After changing the timing belt on a 2.5L V6 SOHC engine (1997 Chrysler Sebring Convertible) the engine starts but immediately goes to a redline fast rpm. I don't know where the engine can get the air to run that fast. I have capped off all the vacuum lines including the power brake vacuum, the one hooked to the PCV valve and duct taped the EGR intake on the upper intake manifold (plenum). I capped the throttle body intake with a aerosol can cap and duct tape; thus no air can go thru the throttle or thru the air bypass passage. Upper and lower intake manifold gaskets have been replaced. The intake manifolds appear to be flat and should seal with new gaskets. The washers around the fuel injectors are in place. Do I have a magic engine that runs without air?
If I got the timing belt off 1 or 2 teeth, can air backflow thru the exhaust?
Can a valve be stuck open?
If I disconnect the MAP sensor and the temperature sensor for the intake manifold, the engine will not start. I would assume the computer won't open the fuel injectors without these sensors.
I changed sparkplugs, wires, distributor cap and rotor at the same time. I screwed up and cross plugged 2 wires. The car actually ran with the crossed up spark plug wires and would go highway speed but was weak on power and the check engine light would flash on and off. At idle I could hear a sound that seemed as if gas was ignited in the exhaust system. The sound was more off a swoosh than a bang. The high rpm idle problem started after I corrected the cross spark plug wire problem.
Any ideas?