Vehicle & Technical > Discovery

V8 astronomical fuel usage

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ibruceuk:
Hi,

yeah I've cleaned the sponge thing, (well replaced it), but there is still a vacuum, but this may be quite normal, anyone able to check?

I'll try adjusting the timing, but the engine seems to have plenty of power, and the EFi has no lambda's so it wouldn't get feedback about overfuelling, it would just run on the Non-Cat map as according to the tune resistor.

I'm gonna try and check the injectors this weekend, but from what I can see of the LPG system it only kills the injectors so the fuel rail stays pressurised so it can't be a leaky injector.

The timing is BTDC, I too would have thought the CO would be lower on LPG, but I can't weaken it anymore, but this may be related to the high crankcase vacuum...

Range Rover Blues:
You have to change that timing before you damage your engine.  Over-advancing will make it much harder to start too.

YOu could have a leaky injector, that bit about waiting for it to start, well the fuel pump primes every time you turn on the ignition then cuts out untill the engine is running.

Are all your spark plugs the same colour?

Budgie:
It could also be related to the timing. If it's taking in more fuel than it can burn then the excess will go out of the exhaust and register as high CO, same as on petrol.

By altering the timing you're compressing the gasses that little bit more and giving a better burn rate when the spark fires. You may not notice any increase in power from the engine but it should use less fuel and burn it cleaner.

Just to confirm about the second breather, it's at the front of the  righthand rocker cover, where the oil filler is on the left bank, and has pipe coming off the top of it into the inlet manifold and looks like this. It's got like wire wool inside and can clog up.  :wink:

Range Rover Blues:
Just re-reading some of this.  If it had cats id had lambda sensors, have thse gone too? if so you need to change the tune select resistor to tell the ECU they are missing.  Your car may just be in limp home mode.

On a 93 that must be a hot-wire EFi right?

A very slight vaccum is a sign of a good engine, it's there to protect the seals on the carnk and prevent any oil fumes escaping, they should all be burned by the engine.  Check that the pil fume pipes on the front of the plenum are all ok thoough, one of them has a very narrow bore inside.

ibruceuk:
You're right, it did have lambdas but I removed them along with the cats but I did change the tune resistor to the Green one when I did this.

I can't seem to remove the flame trap on the right hand rocker cover, can someone just confirm that this does just unscrew, I don't want to apply too much pressure if this isn't correct.

The pipes are clear, I cleaned them a few weeks ago.  I'm wondering if the previous owner who installed the LPG may have screwed something up and possibly joined both banks of injectors together, i'll try and check that tonight.

and yes it's hotwire.

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