slisman
Well-Known Member
- Joined
- October 24, 2016
- Messages
- 111
- Reaction score
- 37
- Location
- Poland
- City, State
- Gdańsk
- Year, Model & Trim Level
- 2000 Explorer II
Hi guys,
I have "small" problem with my 2000 SOHC EX, which is returning few months after installing each new fuel pump. I have had problems with rough idle - car was stalling few seconds (5-15 seconds) after idling, sometimes there were misfires too. After this short time, car started working smoothly, no problems with acceleration etc. I have a returnless fuel system. All in all, after following repairs, I have replaced fuel pump...three times:
1. New OEM IAC.
2. New spark plugs and spark wires (autolite / motorcraft).
3. New in tank pressure regulator.
4. TPS sensor and throttle regulation.
5. New fuel filter.
6. New intake manifold gaskets (that was main suspect of stalling).
7. Vacuum checked (vacuuometer shows healthy/proper vacuum).
8. New in-tank fuel pressure regulator (unknown origin, bought by previous owner, can be cheap replacement part).
9. Voltage on fuel pump is constant and has proper value.
10. PCM reset and learning "new values" after each fuel pump replacement
During above replacement/repairs/regulations - I have had to replace a fuel pump three times. Since last replacement (done after new spark plugs and wires) everything has been running smoothly...but last weeks it got worse. Stalling and choking (especially on cold idle after night) became alarming. What it weird - if I turn off shortly after idle, and then idle again - everything runs almost smoothly.
Fuel pressure checked on schrader valve is 1,5 bar (21 psi) with turned key off and 2,2 bar (31 psi) on neutral after idle. Far to low values. Long term fuel trims at idle speed (1,5k rpm) are about 30%, at 2,5k rpm are nearly 0%. Short fuel trims at 1,5k rpm are about 5-10%, at 2,5k rmp rise to 20-30%.
I have no idea what to do - is it time to install fourth fuel pump? Have you any ideas what can cause continuous problems with fuel pump? May it be FPR's fault? Today I will also replace PCV valve. It can be related with stalling but I don't think that it could lower fuel pressure.
Everybody on our Polish forum is out of ideas and I am afraid of installing new fuel pump if it will become broken in few weeks. I will be grateful for every help
I have "small" problem with my 2000 SOHC EX, which is returning few months after installing each new fuel pump. I have had problems with rough idle - car was stalling few seconds (5-15 seconds) after idling, sometimes there were misfires too. After this short time, car started working smoothly, no problems with acceleration etc. I have a returnless fuel system. All in all, after following repairs, I have replaced fuel pump...three times:
1. New OEM IAC.
2. New spark plugs and spark wires (autolite / motorcraft).
3. New in tank pressure regulator.
4. TPS sensor and throttle regulation.
5. New fuel filter.
6. New intake manifold gaskets (that was main suspect of stalling).
7. Vacuum checked (vacuuometer shows healthy/proper vacuum).
8. New in-tank fuel pressure regulator (unknown origin, bought by previous owner, can be cheap replacement part).
9. Voltage on fuel pump is constant and has proper value.
10. PCM reset and learning "new values" after each fuel pump replacement
During above replacement/repairs/regulations - I have had to replace a fuel pump three times. Since last replacement (done after new spark plugs and wires) everything has been running smoothly...but last weeks it got worse. Stalling and choking (especially on cold idle after night) became alarming. What it weird - if I turn off shortly after idle, and then idle again - everything runs almost smoothly.
Fuel pressure checked on schrader valve is 1,5 bar (21 psi) with turned key off and 2,2 bar (31 psi) on neutral after idle. Far to low values. Long term fuel trims at idle speed (1,5k rpm) are about 30%, at 2,5k rpm are nearly 0%. Short fuel trims at 1,5k rpm are about 5-10%, at 2,5k rmp rise to 20-30%.
I have no idea what to do - is it time to install fourth fuel pump? Have you any ideas what can cause continuous problems with fuel pump? May it be FPR's fault? Today I will also replace PCV valve. It can be related with stalling but I don't think that it could lower fuel pressure.
Everybody on our Polish forum is out of ideas and I am afraid of installing new fuel pump if it will become broken in few weeks. I will be grateful for every help