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Thread: Discovery 4 SDV6 hard starting

  1. 13th August 2022, 06:42 AM #1
    transtar
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    Discovery 4 SDV6 hard starting

    Engine turns over ok but does not fire. After waiting some 2-3 mins with ignition on starts ok. Is this sign of fuel tank pump on way out?
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  2. 13th August 2022, 07:27 AM #2
    Graeme
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    Have the crankshaft position sensor checked by graphing the RPM using a diagnostic tool during start-up.
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  3. 13th August 2022, 09:49 AM #3
    DiscoJeffster
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    Having had this exact issue, I concur with Graeme. A new Crankshaft Position Sensor sorted it. It’ll do this weird no start for some time and then it’ll fail on you whilst driving. It’s about then you’ll finally get a code that says what it is. As Graeme said, get a code reading tool capable of showing RPM and watch to see if the RPM signal stays solid. RPM comes from the CPS.
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  4. 13th August 2022, 11:55 AM #4
    transtar
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    Thanks Graeme and Disco Jeffster
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  5. 18th August 2022, 08:29 PM #5
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    350RRC
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    Quote Originally Posted by DiscoJeffster View Post
    Having had this exact issue, I concur with Graeme. A new Crankshaft Position Sensor sorted it. It’ll do this weird no start for some time and then it’ll fail on you whilst driving. It’s about then you’ll finally get a code that says what it is. As Graeme said, get a code reading tool capable of showing RPM and watch to see if the RPM signal stays solid. RPM comes from the CPS.
    If they had a CPS at each end of the crank they could throw a specific fault code for 'that' really serious issue.

    DL
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