Originally Posted by 00texaszx2
have you changed out the pcv valve i know its different but i had something similar on my escort zetec, however my problem was with oil and the pcv valve fixed it not only that the valve is only like two bucks.could be clogged and causing back pressure.
Yeah the PCV was changed out (clogged up and dirty but was still shaking). We also found a gaping hole in the Vacuum hose that runs from the PCV valve to the back of the intake manifold under the throttle body. The bend (elbow) in the hose just before the throttle body connection has a gaping vacuum leak, maybe caused by hot oil coming from the PCV? The symptom was when you revved up the engine it took 30-40 seconds for it to go back down to idle speed (under 1000) as it was sucking air. This happened when you drove it too. Here is a post on the same issue: http://www.justanswer.com/ford/5kwht...-throttle.html
The previous owner thought it was a throttle cable issue, but we heard the hissing and a mechanic found the hole. But none of this had anything to do with the coolant leak from the valve head (under the valve cover).
2000 Ford Focus Zetec 2.0L, blue, 3 door, automatic, lots of miles. "If something cannot go on forever, it will stop," Herbert Stein.
Last edited by CitizenPete; 04-19-2012 at 11:34 PM.