Fuel Pressure Question/Check

The fuel pressure should be around 38-39 with the vacuum hose disconnected off the fuel regulator, if you have an adjustable one, 35 would be a little lean.

Have you checked your O2 signal output?

94pony said:

Mine sits right at about 40psi with the hose disconnected.
Let me ask you this with the hose connected and reeving up the motor to like 2500-3000rpm my fuel pressure sits around 35 psi. Is this right I thought it would go up?

Click to expand...

It would depend upon the rate of change (accelerating vs holding it at 3K RPM), as well as load (if watching it while driving). If you are idling and snap the throttle open and let go, it should spike up and then fall back to your idle reading (the FPR works off the vacuum signal. You have lots of vac at idle, a good bit at cruise and almost none at WOT).

94pony said:

Do I still need to do this considering I replaced them yesterday?

Click to expand...

Just because a code is thrown doesnt mean the sensor(s) is/are at fault. Look for damaged wiring or a blown HEGO fuse. This is why it's nice to check the actual signal with a DMM so you can see what the sensor is doing. Do NOT puncture the wire sheath to the O2's however.