but if you get your codes scanned that will point us in the right direction so we are not guessing. UVC issues will leave a code behind.

 

Jaaaaaaackman,

My AutoZone had one available through their loan-a-tool program. It's a $160 deposit on a credit card that's credited back when the tool is returned. Unfortunately it didn't show that I had any codes.

 

Two issues here, first the glow plugs not workings, sounds like a GPR (glow plug relay) There are several ways to check but if you had a glow plug problem or a UVC problem it would manifest in one or two cylinders instead of all of them. either jump your GPR connection with a screw driver (touch both big posts) for about 20-30 seconds and then crank, or use a Voltmeter/ test light when the Relay should be closed to see if you are getting electrical current through the relay.

Second issue, HPOP, you can check the oil level, you can add oil, but there are many misunderastandings concerning checking oil level and running out. The HPOP can run out when sitting without running for a given amount of time. That can create a no start/hard start situation. By introduction of air into the high pressure oil rails it can even create rough running for about 100 miles. When your truck is running the engine oil pump fills the reservoir, if the engine oil pump quits working then your truck will no longer run. The oil pressure sensor is mounted on the hpop so if it is working properly and registering pressure then their is oil being supplied to the HPOP. (I believe that switch is an on/off switch. It is not going to tell you how much pressure, just that it is there.)

There are several other factors with the HPOP that need to be considered... first HPOP malfunction, and second IPR and IPR o ring operation.

I guess to sum it up, don't spend to much time worrying about your HPOP running low on oil and filling it up, cause if that is the case, you will have lots of quite time to figure it out, if your truck is running, but doing so poorly look to other area first.

MY $.02

 

I think the problem was the small fuel screen on the side of the filter houseing it was totaly plug along with the filter being covered with a coating of sludge. I did get a cel but it was only 2-3 seconds however I don't have a code reader so I don't know what or if a code is present. Anyone know if a plugged filter and screen will throw a code? I ran the truck 45 miles today seems to idle smoother and quieter and also axccelerates smoother, anyway ran good all day. Next I will buy or find someone to read out the codes.... Thanks all.....



by the way the reason this truck has such low miles is that it was part of a company fleet and never left the small town that they worked in its a dully dumpbody 4x4, I bought it in dec 2005 with 47,000 miles.....

 

Bummer I still have the same problem , ........... I am trying to buy an OBD-1 but seems unavailable, waiting to hear from thr Powerstrokeshop.com on a scan tool........

 

Jackman, where are you lcoated? Maybe someoen on the board is near you and can scan the truck.

 

Stil looking for a code reader....... I think i may have found the problem, there is a small switch at the thottle pedal that I think is sticking. I have found that when the truck looses power it actully is just going to an idle with a CEL on but then the CEL goes out and the truck runs fine. I can duplicate the situation by depressing that small switch at the throttle pedal which turns on the CEL and sends the truck to an idle while in that mode the throttle pedal is not reponsive until I release the switch which makes me think that the switch is sticking sometimes. I have another PSD its a 97 F-250 I took the switch from that truck and put it in the F-350 then drove all day and had no problems. Bottom line here is I am guessing at the problem until I can find a scan tool.............

 

Sounds like you got it congrats.

 

The Accelerator Pedal (TP) sensor provides the PCM with the driver's demand for power. The TP sensor is a three-wire potentiometer that receives VREF from the PCM and returns a signal to the PCM directly proportional to the accelerator pedal position. The TP signal is used in calculating fuel quantity. Also, the TP input is used by the PCM to control the exhaust back-pressure regulator.

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A PCM detected fault of the TP sensor will illuminate the Malfunction Indicator Lamp in the instrument cluster. An TP signal that is detected out of range, high or low, will cause the PCM to only allow the engine to operate at low idle.

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Idle Validation Switch

The Idle Validation Switch verifies when the accelerator pedal is in the idle position. This switch protects against in-range failure of the AP sensor.

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A PCM detected fault of the Idle Validation Switch will illuminate the Malfunction Indicator Lamp. An inoperative Idle Validation Switch detected by the PCM will only allow the engine to run at idle.


Some have had luck cleaning the TPS & IVS with contact cleaner....

Can you read the DTC ?....

 

Some have had luck cleaning the TPS & IVS with contact cleaner....

Can you read the DTC ?....[/QUOTE]


Rick thanks for the info, I think my problem is the IVS which is the switch closest to the floor. Do you know the position of the IVS? I don't know what you mean by "DTC"............ I am heading over to Auto Zone to get the codes read hope they point towards a IVS or TP........

 

DTC ( diagnostic trouble code)....The two switches work together....The IVS says the opreator is not pushing on the pedal,The TPs says I'm, using the go pedal, this is what I want...PCM responds accordingly....

 

Oh DTC now I get it , sorry I am an old shade tree mechanic these new terms throw me but I am learnin .........Just got back from AZ and the OBD-2 read no codes, the guy the read out the codes is a Ford tech and he said the the PCM on a 95 only holds a code if the CEL is on so that said I think all I can do is drive it see what happens........

 

Jack, maybe you cand find one here:

http://www.dormanproducts.com/docume...s_Sensors2.pdf

 

And for the acronyms this link is for you

https://www.ford-trucks.com/forums/1...finitions.html

 

Thanks for the links, Ill be studying .........

I got some big time sticker shock today , the little IVS switch is only available as a unit with the TP and the pedal for the unreal price of 770 dollars........ Totaly rediculious Fords prices,, needless to say I am gona first try to clean the switch..........