rover 75 surging power

[brakedust300]

i have a 75 cdt, when im driving the power delivery isnt very consistant, its as it the engine looses a few bhp then gets it back again, any ideas? im thinking maybe fuel filter? or maybe glow plugs?

[niva441]

I've not noticed this problem with my fathers. However it does surge in traffic when in drive with the handbrake on.

[350zwelgje]

The air metering unit is notorious on these (bmw) engines. You can disconnect it and see if it picks up again (it should, and will confirm that it is this part). Has the rover (cdti 133php) as a company car and the temporary fix until the part was available is to disconnect.... Made a huge difference, as it felt like having a working engine again. Replacement is not cheap, and you don't know how long it will last. Leaving it disconnected should not be an issue with this particular diesel engine (other diesels it could be a problem), and many drive with it disconnected. Don't know what will happen during mot-time ....

Rob

[niva441]

350zwelgje said:

Don't know what will happen during mot-time ....

Rob

Reconnect it until the MOT is done...

[brakedust300]

is that the mass air flow senser thing after the air filter?

[brakedust300]

is this the mass air flow sensor fitted after the airbox?

[niva441]

I've not checked on the Rover, every other car I've seen the MAF is after the filter. I suppose it doesn't harm to protect it from dirt.

[brakedust300]

sorry, i wasn't being clear there... is the air metering unit another word for the maf, or is it a different sensor?

[350zwelgje]

maf is the same as afm (air flow meter), and does the same as a air mass metering unit: just different names for the same thing to provide an ECU information of the amount of air entering the engine.

Location of maf: Standing in front of the car, opening the bonnet, the connector and the metering unit is hidden, at the left hand side, close to the scuttle, under the large cover. You need to take the cover off to be able to disconnect it.

Rob

[ssray]

Have a look here www.45zs.info/ Roveron is very helpful

[brakedust300]

cheers for all the help lads, disconected the MAF and she seems to be running fine!