EX with AT throwing codes 0301 and 1399.
New plugs and fuel filter, adjusted valves, cleaned TB. Checked all connectors and vacuum lines.
Fuel pressure is 22psi at idle; 34psi with FPR vacuum signal remove and plugged.
Misfire barely perceived over 3K rpms. Slow rise in rpms without load and no misfire. Under load miss is bad at low rpms.
I hate just hanging parts on it guessing. Fuel pressure regulator okay since it rises when disconnected or is it allowing to much fuel to return to tank? Do I install a new fuel pump and regulator?
Thanks for your thoughts!
have the same problem?
Thursday, December 15th, 2011 AT 4:46 PM