I have a problem with the oil pressure goes down when im at lights and sometimes while im driving. i know its not the guage because if i let it sit down for a minute the engine starts knocking. doesn anyone know what this could be. also there are no leaks in the block . its a 98 dakota with only 104 thousand miles. any info would be appreciated. thanks
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Possible fuel delivery problem. Check fuel pressure for correct PSI. Check fuel filter for restriction. Check engine light on? If so, scan for trouble codes that may indicate sensor issues that can also cause this type of problem
When an engine gets hot, you must shut it off before it gets so hot that it begins to lose power. Sometimes this simply can't be done safely. Once the engine gets so hot that it shuts down, permanent damage may have be done. Bearing can gall, piston rings can break, piston crowns melt, but usually the oil breaks down and the main damage is to bearings and perhaps the crankshaft. Diagnostics would include changing the oil, attaching a good mechanical oil pressure gauge then spin the engine with the spark plugs removed to see how bad the damage is. If oil pressure is adequate, run a compression test. This should give you enough information to decide if the engine can be saved without a major overhaul. Low compression can mean blown head gaskets, warpped heads, broken piston rings, warpped valves, etc.
Sounds like the engine is toast. The warning light means the oil pressure has dropped below 10psi which can mean the engine is low on oil, or that something has happened to the oil pump or other components. The crank bearings may be seized from lack of oil. See if you can turn the crank by turning the alternator pulley.
there are pressure sensors inside your transmission which tell it when to shift and whether to shift up or down. i would bet it is has something to do with those. if you take it to a shop, its probably 150-200 to fix, but better than having to rebuild the transmission, which could be around 800. the shop can plug a reader in and drive it around the block and tell you if the sensors are out.
Firstly, check your engine oil level. If the level is low, the rocker arms in the cylinder heads can tap tap tap... This may be why you're getting an engine light. Check the oil pressure gauge for a reading. If the oil pressure and level is ok, you can run an oil cleaning agent thru your motor with the oil and then do an oil change. Sometimes you can quiet a noisy motor that way. You could also use a high-mile oil in the motor and see how that works. You can also add an oil additive to help quiet older motors.. hope this helps you. K