Anyone can change a tire. If you're so good mine would be fixed by now!

 

Don't know, I will have to check and let you know. I am going to check the wires from the 02 and see how they look and I will check the two at the battery also.

 

Call local dealerships and see if any of them have a SBDS and somone who knows how to run it. That machine hooks up at the pcm and the tech can look at every sensor at the same time and see what is going on. We need to know what the sensors are reading to find the problem. I believe it is a o2 sensor issue. good chance its in the wiring from the computer to the o2. Hard to say without having the truck in front of me.

See now that is exactly what I suggested several pages back, if he did take it to a dealer, only do so if they can and will run that test. I thought it was called a
Breakout box", maybe called different names?

He stated checked the 02 sensor wiring and it is all good.

Fuel pressure checks out so that brought us back around to the computer as the fault.

Been to many pages but at one point it passed the KOEO test but had a CM code for system lean. Then later it failed the KOEO test as well, again it was suggested to check the O2 sensor wires, if them checked out ok then to replace the O2 sensor.

To what extent what has been suggested is carried out its hard to say, knowing some people have limited time and tools can and will effect that aspect.

Myself when I test a circuit I test it from one end to the other with a meter, not just a "visual" test.

Its running rich, real rich according to Todd. Pretty easy condition to notice/get right, so the computer thinks "lean" dumping in more fuel all the time trying to make it go rich, making a bad situation worse.
Regardless of the return line being restricted, if it is, the computer is still wrong, why is it wrong? the computer or the 02 system one of the two.

 

whatever!

you would not listen if i told you what was wrong, so i did not waste my time.

you wanted to just throw money at your truck and it seems that is what you are good at.

 

sbds is an old school tester for had in the late 80's. It is the best scanner for old obd1 ford out there. Most of then have died or been replaced with the latest like the wds or the ids. breakout box is not a form of scanner, it just plugs inline with the pcm and is a "splice" to test wiring to pcm. Very usefull tool, not to many around. testing circuit with a meter is a good way to look for a open wire, but a load test is the best way to check it. I made my own load tester with a duel ellement turn signal bulb and socket, wired it so both elements light at the same time to create higher load. This will find a bad wire that a ohm test might miss.

 

danr1 - If I stated that I checked all the 02 wiring then I need to apolijize. I know that the wires that are attached to the 02 sensor itself are ok but I didn't check past the conector towards the engine. I am going to check the wires this weekend. I am also going to make some calls and find someone who has this SBDS unit and make an appointment for the truck.

Sometime back I unhooked the 02 sensor and drove the truck like that. I was told that it would go to a back up setting and that if it ran better that ment the 02 was indeed bad. It didn't make a differance at all.
**Does this work? Is this a way to check the 02? Or was I led astray?

And yes it is running rich. I'm only getting about 7-8 mpg. I know I was getting 13-14 before the problems started.

Todd

 

I think that will just leave you in Open Loop. The problem with running it in open loop all the time is that you'll get horrible fuel mileage and the idle will always be high.

Are you sure you have no vacuum leaks anywhere?

 

I can tell you that I checked for leaks at least 2 - 3 times and a few of my freinds have checked and also the garage I took it to checked it for leaks. I also replaced the intake and plentum gaskets just to be sure they wern't leaking just in case we missed something.

 

Did you check around the throttle body gasket, the black coffee can on the fender, Brake Booster? How did you guys check?

If you took it to a real mechanic, why is it that he failed to diagnose the problem?

Did you torque the intake and plenums bolts to spec? Did you remember that oddball one that takes an allen?

And I just remembered, I purchase a used 5.0 that had a crack in the plenum. We didn't see it until I pulled the plenum because it was on the underside. I remember thinking that that would have been a hard vacuum leak to find.

 

yeah, what is up with that?

 

Quicklook2, I know you and Kart18 are having difficulties and that is between you and him. Please don't use my words to make your point.

 

ah, i was referring to what you said in agreement.

i have no problem with the o.p. but he seems to have an issue with me.

 

Good 'Nuff 4 me. Thanx

 

Kart18 - Yo, Im back. Please do an old cowboy a favor before he is planted six feet under and put aside your logic about what you think and have heard should be happening, grab a glass of milk for dinner, get the tubes cut and ready, and get under the truck and bypass the DFR. It will take you thirty minutes. Just completely (if it works I will explain later) bypass the DFR - all lines either plugged or passed around the DFR, turn the key on, listen for the fuel pump, then crank it. If it doesn't help then you won't have to read my dumb a** ideas anymore. But please, before you check more sensors, and recheck fuel pressures, and schedule an appointment for an SBDS unit just do what I ask. What is it going to hurt other than a few minutes and a few bucks.
Let this out cowboy die happy.
Chas

 

man, you seriously want him to try this.

don't die over this, it is not worth it.