My car has been pretty temperamental with starting recently, decided to do a compression test. the first series of cranks is with me holding the release valve open, the second is with it closed. wondering if I should be looking at rebuild options, given the numbers involved? the front rotor was only marginally better, individual cranks peaking around 70psi and a highest total of around 90. the car is an extended/street port 12a turbo, not too sure if that means that the expected compressions *would* be lower than normal....

other things to consider, would you say that the cranking speed was fast enough?

The final odd thing is that the last time it didnt want to start, unplugging one of the injectors made it fire up! which led me to believe that somehow the microtech ECU wasn't getting enough juice to run everything, while the starter was cranking. so on the one hand i'm tempted to go down this path of chasing possible electrical gremlins, but on the other, at a raw glance, the compression seems a bit dire

so go ahead and tell me if i need to pull the lump out, i guess?

https://www.youtube.com/watch?v=TKxK...ature=youtu.be

 

On second thought, im still not convinced that the compression is the cause of the starting problem... the car is much happier starting when the engine is hot, and if I spray some fuel in the inlet, it fires up immediately. The ecu is fuel only, with the original dizzy and modules handling the spark.. might look into if the microtech has a cold start function