Pre-ignition

[r2uzenblot]

I've been suffering a bit from pre ignition when pulling away to such an extent that it is going into the dealer for a check. Most noticeable at cold and as I drive 90% of the time with the top down I can always hear it. Most of my driving is relatively local so I use the nearby Shell garage to fill up but recently had to use Esso and suddenly it was much improved, not totally cured but much better. Am I imaging things or is there some possible logic in this?

[B21]

Seems inconceivable without a major DME fault or associated sensor issue..

The DME and sensors on that engine are so sophisticated seems implausible.

[Rockhopper]

Sure it’s not a rattling heat shield? Pinking is almost impossible on a modern car with knock sensors and if one of those had failed you’d get a light on or at least a code stored. Have you read the codes?

[ori]

Seconded about maybe a rattle of some kind as it’s really unlikely to be pinking. There would be error messages up as well check engine light.

Let us know what dealer finds though.

[Sladester100]

Potentially whilst a different issue this could link to a PuMA I just learned about that is a DME fault.

See my reply in the stuttering thread; viewtopic.php?p=1927106#p1927106

[r2uzenblot]

Well my car was reported as nothing showed up...... I've asked for a call back from the service manager as it hasn't gone away at all. Now I drive with the top down 98% of the time I can hear 'pinking' under load until the engine really warms up.