[Diy_efi] Lumpy engine in closed loop cruise

[Dermot O'Hare]

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>It's hard on the turbo to hold boost for a long time like that.  FYI. 
>
>You shouldn't be in closed-loop at that high of a manifold pressure. 
>At the very least you are giving up power, and probably detonating. 
>
>If you didn't rechip that GM ECU, then my theory is you are 
>misfiring and sending unburned O2 down the exhaust and it's being 
>picked up by the O2 sensor and registered as a momentary lean spot 
>in an otherwise rich situation.  There's no way that GM ECU would 
>allow the engine to be lean at that high of a boost. 


Sorry, if I mislead you.   It is at almost no boost, very low load 
about .2-.3 bar above atmospheric.  130 kPa absolute.


Dermot
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