xhuli
Member
Hi everyone, I'm Julian I live in France (Strasbourg) and I'm living a nightmare with the famous misfire issue on the A2s.
Here is my story.
I bought an A2 1.6 FSI - 2003 - 98 000 km - Engine code : BAD last month for 1 500€ knowing it had the orange engine light ON (not flashing). Prior to buying it, I dug a little bit and found out the most common repair was replacing a bad ignition coil. So I went ahead and purchased the car, drove it back home. In my way back I drove the most part in the highway and noticed a lack of power when I tried to push it more or when encountering slopes. The engine light, ON at that time, began to flash as soon as I demanded more power from the car. Then I would take off my foot from the throttle pedal and go gently with it. This is how I made the trip back home.
Next day, I put the VCDS on and found the following error codes :
3 Faults Found:
- 16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
- 16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
- 17912 - Intake Air System: Leak Detected
P1504 - 35-10 - - - Intermittent
So I thought, great I can just buy an Ignition Coil and the issue would be resolved. Prior to buying the part, just to be sure, I inverted the coils between cylinder 3 and 4. The error misfire went to cylinder 4 so I thought yep it's definitely the coil. I went ahead and replaced the coil (BOSCH 0 986 221 023)
on cylinder 3 but then cylinder 4 now would misfire, I was like what the heck is going on.
I then replaced all four Spark Plugs (BOSCH 0 242 240 590) but the same error would remain on cylinder 4. It was at that moment I realized the problem could be much more serious.
So I decided to dig a little deeper an found these FSI engines are prone to carbon build up in the back of the intake valves which could let less air in the cylinder or air wrongly distributed and thus causing a bad combustion. It made sense at the time and everyone on internet seems to agree on this issue.
I was at a crossroad here, either I would do this myself or let a mechanic properly diagnose it. I went for the second option, the mechanic. He did a compression test and told me cylinder 3 was lower than the others but it was acceptable not to worry that much. He also told me that he had a problem adapting/aligning the Intake Throttle Body (OEM 036 133 062 D), I had no clue what it was at that time. The car stayed at his workshop for two weeks with no updates but meanwhile, I don't now why, I was preparing mentally to do all the necessary work myself. I gathered all the necessary infos, workshop manuals, adaptation, tools etc. The mechanic guy didn't do anything more that I already told you by that time and frustrated as I was I took the car back home.
So today, we are two weeks later since I took the car back home and did the following work :
- 1 Ignition Coil replaced - BOSCH 0 986 221 023 - OEM 036 905 715 G
- All 4 Spark Plugs replaced - BOSCH 0 242 240 590 - OEM 101 000 068 AA
- Cleaned and checked :
- Vacuum Control Actuator, OK, leg not broken and retains pressure - OEM 036 129 061 A
- Throttle Valve Flap Potentiometer, seems to be operating ok - OEM 036 907 385 C (G336)
- Air Mass Flow Meter Sensor cleaned - OEM 057 906 461 AX (G70)
- Intake Valve chamber and back of the valves in cylinder head cleaned - OEM 036 109 601 AD
- Injector hole/housing in cylinder head cleaned with a nylon brush
- Injectors cleaned and tested - OEM 036 906 036
- Intake Manifold - Lower part, flaps cleaned and lubed - OEM 036 133 204 K
- Intake Manifold - Upper part cleaned - OEM 036 1298 711 FK
- Vacuum Hose Non-Return Valve, OK - OEM 046 905 291 A
- Exhaust Gas Recirculation (EGR) Valve cleaned - OEM 036 131 503 AD (N18)
- Intake Throttle Body cleaned - OEM 036 133 062 D (J338)
- All connectors cleaned
- Fuses, OK
- Wiring, OK
- Cleaned some earth points, especially the one under the driver's headlight, not oxidized and not broken
- All gaskets replaced :
- AJUSA 13186600 - OEM 03C 129 717 C
- AJUSA 13186700 - OEM 036 129 717 K
- OEM 036 133 073 R
- OEM 036 133 073 Q
- OEM 036 131 550 C
- OEM 036 133 073 F
- Change-Over Flap Valve replaced - BUGIAD BSP25111 or PIERBURG 7.28098.04.0 - OEM 037 906 283 D (N316)
- Vacuum Hoses replaced :
- OEM 036 133 784 J
- OEM 036 133 784 K
- OEM 036 133 773 H
- Intake Manifold Pressure Sensor replaced - METZGER 0906221 - OEM 036 906 051 F (G71)
- Intake Manifold Pressure Brake Booster Sensor replaced - BOSCH 0 261 230 081 - OEM 036 906 051 G
- Vapor Canister Purge Activated Charcoal Filter System Valve replaced - BOSCH 0 280 142 347 - OEM 058 133 517 B (N80)
- Hall Sensor replaced - HELLA 6PU 009 121-451 - OEM 036 906 455 A (G40)
- Injector replaced - BOSCH 0 261 500 005 - OEM 036 906 036
- 4 Injector seals kit replaced - BOSCH F 00V H35 001 - OEM 036 198 149
- 4 Insert Injector seals/o'ring replaced - TOPRAN 111 414 - OEM 035 906 149 A
- Fuel Pressure Sensor replaced - RIDEX 3942S0003 - OEM 06D 906 051 A (G247)
- Fuel Pressure Metering Valve replaced - BOSCH 0 280 160 557 - OEM 037 133 035 C (N290)
- Fuel Filter replaced - BOSCH 0 450 905 316 - OEM 6X0 201 511 B
- Cap Fuel Tank replaced - FEBI-BILSTEIN 27288 - OEM 1J0 201 550 AS
- Air Filter replaced - BOSCH 1 457 433 538 - OEM 8Z0 129 620
- Oil Filter replaced - BOSCH 0 451 103 318 - OEM 030 115 561 AB
- Dust and Pollen Filter replaced - BOSCH 1 987 432 357 - OEM 6Q0 819 653
- Coolant Temperature Sensor replaced - STARK SKCTS-0850018 - OEM 06A 919 501 A (G83 - 2 Pin - Gray - This one communicates with the ECU)
- Drained the fuel as I was not sure what the car had in it before and put some AGIP SP98 Tech+.
When reassembling I plugged in VCDS went to Engine Module, Cleared Codes, Basic Settings and did the following adaptations in this order :
- MVB* 060 - Throttle Body Adaptation, ADP RUN then OK
- MVB* 142 - Intake Manifold Flaps Adaptation, ADP RUN then OK (put a pin on the Vacuum Control Actuator when reassembling)
- MVB* 074 - Exhaust Gas Recirculation Adaptation, ADP RUN then OK
*Measured Value Block
After replacing all those parts and following these minute procedures I still have a misfire problem at cold and at warm temperature. The engine idle is not great, it's like before I did all the replacements, the car shakes. I still have the same error codes but on cylinder 4 now.
3 Faults Found:
- 16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
- 16688 - Cylinder 4 Misfire Detected ---------------- Engine Light flashing when I really push the car at high RPMs
P0304 - 35-00 - -
- 17912 - Intake Air System: Leak Detected ----------- This error appears when I really push the car at high RPMs
P1504 - 35-10 - - - Intermittent
I was so mad at this point. Checked again with VCDS cylinder misfire count MVB 016 and indeed cylinder 4 was misfiring a lot. I decided then to take the Coil cyl. 4 and put it to the other cylinders and the error followed the bad coil. My guess now is that I believe that I had more than one bad coil to begin with. I should have just bought a pack of 4 Ignition Coils (I was in the cheap side in the beginning). So, as I already replaced one coil my next step is buying three others and maybe a pack of 4 Iridium Spark Plugs DENSO 4702 IK20TT.
It should come in 2 or 3 days max and I will let you know if the issue will be resolved.
What I might be doing in the next days, will be a proper compression test and run a fuel trim short/long diagnostic. Might also check the EGR metal hose/tube if there isn't any leak there.
What do you guys think of what might resolve my issue? Any help is welcomed, I'm on the brink of giving up here.
Here is my story.
I bought an A2 1.6 FSI - 2003 - 98 000 km - Engine code : BAD last month for 1 500€ knowing it had the orange engine light ON (not flashing). Prior to buying it, I dug a little bit and found out the most common repair was replacing a bad ignition coil. So I went ahead and purchased the car, drove it back home. In my way back I drove the most part in the highway and noticed a lack of power when I tried to push it more or when encountering slopes. The engine light, ON at that time, began to flash as soon as I demanded more power from the car. Then I would take off my foot from the throttle pedal and go gently with it. This is how I made the trip back home.
Next day, I put the VCDS on and found the following error codes :
3 Faults Found:
- 16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
- 16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
- 17912 - Intake Air System: Leak Detected
P1504 - 35-10 - - - Intermittent
So I thought, great I can just buy an Ignition Coil and the issue would be resolved. Prior to buying the part, just to be sure, I inverted the coils between cylinder 3 and 4. The error misfire went to cylinder 4 so I thought yep it's definitely the coil. I went ahead and replaced the coil (BOSCH 0 986 221 023)
on cylinder 3 but then cylinder 4 now would misfire, I was like what the heck is going on.
I then replaced all four Spark Plugs (BOSCH 0 242 240 590) but the same error would remain on cylinder 4. It was at that moment I realized the problem could be much more serious.
So I decided to dig a little deeper an found these FSI engines are prone to carbon build up in the back of the intake valves which could let less air in the cylinder or air wrongly distributed and thus causing a bad combustion. It made sense at the time and everyone on internet seems to agree on this issue.
I was at a crossroad here, either I would do this myself or let a mechanic properly diagnose it. I went for the second option, the mechanic. He did a compression test and told me cylinder 3 was lower than the others but it was acceptable not to worry that much. He also told me that he had a problem adapting/aligning the Intake Throttle Body (OEM 036 133 062 D), I had no clue what it was at that time. The car stayed at his workshop for two weeks with no updates but meanwhile, I don't now why, I was preparing mentally to do all the necessary work myself. I gathered all the necessary infos, workshop manuals, adaptation, tools etc. The mechanic guy didn't do anything more that I already told you by that time and frustrated as I was I took the car back home.
So today, we are two weeks later since I took the car back home and did the following work :
- 1 Ignition Coil replaced - BOSCH 0 986 221 023 - OEM 036 905 715 G
- All 4 Spark Plugs replaced - BOSCH 0 242 240 590 - OEM 101 000 068 AA
- Cleaned and checked :
- Vacuum Control Actuator, OK, leg not broken and retains pressure - OEM 036 129 061 A
- Throttle Valve Flap Potentiometer, seems to be operating ok - OEM 036 907 385 C (G336)
- Air Mass Flow Meter Sensor cleaned - OEM 057 906 461 AX (G70)
- Intake Valve chamber and back of the valves in cylinder head cleaned - OEM 036 109 601 AD
- Injector hole/housing in cylinder head cleaned with a nylon brush
- Injectors cleaned and tested - OEM 036 906 036
- Intake Manifold - Lower part, flaps cleaned and lubed - OEM 036 133 204 K
- Intake Manifold - Upper part cleaned - OEM 036 1298 711 FK
- Vacuum Hose Non-Return Valve, OK - OEM 046 905 291 A
- Exhaust Gas Recirculation (EGR) Valve cleaned - OEM 036 131 503 AD (N18)
- Intake Throttle Body cleaned - OEM 036 133 062 D (J338)
- All connectors cleaned
- Fuses, OK
- Wiring, OK
- Cleaned some earth points, especially the one under the driver's headlight, not oxidized and not broken
- All gaskets replaced :
- AJUSA 13186600 - OEM 03C 129 717 C
- AJUSA 13186700 - OEM 036 129 717 K
- OEM 036 133 073 R
- OEM 036 133 073 Q
- OEM 036 131 550 C
- OEM 036 133 073 F
- Change-Over Flap Valve replaced - BUGIAD BSP25111 or PIERBURG 7.28098.04.0 - OEM 037 906 283 D (N316)
- Vacuum Hoses replaced :
- OEM 036 133 784 J
- OEM 036 133 784 K
- OEM 036 133 773 H
- Intake Manifold Pressure Sensor replaced - METZGER 0906221 - OEM 036 906 051 F (G71)
- Intake Manifold Pressure Brake Booster Sensor replaced - BOSCH 0 261 230 081 - OEM 036 906 051 G
- Vapor Canister Purge Activated Charcoal Filter System Valve replaced - BOSCH 0 280 142 347 - OEM 058 133 517 B (N80)
- Hall Sensor replaced - HELLA 6PU 009 121-451 - OEM 036 906 455 A (G40)
- Injector replaced - BOSCH 0 261 500 005 - OEM 036 906 036
- 4 Injector seals kit replaced - BOSCH F 00V H35 001 - OEM 036 198 149
- 4 Insert Injector seals/o'ring replaced - TOPRAN 111 414 - OEM 035 906 149 A
- Fuel Pressure Sensor replaced - RIDEX 3942S0003 - OEM 06D 906 051 A (G247)
- Fuel Pressure Metering Valve replaced - BOSCH 0 280 160 557 - OEM 037 133 035 C (N290)
- Fuel Filter replaced - BOSCH 0 450 905 316 - OEM 6X0 201 511 B
- Cap Fuel Tank replaced - FEBI-BILSTEIN 27288 - OEM 1J0 201 550 AS
- Air Filter replaced - BOSCH 1 457 433 538 - OEM 8Z0 129 620
- Oil Filter replaced - BOSCH 0 451 103 318 - OEM 030 115 561 AB
- Dust and Pollen Filter replaced - BOSCH 1 987 432 357 - OEM 6Q0 819 653
- Coolant Temperature Sensor replaced - STARK SKCTS-0850018 - OEM 06A 919 501 A (G83 - 2 Pin - Gray - This one communicates with the ECU)
- Drained the fuel as I was not sure what the car had in it before and put some AGIP SP98 Tech+.
When reassembling I plugged in VCDS went to Engine Module, Cleared Codes, Basic Settings and did the following adaptations in this order :
- MVB* 060 - Throttle Body Adaptation, ADP RUN then OK
- MVB* 142 - Intake Manifold Flaps Adaptation, ADP RUN then OK (put a pin on the Vacuum Control Actuator when reassembling)
- MVB* 074 - Exhaust Gas Recirculation Adaptation, ADP RUN then OK
*Measured Value Block
After replacing all those parts and following these minute procedures I still have a misfire problem at cold and at warm temperature. The engine idle is not great, it's like before I did all the replacements, the car shakes. I still have the same error codes but on cylinder 4 now.
3 Faults Found:
- 16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
- 16688 - Cylinder 4 Misfire Detected ---------------- Engine Light flashing when I really push the car at high RPMs
P0304 - 35-00 - -
- 17912 - Intake Air System: Leak Detected ----------- This error appears when I really push the car at high RPMs
P1504 - 35-10 - - - Intermittent
I was so mad at this point. Checked again with VCDS cylinder misfire count MVB 016 and indeed cylinder 4 was misfiring a lot. I decided then to take the Coil cyl. 4 and put it to the other cylinders and the error followed the bad coil. My guess now is that I believe that I had more than one bad coil to begin with. I should have just bought a pack of 4 Ignition Coils (I was in the cheap side in the beginning). So, as I already replaced one coil my next step is buying three others and maybe a pack of 4 Iridium Spark Plugs DENSO 4702 IK20TT.
It should come in 2 or 3 days max and I will let you know if the issue will be resolved.
What I might be doing in the next days, will be a proper compression test and run a fuel trim short/long diagnostic. Might also check the EGR metal hose/tube if there isn't any leak there.
What do you guys think of what might resolve my issue? Any help is welcomed, I'm on the brink of giving up here.
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