View Single Post
Reanimotion Reanimotion is offline
umop apisdn
Join Date: Jun 2014
Location: Brisbane, Australia
Posts: 501
logging during several cold starts should provide some clues as to the variables that might be in play

it's all going to be about balancing the transition from off to cranking to running

accumulator pressure - fuel pump turn on - cold start injector status - FV and CP ratios all need to be tweaked to ensure the system has and maintains fuel pressure and subsequent delivery during the startup

for example, until the engine turns faster than the "crank speed" setting, the system is essentially in fuel cut mode and the majority of fuel delivered will be from the cold start injector only. And the thermo time switch on the cold start circuit limits delivery to 8 seconds or so of total cranking.

warm start seems ok from the log but cold might be turning a little slower and not kicking over the set point
lowering the cranking speed setting from 300 to maybe 150 or less will bring the CP and FV control in earlier
1981 928S 4.7 ROW with KE3-Jetronic and Franken8 (AEM Inifinty) follow at []
Yes! mechanical/hydraulic constant flow injection can be managed by a modern EMS
Old 01-26-2017, 06:21 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #742 (permalink)