Yaris Cold start problem

[vinny121]

I changed the plugs on other cars. I'll check the air filter first. The Yaris manual says the plugs should last 100K miles but it is possible that they need to be changed. It could be the coils also. I'll remove the plastic cover on the engine soon and check out the condition of the coils and plugs. FWIW, the same starting problems occurred intermittently this winter. Maybe it is time to take apart the ignition system.

BTW, at what mileage did you have the cracked coil? Wouldn't an ignition problem cause the ECU to show the 'check engine' light?

Do you think that a fuel injector cleaning done by a repair shop help me with the throttle body? Or maybe should I use one of those commercial cleaners myself (from a bottle)?

Thanks!