Im getting a aftermarket fuel pressure regulator that can be adjusted what should I adjust the fuel pressure to it’s a 92 300zx N/A

 

It should be adjusted to the stock fuel pressure. And hopefully you aren't buying a $10 ebay special...

Is there something wrong w/ your stock one?

 

It's ~44psi at idle. And there is literally no benefit at all to an adjustable FPR.

 

yeah the car giving my signs of a bad fuel pressure reg and no it’s a $15 eBay special one

 

Could've gone with a new stock one and never had to worry about it not being adjusted properly...

 

yeah but it’s so much money and what if it’s the thing that’s not wrong with it I feel bade that I have all ready bought them denso that are not suppost to have in there

 

... so you feel bad that you didn't research spark plugs and you put the wrong ones in, and as a result, you chose not to do research on fuel pressure regulators? lol

It's EASY to diagnose a bad FPR. Connect an in-line fuel pressure gauge and start the car. If the fuel pressure is not ~44psi at idle (and doesn't fluctuate directly with vacuum - at WOT, the gauge should read ~60psi), and/or if you turn the car off and the pressure drops to 0, the FPR is bad. If the needle vibrates badly, the damper is bad. Diagnosing fuel pressure problems is that simple.

 

yeah im not very smart some told me to that denso where good spark plugs and to discount the vacuum line and if the car doesn’t speed up you FPR broke

 

Sell!!!!

 

im not getting fuel pressure why?

 

How about you give us more details. I take it you hooked up an in-line fuel pressure gauge... how'd you do it and what'd you do from there?

... could be a bad fuel pump...

 

i hook up the FPR nothing was reading on the gage hook up the fuel pressure gage no reading i can hear the fuel pump its making a whining noises you think the fuel pump could be bad?

 

Dude, that is too vague for us to tell you anything. Where in the system did you connect the fuel pressure gauge?

Post pictures of the gauge setup and the fuel feed and return lines, too. (If you have the feed and return lines crossed, or the FPR installed backwards, you won't get any pressure, so we need to see how they're installed.)

 

ok this is what happen so fare. when i hook up the FPR car ran a lots better it even stop getting bad gas mileage but still stalled it was not stalling that much. tonight i went to my friends house to recheck the fuel pressure it turns out his fuel pressure gauge was F'ed up and was not reading. we hook it up to his car and didn't get a reading. we also found that i **** up and put the FPR on backwards stupid me, so we turn it around. the gauge on the FPR was very low about 20psi turned all the way up. the gauge was jumping around to and the car ran even worse then when i had it on backwards it didnt stall that bad but now it stalls a lot more when im coming up to traffic lights its idling at 500. when i stop it dies. i called parts stores and they told me they dont rent gauges. so what do i do? ill try to post a video tomorrow

 

You can buy any cheap mechanical fluid gauge of any kind (oil pressure, for example) that can read up to 60psi+ and fabricate your own plumbing into the fuel system from parts at Home Depot.

I still want pics to make sure you didn't completely screw up how the fuel system is routed.

Ultimately, I think you're going to end up taking this car to someone like Ash (he's somewhere in northern Florida), because I think you've either messed things up or your car was screwed up badly to begin with, but I'll try to provide insight for now.

 

here the video

http://www.youtube.com/watch?v=COhH1uqF1og

 

Yeah it does seem like it is running better, since the last video you posted. Honestly, I think Z's in general, it is just one of their faults. I have had similiar problems with my 280zx's too. Usually more, when they are cold. Hopefully it cleared out, and fixed itself to a degree. Minus the parts you have replaced. Good luck man, hope you get it figured out.

 

well guys and girls im a dumb @$$ are you ready for my dumb @$$ story her it go a few month ago i was getting a really high idle around 2k rpm well like and dumb @$$ with a screw driver i tried to get the idle down. you know that little idle silver screw on the throttle bar well i put it all the way down. come to fine out it was the connector on the TPS that was lose so like a dumb @$$ i put up my tools and didn't move it back so this morning i put it all the way back to where it was suppose to be well the car started up and it idle fine like a car should with a high idle till it gets warmed up still the idle was a little high and it was still running rich so i did another ECU check and got code 13 engine coolant temp sensor so i when up to auto zone spent $15 and got another replaced it and its running fine no more stalling and im getting good fuel pressure cars running fine so sorry to waste yalls time

 

No biggie man, things get overlooked quite easily. It has happened to me many times on my Z. You will do some weird adjustment. Or change something. And then forget, and sit there go crazy, trying to figure out, why you are having some many problems. lol All aside, glad you got it figured out. Now go enjoy your Z, and don't take it for granted. I really miss driving mine.

 

... lesson to be learned: if a 300ZX is having problems, more often than not, it's electrical.

 

yeah im going to get the Consult Computer Diagnostic Software thing

 

put in a fuel pump and got the pressure that i needed 44psi so alot of this was do to the fuel pressure from the fuel pump