[Koa]

Originally Posted by keithr

Quoth the service department, yes. They've already replaced it once and when the problem returned, service adviser asked if I would mind waiting until they were sure the next revision was actually going to fix the problem. Otherwise, they could replace the pump again and it would only be a matter of time until the problem came back again. I said I could live with it until they figured out the true fix. It's a left-knob problem.

Spoke to the guy a couple weeks back and he said he's been in contact with the field reps and working on getting final word on the newest revision, which I believe is revision 4.

here's a tip for you:

It's an inherent characteristic of an unshielded HPFP running at a target idle pressure of 4MPa. What you think is a "problem" is not a "problem" that causes damage.
@VitViper once posted this:

My work on the MS3 platform with the chirp/crickets under the hood.

If you take some time to datalog the twins and use some basic troubleshooting (check off the fact that it's a brand new car with less than 1k miles so the likelihood for a mechanical problem/bad HPFP is basically NIL), start looking into the software and note how the system operates.

Anywhere from 650 rpm to ~1300 rpm I can hear the chirp, and when it's chirping the ECU is in a mode that's targeting 4 MPa of fuel pressure (fixed setting). If you touch the throttle just enough to leave that mode and enter the normal pressure target "mode" (the ECU appears to operate in two modes, one when you're on the throttle, one when you're not), even with the revs in that same range, no chirp. And you'll also note a difference in fuel pressure target and actual fuel pressure.

Doesn't take a rocket scientist to put together.

Unfortunately I have not yet found the perfect solution to keep the ECU from going into this mode. I'm an ECUTek dealer so I need to have a chat with those "chaps" across the pond about this. There is a table in the ECU that is 2x2 and targets 4.0MPa, but it seems to do nothing for our idle issue, it's never used (tried changing it up and down).

Another thing that would be interesting to see is if our PRV is straight mechanical or some kind of electronically controlled unit -- I seem to think electronically as we have a huge range of fuel pressure operation (all the way to 20mpa, ~2900psi. Almost 2x higher than the MS3 platform). Just the way everything behaves leads me to believe it is electronic... but I haven't had the time to look yet.