[oneofmy3]

Well boy's im in need of some help again.My truck has been (running off) kinda stumbling when i am driving. Got a buzz test done and good news is all past the test. Did the cylinder contribution test and not good news. Cyliners 3,4,and 7 are not helping the motor run (failed the test). The truck has 360,ooo mi on her but does not burn oil and does not smoke out tail pipe. Any help? I hope it is not rings,could the injectors be bad but pass the buzz test?

Thank you

 

[BigFuel]

All on the same side and next to each other huh? Check the pigtail going to the that side of the head looking for damage/melting.

 

[madpogue]

All on the same side and next to each other huh? Check the pigtail going to the that side of the head looking for damage/melting.

No, they're not. 4 is on the other side. They're all three on separate UVCHs.

 

[BigFuel]

DOH! My dyslexia fouled my hypothesis.

 

[oneofmy3]

There is also a code p0113 =air intake temp sensor and PO 3444= CPS the cps in the truck now is the gray one is the grey one a bad one for my year? i have herd all kind of stuff about CPS's dont know what to do blue, black, or grey.

 

[BigFuel]

Is the Air intake sensor clean and not hidden or buried away under something?

Buzz test just sees IF the injectors pulse, CC Test tests the quality of the injector's pulse (I.E. the injector opens but only moves half the volume of fuel resulting in a less then balanced total injection pulse that includes all the cylinders or simply rough idle/cruising/accel). With the engine running do the "oil cap test".

CPS: dark blue original Ford (had issues), replaced by light blue or grey (still had issues but Ford concidered it "within spec"), black is the one from International not Ford (IMO the best there is). I buy International parts before Ford parts.

 

[oneofmy3]

Thank u. Big fuel ......"oil cap test "is to test blow by correct. If so all good on that half with cap off there is some blow by but cap upside down over hole it does not blow cap off.

 

[BigFuel]

Right, if the cap stays on then there is not likely sufficient blow-by on three cylinders and it's the flow of the questionable injectors at stake. When was the last fuel filter change? What does the fuel filter look like? Clean and white? Run a fuel stabilizer/cleaner through the system for a couple weeks and retest.

 

[oneofmy3]

i just did fuel filter change about 1,000 mi agao the old one looked good. i change fuel filter every oil change about every 4,000mi. i also run PS (power service?) fuel stabilizer with every fill up

 

[oneofmy3]

YOu migh be on to something tho i have never used the rear tank (has hole in it). But the other week i did by accident flip to the rear tank for a very quick sec. when trying to turn off the headlights and i hit the switch. I bet i put all kind of trash in to the fuel system.

 

[BigFuel]

Welllll, the filter and the fuel bowl screen (you are cleaning this too right?) should have caught any solid crap coming through the lines. IMO doing the fuel filter every oil change is excessive. Maybe twice a year unless you dont trust your filling station to buy quality fuel. These are stock injectors or semi-fresh?

 

[oneofmy3]

I get the fuel filters free from work so I say why not you know. I got this truck in Nov. but I do think they are very old maybe even stock! I have no idea. Do they just go bad over time?........o sorry yes I did the screen clean two months agao and it was plugged solid. I should prolly do it again huh. If it might be the injectors is there any way to test fuel flow with out sending them in? If they are bad do you know where to get a good price on some?

 

[85_305]

Which fuel filter screen are you reffering to? I've only changed my FF when it comes to fuel

 

[BigFuel]

I get the fuel filters free from work so I say why not you know. I got this truck in Nov. but I do think they are very old maybe even stock! I have no idea. Do they just go bad over time?........o sorry yes I did the screen clean two months agao and it was plugged solid. I should prolly do it again huh. If it might be the injectors is there any way to test fuel flow with out sending them in? If they are bad do you know where to get a good price on some?

Yeah they do go bad. Think of them as 8 little hearts, one for each cylinder. Your heart mathematically only has so many beats in its lifetime before it gives up. Same with the fuel injectors. Like in our personal lives things will change how many times they beat. Air and water going through them, silt, bad oil, too much heat. I'd doubt there was a way of doing it at home. Injector builders use all kinds of fancy machines to test theirs before sending them out to the public. NAPA wants $560 for 1 rebuilt injector. F-that Beans Diesel sells one at a time for $125ea. (+ a $100 refundable core so there is no down time on the truck waiting for the injectors to come). Most would do just the three, I'd do them all to keep the mileage the same on all the parts and have all of them under warranty at the same time.

Which fuel filter screen are you reffering to? I've only changed my FF when it comes to fuel

The fuel filter cartridge and the Fuel Pressure Regulator Pre-Screen (Ford PN 9150)

 

[85_305]

How do you clean that screen wtih the fuel bowl in? Do you have to clean the fpr screen also?

 

[BigFuel]

^it's the '95 version of the fpr screen

 

[85_305]

Ahh ok so my '97 doesn't have one? How do I clean my '97s fpr screen?

 

[BigFuel]

Found pictures, neat...

http://www.powerstroke.org/forum/94...el-pressure-regulator-fpr-screen-writeup.html

 

[85_305]

wonderful thanks man!

 

[BigFuel]

No worries, sorry about the link. Easier then describing it and the pictures are better then reading.