1.6 TDi CR Engine Idle Speed

[rji]

Can someone clarify the correct engine idle speeds.

Mine appears to be:
Exactly 750 rpm - Engine hot, car stationary
Exactly 900 rpm - Engine hot, car moving

But - before the engine is hot the idle is almost 1,000 rpm and does not drop to 750 rpm when stationary. Even after the engine appears to be hot it is a very long time before the idle speed drops to 750 rpm. Is this normal. Does almost 1,000 rpm mean its doing a regen, it seems to do it too often and for too long.

 

[Biker]

I don't think you have anything to worry about, my car is doing much the same as yours. It is idling at 1000rpm most of the time these days. On my normal journey to work, about six miles, it is still not up to temperature when I get there and is still idling at 1000rpm.

All down to this cold weather I think.

 

[Peapod]

Mine does exactly the same.

 

[JonnyT30]

I believe that if the engine is not up to temp and you have the heater switched on, it will keep the tickover at 1000rpm until the engine temp reaches the correct level.
Just a quick one for you dpf peeps, it seem to me that the car won't do a regen if the fuel light is on. And if the dpf light is on, and your fuel light comes on, it will abandon the regen but leave the dpf light on permanently until you re-fuel then it will continue the regen. Subsequently this can leave you driving around pointlessly trying to clear the dpf, so avoid driving around with the fuel light on.

 

[Deleted member 55317]

my old TDCI fiesta's tick over speed raised by about 200-300 rpm when I turned the AC on no matter how hot it was or how long the engine had been running.

 

[rji]

Today it all changed.

It has always taken a very long time for idle to drop to 750rpm. I've noticed that even a 20 miles continuous drive might not be enough.

But today it had a very short run and then was stopped for over 1 hour. When I restarted it the engine must have been cold, the cabin heater was blowing cold and the engine idle was 750rpm immediately. Then drove 40 miles, left it for over 2 hours and when restarted the idle was 750rpm. Then after less than 10 minutes I stopped at a roundabout and the idle was up to almost 1000rpm. So now I don't how the ecu is deciding on the idle speed.

 

[farrar]

It has always taken a very long time for idle to drop to 750rpm. I've noticed that even a 20 miles continuous drive might not be enough.

Thats normal in cold weather. It can take a long time to warm up unless you are driving at high speed.

Then after less than 10 minutes I stopped at a roundabout and the idle was up to almost 1000rpm. So now I don't how the ecu is deciding on the idle speed.

It sounds like it was running a regeneration cycle at that point.

 

[Feeney123]

I got mine around a week ago now and im idleing about 800 but doesnt take time to drop. after a while it will probably go up mind, i dont know why like?

 

[Beenz]

I got mine last September, normal idle speed about 750, in the cold its up to 1K until warm then about 1100 and lumpy tickover on a regen.