Question about 1989 Ford Mustang

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1989 Ford Mustang GT Drop in Oil Pressure gage

My oil pressure gage keeps going high and low when changing gears. It will have no pressure what so ever especially after 3rd gear.

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  • antonm Jul 14, 2008

    Could it be it just needs a new oil pump and pan?

  • antonm Jul 14, 2008

    what's your thoughts on oil draining very slow to the bottom if the engines hot. barely any reading on the dipstick if the engine is hot. than once it cools down than i can get a regular reading on the dipstick.

  • antonm Jul 14, 2008

    thanks for the all the help. I'm probably going to replace the bottom end of the engine just so I don't keep worrying about stuff. I saw a master engine kit on Jegs from Eagle part#14003 so that will be most likely be the way I go unless I'm told otherwise. The engine runs hot so I'll be putting in a flexalite radiator #52185 too. I don't know much about engines so I'm just going off what people tell me. So I appreciate your advice. Thanks

  • antonm Jul 15, 2008

    I'll follow up some more at the email address you gave me. My mechanic pretty much said the same thing about not spending a ton of money yet. I look forward to your help. Thanks again.

    Anton M.


  • B-wizzy Oct 02, 2008

    i lost all oil pressure whike driving down the road and. seem to think it may be something to do with either main bearins or what ever propels the oil pump..what should i do??

  • Anonymous Mar 16, 2014

    low pressure port for 2006 mustang gt

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  • Master
  • 702 Answers

I hate be the bearer of bad news but it sounds like you bottom end bearings are getting worn out. You have excessive bearing clearances causing your drop in oil pressure.

Posted on Jul 13, 2008

  • 1 more comment 
  • Lee Quiroz
    Lee Quiroz Jul 14, 2008

    A new oil pump only pushes the oil around, the bottom end bearins is what actually gives you the pressure. For example, I build my engines with .002 clearance across the bottom and I can use a standard oil pump and have 75 psi cold and 60 psi hot. If the clearances get too great, this is what happens too much fluctation and low oil pressure.

  • Lee Quiroz
    Lee Quiroz Jul 14, 2008

    I say dump the oil completely out refill with a heavier oil like 20w50. Add a bottle of Lucas Oil Stabilizer to the oil and that will "band aid" the problem for a while. Lucas is an extremely good product and I use it in my racing engines all the time. This should work very well for you.

  • Lee Quiroz
    Lee Quiroz Jul 15, 2008

    I build these engines either in 331/347 stroker form or warmed over stock builds. Feel free to ask questions. I try to be as helpful as I can with fellow Blue Oval enthusiasts. Our email address is tiqautoperformance@live.com. I don't like the Eagle set up. I've seen to many of them break cranks. My 331 and my 347 both have SCAT cranks and rods in them. Don't spend a bunch of money yet until you get help with getting a game plan going. I'm willing to help if you'd like. Feel free to email me if you'd like. Let me know what kind of power you want to put out and I'll steer you in the right direction. I haven't had one of my engines come apart yet and I have a bunch out there.

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