Miata Turbo Forum - Boost cars, acquire cats. - Is premature #3 piston failure "normal"?

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- - Is premature #3 piston failure "normal"? (https://www.miataturbo.net/diy-turbo-discussion-14/premature-3-piston-failure-normal-76928/)

Quote:

Originally Posted by Savington (Post 1090022)

IIRC, cyl3 is indeed the one that runs hottest once you reroute the car. It's not significant, but it's enough (apparently).

I've only ever destroyed one motor due to detonation damage (likely caused by high IATs), and interestingly enough, it also occurred on cylinder #3. Same thing as you - light damage to all the pistons, heavy damage to one. That's anecdotal to the hilt, but still interesting.

Ooh, this is a good data point to have. Thanks.

Quote:

Originally Posted by eyesoreracing (Post 1090070)

Are 1.6 ECUs supposed to be batch? When we tested it by spinning the cam angle sensor, it fired sequentially. Does it go batch above a certain rpm?

Quote:

Originally Posted by Oscar (Post 1090071)

Didn't cali cars have sequential fuel?

California cars had fully sequential (four-channel) injection in 1993 only. All other '90-'93 Miatas in the US had banked (two-channel) injection, where 1/3 and 2/4 are paired together within the INJ harness.

Doesn't really matter, though. Even if this were a '94+ chassis I'd still say it's a mechanical problem rather than an electrical one. If you had an intermittent electrical connection that was causing one cylinder to occasionally misfire, you'd know about it.

Quote:

Originally Posted by Leafy (Post 1090064)

And it turned into some weird furry thing.

Ya don't shave one day, and everyone notices.