Hey guys here the deal ive got a 2000 f150 5.4L just did a engine rebuild after spinning a bearing so new crank bearings all new gaskets heads resurfaced new head bolts. So any it starts up idles runs and drives but idles rough and motor shakes but if you rev it up it evens out ive pulled the injector plug and coil on cylinder 1 while running and it acts no different at all ive checked and cleaned the injector its good and the coil ive checked it for spark and its good and the spark plug is good. Tommrow im doing a compression test but i want to hear possible suggestions maybe something im over looking thanks guys!

 

So what makes you think the problem is with #1?

 

Well i checked the rest of them unplugging the coil and the motor would idle differently and you could tell the difference but cylinder 1 doesnt get effected and i forgot to add that there is gas on the oil that is pushing past the rings

 

Gas on the oil?

What does this mean ?

Well, what I can tell you is, disconnecting the coil or an injector when running isn't going to help you unless you have a dead hole. And if you have such, the computer will ALWAYS pic that up giving you direction. What you most have is a low grade misfire. Those are harder to detect without retrieving history data via mode 6.

 

Gas in the oil lol but what do you mean by dead hole? And im going to hook up the computer to it tommrow when i get to work and let yall know what codes it throws

 

Dead cylinder, no fire.

Better drain that oil before going any further.

 

Hey guys so the past couple of days ive been looking at the truck and hooked up the computer and got codes p0171 and p0174 saying left and right banks lean and also p1409 as far as the lean codes ive checked all vaccum lines sprayed them all down with spray no difference clean the egr and iac and throttle body so im thinking maybe injectors fuel pump or filter it did sit for 6 months let me know what yall think and i did unlplug the dpfe sensor and it nearly died so im assuming its good and cleaned maf and its got all new gaskets let me know what yall think thanks!

 

Honestly, I think your nuts. But that's just me.

 

Im assuming from the engine rebuild that you cleaned the pistons and installed new rings? did you give the engine a chance to break in? Did you check around your intake manifold and make sure its not leaking?

But first things you probably should do it change your oil like Jbrew said to do!

 

That's where they leak, -even after new gaskets, if you don't follow procedure on the bolt down. -Exactly how they have it in service.

Right! That's a little crazy, after all that effort.

 

Ya oil has been changed come to find out there wasnt gas in the oil. My buddy checked it at work when we were tinkering with it and said there was gas in it so i went on his word and there wasnt any in it so wont take his word again. But as far as pistons rings rods all brand new. Torqued every single thing down to torque and sequence by the book. Yall think its possible a cam could be off by a tooth?

 

Why are you taking the codes so lightly?
Disconnecting injectors and coils won't tell you much at this point.
On a fault free system, doing these things will cause codes and not prove anything.
That's old style ways used on a carbed engines.
Why are you not looking at the 1409 code?
It involves the EGR solenoid vacuum regulator.
If the EGR is getting vacuum to open it, the motor will idle rough.
It advances the timing, cuts fuel and leans out the intake A/F ratio. These actions will surely make the motor run rough.
Better look into that first, then work on the intake air leak causing the 171/174codes..
Good luck.

 

Ok ill take a look at it today when i get a chance and check out the 1409 code thanks and ill let yall know thanks a bunch!

 

That should NOT happen - there should be NO difference at idle.

 

The DPFE has nothing to do with the EGR at idle.
The 1409 code is referring to the vacuum regulator and not the DPFE.
You apparently have a harness issue somewhere while working on the rebuild.
Remove the vacuum hose to the EGR to prevent it from opening.
Does the idle smoothen out?
If yes, find the reason the EGR is getting vacuum when it should not.
Investigate why the 'vacuum regulator' is allowing vacuum to pass on to the EGR. Are the hoses all on correctly? The code 1409 tells you that is the issue.

Good luck.