Oil Pressure
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New User
Joined: Apr 2004
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Oil Pressure
I've got a question. My 94 F150 has a 302 approx 239,000 miles on it. It start having a little lower than normal oiil pressure on the gauge. After it warms up the gauge goes to pegged out on low. Could this be the oil pump? I know the oil gets thinner when at temp. Or am I way off.
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
Does the motor knock or make any other noise? The gauge in the dash is nothing more than a "smart" idiot light. It has a switch where the old sending unit used to be, and there is a resistor on the gauge. It's really only going to read two things, nothing or mid range. The mid range will fluctuate some with voltage.
Post Fiend
Joined: May 2004
Posts: 11,289
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From: Lakewood, Ohio
gauge moves if oil pressure drops below 7 psi.
i am with stealthwyvern, i bet it is the oil pickup.
check pressure with mechanical gauge.
i am with stealthwyvern, i bet it is the oil pickup.
check pressure with mechanical gauge.
Last edited by quicklook2; May 13, 2007 at 11:09 AM.
Senior User
Joined: Jun 2003
Posts: 238
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From: Virginia
Straight 30 weight oil gets thinner as it heats up. But, 10W30 or 10W40 get thicker as they heat up. The numbers are the oil viscosity when cold and then when hot. It's some crazy effect of polymer chains shrinking in legnth when they get hot.
I have this same problem. I have also heard to change the oil pickup and perhaps the pump. But, I have also ehard that it's not a very fun job to get at the stuff. You have to jack the engine up a few inches to get the oil pan out. I haven't done that yet, but there are lots of posts on that.
I have this same problem. I have also heard to change the oil pickup and perhaps the pump. But, I have also ehard that it's not a very fun job to get at the stuff. You have to jack the engine up a few inches to get the oil pan out. I haven't done that yet, but there are lots of posts on that.
Freshman User
Joined: Feb 2007
Posts: 32
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From: Topeka, KS / Okmulgee, OK
Check the oil pickup tube. If it is clogged a new oil pump would be a wise investment as it has probably been starved for oil and is now cavitated. also lose the idiot light. a guage that you can accually read is worth its weight in gold.
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Post Fiend
Joined: May 2004
Posts: 11,289
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From: Lakewood, Ohio
Originally Posted by ricky-barnec
I've got a 95 and every 10,000 mi I replace the oil sending unit,which only cost 10 bucks, my oil pressure gauge reads 25 psi , after replacing the unit its back to normal ,why i dont know, but it eases my mined,
is yours after market?
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New User
Joined: Apr 2007
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no its not, but I'm thinking about changing all my gauges over to after market ,oil ,volts,etc... even a rpm as well.the after market stuff isnt bad looking to,I well fill alot better knowing that what I'm looking at is real [ what do you think ]
New User
Joined: Apr 2007
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Originally Posted by stevenb
Thanks for the info. Is a chemical flush the best way to clean the pickup and the screens?