Quote:
Originally Posted by Davidna2fi
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.
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I'm not running boost, it's n/a. It's 20 degrees BTDC at idle like it should be, but when I giving throttle the timing seemed to advance very inconstant and didn't seem right when I let off throttle. I'm no master with timing or a timing light. I do have a noise in the head somewhere, could be timing chain guide. The upper guide that's on the head under the valve cover broke while I was driving one day, and was getting thrown around by the cams. Could that have possible damaged something and causing that noise?
My car sat for about 8 hours and I started it, let it idle until operating temperature, and it drove home flawlessly, and the CEL didn't come on once. But when I got to my house I turned it off and started it again, and the CEL came on. I looked at all my plugs and they seem to be fine, gapped to spec, etc. I use premium gas so I'm doubting that it's an actual detonation knock.
Maybe my ecu is tripping out? Still stumped. Sometimes when I try to check the codes my ecu won't throw any. Not even a 55 (all systems go) or 34, what it normally throws. Almost everything is new. Maybe I have a short or bad ground somewhere?
Thanks for the reply