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Old 12-13-2012, 08:43 AM   #1
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oil pressure gauge

Hey guys my oil pressure gauge reads normal when i first start it and while I'm cruising down the highway. When I'm in fifth and slow down to 45 which is just under 1500 rpm it says I have little to no pressure but once I go above 1500 I have pressure again. Also if i let off the throttle when that happens I all of a sudden have pressure once more. What do yall think is going on?
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Old 12-13-2012, 09:37 AM   #2
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Same exact thing going on with my 87 GT 5.0.
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Old 12-13-2012, 09:49 AM   #3
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Oh mine is a 89 5.0

---------- Post added at 10:49 AM ---------- Previous post was at 10:49 AM ----------

Gt
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Old 12-13-2012, 09:55 AM   #4
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It is normal for the gauge to read higher (around center of gauge) on first start up when the car is cold. When it warms up, it should go to around 3/8 up on the gauge.
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Old 12-13-2012, 12:39 PM   #5
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That's not what I'm worried about I'm wondering why it says there is no pressure like I first described
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Old 12-13-2012, 01:36 PM   #6
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Quote:
Originally Posted by jacob.a.gasparp
That's not what I'm worried about I'm wondering why it says there is no pressure like I first described
Oil pump might be failing with NO pressure. Any nocking or heavy tapping? Take your pan off and clean the oil pump screen if you have time and lack of funds. Worth a shot! Sorry I misread your post man.
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Old 12-13-2012, 05:58 PM   #7
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That's fine and no knocking or nothing like that
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Old 12-13-2012, 06:12 PM   #8
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This was happening to me when I had a blown head gasket.
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Old 12-13-2012, 10:22 PM   #9
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Well now either my vacuum hose to the brake booster came undone or the brake booster went out Oiy
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