GJ-Molestor
Banned
- :
- 2011 BMW 528i, 2015 Mazda 6, 1995 Nissan Maxima Manual
Hey everyone, thought I would bring an inherit issue of our direct injection motors to light and make sure people are aware of this.
For a long time, fuel systems were port injected, meaning that the gasoline would flow through the intake valves. Gasoline acts as a detergent so it would clean the intake ports which made carbon buildup non exsistant.
More recently, cars have switched to direct injection which directly sprays fuel into the combustion chamber at a higher pressure for a cleaner, burn and more torque. As a result, carbon now builds up on these valves.
You will notice closer to 60k Miles that the engine may not run as smooth as before particularly at low RPM, fuel economy will drop a little and the engine will not sound as smooth as before. If you are a conservative driver and dont get onto the throttle often, the buildup will occur much faster. Changing your oil more frequently, roughly every 5000 Miles also helps.
There is one thing you can do to help delay the buildup of excess carbon on your valves. I recommend bringing the engine up to redline once a week in a slow, smooth pull to help clear out the carbon.
My dad never revs the car past 3k RPM, and you can feel it affecting the motor. Whenever I get an opportunity to drive the car, I do 2-3 redlines In a row and If you have your window down, you can smell the huge amount of s*** that you just cleared out of your engine and exhaust. The smell is truly very strong and the engine runs smoother then before right afterwards.
Occasionally winding out your motor (2-4 times a month) will slow the buildup of carbon considerably. Those of you who never do this, I suggest trying it today on the highway with the window open. The exhaust smells terrible the first 2-3 times until you clear It out and you will feel the engine run smoother.
For a long time, fuel systems were port injected, meaning that the gasoline would flow through the intake valves. Gasoline acts as a detergent so it would clean the intake ports which made carbon buildup non exsistant.
More recently, cars have switched to direct injection which directly sprays fuel into the combustion chamber at a higher pressure for a cleaner, burn and more torque. As a result, carbon now builds up on these valves.
You will notice closer to 60k Miles that the engine may not run as smooth as before particularly at low RPM, fuel economy will drop a little and the engine will not sound as smooth as before. If you are a conservative driver and dont get onto the throttle often, the buildup will occur much faster. Changing your oil more frequently, roughly every 5000 Miles also helps.
There is one thing you can do to help delay the buildup of excess carbon on your valves. I recommend bringing the engine up to redline once a week in a slow, smooth pull to help clear out the carbon.
My dad never revs the car past 3k RPM, and you can feel it affecting the motor. Whenever I get an opportunity to drive the car, I do 2-3 redlines In a row and If you have your window down, you can smell the huge amount of s*** that you just cleared out of your engine and exhaust. The smell is truly very strong and the engine runs smoother then before right afterwards.
Occasionally winding out your motor (2-4 times a month) will slow the buildup of carbon considerably. Those of you who never do this, I suggest trying it today on the highway with the window open. The exhaust smells terrible the first 2-3 times until you clear It out and you will feel the engine run smoother.
