Just thought i would let you know that i had a very erratic idle on my RS2 over the last 3 or 4 weeks, it used to happen before the engine had got up to full engine running temperature, so though i would take it off to have a look at it and found it was sooted up inside, no carbon/oil build up, just the soot. Had a look around on Google and found a few articles on cleaning also looked at new ones, OEM/Bosch ISV`s are shown at around £185, a none OEM is available on ebay at around £30. Anyway thought i would give it a clean first to see what the results were, so took it off of the car which took all of about three minutes a few sprays with carb cleaner and some shaking up with the cleaner inside and much black liquid coming out, I ran the cleaner though the ISV until it appeared to be clean and refitted it. Took it out and now drives once more as it should.
When the engine was warming up and i used to come to a junction and to idle, the revs would drop very low or the engine would cut out all together, now when coming to a stop it drops to 850rpm and holds, Im really pleased its such and easy and cheap fix.
You will see in the first picture that it doesnt take a lot to slow the ISV down, the rotary valve is only just covered in soot but you can see "contact" scraping marks on the valve, whereas on the second picture its totally clean.
When the engine was warming up and i used to come to a junction and to idle, the revs would drop very low or the engine would cut out all together, now when coming to a stop it drops to 850rpm and holds, Im really pleased its such and easy and cheap fix.
You will see in the first picture that it doesnt take a lot to slow the ISV down, the rotary valve is only just covered in soot but you can see "contact" scraping marks on the valve, whereas on the second picture its totally clean.
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