It found information on ABS - that's all.

 

I'm not sure on the 88 but I think the computer is up behind the e brake pedal, unplug it under the hood, remove from under the dash?

Advanced search did nothing for me. If you include the model and year it comes back nothing, not to use that information. Without including the model/year what good would the results be?

 

Yo Kart18 - thanks for getting this thread back on track. Do yourself a favor and do NOT replace the EEC/PCM (the computer) just yet. What happens is that the PCM (Powertrain Control Modual - the EEC is just the type of sytem you have) simply reacts to various data it receives and checks its memory table and then controls your other components accordingly. It is not smart. And it can get confused, but they dont "break" that often. To make matters worse, when you start replacing everything you can think of, you may be replacing perfectly functioning OEM components with inferior new stuff that only complicates the system. You can get to the point where you're chasing a ghost. So please, do not replace your PCM just yet. Can you confirm that under the drivers side, on the chasis rail, there is a fuel filter on the right, close to the engine, and moving backwards to the tanks, there is a hi-pressure fuel pump, and then moving back there is a black canister with four fuel lines entering from the rear and two fuel lines exiting forward, and then the fuel lines going back to your tanks without any more devices? This will only take you a minute to confirm. Let me know. Thanks.

 

after 30 seconds advanced search gave me this link:

https://www.ford-trucks.com/forums/8...questions.html

 

this thread has at least 666 tracks.

 

What key words did you use?

I used 1988 F-150 computer location

Without the "model" and with computer "removal" instead of location.

Each time it said nothing found, remove 1988 and or F-150 from the search.

I didn't want results for say a "94" computer location, I wanted results for a 88 model. Why using the year and or model included with it would kill all search results on this forum I couldn't say.

 

chas87f150 - yes to all you ask.

 

Kart18,

What was the results of the fuel pressure tests after the FPR was replaced?

To far back and to may others posting their issues here on this thread mixed in to find it but as I recall your results before changing it where backwards, higher value with vac to it then without? IIRC?

Did replacing the regulator correct that?

30-35 psi with vac connected, 40-45psi with line removed and plugged at an idle?

 

danr1 - I haven't re-checked the fuel pressure. I don't want to drive the truck to my buddies because of how bad it is running. I can however stop and borrow the gage tonight after work and re-check. I should probably do that anyway.

Let me ask something -
1. There is a line on the gage to screw onto the rail and check the pressure. (30 - 35lbs)
2. There is also a clear line, when I unhook the vacuum do I hook up this clear line to the FPR and plug the vacuum line? (40 - 45lbs)

 

1 - yes, 30 to 35 with the vac line on, 40-45 with the vac line pulled off the FPR and plugged, just hold your thumb on it a minute so the idle doesn't go nuts.

2 - clear line on the gauge right? gauge has a pressure release button? if so that is likely just a bleed/drain line so you don't have to do anything with it. Just push the button once to release any pressure before taking the gauge off so you don't get sprayed with fuel.

I thought you had retested, if not you really need to check the pressure now that the regulator has been changed. If it has the same values as before you probably have a return line problem. So yea hold off on the PCM test.

 

danr1 - Yes the clear line is on the gage. Yes it does have a pressure release button.

I'll check the pressure tonight and post this eveing.

 

Ok here's the fuel pressure readings with the new FPR on:

With the vacuum on - 32 lbs
With the vacuum off and plugged - 42 lbs

Todd

 

Well based on that I guess at this point where back at the computer again, I'd try another one.

And yea that's great if the yard will allow you to return it if it turns out its not the problem.

 

ok kart. im about 98% sure it isn't the computer. i have the same exact problem. and i have replaced the computer in my truck. i have done everything you have as well. but i think i found my problem... the exausht intakes gasket is leaking. i am going to break it all down within a few days. and put all new gaskets on pretty much everything.

 

the exhaust gaskets are leaking, or the intake??