I have a slight misfire when cold that starts a few minutes after the car has been started.
The car has been scanned with VCDS and no related fault codes came up. I have a 3.0 tdi quattro.
Running tests on the injectors using VCDS (using test blocks 13 and 14) comes up with the following:
After 1 minute of running all seems normal:
(6 injector readings)
0.66 mg/str | 0.24 mg/str | -0.80 mg/str | -0.33 mg/str | 0.00 mg/str | 0.28 mg/str
After 2/3 minutes of running we now encounter a slight misfire and the readings are:
-1.18 mg/str| 0.61 mg/str | -1.88 mg/str | -1.60 mg/str | 5.04 mg/str | -1.08 mg/str
When the car is warm (another ~5 minutes later) the car drives perfectly and the readings are:
0.14 mg/str | 0.24 mg/str | -0.38 mg/str | -0.19 mg/str | 0.14 mg/str | 0.00 mg/str
To me, this shows that 1 injector is playing up when cold. But why? Is it the injector, the wiring loom, the ECU, the injector seal, something else? Any ideas fellas, I'd love to get this fixed.
Are there any easy tests or changes I can do to rule out a few things?