Long post. Any advice will be much appreciated.
My DC5 has not been performing for a long time as it should. Full bolt ons and a Kpro with tune.
For the first year after the tune the car ran great. Then things slowly went donwhill.
Some days the car runs fine and other days it runs with all the mentioned problems.
Symptoms - Completely bogging out if given anything over 30% throttle under 2-3k and sometimes hitting lean cut
- When coming off gas into neutral and coasting, the idle bounces up and down
- Sometimes when sitting at idle the revs drop randomly and bounce back up. You can hear the hiss from the intake disappear momentarily and sometimes my USB input disconnects at the same time
- Jerking and stuttering at low revs in first gear
- On cold start up, my exhaust sounds very lumpy and almost like it is miss but with no codes coming up. My readout shows me that Im locked at 10.7:1 for about 5 seconds and then the idle slowly goes up as my ratio leans out before dropping back down again as the engine warms up
- When I take off, right as I'm depressing the clutch pedal, my revs drop by a noticeable amount
- The car shudders when I turn it off
- If I stall, the car will not restart straight away. It turns over but will not start or it will start and idle at about 200 rpm
- Lack of power throughout the rev band
- Last but not least, I get an intermittent code on startup every few days for P0452. EVAP Sensor Low Input
These are the things I've tested/replaced and believe not to be the problem - TPS, MAP sensor, IACV, Spark Plugs, Injectors, Ignition Coils, Fuel Pump, Fuel filter, Fuel Pressure Regulator, Vacuum Leaks, O2 Sensors, Fuel Cap. I have monitored my Hondata app and I appear to be maintaining 14.1-3 volts from my battery at all time. My Primary O2 sensor is showing around 2.5ish volts at idle and increases/decreases with revs
I have compression tested the car. It showed even compression across all 4 cyclinders within factory specs. The car does not use water or blow smoke. It does use oil
I have also tried using different base map tunes through Kmanager and these problems still persist so it is not tuning related
One last strange point I have is that on the days where the car runs fine, the throttle pedal has a very firm feel to it. On days where it is running poorly, it feels much softer. I can only attribute this to something related to vaccum within the intake manifold.
Im slowly going insane trying to figure this out. Thanks in advance for any ideas/advice that could help
My DC5 has not been performing for a long time as it should. Full bolt ons and a Kpro with tune.
For the first year after the tune the car ran great. Then things slowly went donwhill.
Some days the car runs fine and other days it runs with all the mentioned problems.
Symptoms - Completely bogging out if given anything over 30% throttle under 2-3k and sometimes hitting lean cut
- When coming off gas into neutral and coasting, the idle bounces up and down
- Sometimes when sitting at idle the revs drop randomly and bounce back up. You can hear the hiss from the intake disappear momentarily and sometimes my USB input disconnects at the same time
- Jerking and stuttering at low revs in first gear
- On cold start up, my exhaust sounds very lumpy and almost like it is miss but with no codes coming up. My readout shows me that Im locked at 10.7:1 for about 5 seconds and then the idle slowly goes up as my ratio leans out before dropping back down again as the engine warms up
- When I take off, right as I'm depressing the clutch pedal, my revs drop by a noticeable amount
- The car shudders when I turn it off
- If I stall, the car will not restart straight away. It turns over but will not start or it will start and idle at about 200 rpm
- Lack of power throughout the rev band
- Last but not least, I get an intermittent code on startup every few days for P0452. EVAP Sensor Low Input
These are the things I've tested/replaced and believe not to be the problem - TPS, MAP sensor, IACV, Spark Plugs, Injectors, Ignition Coils, Fuel Pump, Fuel filter, Fuel Pressure Regulator, Vacuum Leaks, O2 Sensors, Fuel Cap. I have monitored my Hondata app and I appear to be maintaining 14.1-3 volts from my battery at all time. My Primary O2 sensor is showing around 2.5ish volts at idle and increases/decreases with revs
I have compression tested the car. It showed even compression across all 4 cyclinders within factory specs. The car does not use water or blow smoke. It does use oil
I have also tried using different base map tunes through Kmanager and these problems still persist so it is not tuning related
One last strange point I have is that on the days where the car runs fine, the throttle pedal has a very firm feel to it. On days where it is running poorly, it feels much softer. I can only attribute this to something related to vaccum within the intake manifold.
Im slowly going insane trying to figure this out. Thanks in advance for any ideas/advice that could help
