When starting my car from cold , the choke afect comes on and normaly cuts off as soon as the engine is warm enough.
Over the last few days it has bee started from cold, but the choke afect is still on even when up to full temp,its simular to a regen, turn off , restart and revs are back to the normal 800, is there a problem with the car, or could it have somthing to do with the cheat fix????

Just stopped and started it a few times , when starting the revs stick at 1000, turn off they drop back when restarted

 

no warning lights showing

It sounds like a regen. If it started to regen stopping and restarting the engine will stop it, but it'll try again. It'll also tell you to stay in lower gears. While the car is rolling it holds the revs at around 1000 even with the clutch down, so that can confuse things too. I'd get it scanned and look particularly for spurious DPF pressure readings.

And fan on the radiator will be spinning plus you shold smell burn rubber

Mines is doing the same I think it all to do with the ambient temperature outside (Baltic) as it defo not a regen on mineas under a quarter of a tank..

Its not a regen,, checked out another post regarding oil temp, first run today 16 miles, still at 1000, when I got to my destination , oil temp 75 , oil temp did not get to 90 until 15 miles, when slowing down from 60 to 30 , it dropped down to 86, it was minus 2.5 outside, once the temp rose to plus 4 it stopped and started as normal idling at 800

Yep, a common question on here at this time of the year.

 

The Superb likes to increase its idle RPM when it is particularly cold outside and the Climatronic is either asking for heat inside the car or the demand on the battery is high (heated rear screen, headlights etc.)

 

The coolant temperature gauge can be a bit misleading, for the large part my RPM returns to normal once it reaches 90 degrees, however sometimes it doesn't. Only after several more miles do things return to normal.

The coolant temperature gauge on the dash is basically an idiot light rather than a proper gauge. It'll read bang on 90 for real temperatures between about 75 and 105 *C. If you want an accurate indication of engine temperature, check the oil temperature readout on the MFD.

 

The car won't attempt a regen until the engine is properly up to temperature.

Does it raise the tickover till the cylinder temperatures are good for the compression ignition diesel needs?

The engine couldn't start if compression ignition conditions couldn't be created from cold. Thermodynamic efficiency would be higher if the engine was cold all the time, but the oil viscosity and assembly tolerances are designed to run at about 90 degrees Celcius because apart from the most extreme winter conditions, the engine can't be kept any colder without much more expensive thermal management.

 

As far as I know, the engine will run extra fuel for a while after startup to get things to temperature more quickly. The CR engines have louvres between the radiator and the engine to reduce air flow to the engine in cold conditions to get it to temperature quickly too, so my current CR engine gets to temperature much more quickly than the PD engine I had before it.

Just been trying a few things. Found that turning off the heating giving a quick rev , returns to revs back to 800, turning on the heating the revs go up to 1000, once temperature at 90 it sits at 800

Turning on the heating "should" not make the difference in revs that you get once warm. It never has to me. Any extra load on the engine also should only result in more fuel not revs.

I tried it this morning too. Cold engine, exterior temperature 5 degrees Celcius.

 

Climatronic on = 1,000rpm.

 

Hit the 'OFF' button it drops back to normal, hit the 'AUTO' button and it picks back up to 1,000rpm again.

 

Once the engine is up to temperature the rpm is not affected by the Climatronic.

 

This confirms to me the higher rpm is to speed up engine warming to allow the heating system to be able to offer cabin heat quicker.

It did it most of tonight,, I have just got in, minus 3 outside  , got out the car and the fans where on ???? started it up again the fans went off, ???????  , any further ideas, before I take it to a dealer, could it be the water pump as I checked the expansion bottle and the level was up over the max

Edited 24 November, 20169 yr by skippy41

Probably because Auto engages the AC even though it's not needed, try it with ECO instead and see if the revs rise?

?

How many miles has your car done, and was the Fix done while the car was in for a service?

Who topped the coolant up to over the MAX?  

Was that a Technician servicing the car?

Do you know when it was between MIN & MAX last?

 

As to the other behaviour it sounds perfectly normal for the temperatures in the last week or so in your area.

5 miles to get an indicated 50*oC Oil temp, 10 miles to get to 80*oC indicated and as much as 20 miles to get to around 90*oC oil temp and going above or below 

depending on the Load / Road speed when the ambient temp is around 0*oC or less.

 

Vehicle charging battery up, anti stall as you stop,

and Stop / Start not available due to Ambient Temp or if the A/C is on if the Ambient Temp allows it to be.

 

PS

It was a lovely -7*oC or so earlier on coming north by Carter Bar.

Edited 24 November, 20169 yr by Offski

?

How many miles has your car done, and was the Fix done while the car was in for a service?

Who topped the coolant up to over the MAX?  

Was that a Technician servicing the car?

Do you know when it was between MIN & MAX last?

 

As to the other behaviour it sounds perfectly normal for the temperatures in the last week or so in your area.

5 miles to get an indicated 50*oC Oil temp, 10 miles to get to 80*oC indicated and as much as 20 miles to get to around 90*oC oil temp and going above or below 

depending on the Load / Road speed when the ambient temp is around 0*oC or less.

 

Vehicle charging battery up, anti stall as you stop,

and Stop / Start not available due to Ambient Temp or if the A/C is on if the Ambient Temp allows it to be.

 

PS

It was a lovely -7*oC or so earlier on coming north by Carter Bar.

 

all levels are checked daily ,it was serviced last Tuesday, coolant level in-between both marks when cold

That is good then, because that is why there is no 'Fill to this level' mark.

The car gets shot of too much Coolant and sets its level, so if someone fills to MAX when cold they can expect to find it at between the marks when cold after having been up to operating temperature, often that is after getting home from a service where some fitter over filled the reservoir / Filler bottle.

It should stay there and not drop.  Even if someone in sales or the service desk says 'They all do that'.

Had it checked for faults yesterday, mechanic has full VDS or what ever its called, gave it a full scan  nothing showing 

Skippy I am sure its just  increased revs for keeping battery at full charge in the cold due to more demand on the system :thumbup:

^ this.