Freelander 1 TD4 auto - new Bosch maf - still not same like unplugged

Hi,

I was wondering if anyone has an idea. Had the engine on below 7l with good throttle response and good power uphill. Then it got worse, tested the MAF by unplugging and eventually changed it. Thanks for that.

Before the fuel con. went up to 12l, now it‘s down to 8.6 mixed, but the throttle response is still not the same as if unplugged the MAF. It‘s only uphill otherwise it‘s ok.

Are there any other signals running through that plug/wire which resp. what else is happening, when unplugging except for going into emergency as far as I understood it? Could it be the air temp sensor as it‘s located nearby?
Regards

I'm assuming you're talking about increased fuel consumption in litres per 100Km. We use MPG in the UK, so know little of this European way calculating fuel consumption.

Looking at the official figures, a TD4 manual should be somewhere between 6.7 and 9.1 L per 100Km.
There will always be differences in consumption as there are so many variables to consider. Things like engine condition, road type, weather conditions, traffic on the road, speeds being driven and vehicle weight all play a part in affecting consumption.
12 L per 100Km seems excessive, but not if the MAF is disconnected. The MAF signal plays a large part in limiting fuel into the engine.
Going from an old MAF to a new MAF will improve power, but at the expense of economy. Running without a MAF will give plenty of power, but fuel consumption suffers as a result.

There are 2 sensors in the MAF assembly. Both signals are needed for the EDC (ECU) to meter the fuel accurately. If no MAF signal is measured by the EDC, then fuel is supplied based on throttle position and boost pressure. So full demand by the driver and high boost, will give poor fuel economy, but lots of torque and black smoke too.

Sorry, Nodge, had started to write but somehow it seems not saving the drafts on my equipment anymore.
Yes, that per 100km. It was 41.5 mpg if I calculated it correctly before the maf died, went to 25 and now with the new one it‘s on 32.5mpg mixed.
The thing is that it was still much better unplugged, but also before the maf died and the throttle response now is very sluggish especially uphill compared to it as well.
My wife drove it as well and came to the same conclusion, much better before the maf died and unplugged as well.

Is the high boost demand regulated via the turbo boost solenoid? I thought if maybe the air inlet from the ‚normal‘ one to a silicone hose or back changed anything resp. if through the normal air would come in from around the hose?