[Diy_efi] Lumpy engine in closed loop cruise

[Mike]

Bit of a heavy load for cruise,

And yes does sound a bit lean, can you richen it up by
20% and observe the effect ?

Rgds

Mike


At 11:35 PM 10/20/05, you wrote:


>I have 4-cylinder Lotus Esprit Turbo. ECU is a GM 1228708  using a speed density system.
>
>In 5th gear,  trying to hold steady 85 mph,  3500 rpm, MAP about 100-130 kPa,  ECU is in closed loop.  O2 cycling between 0-0.65 V.  The engine is lumpy, like a slight hesitation. It feels like a very slight misfire,  press the throttle and it goes away as it richen up the mixture and accelerates  under power perfectly. The target A/F ratio in cruise is 14.7. 
>
>Are there any obvious causes of this,  over lean ?  etc...
>
>
>Dermot
>
>
>
>
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Regards from


Mike
Perth, Western Australia
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