Check oil pressure gague came on and pressure dropped to zero.
This occured at idle. Whe I resumed driving, the pressure went back to 20lbs. The manual said 17 to 20 is normal in city driving and as low as 13 is acceptable in some situations. I took it home and parked it. The oil level is fine. It is a 2001 JGC with the V8. It has about 80,000 miles.
Re: Check oil pressure gague came on and pressure dropped...
Thanks for the input. but did anybody think about the oil pressure relief valve in the pump,right now the engine is running fine and the oil pressure is at normal,i never changed anything, I,m assuming it,s time for a internal cleaning, how about an engine fush and new 5w30 oil every other month. do you think that will help.
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if the guage is unreliable and its the only one that is, may switch to an aftermarket separate oil pressure guage that mounts elsewhere and be done with the situation entirely..these run around 25 bucks and its time to install and it wont fail like electronic ones do...
Locate the oil pressure sending unit and get a pressure test for yourself. If it is okay, replace oil pressure sending unit. If the pressure is 0. Replace the oil pump. Probably not 0 because engine would seize.
Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.
If your oil pressure is dropping to zero at an idle, then I would quit driving the vehicle. It is very possible that the engine is low on oil. Or that the oil pump is going bad. If you continue to drive the vehicle, you could ruin the engine. There is a oil pressure sending unit that could be bad. But if the oil pressure goes up when it is above an idle, then the sending unit is probably ok.
This has an electric pressure gauge with a sending unit. Try this: When at idle, SLOWLY increase the engine speed. If the needle on the pressure gauge all of a sudden leaps to a pressure (like 'real quick') and acts normally with even faster engine speeds, the sending unit is bad. (It is just not reading the lower pressures.) Zero engine pressure will manifest itself in a bunch of knocky sounds and lifters that aren't pumping up and therefore "ticking" loudly. You probably don't have that since you didn't mention these problems.
Replace the sending unit after the above test and you should be fine.
The low number bothers me...some people will tell you that 10lbs is fine, however this engine generally runs at least 30 at idle hot, sometimes a bit lower but not much.Pressure drop hot is because the oil flows easier when warm, and internal clearances change as well. First, I would have the pressure verified by using a mechanical gauge (yours is electric) If actual pressure is the same as your readings, I'd change the oil and add marvel oil to remove any deposits which may be on the pump pickup screen. Check oil you drained for fuel smell to make sure it's not contaminated. If pressure does not improve, or drops further, you are going to have to drop the pan and check for bearing wear.(pumps generally don't go bad...wear at the bearings allows pressure to escape) If you find any bearings out of tolerance, change them and the pump as it may have some internal scoring from debris.
2004 Jeep Wrangler Problem solved (low oil pressure at idle)
These are the steps to identifying the oil pressure issue
1. Check the oil pressure guage - this is an easy test to preform by grounding out the single wire from the oil pressure sensor and confirming the gague adjust appropriatley. (With the wire grounded out it should show no oil pressure.) Take the wire off ground should show normal pressure. 2. Change the oil pressure sending usint (15.00$) from the dealer. (cheap way to eliminate a possible sensor issue). 3. Manually hook up an oil pressure gague and check the oil pressure. Make sure the engine is at operating temperature when checking as it can have a significant impact on the reading. (I bought a oil pressure guage for 19.00$ online that works perfect. Comes with everything you need to check the OIL pressure at a resonable price.)
Operating pressure should be from 15psi to 60psi. During idle at normal temperature Oil Presure should not be below 15psi.
MY problem: (Oil pressure gugage was droping/ fluctuating at idle) was determined that the oil pump was bad after following the steps above (My readings where 3psi at idle at running temperature. I replaced the oil pump. (only use a Melling Oil pump do not use any other brand I am not a sales person for Melling but is prefered by me and many others that I have spoke with as a soild reliable inexpensive solution 40$-50$). After I changed the oil pump It was determined that Chrysler has installed an alluminium oil pump which had significant wear at only 98,000 miles that had caused it's poor performance. I am not a fan of allumnium oil pumps. How ever it supplied just enough pressure to keep the lifters from clapping so I got luckly and was able to catch the issue before the pump failed leading to bigger problems. After the oil pump was replaced my Oil Pressure is 18psi at idle.
If you have to go this far internaly go ahead and spend the extra time to check the Main bearrings for any potential wear issues that could also cause low oil pressure. If you don't want to check all of them at least make sure you check the thrust bearing for any wear as this is a crucial area. All of this can be done by droping the oil pan. (You have to drop the skid plate, exhaust and starter.) It took me and a friend about 5 hours to do everything in the drive way.
This all based off my experience and I am no way an expert. How ever I do not take into consideration lack of maintenace and sludge build up from not properly changing the oil every 3000 to 4000 miles. If you have a sludge issues you should maybe sell or get rid of the vehicle as there could be all sorts of issues from the cam bearing to main bearings to a restricted pick up tube.