I have a 2005 Honda Civic i would rev it a lot and now the car is jumpy even on the stop lights what's wrong?
I have a 2005 Honda Civic i would rev it a lot and now the car is jumpy even on the stop lights what's wrong?
Revving the engine while it's unloaded (like if you're revving the hell out of it while in neutral at a stop) is extremely hard on it. Doing it repeatedly can damage a number of things depending on the engine's design. If you made a habit of revving the engine in neutral, you're probably now experiencing the after effects of that habit in the form of damage and the resulting run problems they've caused. The only way to determine what exactly is damaged is for someone to inspect the engine in person.
It's worse to rev an engine completely unloaded than while under load is because of how quickly the unloaded engine gains RPM. Even in 1st gear, it takes at least ~2 seconds to go from idle to redline RPM at full throttle in most cars. Put your right foot to the floor in neutral however, and the engine hits redline RPM in half that amount of time (or less) assuming there's not some kind of electronic limiter preventing it (many newer cars DO have an electronic RPM limiter that limits RPM to ~4000 or less while the transmission is in 'neutral' in part for that very reason). Most engines aren't designed to go from idle to redline RPM in less than a second because, while in gear and loaded, the engine NEVER gains RPM that rapidly from idle to redline. When "throttle blipping" between manual shifts, for example, the engine isn't going from 750rpm to 6000+ rpm - it's only blipping unloaded over a range of maybe 2000 rpm.
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