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6

It sounds like a valve adjustment is required There are many items that can make a 'ticking' noise that is tied to the RPM of the vehicle. Having the sound match RPM's certainly gives a clue that it is associated with the operation of the engine. Many times a valve adjustment is required. This is a component of a regular maintenance schedule for almost ...


2

It's really hard to hear the noise in the video. The observation that it changes with fan speed is a strong indication that it has something to do with the blower fan. It is not uncommon for broken fan blades to cause rotary imbalance, resulting in the fan sounding very noisy when in operation. Note that this explanation would not explain any noises you ...


2

You should check belt tension and visually inspect the pulleys for rubber deposits. You can check pulleys by applying a load to the pulley and spinning it. You probably need to include which transfer case you have on the vehicle by looking at the stamped plate. How much vacuum is "little vacuum"? If you have a NVG231 there should be engine vacuum (roughly ...



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