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  #1  
Old 11-27-2013, 10:57 AM
gnarshosapian gnarshosapian is offline
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Default Oil Pressure Diagnosis

2001 Ranger 3.0L, 5 speed, 123xxx miles
Recently I have experienced the following after driving for more than an hour. When I stop the truck and let the revs drop to idle speed (~900 rpm) the oil pressure gauge flicks back and forth between middle pressure and low pressure. As soon as the revs are brought back up this stops.
When this happened initially I checked the oil right away but It was exactly where it had been when I had checked it the previous week. I noticed no change in the power, nor any suspicious noises, smells nor visible smoke. I also checked the coolant for signs on oil but saw none.

I have heard of problems with the oil pressure sensor in high mileage rangers. Does this resemble that problem or something else? Help me diagnose this please! Thanks
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  #2  
Old 11-27-2013, 11:29 AM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Oil Pressure Diagnosis

Those Ranger gauges don't reflect actual oil pressure at all, they are idiot gauges, they are designed to read mid scale when there is like 5-7 psi. Ford did this because too many people were coming in for warranty service claiming that their vehicle had low oil pressure when the engine was warm. Duh, it will go down when warm as opposed to cold, but it cost Ford money explaining the obvious to people. So they cured it.

Hook up a real, mechanical pressure gauge and take a reading if you want to verify system integrity. Odds are, if your oil level is correct your sender is crapping out.

*Dont' use Fram/Pennzoil oil fiters either, they are overly restrictive.
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Old 11-27-2013, 12:07 PM
ranger024x4 ranger024x4 is offline
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Default Re: Oil Pressure Diagnosis

Quote:
Originally Posted by cowboybilly9mile View Post
Those Ranger gauges don't reflect actual oil pressure at all, they are idiot gauges, they are designed to read mid scale when there is like 5-7 psi. Ford did this because too many people were coming in for warranty service claiming that their vehicle had low oil pressure when the engine was warm. Duh, it will go down when warm as opposed to cold, but it cost Ford money explaining the obvious to people. So they cured it.

Hook up a real, mechanical pressure gauge and take a reading if you want to verify system integrity. Odds are, if your oil level is correct your sender is crapping out.

*Dont' use Fram/Pennzoil oil fiters either, they are overly restrictive.
x2 to everything.

my mustang does the exact same thing. just alot sooner. (20 min in to a trip). Im hooking a mechanical gauge upto it this weekend to see what it truly is.
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