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Holden Commodore: Difficulty starting

In the past couple of weeks my 2009 VE Commodore sedan has at times been hard to start. The starter motor turns over, but it takes several seconds for the motor to fire. Sometimes it 'times out' without starting and I then have to turn the start key again. It's fitted with factory dual-fuel, but it happens with the fuel switch turned to LPG or petrol, and can happen with the engine cold or hot. At the dealers suggestion, I left it with him for a couple of days and although it did happen to him a couple of times it was too intermittent for him to make any sense of it. Can you offer any suggestions as to its cause and what I can do about it? I presented the car to the dealer before the warranty expired, so would it be covered if the problem gets worse now that the warranty has run out?

It's not related to the fuel system as the Impco system starts on petrol every time, whether you've got the system switched to petrol or LPG. It's more likely to be an engine sensor, such as the crank angle sensor, which is playing up intermittently. Check the connections and the sensor itself. As for the warranty, you did the right thing in reporting while the warranty was in effect, so you could have a claim against Holden once the cause of the problem is  determined.

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