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Poor starting

Vinny Gould
Vinny Gould
in Ford Focus Club

Featured Replies

Hi all 

my 09 Ford Focus 1.8TDCi has a problem starting I have  changed glow plugs and battery, but when I open the bonnet it starts first time it doesn’t happen all the just every now and then. Any ideas what this could be.

  • Quote


    1 hour ago, Vinny Gould said:

    Hi all 

    my 09 Ford Focus 1.8TDCi has a problem starting I have  changed glow plugs and battery, but when I open the bonnet it starts first time it doesn’t happen all the just every now and then. Any ideas what this could be.

    poor battery cold whether voltage drop - diesels need good battery to crank due to higher compression in cylinders. 

  • Quote
    • Author

    Hi had brand new battery and glow plugs, but it’s when I open the bonnet it will start first time could this be the bonnet switch 

  • Quote
    On 12/14/2020 at 9:16 PM, Vinny Gould said:

    my 09 Ford Focus 1.8TDCi has a problem starting I have  changed glow plugs and battery, but when I open the bonnet it starts first time it doesn’t happen all the just every now and then.

    If it is cranking over at normal speed, then air ingress into the fuel line from tank via filter to the pump is a good suspect. Even a little air seeping in here will make for extended cranking on starts, or no start at all. These pipes are almost always under suction, so you are not likely to see fuel leakage, and even a tiny crack, or damaged gasket in the filter, can allow air in.

    At temperatures above about 15C, glowplugs make little difference in this engine. Slow cranking can give poor starting, especially if engine compression is a little low due to wear. Wires (Battery & Earth), solenoid, starter motor, can all cause slow cranking, as well as the battery.

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