WTF is going on? Ran fine last night but this morning no go

[clever240sx]

Ok last night i took it home after going to town. Had it parked outside for while and then put it in the garage. This morning i wake up and want to leave for class at 8:30 and it started but only ran on it felt like 2 cyls. But it wouldnt die when i didnt give it gas, it just stayed at 500rpm. When i revved it it backfired and once again only ran off two cyls. I come back from school later and now it wont start AT ALL. I tested the first plug for spark and its there. Also there was fuel on the plug so its getting fuel. I just dont know what else it could be?

[Justin35ll]

You checked the first cylinder only? Check them all

[seanman]

check your mani to turbo gasket!! Mine started running on 3 cylinders after i noticed it was starting to act weird like a month before, but it would come and go, then one day it was 3 cylinders all the way. I took my turbo off after some discussion and the gasket looked like it was charbroiled haha. got the new one and it ran great.

[fast_s13]

my evo did that once. fouled out the spark plugs..dealer putnew plugs in and everything was fine

[clever240sx]

Well today i decided to do a compression test and then a wet test. Heres my resultsCyl 1: 1202:603:1204:120

Wet test1:1802:2403:2204:went past 300

But i dont get why cyl 2 was that low and then when i did a wet test it tested out normal?...

[Kansei240sx]

Did you do this all with the throttle body wide open?

When you do a wet test you need to pour the EXACT same amount of oil into the cylinders so you dont end up with a result like you did on cylinder 4.

General rule that applies to a compression test. Dry Test : If you have low compression on one or more cylinders or 0 compression it could be multiple things. Wet Test : If you have all near perfect compression or close after pouring oil in from a cylinder that was low, you have at least damaged rings. If you still have low compression or 0 after the wet test, you have a bent valve or a a valve that isnt seated right, which could be attributed to carbon build up causing a valve to not seal properly. A broken exhaust gasket if it is bad enough can also cause you to burn up and distort an exhaust valve which will also cause low compression.

Pressurize the cylinder at TDC on all four cylinders and see if you have bubbles coming out of your radiator, this could indicate a crack in the engine/oil coolant passages, (or more likely) a blown headgasket. Hope that helps.