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You could do a quick OBD scan to see if there's any fault present...
But more likely it was the too low of RPM and the ECU trying to build boost through excessive fuel delivery.

It's something I would not be worried about unless you had the same instance again.

- Erik

 

Had the exact thing happen to me a month or so ago and it hasn't happened again. No codes stored. I am in a modified MCS.

 

Bad gas

 

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My car did the same thing running shell.

 

While I won't dispute the idea of bad gas, I have only purchased 93 octane from a high volume Mobil station and I have never come across a tank of bad fuel. I have about 12,000 miles on the car and experienced superknock once around 4,000 miles. Superknock occurs at high throttle angle low RPM and is easy enough to avoid by keeping your RPM's where the car likes them (above 2,200).

Bad gas is easy and very possible but I just think that's an easy answer. No codes were thrown though...so it's hard to say. When I experienced the superknock, there was no engine light but a recordable code that was read and cleared. Overall, I am surprised that so many cars experience this condition. Sort of disspointing considering this is cutting edge engine management/electronics.

I still say...give me a mechanical setup anyday

 

ive had this same problem a few times but mine has the RMW tune. i think for me it was bad gas. sorry i can't give any help. i have never had it on the stock tune but it does seem to be common.

 

Louise is not a 2009 JCW but a highly modded 2007 JCW. Just dropped off Louise today for a similar problem. With the RMW tune I've been having problems with slow boosting at low RPM and then getting the 1/2 engine symbol. Never any stored codes. I would just reset the ECU and then drive around the problem; no heavy throttle at low RPM and ease into the throttle at high RPM.

I've replaced all sensors I can get to which included both O2, MAP, MAF and air inlet temp. I also replaced the diverter valve twice as the AUDI one sucked.

I've pressure checked the intake system, post turbo to the head, at 21 PSIg, for leaks and none.

I've also had the high pressure fuel pump (HPFP) replace under warranty.

Over the past two weeks the problem has presented itself more often and now with the JCW tune. Now that it appears with the JCW tune the dealer can diagnose and fix it.

Putting this all to paper now makes me think it's a fuel problem, maybe the HPFP again.

It's a time of reckoning for this elusive gremlin.......