SCV valve? Actual pressure -3000kPa from Target

[robf300]

Just a quick one, did a few readings on my car from cold to warm:
At Cold:
The target common rail pressure is 35640
The actual common rail pressure is 32730

At Warm:
The target common rail pressure is 33400
The actual common rail pressure is 30600

It variates a bit but always seems to be about 3000 down...
Time for a new SCV? 2008 D4D

[StevenS]

That's about 435psi - which is about halfway towards what would be considered out of scope (+ or - 750+ psi)

I replaced my SCV that had roughly the same variance as yours and noticed no real change. It'll never be exact as the ECU's just aiming for the target pressure as an ideal under the conditions the engine has that very fraction of a second.

[robf300]

OK good, maybe for now i'll just hook it out and give a clean up, see what happens... Just got quoted $325 for a new one locally :/ Waiting on a call back from Baileys Diesel Group...

Cheers!

[robf300]

$198 + $33 freight from Baileys...

[rysermon]

is it worth cleaning the scv? where/how can you do it

[fourby4diesel]

From what I see, I would say that is pretty standard.
I would not replace it, unless you are having other issues. Running rough?

[robf300]

The car seemed to be running OK, maybe a bit down on power. It has been noisy in the cold with rattles/knocking since I've had the car.
I ended up pulling the SCV apart, found no obvious damage, and a small amount of dirty build up on the piston. Cleaned it up and reassembled and all seems OK. Maybe a bit quieter in the cold running.

Cheers for the help

[Talktheroo]

You need to do a cold start diagnostic, Rob.
Have a see where those injectors are, mate.
catch you later, John.