$amGD3

So I've been throwing codes 1 and 43 which is for the o2 sensor.I changed it out yesterday and cruised around town for around 100 miles and no codes,though I never had the ac on.this morning driving to school with the ac on,cel no.1 came on


What psi should my fpr be at? It's currently at 56 with the vac hose on.

It's a b16a2 with I/h/e and itr cams on stock ecu


Thanks everyone

Former User

What brand O2 sensor did you install?

Did you check the O2 sensor wires that run to the ECU?

$amGD3

It came off my buddys Si,so I'm assuming oem


I'm wondering if it's running rich because of the increased psi from the fpr

Former User

Code 43 -- not code 1 -- could be caused by a fuel pressure problem.

High fuel pressure would certainly cause an engine to run rich. What was the pressure when the FPR vacuum hose was disconnected?

$amGD3

I wanna say around 60

Former User

Is the FPR vacuum hose clogged or is the FPR toast?

$amGD3

I don't think so?the fpr was adjusted because I rookie to the dyno with a different ecu and it needed more fuel.it adjusted so I don't think it's done for

Former User

^Okay.

The stock pressure should be 30-37 with the hose connected and 40-47 without it connected.

$amGD3

So lowering it and resetting the ecu should work you think?