Compression Help

[DaveR]

I also read recently to keep your throttle all the way open while cranking, Not sure if this is still required for new EFI's, but I did it anyway.

[CMIDD]

Ok. I think there is something wrong with my compression gauge. Tested today, gauge read between 35-40psi on all six cylinders. That seems awfully low. The engine starts and runs great. I think I will try a different gauge tomorrow. Seems to me that if the compression were that low, the engine would not even fire.

[DaveR]

make sure you let it go thru 4 or 5 compression cycles to build up pressure

hard to watch and crank by yourself sometimes.

[CMIDD]

I was wondering how many cycles to go through. I am use to working on cars, and was not sure if the two cycle was any different. Would it start and run with 40 psi????

[otis44]

I don't know if one would run at 40psi or not, but i'd bet your gauge is bad or something else is going on. I've also read that a warm engine will read a little better (not much but a little) than a cold engine.

[DaveR]

You can borrow my guage if you are anywhere near louisville or bullitt co