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Oil Pressure drop on open throttle?

Posted by kidmet, Sep 13, 2012

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  1. kidmet

    kidmet Supporting Member

    194
    17
    Joined Jul 23, 2012
    Aurora, Colorado
    Anyone know reasons that my pressure would drop when reving in the driveway? Same happens when driving and you press the gas. Don't want to damage the motor, so I haven't drive much at all. A couple houses maybe.
     

    817  1

    1998 Mitsubishi Eclipse Spyder GST
    awd · automatic · 2G DSM
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  2. 952g63t

    952g63t Proven Member

    401
    32
    Joined Mar 19, 2012
    Summit Point, West Virginia
    Probably should try and detail the problem more. Sounds like something is stuck inside one of the oil galleys. Check your oil pan.
     

    Street Build 4K  6

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  3. Clutch450

    Clutch450 Proven Member

    252
    1
    Joined Jan 15, 2009
    Lancaster, Pennsylvania
    Something is definitely going on. Your oil pressue is doing the opposite of what it should do when rpm's raise.
    What is your oil pressure like at idle?
     

    999  0

    1999 Mitsubishi Eclipse GSX
    11.244 @ 131.810 · 2G DSM
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  4. kidmet

    kidmet Supporting Member

    194
    17
    Joined Jul 23, 2012
    Aurora, Colorado
    Ordered a new oil filter housing as maybe the sending unit is bad? Can't hurt. Going to change the oil when that comes in and see where I'm at. Here's a video

    http://static.photobucket.com/playe...bucket.com/albums/v155/KidMet/VIDEO0053-1.mp4
     

    817  1

    1998 Mitsubishi Eclipse Spyder GST
    awd · automatic · 2G DSM
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  5. ramsack

    ramsack Proven Member

    3,286
    16
    Joined Dec 27, 2007
    West Lawn, Pennsylvania
    Just to be clear, oil pressure is RPM-dependent, not throttle-dependent.
     
  6. snowborder714

    snowborder714 Moderator

    16,138
    265
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
    What are you basing this drop on - stock gauge or aftermarket gauge/sensor?
     

    4K  0

    1995 Mitsubishi Eclipse GST
    12.529 @ 110.820 · 2G DSM
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  7. Colt4G63 also

    Colt4G63 also Proven Member

    3,392
    49
    Joined Jul 23, 2008
    Tonawanda, New York
    The oil pressure gauge never went above zero throughout the entire video, and the light comes on everytime it's off idle. I would say it's unlikely that both sending units are bad.

    Is there a dent in the bottom of your oil pan perhaps?
     

    Street Build 3K  0

    1990 Dodge Colt
    manual · 4G63t Swapped

    Street Build 2K  0

    1992 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  8. tds

    tds Probationary Member

    23
    0
    Joined Dec 10, 2011
    Oregon, Wisconsin
    I'd get a oil pressure tester (mechanical gauge) and see what the oil pressure readings are. A damaged or plugged up pickup may cause your issue.
     
  9. kidmet

    kidmet Supporting Member

    194
    17
    Joined Jul 23, 2012
    Aurora, Colorado
    Stock gauge... I'll look into a new oil pressure gauge. Also, where would I find and inspect the pickup? I'll have to look at the oil pan. My first reaction was yes, but now I can't remember.

    Yes, that's what I meant. sorry about that.
     

    817  1

    1998 Mitsubishi Eclipse Spyder GST
    awd · automatic · 2G DSM
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