S13 SR gas mixing with oil/slow - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mikefc · 08-09-2013, 10:08 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?
MAF?
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.

KiLLeR2001 · 08-09-2013, 10:25 PM

Did you check the o-rings on the injectors?

mikefc · 08-10-2013, 06:04 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.

KiLLeR2001 · 08-10-2013, 08:26 AM

Time to check ECU for codes.

Danger_Dorn · 08-10-2013, 08:37 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.

mikefc · 08-10-2013, 10:13 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.

Danger_Dorn · 08-10-2013, 12:25 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

mikefc · 08-14-2013, 07:13 PM

did a compression test on the motor while it was cold
140,140,140,135
thoughts?

jr_ss · 08-14-2013, 08:38 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.

mikefc · 08-15-2013, 10:42 AM

So then this has to be something AFM related, right? Maf, CAS?

soundboy · 08-15-2013, 10:52 AM

Leak down.

Sent from my GT-P3110 using Tapatalk 4

mikefc · 08-27-2013, 06:30 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?

hallllllllllp

mikefc · 09-03-2013, 10:49 AM

Bump, anyone?

Kallixtos · 09-03-2013, 04:35 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.

Kingtal0n · 09-03-2013, 04:41 PM

surprised nobody said boost leak check first

mikefc · 08-25-2014, 08:09 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.

08-09-2013, 10:08 PM	#1
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	S13 SR gas mixing with oil/slow 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? MAF? 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. __________________ MOON LIGHTER

08-09-2013, 10:25 PM	#2
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	Did you check the o-rings on the injectors? __________________

08-10-2013, 06:04 AM	#3
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	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. __________________ MOON LIGHTER

08-10-2013, 08:26 AM	#4
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	Time to check ECU for codes. __________________

08-10-2013, 10:13 AM	#6
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	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. __________________ MOON LIGHTER

08-10-2013, 08:37 AM	#5
Danger_Dorn Zilvia Member Join Date: Oct 2012 Location: Jacksonville NC Age: 30 Posts: 265 Trader Rating: (0) Feedback Score: 0 reviews	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, 12:25 PM	#7
Danger_Dorn Zilvia Member Join Date: Oct 2012 Location: Jacksonville NC Age: 30 Posts: 265 Trader Rating: (0) Feedback Score: 0 reviews	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, 07:13 PM	#8
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	did a compression test on the motor while it was cold 140,140,140,135 thoughts? __________________ MOON LIGHTER

08-14-2013, 08:38 PM	#9
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,052 Trader Rating: (34) Feedback Score: 34 reviews	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. __________________ My SR20VET

08-15-2013, 10:42 AM	#10
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	So then this has to be something AFM related, right? Maf, CAS? __________________ MOON LIGHTER

08-15-2013, 10:52 AM	#11
soundboy Zilvia Junkie Join Date: Aug 2013 Location: trinidad Age: 41 Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	Leak down. Sent from my GT-P3110 using Tapatalk 4

08-27-2013, 06:30 PM	#12
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	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? hallllllllllp __________________ MOON LIGHTER

09-03-2013, 10:49 AM	#13
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	Bump, anyone? __________________ MOON LIGHTER

09-03-2013, 04:35 PM	#14
Kallixtos Zilvia Addict Join Date: Feb 2009 Location: Long Beach Age: 33 Posts: 824 Trader Rating: (60) Feedback Score: 60 reviews	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, 04:41 PM	#15
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 38 Posts: 4,648 Trader Rating: (17) Feedback Score: 17 reviews	surprised nobody said boost leak check first __________________ 5.3/4l80e/turbo 240sx playthrough: https://tinyurl.com/turbo240

08-25-2014, 08:09 PM	#16
mikefc Zilvia Junkie Join Date: Jul 2007 Location: Chicago Posts: 462 Trader Rating: (6) Feedback Score: 6 reviews	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. __________________ MOON LIGHTER

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