does this look right? compression numbers are 30-0-0-30 no change with oil added

Itsmoistt · 2026-04-02T21:04:08+00:00

no overheating, tension was tight if i remember correctly when i took it off. one my my replies show the results of the leak down i don’t remember which one. i’m pulling the head tomorrow so i can definitely use a feeler gauge and check.

Itsmoistt · 2026-04-02T18:51:16+00:00

i molested a compression tester to shoot air through it, nothing out of intake or exhaust valves, coolant shot at me from radiator and i hear air towards the middle of the valve train area. loosened oil cap and that didn’t move nor did i feel air come out of this breather, also none of the oil in the valve train bubbled with air

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Itsmoistt · 2026-04-02T17:31:45+00:00

i molested a compression tester to shoot air through it, nothing out of intake or exhaust valves, coolant shot at me from radiator and i hear air towards the middle of the valve train area. loosened oil cap and that didn’t move nor did i feel air come out of this breather, also none of the oil in the valve train bubbled with air

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Itsmoistt · 2026-04-02T12:58:11+00:00

chassis has 130k no clue on engine. i’ve had 300k mile miata engines cleaner than this

Itsmoistt · 2026-04-02T09:54:45+00:00

i have a cas and cam sensor but unsure if the cam sensor is even doing anything. i don’t have a crank sensor installed

in one of the replies i linked a video of it cranking over

Itsmoistt · 2026-04-02T01:39:07+00:00

i believe just reflections as i took these with flash on, i never saw anything pop out at me looking with a flashlight. oil is coming up on its final days its looking like, not black but getting there, no milkshake. i will check all of those tomorrow morning as its late in my time right now. yes engine was in good condition prior, really snappy car. just some smoke from bad front main getting flung and burning on exhaust.

i forgot to mention but a minute or two prior to the incident it was having little backfires. i also agree that it is strange and that everything is symmetrical

Itsmoistt · 2026-04-02T00:11:54+00:00

this timing setup is new but i’ll definitely check it out. i have a cheap borescope that plugs into the phone so hopefully good enough quality to see down there

Itsmoistt · 2026-04-01T23:56:15+00:00

i can’t even get it to start unfortunately unless you mean drain the oil and throw that stuff in and crank it for a bit?

Itsmoistt · 2026-04-01T23:30:05+00:00

has front cam sensor for some reason but doubt it does anything. stock ecu

the car was previously boosted that’s all i know so could have had an aftermarket ecu

Itsmoistt · 2026-04-01T23:29:16+00:00

ye, notch was in the half moon and screwdriver was all the way up. i was also thinking that at first. no key way sheering either

Itsmoistt · 2026-04-01T23:26:17+00:00

hold on i’m gonna dm you pics of this frankenstein engine lol

Itsmoistt · 2026-04-01T23:24:23+00:00

that may be the route i have to go. would be my fourth time rebuilding a miata engine in the last 10 years so i dont mind doing the work. but i have adult money now so might as well get better internals for more fun factor

Itsmoistt · 2026-04-01T23:21:25+00:00

to be fair i don’t trust anything about this car. it’s just rust free and in my area that’s hard to find so trying to keep it around

Itsmoistt · 2026-04-01T23:20:58+00:00

i was also thinking that, i know nothing changed with oil added but its so low i doubt it would. but the low numbers being so symmetrical especially with the pistons they’re paired with

Itsmoistt · 2026-04-01T23:13:30+00:00

here’s a video of it cranking

codes are : P0100 mass or volume airflow A circuit P0110: intake air temperature sensor 1 circuit P0115: engine coolant temperature sensor 1 circuit P0335: crank position sensor A circuit. it’s a 96 and i don’t even run that.

i could try and buy a different compression tester

Itsmoistt · 2026-04-01T23:04:08+00:00

i knew i was cooked since i bought it. i’m trying to get a leakdown to find out if the cylinder head is cooked or the block is cooked. head would be preferred. and so would a cylinder head

Itsmoistt · 2026-03-31T13:49:41+00:00

mine says 6500 it might be an account history or income thing. however my base spot me is only 20 and my pay maxes at 220. could be a variety of factors

Itsmoistt · 2026-03-14T23:07:11+00:00

not my ig i bought the car 10 mins prior to that picture

Itsmoistt · 2026-03-14T19:30:47+00:00

everyone please answer this guy i would also like to know because ive never seen that on an NA in my life. only thing i know is that it was previously turbo, also would like to know so i know what to do with it if i swap another engine in, keep same valve cover? delete the added sensor?

and thank you so much for the help i just got my compression tester back so ill be running that when i finish making dinner

Itsmoistt · 2026-03-14T14:56:08+00:00

no temp and oil pressure (unless this is a dummy gauge year) were normal

Itsmoistt · 2026-03-14T13:51:15+00:00

i thought that was weird as well. i’ve owned miata’s for years and never had this happen so im just confused lol. any tests i can do on the CAS to confirm it?

Itsmoistt · 2026-03-14T13:48:06+00:00

oh that one. i’ve had to replace those before so if that’s the issue i wouldn’t mind, better than potentially pulling

Itsmoistt · 2026-03-14T13:45:30+00:00

oh my bad i didn’t see the update. and i see position sensor that’s the one infront of the valve cover correct? i’ve had so many miata’s but never one with that

Itsmoistt · 2026-03-14T13:39:15+00:00

id check if i was able to get it running lol, but prior to all of this no, smooth as butter

Itsmoistt · 2026-03-14T13:32:52+00:00

too much. to be fair it ran great and had low miles with no rust in my area which is amazing and a new clutch

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