I use to have this problem, Most of the time the noise that make it sound like a whistle or Turbo noise. Its the seals are leaking its ether header or Manafold. Get a new gasket for ether of those. Use a Brake Spray to test it out!
It depends on what is making the noise.
It retards / slows the engine timing up when it detects an engine knock / pining noise like bad fuel are valve noise.
Engine running hotter then 220 degrees can cause valvetrain noise. Bad fuel can also cause valve noise / PINGING sound. Ignition timing to high / Advanced to far, can also cause engine noise.
it will be your valve lifters common problem for the Mazda 626 engine when they start to get up in the milage
Your toilet may be making noise due to a faulty fill valve or a loose flush valve. To fix it, you can try adjusting the water level in the tank, tightening any loose parts, or replacing the fill valve if necessary.
Yes, the purge valve clicks.
A clicking noise in the engine of a 91 Ranger could indicate a problem with the valves. A valve lifter in the engine may be worn or stuck.
you have a stuck valve
Bearing noise is usually deeper and comes from farther down in the engine. Lifter noise is more of a ticking and is up in the engine heads.
An engine "knock" will become more pronounced when engine is labored (climbing a hill) Valve noise will remain the same under stress
An "engine knock" will be more noticable when engine is labored (climbing a hill etc.) Valve noise will remain constant
Your toilet may be making noise every few minutes due to a faulty flapper valve, a leak in the fill valve, or a problem with the water level in the tank. These issues can cause the toilet to constantly refill and make noise. It is recommended to check and repair these parts to stop the noise.