Mitsubishi Verada Engine Problems
Is temperature the reason my Mitsubishi won't start?
The cold cranking power required to start an engine first thing in the morning when it’s cold is much higher than when it is a little warmer, as it is later in the day. Make sure your battery has sufficient cold cranking power to do the job. If the battery is too small, even if it’s new, it might not have the power needed to crank a V6. If it does have sufficient power then look to the starter. If the starter is not throwing in it could be worn.
Mitsubishi Verada TCL warning light
There would seem to be no option other than to replace the faulty solenoid as the dealer suggests. Not replacing it isn't an option, as the traction control will not be working when the light is glowing.
A ROTTEN-EGG smell is usually caused by a malfunctioning catalytic converter. Your dealer should be able to detect this when he checks the emission system. I don't believe shopping around for petrol will overcome the problem. I would take the car back to your dealer and have the engine and emission systems checked for faults.
I'M AFRAID there is no special tool that will do the job. You need to take off the top half of the inlet manifold to get at the rear plugs, but leave the throttle body hanging on the hoses so you don't have to bleed the system when you put it back together. The whole job takes an expert about an hour.