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Discussion Starter · #1 ·
Have a real difficulty starting engine. The problem occurs only when the tank is half full of petrol, from cold, and increasingly gets more difficult to start, as petrol level drops lower. However, it will start first time, whatever the petrol level, if engine is warm. Fuel pressure issue, maybe?
 

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Super Moderator
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try this first, when you switch off at night, just as it starts to die press the throttle down fully, and it should make a funny noise as it dies.

if it starts fine the next day, it may be an egr issue.

What year is the car?
 

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Big Megger
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2,886 Posts
worth testing stat use diagnostic cylinder head temp http://www.fordwiki....ic_Mode��should get up to high 90deg or so.

also worth cleaning/swapping out t-map sensor.

could be air in the pump lower chamber, it has a one way valve at the bottom that fills up and keeps petrol in the chamber even if the tank is almost empty, if open air pumps through first...and takes ages. (only on low fuel though)
how old is the car you may have a test port on the rail.
 

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Big Megger
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588 Posts
could be air in the pump lower chamber, it has a one way valve at the bottom that fills up and keeps petrol in the chamber even if the tank is almost empty, if open air pumps through first...and takes ages. (only on low fuel though)
Is this repairable? Sounds exactly like the issue mine has, when cold with low fuel it will start then starve, second time it's hit and miss as to whether it will starve or not, and third time it's usually starting perfectly normally.
 

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Check thermostat in the mondeo the thermostat has an electric push rod in them that open the thermostat and that is controlled by the ECU now the plastic inside the thermostat gets hair line cracks in and the push rod opens and stays open so the car can never get to full temp so the ECU thinks the engine is cold so it throws more fuel in because of this it actually floods the engine making it hard to start on a warm start it also effects ideal speed as well because the ECU thinks its cold it also uses more fuel have a look on the on board MPG if it under 30 MPG you drive like a 17 year old or there is a fault my thermostat was £67 and it is made by gates,s not sure on spelling sorry
 

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Big Megger
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2,886 Posts
could be air in the pump lower chamber, it has a one way valve at the bottom that fills up and keeps petrol in the chamber even if the tank is almost empty, if open air pumps through first...and takes ages. (only on low fuel though)
Is this repairable? Sounds exactly like the issue mine has, when cold with low fuel it will start then starve, second time it's hit and miss as to whether it will starve or not, and third time it's usually starting perfectly normally.
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only way to tell is get a bucket and pipe on the test port and after its died after the fuel in the line has been used up reprime and plug in and listen/watch for air comming through.
or lift the pump out and see if it drains...it should not.
note though this can only happen if the tank is very very low on fuel. should be fine with half a tank. maby investigate purge valve instead.
 

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Big Megger
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588 Posts
I'm very tempted to just get a new fuel pump! Where is the purge valve on the 2.0 engine? Is there a way to test it or just clean it up and hope for the best?

Cheers.
 

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Big Megger
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2,886 Posts
follow breather pipe to engine it stops at the valve next to the coilpack, its like a solonoid valve it should click open shut when ignition is turned on, you need to test valve(9v battery should do) and check pipes. see if it starts when pipe is pulled maby.
there was a post not so long ago and valve was the problem.
 
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