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accuratemech

07-28-2019 02:41 PM

99 F150 4.2l excessive vacuum

99 F150 4.2l excessive vacuum - engine has 206K miles and has enough vacuum at the oil fill tube to collapse a plastic oil container in seconds. Don't know how there is that much vacuum there. Also at idle and normal temperature the oil pressure goes to zero, OK until it reaches operating temp. Vacuum hose routing seems to be OK. Anyone seen this problem. I have two 1999 4.2Ls and a 2003 4.2l to compare with, this one stumps me.

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