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Update on the 'knock and ping'.

When the engine is just warm enough the mystery ping doesn't appear. Once the car has reached it's maximum operating temp it appears. I even took a whole lot of fuel out of the 4000rpm to top end to give it a try and bingo a massive increase in power all the way to 6000+rpm.

The fault also makes itself known at lower rpms when the accellerator is quickly stomped on. Usually the fuel map has a 'throttle pump' extra squirt of fuel when you do this.

I was wondering if the cold start solenoid on the plenum is compensating for an injector that is partially blocked?

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