Engine knocking when about to stall?

[Hatch]

Just curious what the knocking sound is when you are close to stalling the car. Im sure everyone knows that I am talking about, i just cant seam to pinpoint what it is.

Id assume its not good

Jeff

[Flashmn]

engine rpm drops so much that it starts to shake.

[Hatch]

but what is creating the knocking sound? is it in injectors, or the spark?

[SmokingTires]

If your stalling your car.... you shouldn't really be worried about why it's knocking. More why your stalling it

[Hatch]

ok obviously noone knows - no i dont stall my car, but as with everyone, i dont care how pro star you are, late at night comin home from the gf's or whatever, let off the clutch a little to fast w/o enough gas and it knocks a little and then gets going.

[alltrac165]

Hard to say, really. I've only really experienced what Flashmn said. RPM is so low that the engine shakes and makes the whole car rattle.
If you have a genuine knocking, it could be detonation. Or it could be that the burning mixture is building too much pressure too early and hammering the rod bearings. Either way, avoid it

[Flashmn]

well obviously when the rpm goes so down that it shakes, the pistons etc rattle and timing is way off.