Uneven Idle

[Dad Racer]

Where would I find these non-return valves on an N reg 850 T5? The idling rpm is sometimes ok (950ish) and sometimes as high as 2000!!

How easy is it to inspect/ replace the vac hoses? Getting annoyed with the car now, especially with the warm weather, high idling rpm and failing of the aircon.

[SaffronC70]

Hi, sounds like you have a dirty idle control valve - small cylinder on the intake manifold, clean it with carb cleaner.

Chris

[Dad Racer]

Thanks for the info - just gave it a quick clean and just for a while, i thought that the problem was solved!!!

When working, the revs idle at about 950 and don't move much even when the aircon compressor kicks in. But as soon as the aircon starts blowing unconditioned air, the idle revs increase to about 13-1400rpm, sometimes as high as 2000. Turn the aircon off, and the revs drop down to about 1050...Confused?

I have had the aircon recharged + seals checked, but still the aircon blows cold air for about 2-3mins - revs normal, then as above...

[Dad Racer]

Think I may be getting closer. Discovered that the purge valve may be faulty. It clicks intermitently, which I believe is a sign that it is failing. The search continues.

[Nigel T5]

Time to join in here, after much faffing about Ive finally replaced the MAF sensor (bosch of course). But the idle is a bloody pain. I have the geartronic box and when in aprk and neutral smooth as a nut at 700 rpm. put it into Reverse or drive and the wobble starts between 800 - 600 up and down and up and down bloody annoying in traffic. Any ideas?
Oh yeah V70 T5 Phase2 2001 x plate.

[t5kev]

hi i have just run the problem past a mechanic at murry volvo edinburgh he recons its the electronic throtle module it costs roughly £40 FOR THEM TO DO IT AND THEY NEED TO REPLACE A SEAL AS WELL

[C70 GTT5]

do any of these cars have idle control valves? i had problems with these once on many different cars

[timbo_1975]

Can anyone help out, i've got a 2001 v70 t5 unmodded 85k on clock, its started to rev unevenly. only seems to do it on idle sits at around 700rpm then drops to 600 and bounces back up to 800, does it a couple of times before settling back at 700.
Have noticed that if i turn the air con off it seems to sort its self out and if stood outside you can hear a click from engine bay before revs go off on one.
Codes have been checked and theres nowt showing up.

cheers g

Classic ETM.