R320. CD1 tickover

MarkF

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ML 270CDi
This stunning car arrived last September. Now ever since I got it the tickover has always been around 800/900 rpm in or out of gear. Just of late it's got a mind of its own, sometimes it will drop to around 600/700rpm, still nice and smooth. Other times it will start at the 800rpm and then after a short drive, stop at a junction and it will suddenly drop to 600/700.
Just wondering if I have. Sensor on its way out, could a man sensor cause this.

Any ideas?
 
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MarkF

MarkF

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No Dash lights and it drives just fine, no loss of power nothing just the revs drop.

I assume that the normal tickover rpm for a 320CDi V6 engine is 800/900rpm.
 

KennyN

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BMW 440i, Cayenne, ZX12r / ZRX11 / ZRX Monoshock
I assume that the normal tickover rpm for a 320CDi V6 engine is 800/900rpm.

On my V6 CLS diesel the car idles at 600 rpm , when just started it will sit at 800 until it is various monitoring sensors are happy, then drop to 600.

The time it takes to drop to 600 varies , dependent on ambient temp , load on the electrics , how much charge is in the battery.

I replaced the battery last year and the time for the initial revs to drop reduced considerably.

Kenny
 
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MarkF

MarkF

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ML 270CDi
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Oh thanks for this, appears then that mine has been constantly high rpm from day one.
Interesting what you said about the battery as the last few weeks I have had a glow plug issue, light stays on and in a cold morning not that it gets that cold here I have given it two to three pre heats before turning the key to start. I wonder if it's taking its toll on the battery? Need to get it to the indi soon as I get chance to sort glow plug issue, will ask him to check.

Many thanks.
 
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