Maybe it has no compression--take compression test
Either your timing belt is stripped or broken. In order to have compression the camshaft and valves need to be in time with the crankshaft. If it has a distributor cap then remove it and have someone crank the engine. If the rotor does not turn then the timing belt is bad.
Many other options. No fuel pressure, broken timing belt, computer malfunction, no spark,
No compression on all cylinders, assuming pistons are moving and valves are intact - would imply bad valve timing, most likely timing chain... Several other issues can cause low compression in misc cylinders but no compression across the board without a catastrophic event such as major overheat or fuel washing cylinders, blown crank, etc - but "no compression" again, first check would be timing chain.
Broken timing belt, timing belt jumped teeth, crank key sheared off, vvt unit lost oil prime. That is the most likely scenarios if compression is equal or nonexistant across the cylinders. Dwayne
Possibly the crank sensor or the coil pack is dead. But with a dead crank sensor you also get no spark, no crank. No crank equals no fuel delivery.
IF your previous timing chain broke, you most likely got your "cam to crank" timing out of whack. If it didn't break and it wouldn't start before you changed it, your first basic steps would be to make sure your engine is getting fuel, spark, and air.
The problem will turn out to be either fuel delivery, ignition (spark) or compression. If all three exist in the proper amounts/timing... the engine HAS to run.
i would check cylinder compression, and definitely the timing. if you have good compression and timing is good, i have found that a bad or slipped timimgbelt or even, I've found the crank gear keyway bent or broken allowing the gear to move just enough to go out of timing. also check your distribitor cap and rotor. all of these things can cause your prob..
The most common would be engine cranks but does not start.
In order for an internal combustion engine to operate you must have four basic components. #1. SPARK. #2. FUEL. You have these two but need to check the other two. #3. TIMING(both valve timing and spark timing). If it has a distributor and you haven't messed with it then your spark timing is probably ok. Check timing belt. It could have broke or come off. #4. COMPRESSION. You will need a cylinder compression tester to ditermine if this is your problem. Have fun! Chris
"NO" compression - most likely timing belt / chain, assuming v6 2.7
The cost to replace a timing belt on a Chrysler Sebring can vary depending on the area you are in and if you do the job yourself or take it to a shop. You will have the cost of the belt and labor costs for the job if you take it to a shop.