Does your European vehicle lack power or run rough? It may just need some walnuts. Trust us – we’re not nuts (pun intended). Walnut blasting is a method of engine cleaning that’s promoted by automakers, such as BMW, MINI, VW, and Audi. The procedure is a proven remedy for many different performance problems.
What is walnut shell blasting?
Over time, carbon accumulates on the back of your engine’s intake valves. Walnut blasting uses abrasive walnut shell media to get rid of these deposits. The process can also be used for intake manifold cleaning and combustion chamber cleaning (if the cylinder head is removed).
Walnut blasting has been known to cure the following symptoms:
- Check engine light
- Lack of power
- Bumpy idle
- Engine misfires
- Engine oil consumption
It’s astounding that a seed from a genus Juglans tree has the potential to correct all these issues. But, it’s true.
Which vehicles benefit most from walnut shell carbon cleaning?
In the past, almost all cars used a method of fuel delivery called port injection. With this design, gasoline is first squirted into the engine intake manifold. It then combines with air before entering the combustion chamber through the intake valves. This layout allows fuel to wash over the backside of the valves, cleaning them.
Many modern vehicles – especially European models – are direct injected (DI). This design squirts fuel directly into the combustion chamber. As a result, it does not get a chance to clean the intake valves or intake manifold. Eventually, this leads to increased carbon build-up that can cause the valves to stick open (and in some cases, restrict the intake manifold).
Stuck open valves lead to incomplete combustion. This issue can cause all of the symptoms mentioned earlier (check engine warning light, engine misfires, etc.). Eventually, it can also lead to burnt valves and a costly repair bill. To prevent this from happening, a good rule of thumb for all DI European vehicles is to have walnut blasting performed every 30,000 miles.
Walnut blasting procedure
This is not a job you should try at home. If performed incorrectly, shell can fall into the engine. This scenario is as bad as it sounds – high-dollar damage can occur. Walnut blasting should only be done by a professional, such as a technician from Euro Fix.
Valve deposit blasting involves the following steps:
- Before blasting can begin, the technician must remove the intake manifold. This by itself is a challenging job that can take hours.
- Next, the technician will block off all but one of the intake ports in the cylinder head. The engine is then turned over by hand to close the valves on the remaining open port.
- Once the valves are closed, blasting can begin. A special tool is filled with walnut blasting material. Then, a vacuum hose with an adapter hole is placed over the intake port. The vacuum is turned on, and the blasting wand is inserted into the adapter hole. A trigger is pulled on the wand to shoot ground walnut shell against the back of the intake valves. This is done until the valves are cleaned of carbon.
- The walnut blasting procedure is performed one cylinder at a time for each remaining cylinder.
After the job is complete, your engine’s intake valves will be sparklingly clean.
Schedule walnut blasting with Euro Fix
You wouldn’t neglect regular service like an oil change. So, why would you forgo essential maintenance, like walnut blasting? Protect your vehicle and keep it performing its best by scheduling an appointment with Euro Fix today.
Meta: Walnut shell blasting is essential maintenance that keeps your vehicle running right. The process can also cure drivability problems, such as poor performance and an illuminated check engine light.