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1994 Ford Explorer Failing - Fuel System
Question: Engine constantly idles high/low sometimes even cutting off when started. Surgues forward when sitting a signal lights and makes a short poofing sound when cold. Could my fuel pump, injection regulator, and or filter be failing/bad. Have spent so much $$$ with no repair in site. I need help!
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Technican: hi! try getting a fuel injection cleaning done. " les"
Owner: You still didn't answer the question. Could the issues I descripted be caused by a faulty fuel pump or injection regulator? The idling high/low and poofing of the engine???
Technican: Hello, What engine do you have? I don't think either a fuel pressure regulator or the fuel pump is at fault here. Simply monitoring fuel pressure while the condition is present would speak to that...
You state you have spent $$$ and no fix. Has the battery been disconnected and created the event that the computer has to relearn its "keep alive memory" (KAM)? The computer "learns" driving habits and retains certain data relative to idle speed in gear, with a/c "on/off" and is supposed to adjust idle to load.
Has the throttle body bore been cleaned? Has the plunger and bore for the idle speed control been cleaned with Carb/Choke Cleaner?
Please advise.
Owner: I believe my engine in a V6 4.0 and yes the battery has been disconnected for the relearning process. However, I'm not sure if the throttle body, plunger, and bore have been cleaned. Are you sure these actions by my truck could not be a result of faulty pump and/or regulator?
Technican: Okay 4.0L. I'm going to see what I can get on the relearn process (unless you already have it).
If the throttle bore, butterfly valve, idle speed plunger and bore are sticky from fuel varnish build-up they wont perform well. The idle speed can go too low and if/when the idle speed control tries to bring the idle up to prevent a stall, the sticky build-up has to be overcome for the throttle to move. When the throttle does move, it is likely too far, the idle goes high, idle control closes the throttle...cycle repeats.
Please monitor fuel pressure while the condition is present and tell me the hi/low readings. Then I could rule out (or fault) the pump and regulator by specifications.
You seem very skeptical of the pump and regulator..what focuses your attention there?
Owner: My reasoning has to do with the fact that as we speak my truck is being "so called" repaired by a shop for $900, as I am SICK of the DRAMA, they says my problem is a faulty fuel pump and injection regulator. So even if I wanted to do the things to which you ask, I can't now. So I guess for peace of mind I ask again. If all of this things checked out to be clean and OK, could these two parts be my problem. Hey, also do you think I should ask for old parts? And is there a way to tell whether or not they're faulty by LOOKING at them? ;-)
Technican: If my suggested items turn out to be clean and do not factor, I would have to see the gauged fuel pressure to agree pump and regulator are at fault.
I sure don't want to add to your drama! Yes, I'd ask for the old parts and I wouldn't pay the bill until they showed me the vehicle is fixed. I wouldn't pay for parts I didn't authorize either.
No, its doubtful these old parts that were running an engine would show you a visual fault you could use for judgement. But, if you have the old parts and the failure repeats, you can demand they put your old parts back on, to refund your money and move on as you see fit.
It's about honor, trust and your business. They need to honor you and earn your trust and business. Stay in charge, it is your money and I respect that. Here's How To Get Guaranteed Solutions In Minutes
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