Knock when starting '99 4.6

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Knock when starting '99 4.6

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Ford >> Ford Cars >> Ford Crown Victoria >> Knock when starting '99 4.6

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Knock when starting '99 4.6 - 8/6/2006 8:50:51 PM

Beaux Duke

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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?

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RE: Knock when starting '99 4.6 - 8/6/2006 8:59:08 PM

94 4x4 ranger

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I would use a regular oil filter. it does sound like it starves for oil

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94 4x4 ranger

(in reply to Beaux Duke)

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RE: Knock when starting '99 4.6 - 8/6/2006 9:04:18 PM

Beaux Duke

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A "regular oil filter"?

Do you mean a filter without the anti drain back valve or a Ford/Motorcraft filter?

I've been using the same model Purolator filter for about 40K miles with no problems.

(in reply to 94 4x4 ranger)

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RE: Knock when starting '99 4.6 - 8/6/2006 9:10:12 PM

94 4x4 ranger

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Yes one with out a drain back valve.

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94 4x4 ranger

(in reply to Beaux Duke)

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