Hi, have a ford mondeo mk 4 2008. ,most times it starts ok but every now and again it fails to fire up sraight away, onc e this happens then it becomes quite hard to start, the engine will turn over but not fire up,afer a few goes it will start, although seems reluctantly. .Have had the batter checked and confirmed as ok and a new starter motor motor fitted but still the same , anyone any ideas please, car has coverded 91 k

Petrol or electric?

Engine size?

Last time the glow plugs/spark plugs were changed?

Last time fuel filter was changed?

It's a bit hard to suggest solutions without at least the 1st 2 items mate.

12 hours ago, 1979Damian said:

Petrol or electric?

Engine size?

Last time the glow plugs/spark plugs were changed?

Last time fuel filter was changed?

It's a bit hard to suggest solutions without at least the 1st 2 items mate.

ok sorry it is a 1.8 diesel, dont know re glow plugs as i have not owned it for long , hope that helps

On 13/11/2016 at 8:54 PM, robdalej said:

every now and again it fails to fire up sraight away, onc e this happens then it becomes quite hard to start, the engine will turn over but not fire up,afer a few goes it will start, although seems reluctantly.

Maybe air is getting into the fuel system. Usually (certainly on the Focus), there is no tank pump, the main pump has to suck fuel through, and it is very bad if any air gets into it. Cracks or leaks in the pipes up to the main pump, or in the filter housing, the filter vent valve or the sealing ring on the filter are all suspects. A clogged filter would make this problem worse.

These engines should start ok without glowplugs, at least down to freezing. They just run a bit rough for a while.