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View Full Version : Engine's Knocking....


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EclipseGST
09-26-2005, 03:55 PM
phantom knock doesn't exist.

So if that is the case... What do you call lifter tick that gets picked up by the knock sensor even though the engine is not knocking?

desolate
09-26-2005, 04:07 PM
That would be phantom knock. Technically what causes that noise are from the lifters that is picked up by the knock sensor. I believe what he's trying to say is the knock sensor would not just recieve noise from nothing. Although in my past experience I drove a 92gsx with horrible lifters. At the time I was logging the car and found out that even though the noise from the lifters was loud, I wasn't getting any 'phantom knock'. Strange, but it must be different car to car.

niterydr
09-26-2005, 04:39 PM
So if that is the case... What do you call lifter tick that gets picked up by the knock sensor even though the engine is not knocking?

I would call that lifter tick, therefore sending a knock signal to the knock sensor. "knock" can never be phantom, the ecu is hearing something. Just dismissing it as 'I know that is lifter tick, or an axle tapping on the block, or etc.." without fixing it, will cause you to melt your shit someday when it actually is knocking and you dismissed it as 'phantom'.
Noise is different, just because it is audible, doesn't mean the knock sensor picks it up, just fyi.

1slowdsm
09-26-2005, 07:19 PM
I'll go check my timing this weekend at my cousin's. Then adjust the timing and see if I still get the same results.
It sometimes knocks when I'm in first gear and slowly climbing up the RPMs.
It only knocks when I'm underload.
On the MMCD program it seems to knock mostly when the TIMA is under 30 Degrees, does that seem right? Its like less timing advance=more chance of knock...:/
Sorry if I'm not giving enough information here, but I know very little about knock and what causes it. I'm trying my best.

CDeutsch
09-26-2005, 10:02 PM
You should do some research on knock for your own reference, but to answer your question, more timing generally increases the chances for knock. Decreasing the timing and/or boost decreases it as does lowering the intake temp or increasing the octane.

Oh and 60 degrees of timing advance is insane under load are you sure you (or the software) are reading that right?

1slowdsm
09-27-2005, 08:22 AM
Oh and 60 degrees of timing advance is insane under load are you sure you (or the software) are reading that right?

Well...I was looking at the TIMA on the MMCD software. I'll log it on the way to school and see how it goes.

94talonawd
09-27-2005, 08:30 AM
it seems lke you havee timing issues. when your under load your timing advances and since base timing is already advance, its casing your engine to knock and retard timing. so i would definitly check your base timing.