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this is a common sign of a bad oil pressure sender, but could also be caused by low oil pressure, a sender is cheap,but it"s always smart to do a pressure test first with a mechanical gauge,you can obtain a mechanical gauge from most automotive parts stores. then you"ll have to locate and remove the oil pressure sender and install the gauge you bought. make your test at warm idle you should have at least 25 psi below that you may very possible have worn engine bearings making it impossible for the engine to have any better oil pressure at idle. if you have 25 or greater psi of pressure at idle replace your oil sender and you"ll be back on the road
Well i hope its not the oil pump because the oil pump works with the speed of the engine when it turns and as you know when the engine turns fast the oil pump turns fast too and the more you accelerate the faster the oil pump turns, that means there is more pressure of the oil to go up top the engine and when the engine idles, The pump turns slowly, and doesnt pump enough oil up top the engine and the oil pressure switch dosent detect any oil passing by then it send a message that the pressure is low. So check your oil pressure during idle. Good luck Bro
with the cap off when you start the car does the water shoot out? if so the head gasket is blown and when the cap is tight the water is pressurized by the leaking head gasket and will cause to overheat from pressure blowing all the water out of the overflow. or the head gasket leak is boiling the water in the head and causing the water to overheat. this is my guess or you have a coolant leak somewhere over the exhaust and it isnt making it to the ground from evaporation. check for swollen hoses. if you have swollen hoses ill bet they are covered in oil this will break down the rubber and weaken the hoses keep all oil leaks from getting on your hoses at all times as this will destroy them.if you need to replace the cap then the pressure release in the cap is worn out or stuck and the pressure isn't reaching the over flow. replace cap and see if problem is resolved.overheating isn't usually caused by a cap. but cars differ in design and the thermostat may need the pressure to release properly. if that doesnt work try replacing the thermostat it is responsible for releasing hot water from the engine to the radiator to be cooled by the fan then close off so the water can cool in the radiator. if this cycle doesnt work properly then the thremostat is usually the culprit. replace as nessesary. good luck
On the 325 series I have worked on (your year, make, model), I have found that idling issues like you describe are the result of a defective oxygen sensor. Replace the oxygen sensor with a Bosch unit. That should take care of your issue.
Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.
On most newer cars there is a fast idle motor controlled by the computer that will hold the fast idle till the engine reaches a preset temp in the computer then the engine should drop down to the set idle according to specs for that car. If the oil pressure continues to stay low after the idle goes down you may need to replace the oil pressure sending unit or if worse case the oil pump.