Silly question alert - TD4 tick-over

Sorry, but, what does your Td4 tick-over at?

is 850 rpm (warm tick over) correct or high?

Cheers in anticipation.....

CB40 said:

Sorry, but, what does your TD4 tick-over at?

is 850 rpm (warm tick over) correct or high?

Cheers in anticipation.....

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Not a silly question at all.

The tick-over speed is controlled by the ECU and is the same irrespective of whether the engine is warm, hot or cold.

The correct speed is 780 rpm + or - 30.

So your's is too high by 40rpm.

Whether this is something to worry about I don't know - but someone will be along soon to tell us whether to worry or not - or even to set it alight.

Singvogel.

Hi ,idle rpm does increase , if any load is placed on the battery eg heater fan ,lights, etc on mine anyway !

Ian jones said:

Hi ,idle rpm does increase , if any load is placed on the battery eg heater fan ,lights, etc on mine anyway !

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What happens with mine is that when I switch on headlights or heated screen, the voltage drops for a second and the revs go up a tiny amount and then it falls back to the normal idle speed.

I'm sure that these are tiny differences and are perfectly normal.

The OPs idle speed is outwith the 'normal' range though. Plus he was asking about warm,or cold etc.

S.

The reason (in my ignorance) I specified 'warm' tick-over, is because, like has been confirmed, things like the HRW or the seat heaters, the fan motor etc etc does make the tick-over vary on the first few moments.

But once all that's happened and it's steadied down, then it seems to stabilise at what looks like 850rpm....

Don't know if that helps any?

"" but someone will be along soon to tell us ....... or even to set it alight.""

Singvogel.



Yes, I get a little annoyed by that unnecessary comment/attitude - Not all of us can afford Range Rovers!

Just for interest ... what is a tratter?

CB40 said:

"" but someone will be along soon to tell us ....... or even to set it alight.""

Singvogel.



Yes, I get a little annoyed by that unnecessary comment/attitude - Not all of us can afford Range Rovers!

Just for interest ... what is a tratter?

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i drives one

110woman said:

i drives one

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Yeah but you drives an all singing all dancing, modern comfy tratter

Never had or heard of this problem. It might be worth checking the throttle potentiometer voltages and check if it's all returning correctly.

Have you got your aircon on ?

Aircon tends to cause the biggest rise in idle rpm out of all the accessories.

Vissie said:

Have you got your aircon on ?

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No, not at start up.

I run it ocassionally (as recommended) but usually later in the journey when I've done a few miles.... having it re-gassed soon too!

Thanks for the help guys.

don't forget that when you've got the air directed to the screen (de-mist) and the fan on speed 4 the aircon comes on automatically to assist with the demisting....

cb40 - how do you know its running at 850? off the rev counter or have you had it connected to some diags kit?

markyzs180 said:

How do you know its running at 850? off the rev counter ....?

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Only off the rev counter...why are they inaccurate?

I have exact same problem have u sorted it

Leebarney said:

I have exact same problem have u sorted it

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After a service it seemed to sort itself out, perhaps I've got a good mechanic, LOL