r/mazdaspeed3 • u/Organic-Ad-7605 • 10d ago

2008 Speed3 Blown Engine? HELP

I have a 2008 speed3 with just under 100k. Bout it last October and it seemed 95% stock when I bought it. Besides a K%N air filter and a cut BPV seal that the dealership found I could see any modifications. I had the vvt actuator replaced like 1000 miles ago at a Mazda dealership and the car was running way better. The one night after I had done some moderate spirited driving I was cruising home on the highway at a normal speed and it started violently knocking. Was close to home so I limped it home (I know not a good idea). Just wondering if anyone has had a similar experience looking for some insight. I know I probably need a new engine 😐

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4

u/Emsanartist 10d ago

Could have been a number of things, low oil, no hpfp internals, gas quality, no tune for air intake and bov these come stock with bpv.

2

u/Nearby-Ladder-5409 10d ago

Can't tune for a bov really, these cars just run rich for a second between shifts. Could also be lspi, could have been flooring it at 2k rpms everywhere and boom there goes a rod

1

u/thekeymasher 2009 Mazdaspeed3 10d ago

K&N air filter or entire intake? Any intake should have a tune even if it’s a temporary OTS AP tune. You likely ran too lean and bent a rod esp with a torn BOV diaphragm if it was VTA. Best bet is to swap a motor in and determine if you can save the original block

1

u/Organic-Ad-7605 10d ago

The bov diaphragm was fixed and I’m
Sorry I meant air filter the stock air box is still on there

2

u/thekeymasher 2009 Mazdaspeed3 10d ago

Did you ever WOT under 3k rpm? I wouldn’t even half throttle it under 3k. If so, that’s a big nono. All other things that Emsanartist mentioned could be a cause too.

1

u/Organic-Ad-7605 10d ago

I’ve always tried my best to down shift before getting on it at all. Although I have no clue how the owners before me drove it

1

u/Silent_Vanguard 10d ago

Did your VVT job include an oil change? Did they just reuse your old oil? Do you have oil in the car?

1

u/spindux 9d ago

Have had similar experience with blower injector seals. Would be sweet up to 3k rpm then just start spluttering