Originally Posted by The_Honda_Guy

115 is extremely low. The lowest you should see is around 130. Also, all cylinders should be within 21 PSI of each other at the MOST. I'd definitely say the low compression on cylinder 2 is causing the misfire. Either you've got a valve acting up or the rings are shot. I'd vote closer to rings due to you running a turbo.

You can use your compression tester to read things pretty easily. If you've got bad rings, you'll see the first bounce on the compression test read low, followed by it slowly building up to final compression. Your first bounce should be roughly half of the final number. Another way to tell if the rings are bad is if you put a tablespoon of oil into the cylinder through the spark plug hole and run the compression test again. If the numbers increase drastically most likely the rings are the culprit. If you just plan get low readings it's usually a problem with the valves not seating at the proper times or not seating at all. If you get no compression it's most likely a bent valve or valve stuck open.

Just to make sure - is the engine at operating temp when performing the test? Do you have the throttle wide open? Fuel/spark disabled? Do you have all the plugs pulled out? Battery pack on the battery or another car jumping the battery? These are all things that can show lower numbers if not done.

Essentially all the leakdown tester does is pressurize the cylinder and allow you to see how much it's leaking and where it's leaking to. You simply set each cylinder you're testing to TDC, then listen for where the air is leaking. IIRC 10% is normal leakage since no engine is perfect at sealing. Most of the time your leakage will be passed the rings, which is the reason that cars are fitted with PCV systems.

Originally Posted by ek9_Junkie

its ur map sensors its going out cuz my car does but it got to the point where if i use my old map sensor it bogs very bad so when i run without it i get engine light a lil back fire only becuz its running rich soo i think its the map or tps and if it was a spark plug or spark plus wire it would bog