I finally got my Jeep to cut the injectors off yesterday, driving home I engine braked by first taking it out of OD, and then down to 2nd gear. This popped the RPM up to about 2800, and the injectors cut off until RPM was down to around 2300-2400, at which point I popped it into first which sent the RPM up to 3400, once the injectors cut off this time the RPM instantly dropped to around 2800-2900 (since the TC wasn't locked any more) and the injectors cut on around 2300-2400 as before. This is the first time I've gotten the Injectors to cut off, and while it's good to know that they do, the High RPM needed makes it basically useless for everyday driving. Luckily, I have a kill switch rigged up to the injectors to allow me to kill them as needed for engine braking.
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