Originally Posted by kscoyote
hmmm. Could be a vacuum leak.
Exhaust leaks don't usually hiss . ..
You might just run it to a dealership . . . get your oil changed & let 'em find out what's going on . .
if it is a vacuum leak,would that make the ticking noise loud?it doesnt tick when its cold.only when it heats up.then sometimes when it does tick,its not as loud as other times.the noise almost sounds like the ticking that fuel injectors make only louder.plus the check engine light is on.other than that everything is great except i have a warped brake rotor.this is the first mustang i have owned so having problems doesnt impress me,but no car is perfect.....