Join Date: Dec 2001
Location: Antelope Valley, CA
The mixture doesn't lean out; there is no mixture. When an injection event is cut, there is simply no fuel for that cylinder to burn. OEMs use it almost exclusively, if not exclusively, even with turbo engines, because it doesn't have the same potential for damaging parts that spark-only rev limiting does. Throwing fuel and air into the exhaust sets up the potential for melted cat converters (if you have them) and/or lighting off ahead of the turbo, which will put tremendous thermal stress on both it and the piping. Great for boost, bad for parts.
There is the issue of wall wetting and fuel cut will cause the ports to dry out, which has bearing on how the engine responds when fuel comes back. I am not sure how the EEC-IV strategy handles that.
1968 Mustang notchback-H/C/I/E/etc.
1972 Pinto Runabout-2.3T/T5/MS-II.
Last edited by GT Madness; 06-26-2013 at 01:48 PM.