P0174 code and very rough idle

[Pilot Laslo]

As you can see in photo the hose is pinched quite a bit
Is there reason to believe that replacing it will solve the rough idle

 

[Pilot Laslo]

Also here is the hose I described as outside being oily

 

[Pilot Laslo]

Would it be worth it to buy a new hose from ford?

 

[RonD]

No, just clean it, I don't see where its Kinked, the hose gets smaller but thats the way a new one would be as well

 

[Pilot Laslo]

STFT on engine varies anywhere from -1 to 7% on both bays

 

[Pilot Laslo]

I will be replacing cam shaft and crankshaft sensors since i was having the p1336
hoping this will improve rough idle and knocking/bucking at high speeds.
will update with results

 

[RonD]

P1336 is not a sensor issue most likely, there are different codes for a crank or cam sensor issue

Cam synchronizer would be first thing to change, it usually comes with a new cam sensor

These are the codes for those two sensors if they start to fail
P0335 Crankshaft Position Sensor A Circuit Malfunction
P0336 Crankshaft Position Sensor A Circuit Range/Performance
P0337 Crankshaft Position Sensor A Circuit Low Input
P0338 Crankshaft Position Sensor A Circuit High Input
P0339 Crankshaft Position Sensor A Circuit Intermittent

P0340 Camshaft Position Sensor Circuit Malfunction
P0341 Camshaft Position Sensor Circuit Range/Performance
P0342 Camshaft Position Sensor Circuit Low Input
P0343 Camshaft Position Sensor Circuit High Input
P0344 Camshaft Position Sensor Circuit Intermittent

The codes the computer DOES NOT USE are as important as the code(s) it does use, Ford list here: https://www.therangerstation.com/tech_library/OBD-II_codes.shtml

These are very simple computers, not at all like a laptop or even smartphone, they use boolean logic, basically true/false, 1/0
So it just goes thru the list until it finds a true and sets that code



STFT between -1 and +7 is normal, it needs to get to -15 or +15 and stay that way for awhile, to set rich or lean codes
And LTFT(long term fuel trims) are the same they need to get -15 or +15 to set codes

So that P0174 is an anomaly , not sure why computer would set it

 

[Pilot Laslo]

After replacing sync and sensors still no luck!

 

[Pilot Laslo]

after 3 days of constant work it ended up being as simple as a grounded spark plug lead!
I did the water spray test and found it was grounding out on the exhaust
Thanks everyone for there help

 

[RonD]

Good work

Thanks for the update