Hey, my son bought a 2011 XR6 Turbo ute approximately 6 mths ago, and until now its been running VERY well. It has CAI, after market intercooler (http://www.ebay.com.au/itm/HDI-HYBRI...UAAOSwnDxUhqIl) and a tune. As I said it has been running fine, but out of the blue it now is idling low, quite rough and rattly, and the engine light is on. Raise the idle via the pedal, all noises and roughness disappear. When its driven, a weird induction noise comes in with a noticeable drop in power, yet the boost gauge still operates normally. Had it at a supposedly reputable workshop today, thinking a scan tool may help but nothing was found. Hoping someone here may be able to offer some suggestions.

engine light on and no fault codes? weird, all I can suggest is how old are the ignition coils?

 

could be alot of things without more information, maybe somebody else will come up with something.

I have rechecked with the workshop, now they said "OH yes there are codes, but they make no sense". These are the codes in order as they showed on the scanner:

 

P0420

P1381

P1383

P1386

P1388

Lots of timing codes there. No expert but I'd be checking timing , if you have covered the basics.

Sounds to me like a classic case of timing chain has jumped a tooth or two, a quick removal of the rocker cover & you could confirm if that's the case, & if it has jumped have a good look at the Cain guides, cos they can break & aid in the chain flapping around & that's probably the noise you can hear.. it's not a big deal so don't panic about it as you only have to drop one of the cam phases off, jump it back to where it should be & replace any broken guides ( hopefully it's only the top one ) cos it's very accessible, rocker cover back on & should be fine .. good news is the won't bend the valves on those engine's.. anyway good luck with it & let us know what you find..

 

DJP.