Question?

[ca18detizzle]

Ok, my car has been having starting issues and could not rev past 3k rpm. So I did some research. First off, I wired my knock sensor to the ecu because it was not wired. Second, I decided to get a walboro fuel pump 255. Installed that because my stock 240sx fuel pump was tired. After that, boom! Everything started / revved fantasticly. This weekend, I was low on fuel, so I filled her up all the way. I crank it to start... no go. I was stuck at the gas station until I got towed by my friends truck. I left my car at her house. THen this morning I came over and started the car. It started. Very rough, but it maintained idle after 5minutes. I drove it home steady. The car still felt strong and had juice in her. I was thinking that I may have been running rich and the spark plugs could have been the issue. I bought some new ones NGK, and installed them with the proper gap. The old plugs which I had put in there 2 weeks again were already black and smelt like fuel. Also, I decided to do an oil change, or check the oil in the oilpan. I was suspecting a bad headgasket. So I drain the oil.. Nope it was not a headgasket but.... FUEL IN THE OILPAN. So I'm assuming it's bad pistons? and piston rings? Will do compression test tonight, but I was just making sure what are the symptoms of fuel in the oilpan or how it gets in there. Thanks everyone. God, I'm so pissed.

[Chris859]

Don't go jumping into new pistons and rings because there was fuel in your oil. Plugs were black too? Well - Part of your problem is obviously that you are running way rich. All of this started after you installed the 255lph pump, correct? If you are running the stock ca18's fuel pressure regulator - that is half of your problem right there. It is common knowledge that the ca18's fpr gets over run by the 255lph pump. You NEED an adjustable fpr(so you can adjust the pressure to 36psi, as it is most likely way high right now)...period. Does it just run like crap at 3k, or does it actually cut out - like an rpm limiter? If it is cutting out like it was rpm limited, that means the computer is going into limp mode - Usually due to way messed up sensor readings, or something being wired wrong, disconnected, etc. Start with the fuel pressure regulator... and go from there.

[r34 gtr]

two strokes use a gas/oil mix and they run just fine!! also, my car had a walbro 255 and the stock fpr and it ran fine for several years. check the voltage across the o2 sensor and stuff, it could be causing some problems. see if the ecu is throwing codes or anything, etc.

[ca18detizzle]

Hey Chris,

Thanks for the reply, ordering one right now. Anymore ideas? And the 3k thing, it actually cuts out, not running like crap. But I got that problem fixed.

R34,

I'll check the voltage to the o2 sensor. I checked for codes and nothing.

[ca18detizzle]

One more thing, so by not having the adjustable FPR disables my car from starting up?

[r34 gtr]

no the walbro 255 just overruns the stock fpr to some extent. its more under load than at idle. it should have nothing to do with your car not starting, if it is working properly. now if your fpr is shot you could be in some trouble. try checking the fuel pressure.

[ca18detizzle]

OK this is weird. I just got done with some homework and decided to try and start the car. Guess what? It starts and idles fine. Did not idle rough at startup or anything. No weird symptoms. Is there any explanation for this? I am still getting an adjustable FPR, but this is just weird to me.

[float_6969]

Engine Goblins...

[Chris859]

well, you said it was really cold/humid outside when the problems started right? And there was condensation on your valve cover... Maybe something electrical got wet? And now that its dried out it is working again. Or possibly a temp sensor that is messed up... have you checked that out yet? On the fpr issue - my ca18 ran like complete crap with the stock fpr and a 255 pump. It idled smooth, but WAY rich... and loaded up with fuel just before you hit boost(but ran alright after I got into boost). Altitude plays a big role in the fpr issue. I live at about 7000ft elevation - and it ran like crap here, but when I was out of town with the car at 1000ft, the fpr issue was less noticeable. just my .02