Vehicle & Technical > Range Rover

low rev stutters, p38 4.0

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Range Rover Blues:
Starts ok, runs fine, economical, doesn't use water,

turn the radio up and forget about it ;)

thermidorthelobster:
The air flow meter doesn't explain the noise, but it could feasibly lead to the other symptoms - it sounds a bit like what my 4.6 did when there were intermittent faults with the MAF and the crank sensor.

woz:
 I have read some online stuff about the MAF sensor, that was my next course of action giving that a good clean.
Keep you posted.
Failing that, keep the stereo on full blast!! :dance:
Thanks for the advice tho, much appreciated.
Woz

Range Rover Blues:
I've been doing a bit of reading.

I'm not sure just how accurate this is with your engine management but:

At start up the engine will run on a default fuel map, running rich, to start
at idle the engine will look at a MAF signal and runn slightly rich depending on engine temp
at higher revs/under load the engine will look at the lambda signal.  it may also adjust the base idle setting depending on lambda feedback, THE RRC does this if lambdas are fitted
At wide open throttle the engine runs rich to giev more power and protect the engine from excessive pre-ignition etc, this is based on a fuel map too.

So the engine runs closed loop between about 10% and 90% throttle (varies depending on manufacturer and emissions regs).

So a faulty MAF would affect the idle more than the running mixture.

thermidorthelobster:
On the 4.6 I had problems with both the idle and the mid-range under load.  I don't however know which was to do with the MAF and which was to do with the crank sensor.

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