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Q:is the knock sensor easy to replace?
A:It honestly depends on your vehicle. For help with your project, I recommend getting a repair manual specifically for your vehicle. It should be able to help you with detailed instructions on how to do many things.
A:on a Mustang V-8 You had beter know how to handle tools and have a repair manual on hand as the knock sensors (2) are under the intake assembly.
Q:what does the knock sensor do?m
A:It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.