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umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 642
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weird,
My first thought was maybe Decel Fuel Cut triggered by the MAPdot, however
RPM - MAP and VE - DPR mA all seem smooth, so it doesn't appear to be a control issue
If I remember correctly over fuelling or an incomplete burn can cause a lean response from the wideband sensor as there is excess oxygen left in the exhaust, therefore it may not be truly lean at those points,
can you feel the engine lose and gain power between those jumps?
__________________
Steve
1981 928S 4.7 ROW with KE3-Jetronic
"Be the man your dog thinks you are."
www.FrankenCIS.com
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