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Reanimotion Reanimotion is offline
umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 543
it's hard to tell the actual numbers in the screen shot, but DPR mA may already be at max at that point so cannot go any higher.

There are multiple things that can affect any engine under load, especially a boosted one, ignition breakdown under boost could be a factor, or alternator/battery voltage fluctuations from a slipping belt causing the fuel pump or it's relay to drop out momentarily

It may even be an issue with the wideband controller, a loose ground that shifts under acceleration messing with the signal

have a good look at the logs from the MicroSquirt and see if you can find anything else that changes at the same time the AFR rises, also go hunting for loose wiring or things that can move about and mess with grounds and power supply to the electrics.

Some time on a dyno with an independent AFR measurement to confirm you readings is also a very good idea.

The KE3 fuel heads have an 8mm test port on the lower half you could plumb a pressure sensor into to verify if the control pressure and fuel supply is stable during the lean events.
1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) "Be the man your dog thinks you are."
Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS
Old 09-24-2018, 12:35 AM
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