Question about Kia Rio

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Kai Rio built sept 07.Suspect fuel pump fault.Car randomly cut out when driving & won't immediately restart,leave a few hrs & restarts & drives ok again. Any engine fault codes for fuel on this car?

Engine cranks over ok. No blow fuses. Have replaced fuel pump relay but made no difference. I am trying to determine if it is the fuel pump or some other engine sensor that is causing the problem. I can not understand why the car restart after it has sat for several hrs. Temperature related?

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Generally this kind of problem is caused by a faulty electronic component getting heat soaked. Best bet is to run your diagnostics while the car is still warm and won't start. If you wait for it to cool down (when it starts), the problem will not present itself. If it's not trying to start at all, it's usually the ignition module. If it runs rough, it's usually one of the coils.

Posted on Jan 03, 2017

  • Steven Pond
    Steven Pond Jan 03, 2017

    I will have carry a spare spark plug and if it does it again remove a lead and check that there is spark happening.

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It cuts out while driving I have pump the gas to try stopping from cutting out and if it dose cut out it doesn't always start the first time. We have put a new pump in and checked all the hoses.


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Pumping the accelerator pedal is unlikely to make any difference to an electronic fuel injection system in the way it used to do in the carburettor days.

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