Help diagnosing misfire / stumble - stock 125TSI

[Nick125tsi]

I was wondering if anybody can assist advice on trouble shooting an issue I have with a 2008 manual 125TSI Tiguan with 85,000kms.

The car developed a misfire or more specifically a stumble from 2000 RPM to 3000RPM only on light throttle. However the car idles perfectly and pulls like a train with no misfire at WOT. The issue only occurs at light throttle only. The car is 100% stock.

The car showed the following codes:

_____________________
Address 01: Engine (CAW) Labels: 06J-906-026-CAW.clb
Part No SW: 06J 906 026 AA HW: 06J 906 026 D
Component: MED17.5 3171
Revision: A7H06--- Serial number: VWX7Z0HN3NQ7UQ
Coding: 04230003180F0160
Shop #: WSC 01324 785 00200
VCID: 69F75865409FA95623D-803C

3 Faults Found:
000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 000 - - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 13
Reset counter: 255
Mileage: 83568 km
Time Indication: 0
Date: 2000.00.00
Time: 11:23:04

Freeze Frame:
RPM: 2757 /min
Load: 31.0 %
Speed: 18.0 km/h
Temperature: 29.0°C
Temperature: 20.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.224 V

000770 - Cylinder 2
P0302 - 000 - Misfire Detected - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 13
Reset counter: 255
Mileage: 83568 km
Time Indication: 0
Date: 2000.00.00
Time: 11:23:04

Freeze Frame:
RPM: 2757 /min
Load: 31.0 %
Speed: 18.0 km/h
Temperature: 29.0°C
Temperature: 20.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.224 V

000772 - Cylinder 4
P0304 - 000 - Misfire Detected
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 83797 km
Time Indication: 0
Date: 2000.00.00
Time: 17:39:38

Freeze Frame:
RPM: 1081 /min
Load: 32.5 %
Speed: 13.0 km/h
Temperature: 50.0°C
Temperature: 36.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.097 V

Readiness: 0000 0000

__________________________________

I cleared the codes and changed all 4 spark plugs and coils and it improved the issue significantly - however it has not fixed it totally.

The stumble is starting to come back after 100kms driving. The engine light has come on for a second time with errors P0301 & P0302 (misfire cylinder 1 & 2).

Does anybody have advice on what to try next? or where to get quality trouble shooting information?

Thanks in advance
Nick

[Ramee]

Could be an Intake valves carbon build up issue..
Intake valve carbon cleaning for the 2.0TFSI and 4.2FSI.

[Nick125tsi]

Update on the issue. I cleaned the maf sensor with carby cleaner and it has significantly improved the stumble/misfire.

[kroogz]

I posted a similar thread, 2500-3000 RPM stumble/hesitation on light throttle. I cleaned the MAF, seemed a little better, but I think I may change the plugs as well.

[kroogz]

Also - just had my 60k service done, but spark plugs were not changed. I see mixed reports on whether these should be done at the 60k?

[Wynnston]

I would have thought that plugs would be good for 100k on a stock engine.