compression test results need help

[blackdemongsx]

well my cars oil recently started to smell like gas and gets very dark and liquidy after about month after i changed it. so ive read on here to do a compression test. So I did one tonight and here is what i got. i got 170 170 140 and 170. so when i dropped a bit of oil in cyl 2 it jumped out to 210. Now my car isnt smoking or burning oil at all. It just making my oil smell like gas. all the plugs looked pretty lean with white tips on them and none of them had oil on them. Yall think cly #2 with 140 is leak causing gas to go into my oil. Any advice would help Thanks

P.S when i did the compression test i forgot the read the part to press the pedle at wot. I just turned it over for about 4 revolutions.

 

[oldschooltsi]

I ran into the same problem and it ended up that one or more of my fuel injectors where leaking and draining down the cylinder wall. When you change the oil you might even find that you have more fluid than what you put in because of this. I know it may sound crazy but when injectors get old they just don't hold like there suppose to at times. Hope this helps.

 

[blackdemongsx]

thanks oldschool. Im gonna try to switch out my injectors and change my oil and see if this fixs it. I hope it does. How would i know if i have a leaky injector and can i get them fixeds like at Fuel Injector Clinic.Thanks

 

[oldman]

I'm sorry but those compression numbers clearly shows the ring is in question. Repeat the test again with wot and crank until the gauge stops rising instead of just 4 cranks. If the result is the same, do a leak down. Your main concern should be the thinning of the oil, not good for bearings. Good luck.

 

[psychlow]

It sounds like the injector is leaking on the cylinder with bad compression.

What happens when this occurs is that the fuel makes its way down past the rings and mixes with the oil in the bore. The oil then becomes thinned, since gasoline is a solvent for oil. You end up with too little lubrication in that cylinder, and the rings start deteriorating because of the extra friction.

You'll probably want to pull the engine, pull the head, and check the bore to make sure it's in spec. If it is, you can get away with rehoning it and reringing the piston. It's possible that it won't be, though, which means it may be time for an overbore and some new pistons.

If you decide that you don't want to rebuild right now, that is another option. If it's not burning oil, I'd probably just ride it out until I had the cash to upgrade, if it were me.

If you can determine that it was an injector (or some other rich condition) and correct the problem, you can be pretty confident that you should no longer have any major concerns about the fuel thinning the oil, as long as you can correct the problem before the rings wear much further on that piston.