Below are possible answers for the crossword clue Engine knock.
4 letter answer(s) to engine knock
PING
a river in western Thailand; a major tributary of the Chao Phraya
a sharp high-pitched resonant sound (as of a sonar echo or a bullet striking metal)
contact, usually in order to remind of something; "I'll ping my accountant--April 15 is nearing"
hit with a pinging noise; "The bugs pinged the lamp shade"
make a short high-pitched sound; "the bullet pinged when they struck the car"
send a message from one computer to another to check whether it is reachable and active; "ping your machine in the office"
sound like a car engine that is firing too early; "the car pinged when I put in low-octane gasoline"; "The car pinked when the ignition was too far retarded"
Other crossword clues with similar answers to 'Engine knock'