Engine Trouble
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Just my own 2 cents. I had a similar problem with my 91 f250 5.8 liter... Was the TPS, Throttle Posistion Sensor, about $30 and located on the bottom of the intake plenum. Its basically a resistor to tell the cpu what position the throttle is in at any given time. The most common malody is that they where out at the bottom end, ie. idle to mid range throttle.
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From: Easton,Ks
If the FPR were stuck closed the pressure would go to 90+ psi.
If it were stuck open maybe your pressure would be very low.
Here is a diagram of an FPR:
http://i54.photobucket.com/albums/g9...Fuel/fpr02.gif
If it were stuck open maybe your pressure would be very low.
Here is a diagram of an FPR:
http://i54.photobucket.com/albums/g9...Fuel/fpr02.gif
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Originally Posted by nevets61
Just my own 2 cents. I had a similar problem with my 91 f250 5.8 liter... Was the TPS, Throttle Posistion Sensor, about $30 and located on the bottom of the intake plenum. Its basically a resistor to tell the cpu what position the throttle is in at any given time. The most common malody is that they where out at the bottom end, ie. idle to mid range throttle.
My motor is a 5.0 so maybe some difference??
But the pictures are really helping..
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[QUOTE=subford]If the FPR were stuck closed the pressure would go to 90+ psi.
If it were stuck open maybe your pressure would be very low.
Here is a diagram of an FPR:
http://i54.photobucket.com/albums/g91/subford/Fuel/fpr02.gif[/QUOTE]
Oh, I see. Thanks Bill. Great diagram.
Ok, then open it might be. On the "getting fuel" note, with two tanks and pumps, I have switched betweent the two and still the same problem, so I assume that at least it is not the pumps. However, I will check the pump fuses also when I change the FPR.
If it were stuck open maybe your pressure would be very low.
Here is a diagram of an FPR:
http://i54.photobucket.com/albums/g91/subford/Fuel/fpr02.gif[/QUOTE]
Oh, I see. Thanks Bill. Great diagram.
Ok, then open it might be. On the "getting fuel" note, with two tanks and pumps, I have switched betweent the two and still the same problem, so I assume that at least it is not the pumps. However, I will check the pump fuses also when I change the FPR.
Post Fiend
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From: Bonita Springs FL
I am very surprised that no one has pushed you to retrieve codes. I see that you tried it earlier, but didn't get any results. If you just plug it in and pull the codes and don't get anything, then you did something wrong.
Back to what Eric said - throwing parts at the problem is expensive and a crapshoot, as you have found. Get the codes and start from there.
Back to what Eric said - throwing parts at the problem is expensive and a crapshoot, as you have found. Get the codes and start from there.
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Originally Posted by andym
I am very surprised that no one has pushed you to retrieve codes. I see that you tried it earlier, but didn't get any results. If you just plug it in and pull the codes and don't get anything, then you did something wrong.
Back to what Eric said - throwing parts at the problem is expensive and a crapshoot, as you have found. Get the codes and start from there.
Back to what Eric said - throwing parts at the problem is expensive and a crapshoot, as you have found. Get the codes and start from there.
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Originally Posted by EPNCSU2006
Is code 0 a valid OBD-II code, or does that just mean that there's no output? I'm not familiar enough with OBD-II to know if it's telling you anything special.
So no help there. I sure do wish there was a code so I could use it as a starting point to diagnosis the problem..
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Fleet Owner
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From: Easton,Ks
1996 Fuel Selector wiring:
http://i54.photobucket.com/albums/g9...elSelector.gif
http://i54.photobucket.com/albums/g9...elSelector.gif
Last edited by subford; Nov 7, 2006 at 10:08 AM.
Post Fiend
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From: Bonita Springs FL
Originally Posted by EPNCSU2006
Is code 0 a valid OBD-II code, or does that just mean that there's no output? I'm not familiar enough with OBD-II to know if it's telling you anything special.
Fleet Owner
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From: Easton,Ks
Other things that can cause this with no codes are Bad Ignition Switch, Bad PCM Power Relay or Inertia Switch and they’re wiring or plugs.
Also the wiring under the Relays and their sockets can be bad also.
Also the wiring under the Relays and their sockets can be bad also.
Last edited by subford; Nov 7, 2006 at 11:59 AM.
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[QUOTE=subford]1996 Fuel Selector wiring:
http://i54.photobucket.com/albums/g91/subford/Fuel/1996FuelSelector.gif[/QUOTE]
Great diagram..Wish I was a better automotive electrician...
http://i54.photobucket.com/albums/g91/subford/Fuel/1996FuelSelector.gif[/QUOTE]
Great diagram..Wish I was a better automotive electrician...
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Well, well, well.. Good news everyone. I got the new fuel pressure regulator today and changed it out in about 5 minutes. I noticed something that I didn't before and I will have to check it again tomorrow. There is a small fuel puddle on the manifold under the fuel perssure regulator. So I cleaned it up and will re check it now that I have replaced the FPR. The old one was a Ford unit I guess but it said made by Bosch. Interesting. The new unit had a different gasket style under it and was made by Sorrenson in USA. Anyway, fired it up and she kept running. Idles fine and seems to run fair. I think the gas might be a little bad ( old yeller has sat for about a month and a half with this problem )so I will fill the tanks with fresh gas to offset that. I had no problem changing the serpintine belt as it needed that too. So many thanks to all who helped with their ideas and recommendations.
The one problem I still have is that I cannot seem to get the fuel filter off. I have a disconnect tool and have inserted it in and pryed and pulled and grunted etc.. Still cannot get either fuel line off. Hmmm.???
I will try again tomorrow but not sure what I may be doing wrong??
Any thoughts?
The one problem I still have is that I cannot seem to get the fuel filter off. I have a disconnect tool and have inserted it in and pryed and pulled and grunted etc.. Still cannot get either fuel line off. Hmmm.???
I will try again tomorrow but not sure what I may be doing wrong??
Any thoughts?