hi guys i just did a timing belt water pump seals the whole nine yards on a honda accord and i just finished it off and started the car up after topping off the fluids and when i started it up it had a really high idle like 5000 rpm so i shut the engine off ASAP what went wrong. 4 cylinder 2.3 vtec 5 speed

 

Really HUGE vacuum leak: or maybe the throttle cable is hanging up holding the throttle open?

 

This is an old thread and a long shot that anyone will see this. I have the same exact problem with the same vehicle - 1999 Accord LX 2.3 a/t. I changed the timing belt, tensioners, water pump, and drive belts. When I start the car it immediately revs up over 4K. I have to shut it down right away. I bled the coolant and checked the vacuum lines. Did you ever solve the problem when you experienced it?