Odd oil pressure fluctuation??
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Elder User
Joined: Feb 2004
Posts: 851
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From: Longvalley, SD
Odd oil pressure fluctuation??
I have had my 86 f-350 with a 6.9 NA for only about 3 months. When I bought it it never had alot of oil pressure on the stock gauge. The needle ranges from 1/2 way or at about the R in normal at idle. But when I get going down the road it will drop to just to the left of the N in normal on the guage. It will also fluctuate with no rpm change while cruising down the road. The engine runs fine and does not smoke. Does anyone have any idea what would be causing the fluctuation? Should I be worried?
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
The stock dash guage is not very good.
What it says just means you have oil pressure, no indication of how much you have.
Manual guages are the best option if you want to know how much oil pressure you really have.
What it says just means you have oil pressure, no indication of how much you have.
Manual guages are the best option if you want to know how much oil pressure you really have.
Posting Guru
Joined: Mar 2005
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From: KY
Originally Posted by sledguy24
hah ur kidding so its eithor YAY or NAY as far as amount of oil pressure.. so i have a 92 diesel 7.3l is that the same way?
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Originally Posted by catfish101
The dash gauge can act the sameway in that truck too. Part of the problem is the voltage regulators in the dashes will go out and will let the gauges fluctuate.
Junior User
Joined: Jan 2006
Posts: 77
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From: York, PA
yep the gages are more like glorified dummy lights, they dont read liniarly. they just show good once you are above 7-12 psi or something like that. there is a write up somewhere where you can swap the sending unit out and remove or add a resistor to get some liniarity out of them.
in other words get a mechanical gage
in other words get a mechanical gage
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Originally Posted by j-redsjeep
yep the gages are more like glorified dummy lights, they dont read liniarly. they just show good once you are above 7-12 psi or something like that. there is a write up somewhere where you can swap the sending unit out and remove or add a resistor to get some liniarity out of them.
in other words get a mechanical gage
in other words get a mechanical gage
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Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
In my 86 the amp guage has never moved from day one.
Temp guage never really moved much either.
Oil pressure always showed almost pegged on the high end even after 300,000 miles.
Suddenly one day after installing a reman engine, the faster the engine was running, the lower the oil pressure guage read.
I freaked and installed a manual guage.
It was really funny to watch both guages, they went opposite directions as the RPM increased or decreased.
Now a mechanical oil pressure and water temp plus a volt meter reside in a pod on top of the dash.
I will say that my fuel guage has always been rather accurate, still is today.
Temp guage never really moved much either.
Oil pressure always showed almost pegged on the high end even after 300,000 miles.
Suddenly one day after installing a reman engine, the faster the engine was running, the lower the oil pressure guage read.
I freaked and installed a manual guage.
It was really funny to watch both guages, they went opposite directions as the RPM increased or decreased.
Now a mechanical oil pressure and water temp plus a volt meter reside in a pod on top of the dash.
I will say that my fuel guage has always been rather accurate, still is today.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
It seems to me like we would be hard pressed to find two 80-86 trucks that read the same.
My amp guage will respond to glow plug cycling, headlights, and will nearly pegg if the batteries are low after startup, then slowly come back down.
Temp reads at least 1/2 when warmed up, and never goes past 3/4, temp reading rarely reflects operating conditions.
Oil reads about half when cold, and can fall t 1/3 when idling after a hard days work. It does seem to read higher with rpms.
Fuel gauge?? hehe, well, both will try to show empty at about half a tank, but for some reason, the front tank will start to come back up to 1/4 and stay there for a while.
My amp guage will respond to glow plug cycling, headlights, and will nearly pegg if the batteries are low after startup, then slowly come back down.
Temp reads at least 1/2 when warmed up, and never goes past 3/4, temp reading rarely reflects operating conditions.
Oil reads about half when cold, and can fall t 1/3 when idling after a hard days work. It does seem to read higher with rpms.
Fuel gauge?? hehe, well, both will try to show empty at about half a tank, but for some reason, the front tank will start to come back up to 1/4 and stay there for a while.
Posting Guru
Joined: Mar 2005
Posts: 1,701
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From: KY
Knock on wood but my dash in my older truck that I have had for years has always been pretty good. I have replaced the regulator twice over the years but It was obvious that it was bad. I forget where I bought them now. It wasn't hard to find but I can't remember for sure though.
