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mk5 cranking but not starting ?

the goat
the goat
in Ford Fiesta Club

Featured Replies

hi folks, we have a Mk 5 sometimes it cranks but doesn't start, wait a few mins and it starts other times it starts no problem

changed the coil pack, still the same, I can hear the petrol pump running before I try to start it

is there a relay that feeds the coil pack ? (thinking could be fauty relay ?)

anything else  I should look at ?

  • Quote


    hi m8, could try obd, see any faults, so many sensors these days, guess you tried plugs and air filters, maf sensors may need a clean,but only use proper maf cleaner if you do, good luck

  • Quote
    • Author

    no faults showed on OBD test, Got a DS150e tester and software so bit more than basic tests

    it can give Live Data but not sure what Live test I should do when car is running

    as its an inttermittant faut its a pain to find, but If it was a sensor fault it would have a log record

     

  • Quote
    • Author

    could it be the crankshaft sensor ?  its an intermittant fault, no fault codes 

    anything to check to see if crankshaft sensor

  • Quote
    On 4/20/2025 at 8:42 AM, the goat said:

    anything to check to see if crankshaft sensor

    A live data feed of its output. 

  • Quote
    • Like 1
    On 4/19/2025 at 7:26 AM, the goat said:

    hi folks, we have a Mk 5 sometimes it cranks but doesn't start, wait a few mins and it starts other times it starts no problem

    changed the coil pack, still the same, I can hear the petrol pump running before I try to start it

    is there a relay that feeds the coil pack ? (thinking could be fauty relay ?)

    anything else  I should look at ?

    Mine does this sometime and I find it's immobiliser switch off lock open then starts I've also known throttle bodies be bit tempramental

  • Quote

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

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      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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