03-06-2025

Understood, let's see if more people can advise on your issue. Otherwise, Marc is your best shot.

However, I'm wondering how a faulty ECM could lead to such erratic ignition behaviour...To my understanding the ECM is using a single wire to trigger coils with specific timing advance / retard. How could only cylinder #5 ignition control fail ? And assuming that this is the case, cylinder #8 would also fail.

Bad coil seems like a more resonable explanation (manufacturing issue, bad contact on side #5 ?).

When a single cylinder is affected I would target parts that drive a single cylinder (spark plug, spark plug wires, injector).

That tickles my mind...I'm very curious about what's wrong with your Z.

Did Marc say something about the air leak sound ?

03-06-2025	#4
RSLyrick Join Date: Oct 2023 Location: Germany Posts: 45	Re: 90' Intermittent power - Spark problem Understood, let's see if more people can advise on your issue. Otherwise, Marc is your best shot. However, I'm wondering how a faulty ECM could lead to such erratic ignition behaviour...To my understanding the ECM is using a single wire to trigger coils with specific timing advance / retard. How could only cylinder #5 ignition control fail ? And assuming that this is the case, cylinder #8 would also fail. Bad coil seems like a more resonable explanation (manufacturing issue, bad contact on side #5 ?). When a single cylinder is affected I would target parts that drive a single cylinder (spark plug, spark plug wires, injector). That tickles my mind...I'm very curious about what's wrong with your Z. Did Marc say something about the air leak sound ?