I was driving and the water pressure gage dropped to zero and could no longer accelerate. The engine lost all power. The engine now turn on but it knocks, and someone told me that it might be the internal water pump. I replaced all coils and spark plugs and still have the same situation. Do I repair or buy a new engine?
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Re: buy new engine or repair?
If all you need is the water pump then this is not a major repair.
if you ran hot and cooked engine and it is knocking you are sometimes better getting a reman vs rebuild as you get a good warranty. jasper engines has a 3yr 75k mile warranty
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If you know for a fact the sending unit is working and you do have 35psi when the engine is hot, it could be the gauge on the dash. You may need to install an external gauge, manual or electric. Or replace the cluster.
Have the oil pressure checked with a special test tool, you may have a defective oil pressure sending unit. If the pressure is low then you have other more serious problems and the truck should not be driven until the oil pressure issue is resolved, low pressure will destroy the engine if left unrepaired.
You need to verify that you actually have oil pressure before continuing to drive. It may only be the sender or the gauge, but you need to verify oil pressure. The sender is on the right side of the engine block, remove that,pull your coil wire so the engine won't start, and crank it over. If you have oil pressure, oil will squirt out of hole.
Check the fuel regulator at the end of the fuel rail. If if is not functioning properly it can cause the the problem that you are describing. Unfortunately other than doing an R&R with a known good regulator I do not know of a fool-proof test for this component.
You may have a bad oil pressure sending unit. The kit they are talking about, I believe is a rebuild kit, not the entire pump. Usally the kit consists of a couple rotors and seals. You would take the old parts out the oil pump housing, and install the new ones. But you want to make sure that all the clearances are within specs. I'd try the sending unit first.
Typical Chrysler issue....I am going to assume you may have the 4.7L motor...2 possible issues: HEAVY oil sludge in engine (death to engine pretty much) and/or your oil pump needs replacing. Lastly, just throwing this one out there as it happened to me..oil sending unit gone bad.