Code 34 Knock sensor issues - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Davidna2fi · 09-20-2013, 05:52 PM

Nope, nissan ECU needs the knock sensor signal so adjust timing depending on load so it reduces knock or elimates it. I would double check the ignition timing settings first, possible that the engine is really detonating a lot if its' too far advanced. Does it seems really sluggish before it gets into boost, or takes too long to spool? Could be signs of timing issue. Also slight bucking without boost also can indicate timing issue. But if you step into it and it goes like a bat out of hell, more than likely the timing is really advanced beyond what the factory ECU can compensate for. Search for timing check, it's not as simple as you think, Nissan has a trick so that the ECU will lock in the base timing so it can be seen, you can't just stick a light on and then it shows correctly. By all the things you've done, it's nothing to do with the knock sensor circuit since it happens when driving a certain way. If it was circuit or sensor issue it would happen regardless of driving cylce.

09-20-2013, 05:52 PM	#2
Davidna2fi Zilvia Junkie Join Date: May 2008 Location: Houston, TX Posts: 513 Trader Rating: (18) Feedback Score: 18 reviews	Nope, nissan ECU needs the knock sensor signal so adjust timing depending on load so it reduces knock or elimates it. I would double check the ignition timing settings first, possible that the engine is really detonating a lot if its' too far advanced. Does it seems really sluggish before it gets into boost, or takes too long to spool? Could be signs of timing issue. Also slight bucking without boost also can indicate timing issue. But if you step into it and it goes like a bat out of hell, more than likely the timing is really advanced beyond what the factory ECU can compensate for. Search for timing check, it's not as simple as you think, Nissan has a trick so that the ECU will lock in the base timing so it can be seen, you can't just stick a light on and then it shows correctly. By all the things you've done, it's nothing to do with the knock sensor circuit since it happens when driving a certain way. If it was circuit or sensor issue it would happen regardless of driving cylce.