If your Mercedes-Benz AMG GT63S appears to be a misfiring problem, the possible cause is not always spark plugs, it can also be an injector problem. Here is the tip for beginners to fix this problem by Launch X431 CRP919EBT Elite OBD2 scanner.

Car Info:

2019 Mercedes-Benz AMG GT63S with 470 kilowatt and 638-639 horsepower

Car issue:

The engine doesn’t run smoothly (misfire).

Solution:

Use Launch X431 CRP919E BT to scan and code the car

Step 1: Scan AMG GT63S car

Connect X431 CRP919EBT and vehicle via DBScar VII VCI Connector

Start the car so that have a good battery to operate

Select Intelligent diagnose

Identify the car info successfully

The engine check light flashes on the dashboard

Select Basic Version>> Health Report

Scanning the full system…

It takes a little bit to scan because this car has a lot of modules, but the Launch CRP919EBT goes really fast.

Scanning is finished, and there are two fault codes on the engine ECU.

P030022 Combustion misfiring (the signal amplitude is greater than the maximum amplitude) and P030400 Combustion misfiring of cylinder 4.

What we will do is not go there and replace the spark plug or to order a spark plug

If the diagnotic tell you it’s misfiring, it doesn’t mean the spark plug is bad or the coil no.

What we need to read the live data, and check out the engine is running.

Enter the ME-Motor Electronics

Select Read Data Stream>> Engine Output-Smooth Running of Combustion Engine>> Select All

We should check the injectors first of all, because when you misfiring it can be also injector problem not always spark plugs.

Pay attention to cylinder 4, the value is very huge. You should check the value for the injectors. This is like almost to melt the cylinder inside of the car if you don’t replace it. I mind comparing the values they should be close to zero.

We should replace the injector 4 first time to see if the problem goes from it. Don’t disassemble the engine!

Step 2: Replace the injector

Stop the car, and replace the new injector (we used is Bosch brand here).

The injector code is very important. There are a lot of numbers on it. The first line is the Mercedes number, and the injector code is under it (i.e. 31306). We should put it on the Launch CRP919E BT diagnostic tool after replacing the injecotor.

The injector was replaced. The number 4 is located.

Step 3: Code the injecotor

Select Special Function>> Configuration>> Manual Setting>> Injector Injection quantity adjustment>> 31306 (Injector code)

Follow the on-screen prompt to input the new value

Before coding the injector, we should delete the fault code.

Start the car, it can work normally now.

Launch X431 CRP919E BT/CRP919X BT with DBScar VII:

https://www.eobdtool.co.uk/wholesale/launch-x431-crp919e-bt-diagnostic-tool.html

UK Professional OBD2 Tools Online Shop