Recent content by PReal

It’s got 4 duralast could and 4 from rock auto. They are all new and made no difference. According to the paperwork the motor mounts were replaced and they look like they were.

Long term fuel trim for bank 1 is bouncing between -1.6 and -2.3. It will stay steady at one of the values, mainly -2.4 for a while. Long term fouel trim for bank 2 is steady at -0.8

Both the trims stay on the same range between about negative 1 and 3. The issue is the frequency at which the trim changes the trim on bank one is 4 times more often. The trim was changing due to my AC compressor kicking on and off. For ever cycle between -1 to 3 on bank 2, bank 1 when through...

I’ve stayed the plenum with brake cleaner and didn’t see any rise in rpm. That dang fuel trim is crazy. I can’t comprehend anything that would’ve the fuel adjust 2-3x more often then the other side except a partially bad injector. Since the O2 reads all 4 on that bank, one cylinder rich/lean...

Also, even with a vacuum leak on one side, wouldn’t I get a consistent fuel trim but just a richer percentage to compensate for the additional air?

How would I diagnose a vacuum leak on the intake manifold? Smoke test?

Wouldn’t a vacuum leak effect both banks? It’s only one side of the engine to me whose is what is so strange. I don’t think the pcv is serviceable on my truck.

O2 fuel trims were bouncing around consistant with the trim on both banks.

Got my 5.4 3V replaced a couple months back due to a dropped valve. Since I got it back, I’ve had a rough idle, a little shutter in drive when I let off the brake and then it runs great. I’ve used numerous code readers and scanner and there are no active codes. Just left the engine builder...

Originally Posted By: Trav If something broke it is a blocked/locked engine not a seized engine, there is a difference. Think of an unmounted electric motor that has something blocking it from turning, when power is applied it will try and torque the whole motor but seize the stator and field...

Originally Posted By: dan_erickson Pretty normal for those 3v junks. Same thing happened to my old managers F-150 The more I read, the more that appears to be the case. Sounds like the plastic timing chain tensioner and guidesbite the bullet and then send plastic up the oil pump. The sad...

It tries to to click 3 times and give the engine block a little side to side bounce. The 2009 f150’s engage the starter 3 times. The truck still rolled freely in gear after it froze. The only thing in the driveline that could it it except engine would be the flexplate right? The lead rebuilder...

Originally Posted By: PReal Already at the shop. It’s had a steady dose of castrol, pennzoil, or mobil 1. Typically 0w20, 5w20 or 0w30.