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Jerking/bucking in low gear/low speed


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Hello Gents again,

New day, new question if you don't mind.

https://1drv.ms/u/s!Ale4oyMCOgLThMpH8YTIGkT_LGav7A?e=DrnJvb

In the log above I marked a section towards the end of the log where I was coasting in 2nd gear and above idle. The car was horribly jerking/bucking which you can clearly see from the oscillation of many logged parameters.

Do you have any idea/suggestion on how to resolve this?

Thanks,

Béla

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I suspect it is the fuel table needs flattening in that area, the logged fuel table value in that area is bouncing between 47-70%.  Since the exhaust gas is moving through the system so slowly at low engine speeds you cant see the rich/lean cycling on the lambda.

k7QODWE.png

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On 7/14/2020 at 7:45 AM, Adamw said:

I suspect it is the fuel table needs flattening in that area, the logged fuel table value in that area is bouncing between 47-70%.  Since the exhaust gas is moving through the system so slowly at low engine speeds you cant see the rich/lean cycling on the lambda.

k7QODWE.png

Thanks Adam.

I gave it a try, and I can tell you it is better then before, but it needs a little more work. Hopefully I can make it smooth soon.

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