FamilieTrukvagen
New member
- Location
- usa
- Car(s)
- '15 Sportwagen
This is a partial repost from Vortex, in the hunt for advice. From the beginning:
MPG, both city and highway, were down by about 20% compared to peak post break-in with slightly rough idle. WOT, cruise, both fine throughout the rev range. Car is stock, lightly driven, lots of short trips, with about 40K on the clock. No codes on a generic reader. I started with the easy stuff: air filter, (dealer sourced) plugs (both of which looked fine). No improvement.
Borescope showed somewhat dirty valves. I tried a couple of cans of cleaner through the MAP port. Minimal improvement both in mpg and appearance on scope. Car was in for sunroof drain TSB and dealer also said no codes, and also blamed dirty valves, but wanted $1200 to clean. Had the media blasting done for much less by indie mech, but only partial improvement. I installed new coil packs (again, easy), but no difference.
Picked up OBD11. Live data shows missing on #3, perhaps 30 or so for a 30 minute ride and as much as 2/1000 revs. Still nothing on 1,2,4. No fault codes.
For one startup, had worse than usual idle, and via OBD11 immediately pulled intermittent codes P0201, P0202, P0203, P0204 (each cylinder injector circuit), plus databus U112300. Clear them, and it never happens again.
I swapped the coils and plugs between 3 and 4 and the miss stays at #3. While in there, I checked compression (regular, not leakdown) and it was fine and equal between cylinders. The borescope showed a little carbon on the pistons but no better/worse on #3.
I'm on tank #3 of cleaner (tried both Techron and Gumout total) and it got better and then slightly worse again (total 30 misses for a 30 minute trip down to 5 and today 30). Still no fault codes. I'm favoring a bad injector. There is no obvious harness damage on the coil side but of course I can't see the injector harness. Any thoughts would be helpful, particularly if there is another OBD11 live data reading I should be looking at for clues.
Thanks in advance.
MPG, both city and highway, were down by about 20% compared to peak post break-in with slightly rough idle. WOT, cruise, both fine throughout the rev range. Car is stock, lightly driven, lots of short trips, with about 40K on the clock. No codes on a generic reader. I started with the easy stuff: air filter, (dealer sourced) plugs (both of which looked fine). No improvement.
Borescope showed somewhat dirty valves. I tried a couple of cans of cleaner through the MAP port. Minimal improvement both in mpg and appearance on scope. Car was in for sunroof drain TSB and dealer also said no codes, and also blamed dirty valves, but wanted $1200 to clean. Had the media blasting done for much less by indie mech, but only partial improvement. I installed new coil packs (again, easy), but no difference.
Picked up OBD11. Live data shows missing on #3, perhaps 30 or so for a 30 minute ride and as much as 2/1000 revs. Still nothing on 1,2,4. No fault codes.
For one startup, had worse than usual idle, and via OBD11 immediately pulled intermittent codes P0201, P0202, P0203, P0204 (each cylinder injector circuit), plus databus U112300. Clear them, and it never happens again.
I swapped the coils and plugs between 3 and 4 and the miss stays at #3. While in there, I checked compression (regular, not leakdown) and it was fine and equal between cylinders. The borescope showed a little carbon on the pistons but no better/worse on #3.
I'm on tank #3 of cleaner (tried both Techron and Gumout total) and it got better and then slightly worse again (total 30 misses for a 30 minute trip down to 5 and today 30). Still no fault codes. I'm favoring a bad injector. There is no obvious harness damage on the coil side but of course I can't see the injector harness. Any thoughts would be helpful, particularly if there is another OBD11 live data reading I should be looking at for clues.
Thanks in advance.
