OM606.962 Valve Float @ raised boost?
OM606.962 Valve Float @ raised boost?
After reading your thread about your fuel delivery system i am pretty sure i know whats causing the problem.
First: the original lift pump is garbage. The pressure output oscilates and has quite high peak pressures which causes oscilating engine sound on idle.
Second: I had only bad experiences with a check valve on the suction side. It can cause steaming an bubbling inside the lines when the flow is high. And thats exactly what I am thinking is happining to you. When your lift pump pumps more and more fuel, the fuel starts to "boil" inside the suction lines which causes gas inside the lines. This gas causes retarded timing and less fuel being injected.
This problems were happining in low gears, i think due to the higher acceleration the ball inside the valve wanted to close the valve.
After i threw out the check valve and upgraded to a 044 bosch pump, my issues were gone.
Edit:
Here is a video, the sound on the end of first gear:
https://youtu.be/0ElqlNd6ios
I think i had a similar problem like you.
After reading your thread about your fuel delivery system i am pretty sure i know whats causing the problem.
First: the original lift pump is garbage. The pressure output oscilates and has quite high peak pressures which causes oscilating engine sound on idle.
Second: I had only bad experiences with a check valve on the suction side. It can cause steaming an bubbling inside the lines when the flow is high. And thats exactly what I am thinking is happining to you. When your lift pump pumps more and more fuel, the fuel starts to "boil" inside the suction lines which causes gas inside the lines. This gas causes retarded timing and less fuel being injected.
This problems were happining in low gears, i think due to the higher acceleration the ball inside the valve wanted to close the valve.
After i threw out the check valve and upgraded to a 044 bosch pump, my issues were gone.
Edit:
Here is a video, the sound on the end of first gear:
https://youtu.be/0ElqlNd6ios
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