2006 1.8T 6at old Sagitar idle jitter problem investigation.

  10
 September 5, 2024
I bought a 5-hand old Sagitar. The 1.8T 6T engine was introduced by the EA1113. This was the earliest old Jetta 5. After it was introduced into China, this machine renamed Sutang was much more worry-free than the latter 888.
So I bought this machine. The owner of the entire car renovated the interior. The timing belt and spark plug were replaced.
After driving for about 300 kilometers, I found that the idling cold car shook violently. I used the diagnostic instrument OBD to take a look.
The following problems were found.
1. Tank 4 is out of fire.
2. Brake vacuum pump is open.
3. The idle speed fluctuates, and the reading light in the car flashes on and off.

The reasons for problem investigation and process will be continuously recorded later. Know the final solution.