Ford Focus 1.6, 2001, Mk1 ? in the UK
When the engine is cold the car will start on the first turn of the key
? everytime. When running there are no problems at all, idle is smooth
as well is the acceleration or travelling in any gear. There is nothing
wrong with the battery ? its heavy duty and around a year old and the
engine turns over okay.
If the car is stopped after 2 minutes or 30 minutes or 2 hours then 1
percent of the time it will not restart again until the engine has fully
cooled down. The problem is getting progressively worse.
All symptoms suggest lack of fuel. The engine turns over but will not
catch. In the fault condition the fuel pump doesn't prime on the turn of
the key BUT when the engine has cooled down it will prime without
problems and the engine will again start on the first turn of the key.
While I cannot rule out a fuel pump I suspect something else is
inhibiting the pump from being started during these episodes
An OBDII diagnostic doesn't show any fault codes, even when the engine
will not start. Real time monitoring of engine temperature shows no over
heating. The fault can occur after the engine has only been running a
few minutes and hasn't reached the opening temperature of the
thermostat. The hottest the engine ever gets is 119C (the sensor doesn't
measure the water temperature but the temperature of the metal in the
head). The temperature sensor has also been recently replaced.
Also replaced recently as part of a general service are the spark plugs.
The relays associated with the fuel system have also been swapped. Most
(all) connectors in the engine bay have been separated and remade with
no apparent signs of burning or contamination. Hoses all seem to be
okay. There is no loss of coolant or oil.
A Google for the problem shows it isn't uncommon but most postings don't
show any satisfactory solution. Owners have spent a lot of money having
fuel pumps and filters replaced for the fault to re-appear a short time
Any sensible clues about what may be going wrong?
- posted 6 years ago