My new to me sport trac

[Larry Holmes]

Happy Hanukkah

Thank you and Happy Hanukkah to you too.

 

[mcarroll02]

Thank you and Happy Hanukkah to you too.

Shabbat Shalom

 

[mcarroll02]

Wellnit most definately was not a crank sensor. Was headed to town to pick up some electrical stuff for my cabin. Got about 5 miles from the house(after it had ran at idle at home perfectly for a half hour) and it lost powe, misfired real bad and then quit. Coasted into a side road...after a few tries i finally got it to restart and it ran like crap for a few mins and then got better. Drove home and it did ok. Pulling in my driveway it almost wouldnt pull the hill in my drive. Got it home and am about to run a quick scan before i hop in the f250 and go get my stuff.

 

[mcarroll02]

Codes are as follows:
P0306 cylinder 6 misfire
P0174 system lean bank 2
P1150 lack of ho2s21 switches fuel trim at limit
P1151 lack of ho2s21 switches sensor indicates lean
P0171 system lean bank 1
P0303 cylinder 3 misfire

 

[mcarroll02]

been sitting here at home with it running, moving about in the drive and its running smooth for a while the it will stumble and misfire a few times and then go back to running good

 

[mcarroll02]

Ill check on it more when i get home. I gotta run to lowes.

 

[cadman777]

Codes are as follows:
P0306 cylinder 6 misfire
P0174 system lean bank 2
P1150 lack of ho2s21 switches fuel trim at limit
P1151 lack of ho2s21 switches sensor indicates lean
P0171 system lean bank 1
P0303 cylinder 3 misfire

Great, thanks.
Can you get Fuel Trims (STFT & LTFT)?

Have you smoke tested it yet?
Mine was leaking intake plenum seals, very common on these.
Had to spend a pricey 90 bux on new plenum bolts from Ford, b/c they're 'special'.
It's not a difficult job, it's just a big job.
Gotta remove everything on the top to get the plenum off.
Took me 8 hours, mostly due to inspecting and cleaning up everything.
Plus, I put in new timing chain tensioners (Motorcraft), valve cover gaskets, spark plugs, and all the o-rings and other seals that were on the top end.
When the plenum was off, I could see the valves.
B/c I use Jectron fuel system cleaner every year, they were spotless.
There was around 90k miles on it when it needed this work.
Now there's about 150k miles on it, and it still runs good, except it needs the timing chain cassettes.
The plenum seals used were Felpro blue.

 

[Pat in RI]

Just a thought but after reading several forums and recalling that my 86 F 150 had the same symptoms, it turned out to be a rusty clogged fuel filter. Can you confirm you have good fuel pressure at the rails?

 

[cadman777]

Just a thought but after reading several forums and recalling that my 86 F 150 had the same symptoms, it turned out to be a rusty clogged fuel filter. Can you confirm you have good fuel pressure at the rails?

It's possible, but...
If he has those high LEAN fuel trims on one bank, then it sounds to me like there's a vacuum leak.
But we won't know without seeing some live data.

 

[mcarroll02]

Great, thanks.
Can you get Fuel Trims (STFT & LTFT)?

Have you smoke tested it yet?
Mine was leaking intake plenum seals, very common on these.
Had to spend a pricey 90 bux on new plenum bolts from Ford, b/c they're 'special'.
It's not a difficult job, it's just a big job.
Gotta remove everything on the top to get the plenum off.
Took me 8 hours, mostly due to inspecting and cleaning up everything.
Plus, I put in new timing chain tensioners (Motorcraft), valve cover gaskets, spark plugs, and all the o-rings and other seals that were on the top end.
When the plenum was off, I could see the valves.
B/c I use Jectron fuel system cleaner every year, they were spotless.
There was around 90k miles on it when it needed this work.
Now there's about 150k miles on it, and it still runs good, except it needs the timing chain cassettes.
The plenum seals used were Felpro blue.

Ill pull fuel trims later, working on getting electricity to my cabin today. No on the smoke test. Dont have a way to do that. I replaced all intake manifold gaskets when i replaced the valve cover gaskets about 2 years ago. Replaced tensioners at the same time. I know it needs the cassettes replaced. Dont have the time and money to deal with that at the moment. Fuel filter was replaced close to 10k miles ago....next to last oil change. And i run felpro gaskets for everything except head gaskets. Those i prefer the cometic mls gaskets.

 

[cadman777]

Sounds like you have most of tje bases covered.
I guess the fuel trims are the next thing I'd look at to get moving in the right direction.