[V6-12v] Pinking under light throttle
thorp at spacia.org
Wed Aug 30 03:37:16 EDT 2006
On Aug 29, 2006, at 10:17 PM, Tom Christiansen wrote:
> Pinging happens when the fuel/air mixture is ignited at TDC of the
> piston. Reasons for why this could happen (my speculation).
> 1) Low octane fuel.
> 2) High compression (wonder what happens if coolant seeps into the
> cylinder through the cracked head gasket).
> 3) Crank sensor is getting sick. Can't sense TDC properly.
> 4) Incorrect fuel/air mixture I suppose. The knock sensor should take
> care of this.
> I believe both the crank and knock sensors will throw a trouble code
> if they become ill.
Check the ECU for fault codes. The ECU has measurement blocks for
knock counts and can switch between a couple timing maps. (At least
on my '95 A6) If the ECU isn't seeing the knock, then maybe the
sensors are bad.
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