Erratic running when cold and during warming-up period

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karoliens
Posts: 37
Joined: 12 Dec 2012 05:50 pm

Erratic running when cold and during warming-up period

Post by karoliens » 06 Jan 2013 02:05 pm

Hello,

So according to manual I should check:

auxilary air valve;
N.T.C. air mass meter;
inductuion system, air leakage.

My auxilary air valve looks like this when -2°C:
Image

And fully closes when engine is warm.

So could someone confirm that auxilary air valve is working and I can move to the next step? I also know that it can be adjusted with that 7mm bolt. When cold what RPM it should be when started? Engine is 2.0 injection.

karoliens
Posts: 37
Joined: 12 Dec 2012 05:50 pm

Re: Erratic running when cold and during warming-up period

Post by karoliens » 06 Jan 2013 02:59 pm

N.T.C. air mass meter looks OK. It shows 50ohms at 20°C. Checked for air leakage and everything seems fine no cracked hoses. But one vacuum hose is blocked with bolt. Should it be connected somewhere?
Image

It comes from two nipples connection from engine head. You could see it through 1st and 2nd cylinder inlet manifold gap:
Image

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volvodspec
Posts: 1921
Joined: 06 Dec 2008 09:35 pm
Location: Netherlands.
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Re: Erratic running when cold and during warming-up period

Post by volvodspec » 06 Jan 2013 05:34 pm

that blocked hose is for the EGR, the valve that is near that

i would suggest you check if the cold-start injector is leaking, spray around the inlet manifold with brake cleaner or similar flammable substance to check for air leaks when cold
there's a steel pipe on top of the inlet manifold wich is also for the EGR, that can be leaking too

karoliens
Posts: 37
Joined: 12 Dec 2012 05:50 pm

Re: Erratic running when cold and during warming-up period

Post by karoliens » 06 Jan 2013 08:14 pm

Where EGR is located. Perhaps you have a photo? Because I can't see any loose nipples.Yes my next check is 5th injector.

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