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C20XE problem i need help


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I have problem when you start turning the car on idle needle starts to fly all ower the place and then car really hard turns on I changed starter and crankshaft sensor and it still does the same thing often car pull all electricity from battery...please help

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Water entry in electrical system, earth problem or short circuit?

Are you able to to plug in a diagnostic code reader to see whats going on?

Edited by IanMc
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John is right, on the other side some failures are not recognised because a bad temp. sensor gives the wrong signal and the ECU thinks the engine is warm... The throttle sensor gives a wrong signal and the ECU thinks you give full throtle... while you don't... 

So if the engines software gives no failures there can still be something wrong. 

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