Hi My 1995 Mondeo,Zetec, has done 81000 miles, it had an new timing belt last year.
Recently it was pulling badly, seemed to get worse over a couple of months, so I put it in for a service at a local garage (not ford) and asked them to check for underpower problem.
They changed the plugs and said the HT lead 4 was arcing and I needed to replace the leads. They had sprayed the leads with WD40 as a temp fix.
However although the car was pulling much better after about 5 miles a random misfire occurred, doesn't seem to matter whether car is pulling hard or not.
I took it back to garage, they replaced Coil and thermostat which was stuck open.
I drove about 500 miles the following weekend and the problem did not occur, but a couple of days later after about 5 miles the misfire is back.
As a long shot when this starts to happen after about 5 miles, I turned the ignition off and on, low and behold the misfire is gone until the next time I start the car from cold.
So what's happening here, am I resetting the ecu or am I fooling it into thinking the car is just starting and providing a stronger petrol/air mixture,or something else.
I wonder if the Halfords leads I fitted are man enough and also if the plug gaps are too big (not checked them yet)
Any ideas anyone?
Thanks Roger