Ford Repair Questions? Ask a Mechanic for Answers ASAP
Helloyou've done a lot of the things I'd normally suggest however there's a couple to addI'd check that you're getting full power to the glow-plugs, they pull a lot of current so take care when checking but see if the relay is clicking when the ignition is turned on first and also check the fuse if this is OK check to see if the engine earth strap is also OK.You can test the glow-plugs with a multimeter by measuring the resistance across the plug ( between the power connection and the body) it should be around 4-8ohms if its tending to infinity / open circuit the plug is faulty or by using a clip on current clamp, either on the supply wire to glow plugs or onto engine earth, with glow plug light on you should see 15-20amps for each glow plug fitted, 4 cylinders would be approximately 60-80amps. If this is OK then check if the EGR valve is stuck open then this too can effect starting so try disconnecting it to see if this helps or changes anythingif it does then try removing the valve and cleaning it with brake cleaner as they do sludge up
Thanks il try that also forgot to mention when i opened bleed nipple on top of fuel filter after the problem started air escaped could any of this be related to air in fuel ?