I wonder if that evap leak is a leaking purge valve, spilling fuel vapor into the intake causing your rich condition. I guess I don't understand the high pressure fuel pump action. Isn't fuel trim adjusted by the time the injectors are on? Or, do vehicles with a high pressure pump react differently to adjust fuel trim?
The problem we had with the high pressure fuel pump was caused by a failing pressure control valve in the pump sticking on. When these purge valves leak they will cause rich conditions but usually only with a freshly filled fuel tank. Otherwise they cause a lean condition, sucking air out of the tank past the open vent control valve.
two thing 1. wish yo would have pulled up the fuel pressure regulator command. Watch the command from the computer during the decel to see if the computer is actually trying to bring the fuel rail pressure down.(not sure if this GDI system used a regulator that when the solenoid is turned up causes the pressure to rise or if it causes it to lower when the solenoid is turned on) If the command is there make sure it actually happening with a scope while driving. 2. Disconnect the PCV system while the car is in the bay and plug the lines up to prevent a vacuum leak and see what the fuel trims would do. If they go normal the pump is leaking into the crank case. Just another way to confirm your diagnosis.
At 8:00 excellent explanation.
Very clearly explained.! Thanks again..!
Thanks!
I wonder if that evap leak is a leaking purge valve, spilling fuel vapor into the intake causing your rich condition. I guess I don't understand the high pressure fuel pump action. Isn't fuel trim adjusted by the time the injectors are on? Or, do vehicles with a high pressure pump react differently to adjust fuel trim?
The problem we had with the high pressure fuel pump was caused by a failing pressure control valve in the pump sticking on. When these purge valves leak they will cause rich conditions but usually only with a freshly filled fuel tank. Otherwise they cause a lean condition, sucking air out of the tank past the open vent control valve.
Did that system have a pump trim pid?
Not sure, if I get another similar vehicle in it I will check.
@@fixingcarswith15thstautomo36 Thank you for the reply.
two thing
1. wish yo would have pulled up the fuel pressure regulator command. Watch the command from the computer during the decel to see if the computer is actually trying to bring the fuel rail pressure down.(not sure if this GDI system used a regulator that when the solenoid is turned up causes the pressure to rise or if it causes it to lower when the solenoid is turned on) If the command is there make sure it actually happening with a scope while driving.
2. Disconnect the PCV system while the car is in the bay and plug the lines up to prevent a vacuum leak and see what the fuel trims would do. If they go normal the pump is leaking into the crank case. Just another way to confirm your diagnosis.
Next time
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Just subscribe good knowledge
Thanks!