high oil pressure
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Joined: Feb 2008
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high oil pressure
I just bought a 1988 F250 w/ 460 ci engine. My oil pressure gauge goes past high when its started and stays there. I changed oil/filter and put in a new thermostat (unrelated issue). Any ideas?
Elder User
Joined: Jul 2007
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From: Agawam,MA
I'd start with the sending unit... I've had that happen before, although not on this make/model.
Disconnect the lead. If it stays at "no pressure", that rules out a short in the wire and check out the unit next. Not sure what these cost, though. But if the actual oil pressure was really that high, there would be other symptoms
Disconnect the lead. If it stays at "no pressure", that rules out a short in the wire and check out the unit next. Not sure what these cost, though. But if the actual oil pressure was really that high, there would be other symptoms
Last edited by gray91; Feb 6, 2008 at 07:58 AM.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
The gauge is just an idiot light. If you have at least 7 PSI, it swings to about halfway up the gauge. No pressure and it will obviously read in the red. Any other readings are the result of electrical or sender issues.
Senior User
Joined: Jan 2008
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From: pg b.c
if your relief valve was stuck resulting in high pressure, you most likely woud have blown off the filter, so it likely is the gauge
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Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
blown off the filter? I don't see how...
The only way to have a legit high reading is if the valve in the oil pump is messed up. Put a real gauge on there and if you still have a high reading than the oil pump needs to be replaced.
The only way to have a legit high reading is if the valve in the oil pump is messed up. Put a real gauge on there and if you still have a high reading than the oil pump needs to be replaced.
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Senior User
Joined: Jan 2008
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From: pg b.c
Originally Posted by MustangGT221
blown off the filter? I don't see how...
The only way to have a legit high reading is if the valve in the oil pump is messed up. Put a real gauge on there and if you still have a high reading than the oil pump needs to be replaced.
The only way to have a legit high reading is if the valve in the oil pump is messed up. Put a real gauge on there and if you still have a high reading than the oil pump needs to be replaced.
Posting Guru
Joined: Mar 2007
Posts: 1,757
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From: Florida
The high reading could also be a bad ground...the sending unti is groudned to the block by itself.....could try pulling it out cleaning the threads up real good and puttin her back in there...might solve.....you would be better off with a mechanical though anyways.....then you always know.
JR
JR
Fleet Owner
Joined: Jan 2008
Posts: 26,898
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From: southern md
my 88 f150 had a ranger sending unit on it from the factory-space limitations I guess went to a mechanical and original-just re piped the connection-and hooked it all up with the correct sending unit-was like $4 in part for the piping -not including the mechanical oil gauge-you think ford could have spent an extra $4 to get the right gauge on there???