compression test done today

[nightowl]

Hi all,

I have some figures here and want to know what you think.
Have a 1988 Ford Ranger pickup 2wd, 2.0 liter ,4cylinder engine with a 5 speed manual.

All 3 cylinders had a PSI of 140, and one with 110 Psi. It doesn't sound good.

What would the normal psi be for this engine?

Thanks in advance

 

[adsm08]

That's not awful. The last cylinder is pushing the bottom of the acceptable variation. It is only 78% of the others.

Here is a chart

 

[Mark_88]

I can't remember what mine was when I did it on the 2.0 but IIRC it was in the 130 psi range or higher.

Edit: just saw the chart from adsm08...thought it was 10-15% but the chart indicates higher...


What you can try is have a leak down test done to see if it is valves or rings. This requires a s
special tester and you can buy them for as little as $40 but you need an air compressor as well.