Join Date: Jun 2007
Location: Sheffield, south Yorkshire, UK
Re: Dancing rev counter/engine revving up and down on its own
Mine does the same thing. I drive alot in crawling traffic but find that when I do put my boot down it tends to stick and idle at 1500rpm for a while. If I switch off and back in it sorts it for a while, when I satrt it the rev needle bounces around. If I set off before it stabilises it cuts out when I dip the clutch. I am fortunate enough to work with an ex-ford mechanic who told me to clean out the idle speed control valve, which he did for my. This cured for a good few months. However, I have just gone to do it myself today, my Haynes manual showed me a different part to the one he cleaned out. I called the ford guy and he told me to clean out the small valve at the front of the engine. Done it today (it was clogged up with oil and crap) and it's running like a new 'un again. Don't think it is the Idle speed Control Valve though like he said it was, more like a PCV valve. On the 1.8, facing the engine, at the front, slightly to the right and below the exhaust manifold there is a short rubber hose with a right angle in it going into a small cylindrical metal pipe surrounded by a large round rubber grommet. Pull of the pipe, pull out the valve (no bolts) and give a good cleaning, mine was caked up with oil residue. Disconnect the battery for half an hour, re-connect it and let the engine idle for half an hour. Then take it on a progressive drive (starting with slight revs and building up over a couple of miles) should have it singing in tune again.