Running rich (both banks) 3.2

[chitownV]

To sum up

-High fuel pressure seen at startup.
-Efficiency code which might be slow secondary O2 on bank 2. Sounds to me like the heating element is broken and relying on exhaust heat, but can still read O2.
-Rich on both banks
-Smoke test didn't show any leaks
FPR, MAF, and PCV were done

Thats, the current info? Yeah, live graph behavior could help to see when the primaries are picking up the rich condition, like if it's all rpms, on load, higher rpms, etc.

IIRC, you can check the fuel pressure manually with a gauge (edited). On the opposite side of the FPR on the end of the rail, there is a plastic cover that unscrews to reveal the schrader valve.

[pgill]

And fuel pressure seemed to be too high at startup. Like 72 psi.

The high pressure at startup is by design.

The extra pressure allows for better atomization of the cold fuel.

For my LR2 3.2 the pressure stays high (61 PSI) until after the ECU switches from a high idle to a low idle. I think that it drops to 55 PSI in less than 30 seconds from the starter turning.

I can find the section in the Land Rover Shop manual that describes this if you want more information.


Thanks

Paul

[pgill]

Replaced MAF, PCV, fuel pressure sensor on the rail
Lean conditions bank one and two.

I am not sure based on your post if you have a:
Vacuum leak (unmetered air)
or
Excess fuel.

The fuel trim will tell you this

Positive Long Term Fuel Trim = Vacuum leak / unmetered air entering the system

Negative Long Term Fuel Trim = extra fuel entering the engine (the purge valve could do this)

Lets assume that you engine is Running Lean due to a Vacuum leak / Unmetered air and it is Adjusting the fuel trim to add fuel (Rich adjustment)

For a running Lean due to a Vacuum leak I would check the following

1. The six intake manifold gaskets could fail which would create a vacuum leak

2. The gaskets for the intake runners (there are 2) could fail and create a vacuum leak

3. The gasket at the throttle valve could fail and create a vacuum leak

4. The small hose from the purge valve could fail and create a vacuum leak

5. The intake tube has a sound attenuating box that can leak. This is technically unmetered air and not a vacuum leak. If you disconnect the MAF and just use the MAP to run the engine and the LTFT gets back to normal then this is where I would look.

Intake Manifold gasket (Intake runner and Throttle are similar but larger)


Purge Valve Hose (small hose between Valve and manifold is under Vacuum at idle)


Intake tube sound attenuator boxes (if the box or seal fail it will allow for unmetered air to enter the engine) ignore the arrows they are point at the clamps the hold the intake tube to the the throttle body and the air box



Good luck

Paul

[chitownV]

So smoke test, nothing. Completely clear. Mileage is 142k.

Paul, that's a lot of good info. I believe Holcombehas6 had a smoke test done to check for vacuum and intake leaks. None found.