[PAGTI]

The car was misfiring badly and when hooked up to the VAG COM read multiple random misfires and cyl 6 misfire. I bought a Huac coilpack replacement and installed it. The car started after a little hesitation and ran for a day without any problems. Also after installing the new coil pack it threw a check engine light and gave some random codes saying some of the coil voltages were too low but it still ran just fine. Now the car wont start and when scanned came back with these codes.


Address 01: Engine Labels: 021-906-018-AFP.lbl
Control Module Part Number: 021 906 018 A
Component and/or Version: MOTRONIC ME7.1 G 6781
Software Coding: 00001
Work Shop Code: WSC 06417
14 Faults Found:

17645 - Fuel Injector for Cylinder 1 (N30): Open Circuit
P1237 - 35-10 - - - Intermittent
17649 - Fuel Injector for Cylinder 5 (N83): Open Circuit
P1241 - 35-10 - - - Intermittent
17647 - Fuel Injector for Cylinder 3 (N32): Open Circuit
P1239 - 35-10 - - - Intermittent
17650 - Fuel Injector for Cylinder 6 (N84): Open Circuit
P1242 - 35-10 - - - Intermittent
17834 - EVAP Purge Valve (N80): Open Circuit
P1426 - 35-10 - - - Intermittent
17881 - EVAP Leak Detection Pump: Open Circuit
P1473 - 35-10 - - - Intermittent
17841 - Secondary Air Pump Relay (J299): Open Circuit
P1433 - 35-10 - - - Intermittent
17840 - Secondary Air Injection Solenoid Valve (N112): Open Circuit
P1432 - 35-10 - - - Intermittent
17648 - Fuel Injector for Cylinder 4 (N33): Open Circuit
P1240 - 35-10 - - - Intermittent
17924 - Intake Manifold Valve (N156): Open Circuit
P1516 - 35-10 - - - Intermittent
17646 - Fuel Injector for Cylinder 2 (N31): Open Circuit
P1238 - 35-10 - - - Intermittent
17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit
P1118 - 35-10 - - - Intermittent

I reinstalled the old coilpack and it started right up with the exception of the misfire.

Any ideas? Does something need to be reset when changing a coilpack?


Thanks in advance!

 

[Scotty_2.0]

No kind of reset required after coil replacement. How are the wires..? See alot of people overlooking wires and throwing coils in first.... If you can, remove the engine covers to allow for extra slack in the plug wires. Then try swapping plug wires of similar length to see if the misfire follows suit.

That being said, I would look at the possible cause of all those injector faults. Ignition may not be the actual problem. Not likely that more than one injector has crapped out, so I'd check out the wiring harness. You may need to break out the Bentley if you don't find anything obvious.

 

[PAGTI]

Thanks for the advice. The strange thing is when the new pack worked for the day it had no misfires. That makes me think that its not wires or injectors. I just dont understand why it would work for a day then not start until the old pack was reinstalled. It may be a loose harness to make all of those systems fail the same way but when the old pack was installed everything worked fine again.

Im kinda at a loss on what to really try next other than getting a different coil pack?

 

[Kenji]

You could have a bad ground connection somewhere.

 

[PAGTI]

Thats a good point, ill try that. But the strange thing is this problem happened once before in the exact same way. The way i got it to run was to fix the old coilpack with epoxy but its too far gone now.