Did a compression test today for the first time. I'm not expert In reading the results though so if anyone could help me out that would be awesome.

2000 Ap1 140k mile
New spark plugs 15 months ago or about 10k miles
It was pretty chilly out today so I think my engine may have cooled down fast therefore affecting my results
Outside temp: 60 F
Starting motor temp: 180 F
Ending motor temp: 125 F
Cyl 1 would be closest to the front of the car and cyl 4 furthest away. I cranked the car a total of 8 times each time. The results:

Cyl 1: 213 - 212 - 210 - 205
Cyl 2: 185 - 185 - 185 - 185
Cyl 3: 185 - 170 - 170 - 170
Cyl 4: 180 - 180 - 175 - 175

As you can tell its constantly going down but I believe it's because of my engine quickly cooling. It took me a while after I did the first cylinder because the gauge got jammed so I think that may be the cause of the difference between the first cylinder and the other 3. So I redid the test on cyl 1 again at the end after cyl 4
Cyl 1: 170 - 170 - 170 - 170

Now the spark plugs.
Cyl 1: EXTREMLY different then the rest it was covered it black wet gunk I'm guessing oil
Cyl 2: dry and white
Cyl 3: dry and white
Cyl 4: dry and white

When I post the picture of the spark plugs they'll be in order from 1-4. If anyone wants to chime in and help me out translating my results id really appreciate that.

 

Was your battery able to crank enough? Numbers are really low but many factors can cause that.

Hold gas pedal to the floor? If not need to pull fuel pump fuse and hold it wot when checking each cylinder.

220-240 are most common compression numbers however consistency is the most important thing.

 

Yes I forgot to add. I did remove the fuse o the fuel pump and I also held WOT during all of the tests. I'm I'm San Antonio TX with an elevation of 650' above sea level. And I did notice that my battery was loosing juice. By the time I did the 4th cylinder my cluster was going very dim when cranking. And when I out everything back together my car BARELY turned back on it was cranking over very slow.

 

Yeah redo it with a new battery or have another car jumped to your battery while doing it to get real results.

 

Ill re-do it again tomorrow and post nee numbers. By using jumper cables from my truck to my car. When giving my battery a jump should I have my truck off or on?

 

Just leave the truck on so you don't kill the truck battery.

Had to jump my old battery on my S2000 before a replaced the battery. Wouldn't crank enough to give accurate results.

 

Three spark plugs look normal. The first plug has some oil deposits. Any chance that plug wasn't torqued properly ? , as there are deposits on the upper body of the plug as well as the parts within the cylinder. The excess oil consumption of that cylinder may explain the higher compression numbers of that cylinder.

 

Yes there is a possibility it wasn't torqued down properly. I know they go at 17 or 18lbs but I don't have a torque wrench I've been meaning to buy one for the longest but I never get around to it. I usually just torque them down by "feel". I'm going to redo the test tomorrow with the better battery and post back with more accurate results and hopefully the weather is a little warmer too so my engine doesn't cool down as fast.

 

Those plugs actually look pretty gnarly for only 15k miles on a NA set up. The first cyl #1 is actually heavily oil fouled on the electrode which is never a good sign. F20's are notorious for burning oil either through the valve guides or rings or both. There is a healthy amount and an excessive amount which would indicated an issue. I assume you have been topping off your oil between changes? How much? Yeah take another comp test and you might consider replacing those plugs with the proper trq spec, making sure your tube seals are not weeping into the spark plug holes (that wouldn't explain the oil deposits on cyl#1 however.

 

Yes I do always stay on track of my oil level and always add oil. How ever I do believe the last time I added oil I may have gone a bit over board and added too much oil. Would that have anything to do with my build up on cylinder 1? I also have never done a valve adjustment. I got the car with 120k miles and I'm at 140k now. I'm not sure when the last adjustment was but I've personally haven't done one. That's my next step but I wanted to check my compression first.