Hello,
As I mentioned in my welcome post, here it is... description of the non starting tfsi bwa on a3.
I got it with following symptoms:
- key in
- ignition on (position II)
- big fat NOTHING, not even a light dim...
1. I started diagnostics with relays and fuses. All been good.
2. Next step was to disconnect signal cable to starter solenoid.
3. Tested for 12V when key turned to start(position III) - result was ok. 12V available.
4. Next step; starter removal.
5. Once removed, tested by connecting directly to battery.
a. First with ground (B -) on the case, big (B+) on the screw terminal as per car connection, and (B+) touched to solenoid signal input. No reaction whatsoever, apart from few sparks.
b. Second with ground still on the case, and big (B+) on the other side of solenoid where it goes into the motor case. No reaction again.
This led me to conclusion that it is burnet.
I took the starter apart and indeed it turned to be very much burnt...
Got the new one fitted.
Turned...
Kind of blow back noise - not started...
Checked compression as a next step, results are:
Dry
Cylinder 1 = 200psi
Cylinder 2 = 190psi
Cylinder 3 = 98psi
Cylinder 4 = 110psi
Question was top or bottom end. Thus I performed wet compression test, compression improved massively. Thus the conclusion is that piston rings or scoring on the cylinders. Bottom end anyway.
I hope this will help someone with similar symptoms.
I am willing to rebuild it... I need to decide on what parts...
Standard or forged???
1. Complete standard with new pistons, rings, bottom end etc...
2. Forged pistons, rods, race bottom end etc...
As I mentioned in my welcome post, here it is... description of the non starting tfsi bwa on a3.
I got it with following symptoms:
- key in
- ignition on (position II)
- big fat NOTHING, not even a light dim...
1. I started diagnostics with relays and fuses. All been good.
2. Next step was to disconnect signal cable to starter solenoid.
3. Tested for 12V when key turned to start(position III) - result was ok. 12V available.
4. Next step; starter removal.
5. Once removed, tested by connecting directly to battery.
a. First with ground (B -) on the case, big (B+) on the screw terminal as per car connection, and (B+) touched to solenoid signal input. No reaction whatsoever, apart from few sparks.
b. Second with ground still on the case, and big (B+) on the other side of solenoid where it goes into the motor case. No reaction again.
This led me to conclusion that it is burnet.
I took the starter apart and indeed it turned to be very much burnt...
Got the new one fitted.
Turned...
Kind of blow back noise - not started...
Checked compression as a next step, results are:
Dry
Cylinder 1 = 200psi
Cylinder 2 = 190psi
Cylinder 3 = 98psi
Cylinder 4 = 110psi
Question was top or bottom end. Thus I performed wet compression test, compression improved massively. Thus the conclusion is that piston rings or scoring on the cylinders. Bottom end anyway.
I hope this will help someone with similar symptoms.
I am willing to rebuild it... I need to decide on what parts...
Standard or forged???
1. Complete standard with new pistons, rings, bottom end etc...
2. Forged pistons, rods, race bottom end etc...
