Compression question, What should I do? Options

[monkeyboy]

I pulled my motor out of the car to work on my Fuel Injection project.

When I pulled the motor I did a compression test. Cylinder 3 and 4 are at 115-120 PSI, and 1 and 2 are at 130 PSI.

Is that difference anything to worry about?

Leakdown is only 2-3 % on any cylinder.

Should I yank the heads and check the deck height since I have it apart, or is this not enough to worry about on a stock 2.0?

[euro911]

If you have the motor out and partially disassembled, half the battle is over.

If you have the time and a little play $, pull the heads and barrels, inspect the cylinder bores and check your rod play.

If the cam and lifters (and cam bearings) are OK too, you can re-ring it and lap the valves and seats (although your leak-down #s look ok). 15 #s is low though … it's only 8.5% of your highest compression reading (130 psi). I'd pump more in there to obtain a more accurate reading.

You've got a little homework to do.



EDIT:

I think I misunderstood - were you referring to the 130 vs 115?, or using 15 # to check your leak down?

130 is 13% higher than 115 and you'd like to keep lower than 10% difference