Hi All,

 

I was having some low revs lagging issues once the engine was warm, it goes like stink when it is cold, even though you shouldnt.... anyway I was checking VCDS and noticed this

 

 

Speaking to some people the Consumption l/h figure should be 0.6 so mine is waaaaay out.

 

My torsion value (front cam) is 0.35 so that is fine, and the l/h figure so I believe is the rear cam timing. So just the rear cam needs setting.

 

Question is, am I right and how?

 

Also, the coolant outlet temp was 21 when i was driving abit it increased slowly on idle. The recommended mim is 75 according to the little box that comes up on VCDS. Do I have a problem? Initially I thought yes, but then the radiator outlet should be about ambient shouldnt it?

3.23 litres per hour certainly sounds high for fuel consumption on an idling diesel (Unless I've understood these figures wrongly). I think I would expect something like 0.7 l/h unless the engine was stone cold with every electrical device running.

 

Also when idling with an engine up to temp (Coolant temp 88 degrees according to your screen shot) I wouldn't expect the radiator to be efficient enough to drop the temp all the way to ambient or anywhere close, because at idle there is no air passing over it (Fan is only running at 10%). Of course I could be completely wrong here, but just doesn't seem to add up to me.

 

I wonder if you have a misreading temp sensor somewhere?

3.23 litres per hour certainly sounds high for fuel consumption on an idling diesel (Unless I've understood these figures wrongly). I think I would expect something like 0.7 l/h unless the engine was stone cold with every electrical device running.

 

Also when idling with an engine up to temp (Coolant temp 88 degrees according to your screen shot) I wouldn't expect the radiator to be efficient enough to drop the temp all the way to ambient or anywhere close, because at idle there is no air passing over it (Fan is only running at 10%). Of course I could be completely wrong here, but just doesn't seem to add up to me.

 

I wonder if you have a misreading temp sensor somewhere?

 

Its 0.6 ish is the figure i keep seeing I just dont know how to alter it.

 

The outlet coolant temp is cold, I assume because it was about 13 degrees and I had only stopped driving 5 seconds previously when i pulled up at home. If someone wlse with VCDS can see what this reads while they drive and let me know this will help. All the other temperature sensors I believe are reading right. Im not sure how to check them all, but I went up to group 99 last night and noting seemed amiss other than consumption and this temp which may well be OK.

Its 0.6 ish is the figure i keep seeing I just dont know how to alter it.

 

The outlet coolant temp is cold, I assume because it was about 13 degrees and I had only stopped driving 5 seconds previously when i pulled up at home. If someone wlse with VCDS can see what this reads while they drive and let me know this will help. All the other temperature sensors I believe are reading right. Im not sure how to check them all, but I went up to group 99 last night and noting seemed amiss other than consumption and this temp which may well be OK.

 

Ahh, OK, if you'd only just stopped driving then I guess 26 degrees could be about right, particularly if you had been driving steadily.

 

3.23 l/h is approx. 0.7 gallons per hour. IIRC your mpg from another thread is approx. 41, so idling your car for an hour would be the equivalent to driving around 28.7 miles which at 30mph would take you around an hour. These are just musings, but like I said, doesn't seem to add up.

I seem to remember previously reading about idle stabilisation values somewhere, but can't remember how you check these or what they would tell you. Maybe someone else can help with this?

Ahh, OK, if you'd only just stopped driving then I guess 26 degrees could be about right, particularly if you had been driving steadily.

 

3.23 l/h is approx. 0.7 gallons per hour. IIRC your mpg from another thread is approx. 41, so idling your car for an hour would be the equivalent to driving around 28.7 miles which at 30mph would take you around an hour. These are just musings, but like I said, doesn't seem to add up.

 

Sound slike you have your calculator out... but yes it is wrong I think. I might just alter the rear cam a bit and see what happens. (I will mark it first!!!)

 

It sthe idle stabilisation valies, I checked these too, they should add up to 0, mine do, although the range is -0.5 to +.5 I think. I think it is something like -0.45 +0.05 -0.16 +0.56 or something.