V40: For your viewing pleasure my lumpy running V40

[malteser]

Originally Posted by gatos

Fair point. In that case Neil, ask Malteser if he still has the spare ECT I've sent him. If he has it, he can bring it along with the rest of the stuff so you can try it out...

Temp sensor could make sense

I'll bring it along anyway so Neil can try it out.

[Neil H]

Yeah Alex it very very rarely makes and difference unpluggin the VVT solenoid, i just managed to catch it this time, thanks guys, I'm off to do some more cleaning in the rain

Thanks Malteser !

[Neil H]

http://i.imgur.com/QnKxwd8.png

Which sensor am i looking for number 1, 11 or both ?

I thinking to remove it and clean it/them because there may be remnants of oil gunk in the water system from when my oil cooler failed and leaked oil into the water.

I will give the cooling system another flush too.

[gatos]

The above diagram is for the GDI car cars.

See DWM's excellent guide here: http://www.volvoforums.org.uk/showthread.php?t=136848

[Neil H]

Originally Posted by gatos

The above diagram is for the GDI car cars.

See DWM's excellent guide here: http://www.volvoforums.org.uk/showthread.php?t=136848

Ah cool thanks !

[KBB]

If you can get it on vida look at freeze frame data and live data especially coolant temp and fuel trims at idle and load can reveal a lot about what is going on.

[Neil H]

Originally Posted by KBB

If you can get it on vida look at freeze frame data and live data especially coolant temp and fuel trims at idle and load can reveal a lot about what is going on.

Thanks KBB, I would have to take a trip back to Gatos' to do that and in its current state i don't think it will make it that far without a lot of risk breaking down entirely so i'll have to try the other suggestions first and hope i get some improvements.

[gatos]

Originally Posted by KBB

If you can get it on vida look at freeze frame data and live data especially coolant temp and fuel trims at idle and load can reveal a lot about what is going on.

We looked at some of the live data with my DICE, but at the time, I didn't think of checking the ECT readings. How do I check the fuel trims at idle and how do I know if it is ok or not?

I will be going to Heathrow next Sunday, so I could pass by and try again with my VIDA

[KBB]

In live data select for graphing mode ECT, MAF, Long term fuel trim(LTFT) Short term fuel trim (STFT), ignition timing and throttle position value.

Long term fuel trim should be close to 0 it is expressed as a +-%, its a measure of how much the ECU has had to correct baseline fuel injection. If you see a value of +20% then the correction factor has been 20% more fuel injected than the ECUs base line calculation from the various input sensors. A negative number means the ECUs baseline calculation if over fuelling and fuel ins now being taken away. Lon term lets us know what has been happening over time and is committed to the ECUs memory after shut-down.

STFT is the immediate reaction at the O2 sensor, again the value should be 0 at best worst +- 5%. understanding fuel trims open a new window of diagnosing faults. e.g. if at idle STFT was +30% this means the system is lean, if I take the engine to 1500rpm and the trims fall back to +15% and again at 2500rpm were at +5% under load it got better but at idle it was lean means I'm looking for an air leak.

The is a whole lot of other faults trims can reveal too much to explain here list here. If the OP is confident with a DVM then the is a lot of simple testing on sensors that can give a clearer picture of what is happening. Happy to post some direction if the need is felt, its cost nothing and dose not involve changing parts.

[Neil H]

Originally Posted by gatos

I will be going to Heathrow next Sunday, so I could pass by and try again with my VIDA

Thanks thats very kind of you! I'm working next Sunday but if you feel like stopping by in central London (Great Portland Street) i could limp it to work and duck out and meet you for a while - No worries if its too much of a pain for you, you have been more than helpful to me and i really appreciate it!

Cheers!

Neil