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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 03-16-2002, 04:50 PM
razer70 razer70 is offline
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351 engine high oil pressure reading

Razer70....My 88 E-250 van 351 w ran fine bought mnth and half ago.Changed oil to synthetic 10-30,1000 miles later sudden ticking apparently from pass side valve cover or intake can't pinpoint exactly yet.When ticking started it idled erraticly.I drove home sat over night .When I started it it fires right up but my oil pressure reads almost pegged above normal or high pressure then slowly goes down to normal range when warm and stays there.While cold it idles fine when warm starts to idle erratic and the ticking is apparent.You can hear it pretty good.Not sure where to start.I think the synthetic oil was to thin for engine do you think it just could be oil pump not getting oil to that side?rocker arm or spring broken?Taking this thing apart ain't no easy task.Any guidance appreciated.razer...
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Old 03-17-2002, 10:47 AM
edenroadmaster edenroadmaster is offline
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351 engine high oil pressure reading

first,try switchng back to yer old type of oil and see if it goes away, then go from there
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Old 03-17-2002, 10:51 AM
edenroadmaster edenroadmaster is offline
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351 engine high oil pressure reading

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Old 03-18-2002, 04:58 AM
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cpnhgnjnky cpnhgnjnky is offline
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351 engine high oil pressure reading

Once you switch to synthetic oil it is HIGHLY RECOMMENDED that you DON'T switch back. Try a thicker oil. Also how many miles on it. Synthetic is smaller at a molecular level, so it can find all the little holes and bad spots the natural oil can't. One thing I have heard is these two tricks, never done either myself, but I have heard about 20 people mention it.
1. Try draining a quart of oil and replacing it with tranny fluid, this will help clean internally, since tranny fluid is like 70% detergeant.
2. Also I guess this CD2 is good at it also.

Try those to get all the galleys cleaned out to the top end. Lifters and such can start to knock easy when there is a lack of oil. Maybe the clean small synthetic broke up a clot and now its lodged in a galley way.
Don't know for sure, but thought I would give ya something to try. Just opinions, all except the changing back to reg. oil that is.

CJ

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Old 03-18-2002, 04:58 AM
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