water pumps don't normally give signs of failing. what happens is the bearings give out. you can take the belt off and spin the pulley, if you hear a grinding noise or it won't turn, you might have a bad pump.
A failing water will either 1) be noisey or 2) leak around the shaft or 3) Have some play present when the pully is pulled up and down by hand.( engine off)
A timing chain normally will last as long as the engine. Signs of a failing timing chain are chain noise and or engine that continues to jump time.
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There are several signs of a failing oil pump. A few signs are low oil pressure, increased temperature, and noise.
Inadequate fuel pressure. If that 2000 S10 Blazer has a 4.3 engine, it needs 61 to 66 psi (engine off with fuel pump running) to run properly.
The signs that i look for are: The engine uses oil - The oil pressure drops(worn bearings) - Fouled spark plugs - Oil in the air filter housing (caused by worn piston rings, called blow-by, a bad sign) - Moisture on the dipstick - Bad compression - A failed leak down Test - a plugged Catalytic Converter - Failing a "Smog" test
Signs of turbo going out are engine power is down or engine smokin oil leaking from turbo turbine shaft seal into combustion Chamber
Antifreeze, engine oil, and engine parts on the ground under the vehicle might be a clue.
Sometimes it will feel like hesitation, or set a check engine light and then after 50 miles or a few starts the check engine light will go out. Go have your fuel pressure tested. Have you changed out the fuel filter lately? It may be clogged too....and hope it is that, that is easy compared to replacing a fuel pump.
Antifreeze, engine oil and engine parts on the ground under the vehicle might be a clue.
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Engine light on