Hi All,
I'm having some serious issues with my a4, the EPC light was coming on when getting to 2000rpm then if I ignore it and push through it goes into limp mode and eventually ultra limp (nothing there at all, but doesnt conk out).
If I drove it below 2000rpm it was usable most of the time but no doubt not doing it any good!
The car has a custom turbo (K04 internals) but hasn't been mapped in yet (probably caused some of this!!)
I did scans and 17579 kept coming back when clearning.
I've lived with 17535 for a while awaiting the remap (too rich).
I've now;
The codes and assumptions are;
Missfires
These I guess are a result of the actual issue, so can pretty much overlook them.
Remaining codes
So I'm about to go out and work through these, clearing codes each time and staritng car;
I'll post progress here so a future me in this situation doesnt give up on their struggling engine.
Thanks.
I'm having some serious issues with my a4, the EPC light was coming on when getting to 2000rpm then if I ignore it and push through it goes into limp mode and eventually ultra limp (nothing there at all, but doesnt conk out).
If I drove it below 2000rpm it was usable most of the time but no doubt not doing it any good!
The car has a custom turbo (K04 internals) but hasn't been mapped in yet (probably caused some of this!!)
I did scans and 17579 kept coming back when clearning.
I've lived with 17535 for a while awaiting the remap (too rich).
I've now;
- Changed Crank Sensor - this seemed to make it start far quicker, but not fix the issue.
- Cleaned TB flap and internal electrical bits - made no difference.
- Replaced TB with one from a friend - made idle far worse but feels more responsive (circuit better perhaps).
- unplugged the N75 - This obviously gave me practically no boost but was driveable, it didnt fix the issue as its only when pushing a bit more.
The codes and assumptions are;
Missfires
- 16686 - Cyl 2
- 16688 - Cyl 4
- 16684 - Cyl 3
These I guess are a result of the actual issue, so can pretty much overlook them.
Remaining codes
- 17705 - N75/Throttle pedal switch?/VAC leak
- 16497 - Air intake sensor/Fuse (is this the one beside the TB?
- 17956 - N75
- 17950 - Wiring to throttle angle sensor/battery ground/02 Sensor wiring
- 17579 - Same as above...
So I'm about to go out and work through these, clearing codes each time and staritng car;
- Check wiring to throttle angle sensor, pull sensor out and give it a quick drying electrical spray
- Check battery earth
- Change all Spark plugs - Havent changed them for 2 services so worth doing anyway.
- Swap N75 with one I know is good.
- Remove all PCV pipework from turbo area and inspect for issues.
- swap electrical bits from newer TB to old.
I'll post progress here so a future me in this situation doesnt give up on their struggling engine.
Thanks.