I have a 2003 Carrera coupe with 27000miles. Every day first start up or warm start up (engine totally warm up turn off then start up around an hour), it will take around 10 sec to start up the engine. But when the engine start up it will just drive strong without problem and no engine light too. After the long crank to start up the engine then turn it off right the way, then it will start up in 3-4sec like normal.

I have changed new spark plugs, new coils, speed sensor, and air filter. But still no help.... So hope someone can help me here please.

Thanks

 

Did you check your battery? Or for engine codes? Crank sensor and fuel pressure!

 

Sounds like a fuel pressure problem. Put a gauge on your fuel rail pressure port(of have your technician do it) and see if fuel pressure bleeds down overnight. This could account for poor cold start.