Dward34

Hey there, driving a 2013 5.0L STX4x4 with 106xxx miles. I’ve had my OPSU replaced 3 times. Every time after about 6-8 months my oil pressure gauge on my dash drops to zero and jumps back and forth from normal to zero. I know it’s a dummy switch and drops to zero at a certain point. This only happens when idling in drive and when in reverse. It doesn’t happen in neutral or park. Also, there is absolutely no rough idle, engine noise, or spuddering when this happens. I’ve noticed it acts up usually when the outside temp is about 75 degrees and above. I just bought a new switch and plug for the truck and am attempting it tomorrow myself rather than taking it to a mechanic (I’ll keep you updated). Has anyone had any success fixing this problem? It’s not entirely too expensive to fix, but I’m worried of an underlying issue, and don’t want my truck blowing up one day. Let me know if you have any ideas or opinions, I’ve about had it.

Thanks

I’ve uploaded a video of the problem. At least tried.

FerdinandF150

I was diagnosing an oil leak and as part of my inspection checked out the sending unit. I noticed folks would remove the alternator to get to it, but with the right tools it is visable and likely removable from the underside.

While there you could do a pressure test just to have the info. I know the sending unit can be faulty though.

RLXXI

Sounds to me like your using inferior aftermarket sending units. Get one from Ford or if you are actually using a Ford sending unit, you can always T into it and use an aftermarket mechanical gauge that'll give you actual oil pressure readings.

Dward34

I’m not sure what parts the mechanics were using, but yeah, this one is a Ford switch. So here’s hoping. I just couldn’t see it being 3 faulty sensing units in a row, but I guess there’s always that chance. Appreciate it.

Dward34

I’ve had a couple pressure tests done to make sure there were no leaks. I was told everything checked out, and no leaks. And yeah, they might have been faulty. I just didn’t think it was faulty all 3 times, but I’m not sure what parts they were using or their durability.

maco

I agree 3 faulty units ???? might want to double check connector & the wire ....
just guessing wouldn't hurt to @ least clean it ???

gDMJoe

Engine?

HINT/TIP: Put your -complete- vehicle information (year, model, cab, trim, engine, wheelbase, _x4 drive, mileage, modifications, etc., etc.) in your signature -OR- provide it in your posting(s).
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Dward34

5.0L STX4x4 SuperCab 6.6ft bed

Dward34

All done replacing the switch and the plug today. Took about an hour, 15 of which was spent looking for the switch after I dropped it while attempting to thread it back in. Pretty simple and didn’t need to remove the alternator.

Everything is fine right now, guess I’ll check back in in 6 months to give an update.

Pro tip: Do this whole the engine is completely cold. Burnt the **** out of my hands.

fudge0514

You have a 4x4 and you were able to do it without removing the alternator? Nice job.

I hope you cleaned out the connector real good and used a Motorcraft OPS.