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Open Roads Forum  >  Tech Issues

 > Fluctuating Oil Pressure

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BillyW

North ID

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Posted: 07/13/12 02:17pm Link  |  Print  |  Notify Moderator

'97 F150 with the 4.6L V8. It's not very noticeable except when towing. The gauge starts to bounce around and the oil light will momentarily come on. I was hoping it was the sending unit, but I guess not. Any thoughts?



'97 F150 4X4
'04 Pioneer 18T6



enblethen

Moses Lake, WA

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Posted: 07/13/12 02:29pm Link  |  Print  |  Notify Moderator

It is possible on some rigs that the check valve behind the oil filter is bypassing.
Have you changed your oil since problem has developed? They may have put the wrong filter in.


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BillyW

North ID

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Posted: 07/13/12 03:10pm Link  |  Print  |  Notify Moderator

The problem has been popping up for over a year. But was very inconsistent, until this week. I've had multiple oil changes since it started and did the last one myself, while changing the sending unit.

path1

Wa State (wet side)

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Posted: 07/13/12 03:24pm Link  |  Print  |  Notify Moderator

My best guess. Wiring, make sure it is good to include grounding. Does it act the same in cold weather? Since your oil changes, are you using same brand of oil filter? Just my opinion but some oil filters restrict oil flow during "high pressure" times like when towing or cold start ups. Try using a oil filter from your car dealer is see if any differance just one time.

(did a google search on "Fluctuating Oil Pressure" I was surprized to see what turn up, more than I thought.

* This post was edited 07/13/12 03:38pm by path1 *


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Posted: 07/13/12 03:33pm Link  |  Print  |  Notify Moderator

Check beneath the engine oil pan where you may find a wire harness running laterally across near a cross-member. Look at the convoluted black plastic wire harness sheathing to see if it has chafed through and into the wires.

skipnchar

Topeka or somewhere else

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Posted: 07/13/12 03:48pm Link  |  Print  |  Notify Moderator

Install an actual pressure gauge so you KNOW what is happening. Lights are truly idiot lights and tell you next to nothing.


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enblethen

Moses Lake, WA

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Posted: 07/13/12 05:11pm Link  |  Print  |  Notify Moderator

If the pressure is in fact, flucuating, it is not an electrical problem. Sounds like a filter or bypass valve problem.

BillyW

North ID

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Posted: 07/13/12 04:42pm Link  |  Print  |  Notify Moderator

I used a Motorcraft filter bought at Walmart. Yesterday specifically, while towing if I was on the gas the gauge danced around and would finally dip. That's when the light would come on. If I lifted off the gas pedal, the needle would go right back to where it belongs. After unhooking and driving around, no problem. I had the pressure tested, and it is definitely fluctuating.

Home Skillet

Pearland Texas

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Posted: 07/13/12 05:05pm Link  |  Print  |  Notify Moderator

On the right side of the engine compartment, behind the battery-look for chaffed wires on the A/C accumulator. Very common issue where the wire harness rubs through and shorts out.


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Home Skillet

Pearland Texas

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Posted: 07/13/12 05:32pm Link  |  Print  |  Notify Moderator

enblethen wrote:

If the pressure is in fact, flucuating, it is not an electrical problem. Sounds like a filter or bypass valve problem.


The oil pressure guage is basically a dummy light. Its either on or off.

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