Crank no start

[tannerezell077]

I have a 91 240sx with a ka24de.
I recently just finished up my turbo project on my 240 and got it all tuned and the bugs worked out of it, so I thought. I went for a drive to the gas station to get some fresh gas seeings how I was very low. on my way there I run out of gas(gauge is incorrect). Shortly after I ran out some loggers stopped and ask if I needed help then they said they had a little gas enough to get me back home. after I got home which was less than a 3 minute drive I put 3 gallons of 87 octane in the car (always run 93) and head towards the gas station. Seems to be running fine then I put it in 5th gear and it backfires a little bit and then a big cloud of blackish rich smoke comes out my exhaust and it dies. got it home to see what the issue is
I have confirmed that I have the following:
- I have spark to all four plugs
- Checked timing and its spot on
- I have fuel to the fuel pressure regulator and obviously to the injectors because when I pull the plugs they have gas on them
- The motor is getting air
It cranks fine, and stumbles and shakes like it tries to start when I stop cranking. the battery is fully charged. I am able to check the tps % and maf and so on from my laptop it all seems okay to me. Could it possibly be bad gas? it seems to me like its flooding out and fouling the plugs. Someone please help I need to get this car back on the road and any info would be awesome!

[PapaSmurf2k3]

Try pulling the fuel pump fuse and then cranking. If it fires right up and then dies, you're getting way too much fuel.
How are you controlling your injectors? Do you have an adjustable fuel pressure regulator?

[macgiver]

mac,you mighta got contaminated fuel outa those ' loggers ' ? (unintensional?? ) Could
some Diesel fuel or even 2-cylce w/oil explain all that ? Black smoke & poor "Poppin" performance (If 'n motor WAS otherwise OK in beginning of your story) ? Just a "lead" here,and so maybe an immediate fill-up of that 93 octane stuff !! See what becomes of it .

[tannerezell077]

Update: I got the car running a few times today and made a little bit of good progress.
-Drained old fuel and filled up with fresh 93
-New ngk plugs
As soon as I put the fresh gas in and let the plugs and inside the cylinder air out, I let the fuel pump prime and it fired right up and run. I try to restart later and nothing. went and got the new plugs and it seemed to help it would fire up and run for a few.
Now this is the odd part that has me thinking it running rich, I unplugged the relay for the fuel pump so it wouldn't pump anymore fuel and the car fired up and run for about a minute and a half without the fuel pump giving any fuel?????? I guess it had dumped so much fuel previously it was just burning it off? I'm so stumped here and I've obviously narrowed it down to a fuel issue I just can't figure out how to solve it.

[PapaSmurf2k3]

Well, there's residual fuel pressure in the lines and stuff that bleeds off, and that's why it keeps running, but yeah, based on what you're saying, its probably super rich.

[macgiver]

mac ,I would keep trying to run it out ,run that "good" 93 fuel - because what if something in that weird Logger fuel - I hope didn't mess up the injectors causing them to "Leak-down" or change their flow characteristics ?? keep flushing it out simply by RPM's , Techron maybe,WOT etc.

[PapaSmurf2k3]

Eh, most of that would cause him to run lean, not rich.

[tannerezell077]

Eh, most of that would cause him to run lean, not rich.

Update: replaced fuel filter and fixed small boost leak. i haven’t had much luck still but i have found it almost wants to start up every time i crank it when the fuel pressure is around 5psi. all these things have been done with the maf unplugged to eliminate the chance of it being a bad maf. cleaned the iacv as well.

[PapaSmurf2k3]

If you get it running, try shaking your wiring harness around the TPS area, where it comes out from above the intake manifold. If it stumbles/dies/idles up, you've got a wiring issue.