Fuel delivery

JAMES FRYMYER

MEMBER
1995 FORD EXPLORER
4.0L
V6
4WD
AUTOMATIC
200,000 MILES

I have removed and cleaned throttle body, idle air control valve n the EGR valve. And replace all of those gaskets.I replaced MAF sensor. I have also removed the upper air intake and cleaned it all out and replaced the gasket. I also ran seafoam through the intake. Replace the coil PAC and put on new plugs and plug wires. I have also replace the fuel pump and the fuel filter.
I have tried to hook up Scanner OBD 2 and it says error cannot connect. So being the year that I have it also has OBD1 so I did that and pulled codes 172, system lean bank one. 136, system Lean Bank two. So I removed both O2 sensors and clean them both. 167, TPS did not exceed 25% rotation. 411, can not control RPM during test. 214, CID circuit failure. 122 TPS circuit below 0.6 volts. 332 EGR did not open fully or respond during test or did not open intermittently EVR or PFE. 532, data communication link or electric
instrument circuit failure. I am not sure how correct these codes are beings that I pulled them on multiple occasions. I am going to buy or rent fuel pressure test kit so that I can check the pressure at the Schrader valve.

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Check fuel pressure with a gauge a couple of those sound like low fuel pressure is causing it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The other problem may be a connection or connector problem also check fuses under hood you may have one blown.

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Thursday, June 9th, 2016 AT 6:04 AM

JAMES FRYMYER

MEMBER
2 POSTS

I hooked up a fuel pressure gauge and only got to check the pressure while it was idling, the gauge read 19 psi. I revved the gas a few times n it did not change. Stayed a 19 psi. That is all the person said I needed to do that owned the gauge. Of course this was before I got to read your answer and checked out the link. But I believe the pressure should have been 41psi. So it really did not help me tell if it was the pump or fuel the pressure regulator. He thinks it is the sock or screen on the pump. Or he said possibly the fuel filter. I am not sure because I do not have any fuel on the vacuum line of regulator nor do I have any black smoke out of exhaust. But when I press on the gas pedal it bogs down and almost dies out. I can press on the gas slow and gradual and it will raise the rpm's and rev up to 3000 rpm's. And that is it. Every once in a while it might catch just right and go over 3000 rpm's, but I don't like that so of course I let right off. So I guess I am back to the process of elimination. Throw some more parts at. I do not know what else to do anymore. That or invest in a new truck. But that is not anywhere in the budget and probably wont happen.

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Thursday, June 9th, 2016 AT 4:59 PM

HMAC300

MECHANIC
48,601 POSTS

You should have 35-45 psi with key on or idling. 35 at the very minimum. It is probably the a weak pump. Normally a new sock comes with it and you should replace your fuel filter as well as hard telling the last time it was replaced. If regulator is bad then the pressure will drop fast after shut down which it should hold for at least five minutes within 5 psi.

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Friday, June 10th, 2016 AT 6:55 AM