Thread: Running Lean

My car has been running lean. I bought a wideband and at WOT I was running about 14-14.2. This is in my 92 Sentra SE-R with SR20VE swap. I'm running a place racing intake, hotshot gen6 header, full 3" exhaust, some thermoblock intake spacers, I30 MAF, and JWT ECU programmed for the I30 MAF and VE injectors. They say my A/F should be in the low 13's.

This weekend I installed my N1 cams. After break in I took it for a spin and was seeing 14.6-14.7 A/F ratios. I pressure checked the intake today and found a leak on two seperate hoses (pcv hose and another one coming off the intake). I never had clamps on those so I added some. I didn't find anything else leaking. I took it out for a spin and it's still running lean. It seems like its getting leaner the higher I rev, but its hard to tell with my display sitting so low (kind of have to look where I'm going). I think it might have even hit 15 to 1 up top. It starts out about 14.0 to 1 when the big cams kicks on at 4600. With it getting leaner with the new cams as well as at higher rpm makes me wonder if its a fuel delivery issue. I've got a new fuel filter laying around, I'll probably throw that on sometime this week and see if that does anything. Any other ideas?

what wideband did you buy? just wondering. definitely not saying it is the wideband, just making sure you didn't buy one thats not as good.

if you're worried about it, rather than get 370's get an adjustable fpr, bump it up to 4 bar, and send the ecu back to JWT for 4bar fuel pressure.

if i was u i would stop getting on it tell you fix your lean condition where is your sensor located.

are u running a stock fuel pump and stock injectors and fpr

It's where hotshot puts the bung on their gen 6.



Yes yes and yes.



PLX M-300

not a nissan expert but i am a auto tech first question are u sepost to get away with stock inj fp and fpr on this set up

Yes.

also if ur supost to be able to run the stock fp inj fpr and fuel press on your setup then i would run a fuel pressure test and if that turns out rite than i would run a fuel volume test. another thing when we run different cams in a chevy we adjust the the ign timing

do u have a check engine lite on

I would check fuel pressure if I had a gauge.



No.