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I have a 1990 f350 w/ a 460. It runs great with 105000. It has oil pressure issues at idle and start. I have a manual gauge on it now. It has good pressure in operation. What could be the problem? I put thinner oil in it also, no change. It don't want to ruin the motor.

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  • Cars & Trucks Master
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Probable worn hydraulic cam followers/lifters . They have a specific leak down time and if badly worn then the pump may not keep up the pressure at idle. Alsao there may be a problem with the pressure relief valve in the oil pump system

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

  • 13 Answers

SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

GARYca
  • 672 Answers

SOURCE: I have a 1990 camry. Starts good, idles OK, can

check your IAC valve, it may be sticking/stuck. hopefully this helps

Posted on Aug 12, 2009

  • 12104 Answers

SOURCE: oil light on no pressure gauge sounds like now

ur diesel engine is ur rockers and push rods /valves and lifters metal on metal no oil lubing parts--real bad --sounds like an oil pump problem if level is good-- would require to have scanned for trouble code it would narrow down trouble but driving will most likely cause more engine damage need to have mech or dealer inspect and scan problem and its advised to have it towed where ever u pick

Posted on Oct 14, 2009

  • 114 Answers

SOURCE: I have recently purchased a 1997 Toyota

Unless you are in a cold part of the country, I'd suggest 10W40 or even 20W50 and see if the oil pressure improves. Mobil 1 will often yield lower oil pressure in higher mileage engines when hot. It's really not worth the money unless you live in near arctic conditions.

Posted on Dec 20, 2009

  • 274 Answers

SOURCE: Low oil pressure at idle, up tp 20psi under

You could have a blocked or broken oil pickup inside the sump or a broken spring in relief valve Think relief valve is on pump on those but not sure I'd be looking hard at pickup in sump

Posted on Jan 27, 2010

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1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
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