Why its required?
Engine carbon deposits have a measurable effect on performance, emissions and fuel economy. Routine carbon cleaning has been shown to prevent these problems, and remedial cleaning removes more severe deposits that have already formed.
Carbon deposits have been a problem for the Internal combustion engine since it was invented. It is a known fact that carbon deposits in Internal Combustion Engines reduce engine performance, reduce fuel efficiency, shorten engine/equipment/parts life and increase engine out emissions.
In the quest to improve engine performance, reduce pollutants in the atmosphere and increase engine fuel efficiency. Governments all over the world are increasing emission regulations.
To meet these ever increasing regulations manufacturers are employing additional emission controls to the Internal Combustion engines. Simply put, the manufactures are asking the Internal combustion engine to do more things than it was ever designed to do. As a result, the carbon deposit problem has become more frequent and severe, creating a whole new set of problems and challenges.
The effect of carbon cleaning on your Engine is dependent on how “dirty” the engine is.This is down to a number of different things, driving style, mileage, fuel used etc.
The below list will give you an idea of whether it’s something you would be likely to benefit from.
1) Constant Low rev driving.
2) Short journeys.
3) Lots of stop-start journeys.
4) Long idling.
5) Poor quality fuel
I.E. IF the engine doesn’t get worked hard & hot, then yes it will most likely have more carbon build up. Taxis and buses are worst as they are sat idling and often short stop-start journeys at low MPH/revs .
IF your car is suffering reduced MPG and IF the cause is carbon build up then yes the engine clean should recover/reclaim that MPG lost due to the systems being dirty.
IF (and it’s always a IF) ANY aspect of your cars performance (noise, roughness, idling, hunting, MPG lower, emissions, flat spots, throttle response, sticking EGR/throttle body/swirl flaps) are affected from carbon build up then the Carbon Cleaning will have a positive effect.
Of course, IF any mechanical aspect (swirl flaps for example or EGR valve,turbo) has seized/blocked completely or broken then no amount of carbon cleaning will sort it.
Carbon cleaning can’t fix things that are fully blocked or broken these would need to be replaced,stripped and cleaned, fixed.
All a carbon clean can do is exactly that. Clean, it’s not magic if it’s dirty it will help, if it’s not dirty it won’t.
What it will help do if your engine is clean, is prevent carbon build up so your engine remains clean (look at it like preventative maintenance you’re stopping issues before they can start)