TheKeymeister
Active Member
- Posts
- 772
- Location
- Lincolnshire
Well this morning I replaced the low pressure fuel pump and took it for a run, no different...
I then replaced the final intercooler hose and took it for a run, no different again...
Vent pipe and filter are definitely clear
Vacuum definitely available, it improves (i.e. only happens at higher rpm) when the vacuum is disconnected and the turbo is on minimum boost
I have pulled and pushed the actuator when I changed the boost solenoid and it was reasonably free. I will get someone to rev it and make sure its moving though. I imagine it is at least partially operating though with it improving when there's no vacuum connected.
I think my next move will have to be to try and get it code read with something better and try and see some more live data. It doesn't make sense that it's cutting the fuelling for overboost at only 120kPa MAP, there must be more to it than that
Also, I forgot to add, I have had a long running slight misfire at 2000rpm, especially in neutral, it causes juddering and white/blue smoke out of the back. Could be totally unrelated as it's not bothered it since I've had it, and I've put at least 5k miles on it like that.
Thinking out loud, could it be that at 120kPa MAP it increases fuelling, and the fuel rail sensor/wiring is dodgy and showing excess fuel pressure at that point, resulting in it cutting the LP fuel pump? Although I have checked and cleaned the plug I haven't proved the wiring back to the ECU. Unfortunately I can't see the live data for fuel pressures with the diagnostic kit I'm currently using, I either need to borrow the Hawkeye again (unfortunately that friend is 2 hours away) or involve a decent garage...
I then replaced the final intercooler hose and took it for a run, no different again...
Thanks for this, I tried it but they all made it throw a wobbly. Throwing some injector cleaner through probably can't hurt though
Vent pipe and filter are definitely clear
Vacuum definitely available, it improves (i.e. only happens at higher rpm) when the vacuum is disconnected and the turbo is on minimum boost
I have pulled and pushed the actuator when I changed the boost solenoid and it was reasonably free. I will get someone to rev it and make sure its moving though. I imagine it is at least partially operating though with it improving when there's no vacuum connected.
I think my next move will have to be to try and get it code read with something better and try and see some more live data. It doesn't make sense that it's cutting the fuelling for overboost at only 120kPa MAP, there must be more to it than that
Also, I forgot to add, I have had a long running slight misfire at 2000rpm, especially in neutral, it causes juddering and white/blue smoke out of the back. Could be totally unrelated as it's not bothered it since I've had it, and I've put at least 5k miles on it like that.
Thinking out loud, could it be that at 120kPa MAP it increases fuelling, and the fuel rail sensor/wiring is dodgy and showing excess fuel pressure at that point, resulting in it cutting the LP fuel pump? Although I have checked and cleaned the plug I haven't proved the wiring back to the ECU. Unfortunately I can't see the live data for fuel pressures with the diagnostic kit I'm currently using, I either need to borrow the Hawkeye again (unfortunately that friend is 2 hours away) or involve a decent garage...
