Oil pressure drops to zero at idle

20

Asked by Jun 09, 2015 at 02:04 PM about the 2001 Dodge Ram 1500 4 Dr SLT 4WD Quad Cab LB

Question type: Maintenance & Repair

When the truck is idling it Has no oil
pressure and the check gauge light
comes on but when I raise the rpms
it goes back to 40 I rebuilt the engine
650 miles ago and it has a new oil
pump could it just be the oil pressure
sensor?

8 Answers

25

could be your oil pressure sensor, the oil pressure gauge or simply the oil pump bad. I would start with the simplest first. Test the pressure sensor and pressure gauge. Also when you rebuilt the engine, did you clean out all sludge and change the oil pump?

1 of 1 people found this helpful.
20

Yes I did clean out the sludge and the oil pump is new how do I test the sensor and gauge?

2 of 2 people found this helpful.
29,075

first take off the sender...start/idle for 2 seconds .did /does a stream of oil shoot out//if so first replace the sender.

2 of 2 people found this helpful.
25

Depends on the car. But usually people first check continuity on the harness first, then check resistance on the pressure sensor and then resistance on the gauge. My 1988 4runner was doing the same, once engine warmed up, the pressure would read 0. In my case the pressure switch is cheap so i did trial and error. Just replaced it. Didnt work, i checked the harness and it had corrosion on the ends. Cleaned them out, got little better. At the end it was the gauge on the instrument cluster. Needed a better clean ground.

1 of 1 people found this helpful.
80

Just FYI...I am having the exact same issue with my 2002 Dodge Ram 1500 (91,000 miles). I have replaced the oil sending unit (and had a bad solenoid replaced on the transmission). Thought it was fixed, but began happening again. (mine will also begin to heat up when this is happening) Talked to a trusted mechanic in town, and he informed me of another customer having the SAME problem with his Dodge pick up. He recommended I call the Dodge house. They said theyre unaware of this being a standard issue, and it will cost me $200 just to diagnose the problem. I suggest looking at some of the other message boards as well...and if anyone figures out what the deal is, Id LOVE to hear it!

2 of 2 people found this helpful.
10

I got a 1985 dodge ram charger with a built 318, cam, intake, heads, carb, crank, pistions the whole 9 yards and I was driving it to school and it was pretty early in the morning and the oil pressure is at 40 when its idling and when I get into it its usally between 80, and 60 it jumps all over well it was back firing through the carb I think it was running to lean maybe because it was a cold start I have no Idea, but now the oil pressure jumps all over

1 of 1 people found this helpful.
30

I’ve got a 2005 Dodge Ram 1500 5.7L. The oil pressure gauge started doing the same thing to me this morning. It reads normal when I start it up, but then drops to zero after a min. I’ll reply if I find out what it is.

3 of 3 people found this helpful.

GuruZ4PDH any word on what that was?

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