Video as requested, wait untill I get to the rear window to see it. I couldn't keep the cam still enough to demonstrate any other shaking point, I'm not pro like SHOES.
The vibration at idle drives me nuts. :( Seriously, the ENTIRE CAR is shaking like that.
The idle is even harder/harsher than my RX7's idle with MMR mounts (Read: Solid bolt through). I strongly think it has something to do with the ECU, 'cause I've gone through for about the fifth time this morning checking all clearances - everything is correct mechanically, and except for tranny/driveshaft/diff/axles, everything else is gorramn new in the engine bay/drive train at this point.
I don't see how it could physically be mechanical - higher rpm should mean more vibration, not less. Short of it being PPF alignment, which I eyeballed, I don't know wtf it could be.
incorrect, the stock engine will be in worse balance between 600-1200-1800 rpms and vibrate the most. Over these rpms it will be fine and smooth out. I know from experince and my friends at the machine shop that works on cranks and blocks.
Also at motor without a idle valve will idle lower at cold by 100-300~ rpm vs when its warmed up, so you maybe near 600 rpms or so cold and 800-1000 rpms warm, and trust me just those hundred rpms make a huge difference in the vibration the motor puts out.
I've dealt with MMR mounts before on a miata, not again unless race car.
if you have stiff mounts in the rear it will also transfer in vibrations too.
Swapped in those plugs, gapped to what the manufacturer guys recommended.
Now it idles like absolute dogshit (And vibrates so ------- hard), with near-constant misfiring - previous idle problems were caused by misfiring incidentally. Partial throttle is dogshit, tons of misfiring or hesitation. Decel is dogshit, tons of misfiring or hesitation. Acceleration is the best I've had it yet on the Miata.
When my car was first running on MS something caused a CPU reset (power failure or something) that totally bombed my firmware. Thing started running like complete *** in the strangest ways and as a last ditch I reflashed the firmware and that solved it. Worth a shot maybe?
Well, it fixed several things I've been having problems with.
Hell, the goddamn AFR's actually match up perfectly now between tunerstudio and my gauge. Starting is so much better (SO much better) with the new firmware, and it actually helped a little bit with the misfiring.
But it didn't solve it. It's still pretty bad. Should I swap back to my old plugs, and see if they don't have such large problems Ele?
(Edit) Yeah, holy ----. It solved a ton of problems I've been having with various bits and pieces, but it didn't solve the misfiring problem.