The knocking noise on a 2002 Isuzu Rodeo could be bad connecting rods. Listen to the knocking, if it get progressively worst at high speeds than the rods may be bad. To be sure check the oil pan for any shards of steel.
If it's knocking it's probably a rod going out - if it's ticking it could just be the valves - Rodeos are notorious for value noise...
If the noise is coming from where the water pump is, it is a good chance the it is actually the timing belt tensioner. These things are notorious for making awful noises when they are beginning to go out and will get worse and worse. The same engines are in an Isuzu Rodeo with the exact same problem.
bums
Check the serpentine belt. If it's loose it will make a terrible noise.
the water pump is driven by the timing belt so the pulley your talking about is not for the H20 pump but only for the fan
knocking noise
NO. A knocking noise in the engine is a problem in the engine.
I get knocking & ping noise coming from the fuel injectors
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
Im not sure, I have the same problem on my 96 rodeo 4 cyl 2.6L I did some research and I've found that it could by my flywheel i don't believe it was replaced when they changed my clutch but I cant say for sure I just bought it like that
When your engine has a knocking noise, it could mean that a rod has been thrown. It could also mean you are low on oil.
Usually a "knocking" or "ticking" noise when under acceleration means cheap fuel grade. Next time go for the gas with more octane such as supreme.