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  #1  
Old 07-10-2010, 01:58 AM
jeff pearson jeff pearson is offline
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Default Oil pressure drops to zero

Whats up with this? After warming up to operating temperature, my oil pressure gauge drops to zero when I come to a stop or idle. As soon as I start moving it's right back up to straight up position. I replaced the sensor, still does it, changed the oil, still does it. The engine doesn't heat up or start ticking or anything even if I let it sit and idle for 30 minutes.

There's more, but I would like to hear what you think about this situation before I give you, "The rest of the story!"

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Old 07-10-2010, 02:40 AM
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Without knowing the rest of the story, and me being no mechanic, I had a similar problem with my Jeep (I reference that vehicle a lot because while it ran better than my old truck, the last couple years it decided to plague me with some interesting problems, lol), but what was recommended to me, in order of cheapest to most expensive, was to replace sending unit, then oil pump and finally the gauge. I was not low on oil and had no engine noise other than the tap from a bad lifter. I got lucky and the sending unit was the problem. Are you getting any codes, MIL lights on the dash?

- Cajun
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Old 07-10-2010, 02:46 AM
jeff pearson jeff pearson is offline
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Default Replaced OEM oil sensor with mechanical pressure sensor and gauge

O.K. Got fed up with the dropping to zero crap. So I replaced the oem sensor with a oil sensor and gauge that I mounted under dash.
NEVER did the oil pressure go to zero, till I shut it off. It did drop when idling but no less than 20psig. So why does the oem sensor drop to zero?

I am going to hook up oem sensor to brass fitting and pressurize it to see the electrical response to varying pressures.

I will keep you posted.
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Old 07-10-2010, 02:53 AM
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I see you're really struggling trying to chase this down and I do know how aggravating that can be, hence my post in your original thread, but now you're just trying to figure out if the OEM sensor was bad? Are you getting good results from the sensor/gauge you installed? That one seems to be giving the right readings if it doesn't fall below 20 psi.

- Cajun
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Old 07-10-2010, 03:55 AM
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From what I can tell, the oem sensor does not give a proportional response to a varying oil pressure input. It is more like an "On/Off" device, what it seems to do is monitor the oil pressure and if it drops below a certain value, it clicks open and the oil pressure dash meter drops to zero. Once the actual oil pressure rises above that set value, it clicks closed and the pressure dash meter needle goes back to reading straight up. I've never seen it indicate half pressure or anywhere between straight up and zero.
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Old 07-10-2010, 04:02 AM
jeff pearson jeff pearson is offline
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Default

And I don't think the oem sensor is defective, it's just alot cheaper than a proportional output type. A couple bucks times a million vehicles is alot of incentive to go with the on/off kind. Next time they should make it an option. Good oil sensor or crap one? $5.00 extra!
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Old 07-10-2010, 04:05 AM
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I know when the sending unit went out on my Jeep, I was still registering values (from the gauge) between 0 and 20 psi, but usually, it was reading 0-10, and rarely higher than 10 psi, but, like you, not low on oil, no engine noise with the exception of a bad lifter and gauge went to 0 at stops/long idles. Randy (Remerson228) is our resident tech on here and I'm sure when he gets on in the morning, he'll be able to give you his thoughts/recommendations on this and what to do, so hang in there, and good luck!

- Cajun
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Old 07-10-2010, 04:59 AM
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Default

I can't say for sure on the Dodge, but have run into this before on other vehicles and was shocked to discover that the sensor was, as you suggested, a pressure 'switch'. I have noticed that the oil pressure gauge on my truck does NOT move with RPM....which I would expect if it was variable output from the sensor. It's either at 'Zero'....or straight up, so I suspect it, like the others I've dealt with, is just a switch.
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Old 07-10-2010, 06:51 AM
jeff pearson jeff pearson is offline
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Default Oil pressure related problems

I think we nailed it on the head. It's just a switch. They could have saved some money and just put in a light that goes on and off instead the needle gauge deal.

But even though its just a switch it probably trying to tell us something.

Whats involved in putting in a new oil pump? If it does the same thing after I put in a new pump, I'll jumper the wires to the battery or something to have it come on with the ignition just to stop the "Ding" and
the "Check Gauges" at every stoplight.

Are you a big "Wheat Kings" fan?

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Old 07-10-2010, 07:39 AM
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If you want to replace the pump, you need to drop the oil pan, remove all the accessory drive system, the timing chain cover, and 3 timing chains.
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