So car ran fine.

added a MS, car was running on 2-cly.

fixed MS, car now shooting out white smoke.


is that the actual sequence of events or are you leaving out important details?

The same exact way MS is to blame for your "blown head gasket"

Pro tip:
If you want legit responses you might try not trolling your own thread.
It's pretty easy to derail a thread, but relatively challenging to get it back on topic again.

you may have popped the gasket after you may have hydrolocked the engine with the 2cyl issue

yes this is the way it went

note taken

would it take that much fuel to hydrolock a cylinder. I removed plugs half way through and there wasn't an absurd amount of fuel. IE fuel wasn't gushing out the plug hole

it might. It think it happened on RyanG's car (or someone else with an MSM who had a ms/injector issue and blew engine upon first startup)

not very common, but can happen

....and that's of course assuming you didn't screw up anything else that may have caused this

How would it be gushing out unless the pistons where in motion? Aren't liquids incompressible?

lol "gushing out of plug hole"

this isn't free willie dude, it doesn't take 2 gallons to pop a HG

so you're thinking that I had almost like a small scale hydro lock that blew the gasket? Ill go home and see if the coolant tank is bubbling

possibly.

or a really untimely coincidence

That'll only explain if gases are breaching the waterjacket. I'd look at oil as well. Not from the dipstick. Just drain it and see if it smells of fuel

That'll only explain if gases are breaching the waterjacket. I'd look at oil as well. Not from the dipstick. Just drain it and see if it smells of fuel or has moisture

well, oil tends to be pretty moist :giggle:

and if he ran without spark in 2 cyl I'd be surprised if he doesn't have fuel in the oil. but I'm not sure that's what blew his HG

You are right, I meant to elaborate by saying vapor that may have stratified in the oil making it look milky diarrhea.

Head gasket failures arent really a common thing on miatas. you see many guys running turbo miatas with great power on stock gaskets and studs. take a picture of the smoke and post it for our entertainment............i mean evaluation.

If i am remembering right, you can pull one plug wire at a time while it is running and see if the smoke reduces. that could tell you which cylinder is presenting the problem. It has been so long since i have dealt with a head gasket i cant recall if that works or not. Im sure one of these guys will tell me im an idiot if i am wrong. Hell, they might tell me that even if i am right.

That sounds like a cool idea. Only because it reminds me of antilag and dropping spark in cylinders to allow fuel to be pushed through the exhaust manifold to ignite at the turbo and making a chuchuchu sound during throttle lift because compressor surge and no bov.

i looked inside the cylinder hole and it looked like the firing cylinders, should've been more specific sorry

my vocab is off jeez. There wasn't any pooling fuel in any cylinders. I think I'm blowing this issue out of proportion.

they're not a common failure from making power safely
if you have an uncontrolled explosion or sudden pressure spike inside the cylinder at the wrong time, it will take out the hg and can even snap a rod
Miata owners are known for blowing things

Have you swapped back to the stock ECU and tried starting the car to see what happens then?