Quote:
Originally Posted by roflwaffle
Try it w/o the spacers first. I have a feeling putting spacers to close off the intake port will simulate the highest pumping losses you could see for those cylinders (throttle is not open). Just disconnect the FIs for whatever cylinders and see if there is any improvement. Make sure you can keep test conditions as consistent as possible. For instance if your Dakota stays in third w/ the TCC unlocked after the FIs are disconnected during a highway run, when you're doing the run w/ the FIs connected do it in third w/ the TCC unlocked.
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Just disconnecting the four FIs will not work as the oxygen sensor will pick up on a lean AFR and the engine management will try to adjust by adding extra fuel.