Quote:
Originally Posted by xjohnx
Are you sure it's not the HPFP? i know mine can be a kind of loud at partial throttle(50-60%), moderate load in the 3-4k rpm range.
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I'm not 100% sure, no, and my HPFP is moderately noisy. The thing that makes me think it's the ECU is how it tips in/tips out depending on load and engine speed. E.g. on the over-run it goes very quiet where very small amounts of fuel are being injected, and then once it gets to 1200rpm or so it goes loud again, which is typically where the over-run fuel cut-off has now started to put fuel back in to stop the engine stalling.
I'll have to get a passenger to stick a stethoscope on it to confirm.