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Humming or hunting?

Pedro

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I recently changed the HPFP on the 200 GT & noticed there appears to be a Humming sound (up & down tempo) from the engine? I always wait for the oil pressure to build up before I set off but it has never made this noise before I swapped the pump & Its got no faults thrown up & runs fine but it has me thinking the engine could be hunting for a timing parameter which is very odd as the tensioner was changed & chain does cry in very cold weather but why its suddenly begun to hum a tune is very strange unless there could be a lazy coil pack/packs on the horizon but at 43.549 mls I could be wrong as according to some expert websites? the coil packs should last the life of the car! 👀😐
 

DKZ5745

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I had a coil pack go just before Christmas. I had all 4 replaced along with all 4 plugs. Mine had done @ 47k
 
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