NE Auto Tech

walnut blasting

Intake valve carbon clean

Posted on: May 12th, 2023 by NEAT

Intake valve carbon clean

We carry out Intake valve carbon cleans on TFSI & TSI engines frequently due to build up within the valves. 90% of EU cars being manufactured now use Direct Injection to power the engine. There are so many benefits to manufacturers using Direct Injection, mainly fuel efficiency and power! The EU have more stringent emissions laws than the rest of the world, therefore manufacturers are using this method to push the limits of emission friendly cars to their max potential.

What is Direct Injection?

Most of us get into our cars and it gets us from A-B, and when something goes wrong, we take our car to the garage and trust our mechanic to fix the problem! However, in most cases its beneficial to learn why problems occur and how to stop more problems developing. Direct injection is where the fuel is injected from the HPFP to the injectors and into the combustion chamber. The ECU tells the injectors what intervals to spray the fuel in, at a precise time and position to atomise with the compressed air. This mixture then ignites and turns chemical energy into mechanical energy. At the end of the cycle, the exhaust valves open and release the excess gasses.

So, what are the draw backs?

Unfortunately, Direct injection vehicles are prone to carbon build up, HPFP failure and PCV failure. The PCV valve takes the oil vapours and recycles it into the air intake to give a more environmental burn. However, this is where the mixture can partially end up back into the intake valves resulting in the carbon built up. Sadly, it’s not a 5 minute job to check how built up the valves are with carbon. Therefore, we need to know the warning signs! The build-up of carbon essentially restricts the air flow and stops the vehicle being able to breathe. Signs you need an intake carbon clean include; Noticeable loss in performance, Check engine light on/won’t pass emissions, Poor fuel economy and Rough running. If you’re experiencing these problem and the vehicle has hit the 30,000 miles mark we would advise an intake valve clean. After that first clean, it shouldn’t need carrying out again until 40-50,000 mile intervals.

What method do we choose to clean?

There are a number of ways to clean your intake valves however we prefer methods that don’t damage the valves. If you choosing to manually scrape off the carbon built up your going to scratch the metal which could cause more problems. We choose to use walnut shell. It is soft enough to do no damage, but blasted into the valves at high pressure it removes the carbon built up safely. After your intake valve clean you should immediately see the benefits. These should include, smoother idle, lower fuel consumption and smoother throttle response.

We also advise having your injectors tested and cleaned at the same time as your intake valve clean. You can read our blog outlining the benefits of this ‘here’.

To book in or get a quote call us on 01642 613852. Use our contact form ‘here’ on contact us on Facebook.


ASNU Classic GDI Injector Cleaning

Posted on: December 18th, 2020 by NEAT

We have been undertaking plenty of ASNU Classic GDI injector cleaning recently in the workshop. We advise getting your injectors tested and cleaned along with a carbon intake valve clean. These two jobs go hand in hand. When your valves get a build up of carbon, they in turn start to block the tiny holes on the injectors. When the holes on the injectors get blocked up, the spray pattern becomes irregular between each injector which causes the vehicle to misfire/run lumpy along with various other issues.

The ASNU Injector Cleaning system allows the us to visually examine the injectors, on an individual cycle or in sequential mode. We can then compare the injectors performance under a range of simulated Millisecond & RPM driving cycles, already programmed in to the ASNU system.

Injector cleaning machine

Here’s a slow motion video showing the spray pattern on 4 injectors. As you can see the spray pattern is exactly the same on each injector. This shows that the holes on each injector must be clear of dirt particles.

https://www.youtube.com/watch?v=GBhk_zNQ3_w

The injectors also get a flow test. To do this, test fluid is pumped through the injectors to make sure they allow the same measurement through. We can safely allow a 10% difference between the least measurement, and the most. As you can see on the picture below, this test has shown each injector is working to exactly the same level.

injector testing

ASNU Classic GDI Injector Cleaning

Once they come out of the ASNU Classic GDI Injector Cleaning system, they sit in the built in Ultrasonic Cleaning Bath. As a result, this will clean the outside of the injector and pulse through any particles of dirt.

In conclusion this is just one service carried out by ourselves. One of many that our current and future customers may not know about. Find out more on our services page here: https://www.northeastautotech.com/additional-services/

 

 


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