Idles rough in drive,runs good on open road,noticed while idleing if i open oil fill cap if goes pufffffff like relieving pressure,should it build pressure in the motor like that,i put new plug wires,new...
All automatic ZX2's have a rough idle in gear. Ford even put out a TSB and tried to fix it with no success. The engine is internally balanced and does not have a harmonic dampener. This means you get all of the engine vibration transferred to the frame. I own three ZX2's, my sister has one, my friend has two, they all have rough idle in drive.
The noise you get from the oil filler is normal to an extent. It is an overhead cam engine so you will hear noise from the oil filler. The oil you see on the spark plugs is likely from the valve cover gasket. That is the only place the oil can come from and get onto the top of the spark plugs. It can't travel through the spark plug threads and get on top from the combustion chamber.
It is good you replaced the PCV valve (I know it is hard to reach) but did you replace the breather? There is a round black box with a hose coming from the intake that goes onto the top of the valve cover. This is the air inlet for the PCV and if it gets clogged it will allow pressure to build up in the crank case.
Mar 04, 2011 |
2003 Ford ZX2