Auto Answers » View Question
scott
scott 8/5/2012
1987 Nissan D21 Base 4Cyl2.4L - Engine
i have changed the fuel injectors the throttle position still floods what could cause this
i also changed th oxygen sensor an the idle control valve
3 Answers
  • HouseCallAuto
    HouseCallAuto 8/6/2012
    47 psi with the engine running is way too high and will cause running rich. The cause of high fuel ressure is a bad fuel pressure regulator mounted to the side of the throttle body. Has to be 36 psi. or very close to that.
    Reply
    1
    HouseCallAuto
    scott 8/6/2012
    will that cause it to stall out when ecelarating.it is like the fuel shuts off and it will spit and sputter
    HouseCallAuto
    HouseCallAuto 8/6/2012
    fix the fuel pressure, it's wrong. It will cause a severe rich condition and foul all the plugs instantly.
    HouseCallAuto
    scott 8/7/2012
    thanks for your help.ordered part today
  • HouseCallAuto
    HouseCallAuto 8/5/2012
    Please elaborate much more about the "flooding", how you know it is flooding and all that. I want to help but please get me up to speed where you are with this. Just saying it is flooding does not mean you are right. provide me with enough info for me to agree or disagree with you.
    Reply
    0
    HouseCallAuto
    scott 8/5/2012
    when you crank it up a blur soke comes out the tail piep and it smells like gas.it spits and sputters to iget leveled out.i have changed the injectors ,throttle postition sensor ,idle dontrol valve ad the oxygen sensor.it still will hesitate alot when you giv it gas.iwas told it could be the ecm computr.if so how can ou check them to see if it is bad.
  • HouseCallAuto
    HouseCallAuto 8/5/2012

    1. Verify there is no fuel coming from either fuel injector with the key on engine off.

    2. Check fuel pressure - specification is 36 PSI.

    3. Check the Mass Air Flow (MAF) sensor output voltage on the Green/Black wire - look for 0.3 - 0.5 volts key on engine off and about 1.5 volts at warm idle.

    4. Check the Engine Coolant Temperature (ECT) sensor voltage on the Light Green/Red wire - look for about 1.0 volt on a full warm engine.

    5. Check the O2 sensor voltage to see if it shows rich (up near 1.0 volt).
    Reply
    0
    HouseCallAuto
    scott 8/6/2012
    my fuel pressure holds at 47psi is this bad?
close

Preview Answer