Ford Repair Questions? Ask a Mechanic for Answers ASAP
hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.Roy
ok, first, the fuel pressure is below spec and will cause both these codes. the spec is 35-55 idle.
when the hose is removed it should jump up about 10 lbs. the pressure with the hose on will rise as the engine rpm goes up as there is a loss of vaccuum to the pressure regulator.
1. pcv stuck open
2 vacuum leak, most common is intake manifold
3, mass air flow sensor
4. fuel pressure
I would start by getting the fuel pressure up to where it should be. it will take replacing the pump and filter
your pressure is not correct for the specs.
I just posted the specs. did you not see it???
you may have a bad new pump. what brand did you use???
what was the pressure on the old pump???
barely within specs
the trouble shooting is the pressure test.
did you check the pressure in the old pump???
how did you verify no vacuum leaks??? the intake is the most common failure. how did you test the pcv and mass air flow??
ok, so you also believed the old pump was bad because of the pressure readings.
I still think you have an issue with the pump.
ok, that sounds good. the test for the pcv is to remove it and put your finger over the end and see if the long term trim drops. if it does, it is no good.
the only thing left is the fuel pump.
ok, it is obvious that you and me are not on the same page. I give opinion based on your input. I am not there and cannot touch feel it or see it.
I am opting out since you are not taking my advice. my suggestion is to give whoever follows me the benefit of the doubt that they know what they are talking about.
happy new year
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Would you like me to try and help, if so can you list out each ( 1)_____?) question you need answered?
If you want to verify good power and ground to the pump then you must do so right at the pump connector on the fuel tank.
While the key is on and the pump is running you should get battery voltage on the pink/black wire and no resistance to ground on the black wire.
Please read this:
Thanks for using Just Answer, Chris
Fuel pressure is good.
Long term trims should remain 20 to -20 and short term trims 10 to -10 You want to take these readings at a steady rpm, when you snap the throttle a change outside these parameters is to be expected.
Hello again Chris here,
Do you still have lean codes stored?
What reading at hot idle do you get from the short term trims and MAF sensor?
The MAF min and max reading at hot idle is 4.8 to 6 G/S which is 0.63 to 0.79 LB/M
So your MAF is reading right.
Your STFT is within +/-10 at hot idle.
Your fuel pressure is good
If there were a vacuum leak, it would show up at idle when vacuum is highest.
I am beginning to think your PCM is to blame.
You have been doing the tests. Your finding that all readings show to be within specs though the PCM is showing codes that appear not related.
You already checked the fuel pressure so the regulator is out.
If it were a injector nit spraying enough fuel you should see the trims really high at set rpm as the computer is saying to add more fuel.
I still believe this is PCM related.
Trims will always go out of spec when applying or releasing throttle. Those PIDS are designed to be monitored only at a steady rpm. Unplug the IAC and see if the high idle is now gone.