Bad Fuel Economy

**tailslide** · 17th September 2011, 10:35 AM

I have also been down this path chasing a Fueling Adaptation Out Of Range error.

My 99 D2 is currently at 267,000 km and I first replaced the MAF as the output was a bit low compared to others on here. Then I replaced the O2 sensors as that is the other side of the fueling control circuit, but without any success.

I am now experiencing a rough idle when warm (slow idle) and things are pointing towards a worn cam shaft and/or valves...

My advise is to get the engine codes read to see if something is going on before replacing parts that may be in good condition.

Cheers
Ron

**disco_disco** · 17th September 2011, 10:46 AM

Thanks for the advice i might take you up on that .

As far as i know it wouldn't be the camshaft or valves as the engine was rebuilt about 10 months ago and all was fine then when inspected.

**jiri_j** · 19th September 2011, 10:21 AM

I had a same problem - increased consumption by 15 % like from a day to day. My advice is:

1) check the codes
2) using a OBD2 scan tool, look at the values of long term fuel trim. If your MAF is not working properly, you will see increased values. Ideally you should have 0% on both banks. BTW if the value is less than 25% you won't get any code

3) you can test O2 sensors using an OBD2 tool as well - the readings at idle should oscilate between ~0.1V to ~0.9V at a frequency of 0.5Hz.

In my case I had LTFT values of +/- 11% on both banks and a new genuine MAF solved the problem... For your reference, the MAF values should be 20+/-3 kg/h at idle and 60+/-3 kg/h at 2500rpm (source: RAVE, my readings fit within these numbers after installing the new MAF)

Cheers Jiri

**disco_disco** · 19th September 2011, 11:28 AM

sweet as thanks mate . i think i'll hit up RON who has offered his Hawkeye

**tailslide** · 19th September 2011, 08:44 PM

No problem, PM sent.

**disco_disco** · 20th September 2011, 07:56 AM

Is this the correct MAF Sensor ??
MASS AIR FLOW SENSOR LANDROVER DISCOVERY 0280217532 | eBay

It'sNotWorthComplaining! · 20th September 2011, 10:49 AM

Originally Posted by disco_disco

Is this the correct MAF Sensor ??
MASS AIR FLOW SENSOR LANDROVER DISCOVERY 0280217532 | eBay

Just check where these mafs are made brand etc , just because it's a UK seller does not mean they are selling UK made mafs. A lot of them buy cheap Chinese made fuel components to resell from the UK

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