Originally Posted by Paul1958
How many miles?
How long has been problem?
How long since last ignition service (plugs/wires/coil)?
How long since O2 sensors replaced.
How long since TB/MAF cleaned?
ST/LTFTs < +/-10 = normal
Doesnt like closed loop
Have you looked at live data to see that the O2 sensors are cycling normally in closed loop?
I should have included all that.
01 zetec zx3
Problem has been a couple of weeks now.
Wires, coil, and plugs have ~10k and look great.
Valve cover is good and under 10k since replaced.
Pcv, air filer, vacuum lines, ff, pcv hoses all new.
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