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It sounds like the oil sending unit is bad. the safest way to check it is to pull out the sending unit and install an oil pressure gage directly to the motor start it up, bring the RPMs up and see what the oil pressure is. Ideally you want at least 15 psi at an idle and prefereably anything above 25 psi at crusing RPM.
Hi Mike, if your oil pressure gauge is acting eratic or your oil pressure light stays on you could have a faulty sending unit, gauge or air in the system or a restricted oil filter, start by checking oil level in tank and make sure it is between the add and full mark. With engine at normal operating temperature 180-230 degrees and the use of a 10 micron synthetic media oil filter, oil pressure will be 30-38 psi at 2,000 RPM and 3-5 psi. at idle. The oil pressure light is designed to come on at 2 psi. or less. To accurately test oil pressure remove oil pressure sending unit and install known good oil pressure gauge that reads 0-50, there might possibly be some plumbing required for hard to access points. If you are out in the middle of nowhere and there is no cell phone service and your oil pressure gauge isn't working and your oil pressure light is burned out, despair not, you still have one last line of defense left HYDRAULIC LIFTERS, as long as those tireless workers are quiet, you have oil pressure, maybe not much, but enough to get you down the road at a slow to moderate speed using the least amount of RPMS as necessary. Good luck and have nice day.
hello there I looks like your oxygen sensor,Try to disconnect and then see what the car does?Let me know.You may need to adjust the fuel mixure,seem it is running a little rich that is why the car in idle goes up and down. email@example.com
Maintenance activities should be done at so many hrs of run time. Your manual should list recommended service hrs. Telling you to change oil or filters every 3 months may be wrong. It all depends on how many hrs it has run. Maintenance items include air filters,belts,oil in both engine and compressor, fuel filter and battery if equiped on the engine.
Do you believe oil gage? Oil psi sensor can go bad. If PSI correct then is PCV valve clear? I'm more inclined to think you have some kind of electrical problem, false gauge, ignition quits or fuel delivery problem. Extreme high oil PSI would blow out your engine seals, leaking oil everywhere. When you get high oil psi, does removing oil cap make it drop? Do you have good clean oil and filter?
When it quits do you have spark, fuel to delivery system? (throttle body or fuel inj) High oil psi shouldn't make truck hard to start. Baffling.
CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred. · Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.
If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance
at what? depending on engine temp and rpm, normal oil psi should read 30-40 psi at idle and at cruising speed of 1500 to 2000 rpm should read 60-70 psi. most bonnevilles from 1992 to the last year run of 2005 have the 3.8 liter V6 which was updated over the years.
At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end? If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)