In most modern cars, fuel passes through nozzles called fuel injectors before it is ignited inside the combustion chamber. If these are blocked or coated with deposits, you could experience hesitation and stumbling upon acceleration.
Combustion chamber deposits can also contribute to run-on, the annoying occurrence when you switch off the ignition and the engine stumbles a few times before switching off.
Volatility, or a fuel's tendency to vaporise, is the key characteristic for a smooth ride, also known as 'drivability'. Drivability describes how easily your car starts, warms up, drives and accelerates. When the spray pattern of fuel from the fuel injector is restricted in any way, the vaporisation can be negatively affected. That has serious implications on your car's drivability because only fuel vapor actually burns. It doesn't burn at all in liquid form.
Caltex with Techron® is proven at cleaning vital engine parts. It also minimises the contribution to harmful combustion chamber deposits, helping your engine maintain the maximum performance for which it was designed.
Port fuel injector (PFI) deposits form during the hot soak period after the engine has been turned off. The stationary gasoline trapped in the injector tip is exposed to a higher temperature for a longer time than the fuel that flowed through the injector when the engine was running. The heat degrades the fuel, initiating deposit formation. In the absence of an effective additive, injector deposits can form quite rapidly if the car is used predominantly for short trips.
Cold-start and warm-up drivability can be adversely affected as intake valve deposits can act somewhat like a sponge, absorbing and then releasing fuel, which upsets the ratio of fuel and air, particularly as the engine is changing speed.
Other valve deposit problems include valve sticking caused by deposits interfering with the valve stem sliding in its guide.