Thread: Love my Landy but well and truly over it ATM!

This may sound completely stupid, but it's not so ridiculous, being a Land Rover. When you got your 4.6 fitted (as I did) did the workshop fit a new Mass Air Flow sensor?

It's not well known, but if the MAF is out of spec, aside from rich/lean bank errors which can be seen via an OBDII scanner, the faulty MAF will also cause transmission errors.

Plug a scanner like ScanGauge II to your Disco and see if you pick up any rich/lean bank issues and if so, replace the MAF. It might (a long bow here!) possibly solve your transmission issues.

My understanding also is, that the "fuzzy logic" in your auto will take a while to learn your new torque spread etc.

Thanks guys,

Actually picked up a scanguage while it was off the road. Had it running all of 45 secs this morning before (and due to someone elses negligence), it shredded the second fan belt since Sat.

I'll keep an eye for the codes, I have a spare auto ecu to test tonight (after replacing belt). MAF codes look like P101-3, and 171-175 for rich/lean/A/B events.

Thanks again, let you know how it goes.

Originally Posted by clubagreenie

Thanks guys,

Actually picked up a scanguage while it was off the road. Had it running all of 45 secs this morning before (and due to someone elses negligence), it shredded the second fan belt since Sat.

I'll keep an eye for the codes, I have a spare auto ecu to test tonight (after replacing belt). MAF codes look like P101-3, and 171-175 for rich/lean/A/B events.

Thanks again, let you know how it goes.

the 4.0 and the 4.6 have the same MAFs, its the actual housing the MAF gose into thats diff, the 4.6 has a bigger housing,

Well it's throwing 171/174 errors (lean Bank 1/2) as well as 340 (cam position sensor signal fault).

Just to clarify, a larger MAF (more airflow) will fix lean errors, or are the lean errors just a fault of the MAF (therefore also causing auto errors).

As mentioned above, there is no "larger" MAF. Only one MAF, regardless of whether it's 4.0 or 4.6.

The crank position sensor is another sensor that will eventually fail. If it stops working, the engine will not start or run. Fortunately this sensor seems to have a long life span, and probably last aound 6 - 10 years.

So it's simply a failure of the MAF that causes the lean errors then? Either MAF should be OK flow wise given same airflow potential.

Something doesn't click here.

I think you're looking at a manifold leak on one cylinder bank. Probably a warped manifold or similar. You WON'T get lean on one side and not the other.
I suggest you pull the manifold and inspect the gasket on all inlet ports.