Anyone one flashed back and had a problem at the dealer? (chirp chirp chirp)
 

It seems as though my 2015 with 750 miles has the "chirp chirp chirp" at idle after it gets warmed up.

Car is bone stock except for OFT. As you can imagine, I'm none too pleased since I thought this issue was supposed to have been fixed for MY2014.

With OFT your stock rom stored in tablet is 100% stock, jsut flash back to stock and take car in.

I don't think their has been a true fix to the fuel pump chirp yet.

take it your on 10% ethanol fuel ? that usually excites the crickets.

Yeah, now I feel like the stupid "search noob" and yes, on E10. The reputable places don't sell E0 91 octane.

I found the big thread after a google search so it would appear the chirping is normal? I'm kind of jumping around in the thread to read what's up.

As long as it's normal and not hurting anything, than I don't care. It just struck me as odd since it didn't start until today.

The chirps come and go, so don't just hang your head thinking it could be forever, in all likelihood it won't be.

If you run on E85 the additives in E85 generally kill the crickets :-)

http://www.ft86club.com/forums/showthread.php?t=67310



.

It's tempting!

But I'd really want a flex fuel sensor if I was going to do that so I didn't have to do the PITA procedure to switch maps since there is only a few gas stations in my area that sell E85.

At least you have it in your area, just fill up when you see one. Problem solved and extra power plus no knock everywhere.
It's also fun to do a detour in this car so any excise to go for drive is awesome really.

I mean, it's literally right off the highway on the way to work.

But I've also seen some stuff about having to run a tank of "normal" gas every so often to fight deposits? More internet hearsay?

I'm from the BMW/Miata world, so all this E85/direct injection stuff is still new to me.

I lost it when I read that. Good to know that may be part of the reason though. cant remember if I had the same chirp chirp when running 100% corn juice

Their appears to be some additive in E85 that suppresses (lubricates) crickets

However with 10% E fuels its maybe not added and crickets party.

I thought there was a new fuel pump part# and they would fix it for you? Could have sworn I read that on these boards

There is no fix for this, it's just the nature of the beast. Even if something makes it go away, it will just come back eventually.

Crickets are here to stay until FHI actually redesigns the high pressure pump. You can rectify it with a loud exhaust or a supercharger that whines like kids without napping. :D

The reason behind certain fuels helping the fuel pump not make that noise is not attributed to lubrication.

Check out VitViper's post about crickets:


http://www.mazdaspeedforums.org/foru...squeak-105223/

"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."