View Full Version : S13 SR gas mixing with oil/slow

08-09-2013, 11:08 PM
SR has been rebuilt. Was running well for the first 1000 miles.
But its like it happened over night or I just wasn't keeping track of things as well as i should have.
Car noticeably felt slow under load. Like slower than KA. Cruising feels fine but once i get into boost there is no power. Just noise.
The car runs noticeably rich at idle, so Im guessing things get ugly once under load.
Changed CTS,checked timing, have pulled my fuel rail multiple times checking for leaky/stuck injectors,tried a different FPR,checked for boost leaks, etc etc etc.
Changed oil and like a week later i had to change it again because of gas in the oil.

Also when I pull the spark plugs and look at the top of the pistons there seems to be pits (detonation Im guessing)
Can knock sensor do this?
Compression test time?

This has been driving me mad for like a month now and i dont drive the car any more in fear of any internal damage from the gas in the oil. so an help will be greatly appreciated.

08-09-2013, 11:25 PM
Did you check the o-rings on the injectors?

08-10-2013, 07:04 AM
Yes I have. I've checked my injectors a bunch of times because that seems to be a common point with stuff like this. Also changed my PCV.

08-10-2013, 09:26 AM
Time to check ECU for codes.

08-10-2013, 09:37 AM
Yep compression test time. sounds like you may have a leaky p-ring. That's the number 1 way that gas gets into oil.

08-10-2013, 11:13 AM
I checked before and got a 55 but will check once again. Dorn, I read your thread and your problems seemed to be very similar to mine.

08-10-2013, 01:25 PM
Which thread? The one with the videos and stuff? Go get a new battery or hook up a good one from a friends car and give it a wirl. Also maybe try a push start? Idk

08-14-2013, 08:13 PM
did a compression test on the motor while it was cold

08-14-2013, 09:38 PM
They are all consistent so to speak. Typically a 10% or more variance between cylinders is bad, you're good to go. Leak down would tell you more.

08-15-2013, 11:42 AM
So then this has to be something AFM related, right? Maf, CAS?

08-15-2013, 11:52 AM
Leak down.

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08-27-2013, 07:30 PM
So I changed the oil a little less than a week ago, have not started or driven it since, went and checked the oil and level was right at the H and smelled kind of like fuel. I pulled the plugs and shined a light on the top of the pistons and 1,2 and 4 were wet on the top of the piston. Im guessing gasoline?
How would this happen? Stuck/leaky injectors? Could the ECU be causing anything like this?


09-03-2013, 11:49 AM
Bump, anyone?

09-03-2013, 05:35 PM
Kind of a long shot, but I had a similar problem on an old s13 I had. Basically ended up being the ECU. Someone had previously changed the windshield and didn't seal it correctly, water would drip on the ecu until it finally got inside the case and shorted the circuit board.

09-03-2013, 05:41 PM
surprised nobody said boost leak check first

08-25-2014, 09:09 PM
So for anyone who is wondering, I gave up and parted the car because I could never enjoy driving the damn thing. I kept the motorset though and will put it in something and figure out what the problem was later.