I am having a problem with my 2007 s2000 that hopefully you all can help me with!

At first, engine would run and drive fine, but would stumble when the clutch pedal was depressed. Basically the engine would lug from the pressure exerted on the crank by the clutch pressure. Then, the engine would not turn over easily - starter struggled to get the engine spinning. Bump-starting worked, but was extremely difficult. The engine felt like it had to break loose, and would rev fine but struggled to idle, especially when the clutch was disengaged. After a few miles, the engine died at idle, out of gear, clutch pedal not pressed (true neutral). Bump-started again, engine struggled to break loose again and ran a bit rough down low, but still revved out okay. Parked the car, killed the engine, changed the oil and charged the battery overnight (oil is settling in a clean pan and oil filter is draining to be cut open later). With fresh oil and a topped-off battery, the engine turned over and fired, but struggled to run at all, felt like it was over-loaded and struggling, and would not rev out properly (lugging/struggling did not change with RPM, but the roughness increased in magnitude). Dash cluster became a light show. Turned the engine off, let it settle for a bit, then tried again - same story, engine won't hold idle, struggles to keep itself turning, sounds like it's lugging at all RPMs, higher RPM makes shaking stronger but not faster. The check engine was not INITIALLY on, but it now is after the last attempt.

Does anyone have any suggestions on what is going on and/or how to fix this? It would be greatly appreciated!

 

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Does this mean your CEL is on? If so, what DTC is it throwing?

 

Starting Problems

 

You need to try turning the crankshaft by hand (with a ratchet and socket). If it is very difficult, you probably have internal mechanical problems. If it turns freely, check compresion.