Mk7 2.4 wont start when warm

[Martyd67]

Hi all new to this site and need help
I have a 2010 2.4 rwd it starts every morning when cold tick over is bit erratic till it warms up when warm if I turn it of it fails to re start it tries for a second then cuts out once cooled down it will start again .
I've had 4 new injectors new high presure pump new prv, pump control valve,presure sensor ,starter motor and crank sensor it has no codes can any one help please

[knobby1]

When all these parts were replaced....were the learns done..??

Lord Knobrot

[Martyd67]

As far as I know was done by a local garage

[knobby1]

As far as I know was done by a local garage

So you don't know for sure..? If the learns haven't been completed successfully, it will never run as it should.

Lord Knobrot

[Martyd67]

Ok thanks I will ask today

[Martyd67]

I have emailed the garage to check if this has been done as you say ..can I add this morning it struggled to start from cold but with the smallest amount of easy start it fired every time

[Martyd67]

Also just noticed that the glass on the filter head is half full off air it this normal

[Martyd67]

Garage did do the lerns when fitting parts

[knobby1]

Also just noticed that the glass on the filter head is half full off air it this normal

Check for a good seal on the fuel filter, is it a genuine Ford filter..?? Also check for cracked filter head assembly, reasonably common, it allows the air into the system and the fuel then drains back to the tank making starting difficult.

Lord Knobrot

[Martyd67]

Thanks I'll check those tomorrow

[Martyd67]

New filter housing and filter fitted today started no problem from cold but still wont start when warm without the dreaded easy start

[Airthies]

It sounds like it just needed a new SCV and PRV then learns done.
But you need to find out where the valves and pressure sensor came from and if they are genuine denso items.
The pressure sensor should not need changed as they're very rare to fail, I've only heard of issues with sensors that folk have changed as they bought a cheep kit from eBay or motor factors and with a good one from Ford or the likes of PFJones then it all starts to work properly.

The values need to be checked when it's hot, fuel pressure fuel demand, cam and crank sync. Etc to give a better idea of what's going on.

Easy start WILL destroy your engine. As it gives a far higher crack and burns hotter when it combusts than diesel, it may not be noticed immediately but it will do a little bit more damage every time.

Time to find a mechanic that understands these better than your current place by the sounds of it, as it sounds like there just throwing parts at it?

Sent from my anu5 using crapatalk

[Martyd67]

Update
New presure sensor scv and prv fitted today once again all denso parts all lerns done van still wont start when warm and getting really hard starting cold now but unplug the high presure sensor and van will fire up and run in limpo but wont tick over any ideas guys

[Airthies]

What codes are you getting?

What you using for reading codes?

Have you done an injector leak off test?

If so how did you do the test?

What is the actual fuel rail pressure?
And what is the demanded fuel rail pressure?

Has the resistance of the wires from the rail pressure sensor to PCM been checked to see if there is a residual resistance due to corrosion or fatigue that is causing the PCM to read an incorrect value?


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[Jim Archer]

Also check the crank sender readings, and crank/cam sync when it won't fire.

Jim