Customers will come to Mutiara Motorsports on a regular basis to complain about the issue of their vehicle. The details submitted by the customer about the car's issue will be noted by the service advisor. Then, a repair order sheet is prepared by the service advisor and passed on to the technician performing the diagnosis part. To evaluate and solve the vehicle dilemma, this section needs highly qualified and experienced experts. I got the chance to learn from them some things. All I can do is watch them do work later when their job is done and ask them questions.
The first car’s problem that I learned is Toyota Avanza is having a problem when this car jerking when accelerating and lack of power when it droves. Technicians always teach me that whenever a car got a problem especially an engine, always their coils and spark plugs. So, they checked the coils and spark plugs and their expectation was right. All of the spark plugs are completely burn at the tip but one of them got an oil mark on it while two coils have an oil mark and blue mark.
Figure 26: Spark plug completely burned
The cause of this problem is that the spark plugs are not tight enough thus it affects the internal combustion in the engine. Based on my research from the internet, 90% of spark plug damage claims are due to improper torque. Proper installation torque is critical in the plug’s ability to dissipate heat out of the combustion chamber and into the cylinder head. Not using a torque wrench when installing plugs can lead to over-torquing or under-torquing a spark plug, which will cause damage to the plug and possibly the engine. So, the solution is to replace all spark plugs and coils. The technicians must install the spark plugs with proper torque to avoid further damage to the engine.