System too lean errors P0171 and p0174 (1 Viewer)

[studio19atx]

I was getting knock sensor code for new knock sensors, I swapped the sensors to see if it was the harness or the actual sensor.

Now getting system too lean on both banks

Any pointers?

 

[Malleus]

Knock sensors don't have any direct relationship to A/F mixtures. It sounds like you have a harness problem, at best, or an ECM problem at worst.

 

[studio19atx]

Knock sensors don't have any direct relationship to A/F mixtures. It sounds like you have a harness problem, at best, or an ECM problem at worst.

I am wondering if there is anything I didn’t put together correctly.

Anything to check? I am suspecting vacuum leak or return fuel line.

 

[Mauser]

I'd run a smoke test for vacuum leaks.

 

[studio19atx]

I'd run a smoke test for vacuum leaks.

Will do. Thank you

 

[ftbshop]

I’m finding after my starter was replaced that disturbing the vacuum lines while removing the intake manifold has cracked a few of them. Check anything vacuum you removed to do the knock sensors.

 

[studio19atx]

I found this unconnected tube behind the engine compartment. Any pointers where it is supposed be connected?

 

[studio19atx]

 

[Malleus]

 

[studio19atx]

, I don’t see unplugged connector, tube coming out from near the bell housing

 

[Malleus]

Near the bellhousing, or behind it? There are transmission vents there; I can't remember where they terminate. It may not be that, but that's the first thing that comes to mind. I can look at mine, but it may be a while.

 

[studio19atx]

Near the bellhousing, or behind it? There are transmission vents there; I can't remember where they terminate. It may not be that, but that's the first thing that comes to mind. I can look at mine, but it may be a while.

It’s near the bell housing. I imagined it might be transmission vent but it also looks like it was terminated before.