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Warm start issue

Discussion in 'Leon Mk1 (2000-2006)' started by Cuppyjoe, Feb 7, 2020.

  1. Cuppyjoe

    Cuppyjoe Active Member

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    As above, when the engine is warm it's a bit lumpy initially. It's like the engine is over fuelling coz it doesn't know that it's hot.

    Annoyingly, I recently changed the engine temperature sensor because I had an EML on and my cheap Amazon code scanner told me that there was a P1296 code. Code scanner then cleared the code and seemed a bit better.

    Now my EML is back on the code reader won't connect to my ECU so I can't see if it is the same issue.

    Any ideas?

    I'd be surprised if it was MAF because it's fine on cold start and any other occasion. Could be a dodgy coolant temperature sensor?
     
  2. Alexis27

    Alexis27 Active Member

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    What brand was the new coolant sensor?
     
  3. Chaki

    Chaki Active Member

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    Check fuel pressure regulator, i had the same problem on volvo t5 model 850.
    When cold it starts perfect but after some driving it cranks a lot then starts and i could smell raw fuel...
     
    Cuppyjoe likes this.
  4. Cuppyjoe

    Cuppyjoe Active Member

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    Delphi. I've asked the seller to send me another which they are doing for free.
     
  5. Cuppyjoe

    Cuppyjoe Active Member

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    Thanks. How do I check if it's the fpr?
     
  6. mty12345

    mty12345 Active Member

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    I agree that the coolant temp sensor is the most likely cause, not sure there is anyway of checking the FPR other than plumbing in a pressure gauge and measuring the fuel pressure.
     
    Cuppyjoe likes this.
  7. Cuppyjoe

    Cuppyjoe Active Member

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    Got a new one on it's way, hopefully will cure it!
     

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