Oil Druck Press symptom, again, please read.

[rnln]

Recently, when the weather turn cold, I have a new druck press gauge problem. Hope someone can point me to the right direction. And please don't tell me it's my engine, or oil pump is gone, crossing my fingers.

1- at start up and complete stop (idle): if the RPM is 1k or above, the gauge works fine. But if RPM drop to below 1k, the needle pegs to the max (at 5) and stay there. If I touch the gas pedal, the needle come back down at normal position until the RPM drop to below 1k, then it peg again.

2- While driving, the needle works fine except when I shift. When I shift, I usually pause at neutral, which makes RPM drop close to 1k or so, the needle pegs to max and come back down when I hit the gas (RPM raise).

3- If I shift quick, which the RPM down't come down below 2k RPM, the needle sometimes doesn't peg to the max but it still bouces/dances in front of me before it come to the right position.

So the problem is related to the RPM, when it is drop low. The druck press sensor is new. It's only several months old. Before I replaced the sensor, the synptom was different. It either stayed at max top, or at the bottom. It was working perfect for several months.
I checked the wire the pass weekends and it looks ok. Does anyone have this problem?

[Rot 911]

I wonder if the internal wiring of the sensor is reversed? From your description this is what it sounds like.

[Hugh R]

When disconnected from the engine sensor, the needle pegs are you sure you don't have a loose wire?

[rnln]

Can you expand more detail. What do you mean by "reversed"?

Originally Posted by Kurt V

I wonder if the internal wiring of the sensor is reversed? From your description this is what it sounds like.

[rnln]

I am sure, because I tried to knock on it and twist it around, while the needle stay still at max top. When it happend, pulling the wire, then plauing it back, won't help. Only hitting the pedal, changing the RPM, will make the needle move.

Originally Posted by Hugh R

When disconnected from the engine sensor, the needle pegs are you sure you don't have a loose wire?

[Rot 911]

Originally Posted by rnln

Can you expand more detail. What do you mean by "reversed"?

The reason I suggest this is because it appears your gauge is working in reverse. Imagine the numbers on the gauge reversed with 0 at the top and 5 at the bottom. From your description, the gauge would them be read accurately.

Hmmm, maybe the wires on the gauge are reversed?

[rnln]

No, the gause has 5 on top and 0 at the bottom.

Oh, one more thing. Usually after warm up, the needle stay at 1 when idle. But now, it stays at 2.

[jh225]

Pressure sender has some crap stuck in it or the internal spring is played. Replace the sender and see what happens.

[rnln]

jh225,
are you serious? It's only couple months old. Well, I know I could have a defective one. Are you sure a defective/stuck sensor can be affected by different RPM?

[dshepp806]

WTF's driving the rpms up so high,..THAT'S the question..strange.......

...and sub'd.

Best,

Doyle

[dshepp806]

Originally Posted by rnln

Recently, when the weather turn cold, I have a new druck press gauge problem. Hope someone can point me to the right direction. And please don't tell me it's my engine, or oil pump is gone, crossing my fingers.

1- at start up and complete stop (idle): if the RPM is 1k or above, the gauge works fine. But if RPM drop to below 1k, the needle pegs to the max (at 5) and stay there. If I touch the gas pedal, the needle come back down at normal position until the RPM drop to below 1k, then it peg again.

2- While driving, the needle works fine except when I shift. When I shift, I usually pause at neutral, which makes RPM drop close to 1k or so, the needle pegs to max and come back down when I hit the gas (RPM raise).

3- If I shift quick, which the RPM down't come down below 2k RPM, the needle sometimes doesn't peg to the max but it still bouces/dances in front of me before it come to the right position.

So the problem is related to the RPM, when it is drop low. The druck press sensor is new. It's only several months old. Before I replaced the sensor, the synptom was different. It either stayed at max top, or at the bottom. It was working perfect for several months.
I checked the wire the pass weekends and it looks ok. Does anyone have this problem?

This "different" symptom you speak of,..are you now referring to pressure gauge? (not an RPM issue?) Otherwise. RPM stuff didn't happen before,...right?

Best,

Doyle

[sig_a]

This is a long shot, but it's simple and cheap.

Pull the plug from the oil pressure sender unit and clean both the post on the sender and the interior of the sleeve within the plug. In other words, thoroughly clean the contact points within the plug and on the sender.

You may want to clean these contacts with some fine grit emery cloth or something similar.

Pulling the plug from the sender should pin the needle at the top of the gauge range, so do this simple operation with the engine running. The sender is very sensitive to dirt or other contamination interfering with complete electrical contact which will result in erratic gauge behavior. Mine was bouncing around between 4 and 5 recently, and cleaning the contacts fixed it. Worth a try.

[rnln]

Doyle,
It is the Druck Press problem, but the activity related to the change in the RPM.

sig_a,
I will do that.
Thanks.

[jh225]

Originally Posted by rnln

jh225,
are you serious? It's only couple months old. Well, I know I could have a defective one. Are you sure a defective/stuck sensor can be affected by different RPM?

Am I serious? Absolutely. BUT, I am not sure if that is the problem.

I am having the same sort of problem since I changed the oil to BP. I don't know if some crud got lodged in the sender or if the spring inside the sender is played, but my Druck goes to 5+ after I get the RPM's up. Sometimes the needle comes back down, sometimes no.

I will be changing the sender out over the winter. It is much cheaper than a new gauge, no?

[rnln]

jh225,
umm.. sounds like y ours is opposite of mine. Can you post result?
Thanks JH

[tshih]

IIRC the pressure gauge pegs if one of the wire is grounded with engine off. If so then there is either bad ground or not a good ground. There was an article in Panorama by the late Jim Pasha about checking the health of the instrumentation cluster gauges in our cars with simple to do procedures like turning on the accessory position on the ignition and looking at the gauge read outs and what to expect .

Cleaning out the contacts and checking the wires sounds like a good start.