Knock when starting '99 4.6
#1
Knock when starting '99 4.6
My Crown Vic has developed a knock when starting. It happens cold or hot but most often when cold. It'll do it when hot but only if it's been shut down for a while.
It sounds to me like oil starvation of the lifters. I'm using Castrol 5W-30 with a Purolator filter that has the anti-drain back valve.
It just turned 75k and the knock started about 5K ago. The knocking stops after about 3 - 5 seconds. Seems to be just a little behind the oil pressure gage, in other words the gage shows full pressure then a second or two later the knocking stops.
Any suggestions?
It sounds to me like oil starvation of the lifters. I'm using Castrol 5W-30 with a Purolator filter that has the anti-drain back valve.
It just turned 75k and the knock started about 5K ago. The knocking stops after about 3 - 5 seconds. Seems to be just a little behind the oil pressure gage, in other words the gage shows full pressure then a second or two later the knocking stops.
Any suggestions?
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