The valves are really noisy and oil volume is not low. Does not need changing. I have heard it before when I first crank it up then it smooths off but now it keeps on clicking and won't stop. What do I need to do next? It is 3.0 V6 1998 grand caravan.
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Re: valves clicking with no lack of oil
The noise you are hearing is the ( hydraulic lash adjusters). They are located under the rocker arm assembly. To get to the assembly you will have to remove the rocker arm covers and remove the complete rocker assembly and springs. you will need to remove complete assembly from engine and put on a clean table to remove worn out hydrolic lash adjusters. If you attempt to do this yourself, remove the negative battery cable from battery before you start. If you have no experience on working on engines then take it to a mechanic to do the work. hope this will help you.
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The engine is designed to cut out after a few seconds without oil pressure.
So you need to establish if it's a faulty signal, or really is low oil pressure.. Low oil pressure could be down to catastrophically low oil level - top it up to the upper mark IN STAGES, 1/2Litre at a time. Choked oil filter, jammed bypass valve, blocked strainer, can also all cause the problem - lack of maintenance? Have you recently used a flushing oil in an old engine?
Also using very thin oils e.g. 0W30, in a very worn engine, will not allow the pressure to build up.
Try an oil change with the manufacturer recommended oil. Make sure it is the correct weight, type and grade. I never recommend synthetic for older cars with high miles. You can also buy oil additives at the parts store designed to increase oil pressure and quiet noisy lifters/valves. Oil light means low oil pressure, usually due to broken down old oil, dirty oil filter, or incorrect oil weight used.
Rick you don't say what vehicle it is. I don't believe mixing oils will affect tappet noise unless one of the two oils was way too thin a grade.
If all else is OK, rattly tappets aren't generally a big worry unless you also get hard starting, which indicates the valve timing is way off. I've had vehicles in which valve noise was factory standard LOL.
You could try an oil change with one grade heavier.
The rattle might also indicate that the upper cylinder head is being starved of oil, either due to low pressure, or sludging. You could get oil pressure measured to eliminate that possibility.
After all else if you want to go further you could get the valve lash adjusted, but in some motors it is a helluva job, and in a van, it is more difficult.
The oil light is triggered by only one thing - the oil pressure in the engine is too low. Without oil the metal parts of the engine rub themselves directly, causing the sound you heard. Running the engine without oil is a sure way to completely destroy it extremely quickly - under no circumstance you should run the engine in this condition.
Only one thing can cause the lack of oil pressure: a failed oil pump. The fix is simple: you drop the oil pan and you replace the oil pump. If a mechanic can't diagnose that then either is an idiot or is trying to scam you. Take your car to a real mechanic's shop and have it fixed. And from now on stay away from these dishonest shops which almost surely have milked you of your money long enough: fuel pump replaced 7 times?? the gauges??? fuel tank???? Really??!??
First check the oil level and condition. Have your trucks oil pressure actually checked with a gage. It should be at least 42p.s.i. to 55p.s.i. The knocking noise is probably related to low oil pressure. Depending on the type of knock it could be crank shaft bearings, piston wrist pins, rod bearings, cam bearings or noisy lifters. All a result from low oil or pressure. 3 possible causes, are low oil level and pressure, lack of oil changes and viscosity of oil breaks down to where it can't lubricate or dissipate heat and coolant getting into oil, reduces pressure and prematurely wears down bearings. Have it properly diagnosed before you seize your engine solid.
Sounds more likely to be a timing rattle rather then all the lifters at once making noise, if your EGR valve is bad this will happen and if the timing is off it will also do this, I can't buy the theory all 16 hydraulic lifters are noisey unless you over reved it something fierce, or ran it out of oil, or had someone loosen all the rockers.
If the oil pressure is correct and it is all of the valves and not just one or two which need adjustment then it sounds like the engine has a lot of oil deposits built up in it which is blocking the oil from reaching the top of the valve rods. I have seen many engines in the past gummed up like that after using Quaker State for a long time. You might try using engine oil flush to see if it breaks the deposits loose.
there are several things that can lead to this. first check oil is there any water/antifreeze or white foam in it? if yes engine needs to be rebuilt/replaced. 2 check anti freeze/coolant is there any oil in it? is oil level really low or really black and thick? can be a head gasket has blown or lack of oil or oil change and wrist pins or bearings are ruined from lack of maintenance. best bet is to take to several garages and have them diagnose problems. get 3-4 opinions and go from there. was engine used to race and with manual transmission it could have been over revved and blew bearings.