Octane 91 causes SR to knock...eventually? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dongoesby · 01-29-2010, 12:54 AM

I remember seeing a topic like this before, but I couldn't find it anywhere.

So stock sr20 is meant to run oct 93 in japan, will 91 causes the motor to knock in some level with stock management?

my s14 sr20 is throwing a 34 knock code and I've used the 24-hour-battery-kill method to clear codes, and the 34 shows up again as soon as i started the engine. Clear the code again and made sure I got code 55, then started the engine, and I got 34 again.

I suppose the motor should run rich while cranking to start, which the stock ecu sends signal to dump more fuel while cranking. And more fuel at cranking means rich. Is it possible or how likely to get a knock signal from just starting the engine? Am I really receiving a knock signal or possibly bad sensor/wire?

01-29-2010, 12:54 AM	#1
dongoesby Zilvia Addict Join Date: Mar 2007 Location: San Francisco Age: 38 Posts: 756 Trader Rating: (17) Feedback Score: 17 reviews	Octane 91 causes SR to knock...eventually? I remember seeing a topic like this before, but I couldn't find it anywhere. So stock sr20 is meant to run oct 93 in japan, will 91 causes the motor to knock in some level with stock management? my s14 sr20 is throwing a 34 knock code and I've used the 24-hour-battery-kill method to clear codes, and the 34 shows up again as soon as i started the engine. Clear the code again and made sure I got code 55, then started the engine, and I got 34 again. I suppose the motor should run rich while cranking to start, which the stock ecu sends signal to dump more fuel while cranking. And more fuel at cranking means rich. Is it possible or how likely to get a knock signal from just starting the engine? Am I really receiving a knock signal or possibly bad sensor/wire?