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Direct Injection Engine - Intake Valve Cleaning


Lotr
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That's why now engines run on both MPI multi-port fuel injection and direct fuel injection. MPI runs during engine idling which the air fuel mixture can clean the valves and then transit to DFI running with load. No good thing is the extra fuel injectors mounted at the air intake manifold...extra cost.

 

As for EGR or exhaust gas return system the diesel engines will have more carbon deposits clogging issues on the EGR valve and air intake valves. Petrol engines that has EGR system seem less likely to have an issue. There are EGR delete kits available on sale in online shops but mostly for diesel engines.

 

Another potentially messing up the air intake valves is the PCV return or positive crankcase valve. Its function to divert engine oil/fuel vapours and blow-by back to the air intake pipe. Either use an oil catch can/tank to collect the sticky gunk or redirect it to the oil pan. The amount is not large but it causes the air instake valves to become sticky and collect the carbon deposits from the EGR.

 

 

There are a few ways to clean the air intake valves if there lots of carbon deposits sitting on it.

One of them is the biodegradable sand blasting ppl here mentioned earlier which requires some manpower to remove the air intake manifold in order to reach the intake valves to do the blasting to clear the carbon deposits.

 

Other is using hydrogen gas to run the engine and clear it of any carbon deposits in the engine not just the valves. Less labour intensive as dont have to dismantle any engine parts. How thorough is the cleaning, I dont know.

 

The last is to remove the engine head and take out the valves to clean them thoroughly. This involves more labour and time of course.

 

The simplest EGR delete kit is 2 piece of aluminium cover.

 

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With the right carbon cleaning detergent and this simple tool, shops should be able to do a reasonable good work in improving engines performance.

 

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