Quote:
Originally Posted by bee_are_zee
I am having some very strange issue with my LTFT at idle. A little background, I am running a vortech supercharger with an OFT tune, 9psi pulley, stock injectors. When I first turn the car on it is in injector mode 1 (port only) and the fuel trims will climb until maxed out at 39.4%. If i blip the throttle a few times the idle will switch to mode 2 (DI only) and will idle fine. normal driving conditions seem to be fine as well. Any thoughts as to what could be causing this?
I have already checked for vacuum leaks or any exhaust gasket leaks.
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This sounds like a fuel pressure problem or a bad Injector.
If you do not have the correct fuel pressure it will cause a rich or lean condition. Example low fuel pump output would cause a low pressure not allowing the injector to spray the given volume per pulse. Over pressurized would make a rich condition. Stock pressure should be around 54psi.
A clogged injector will run lean as a stuck open injector will drop raw fuel on the piston causing a rich condition.
Don't rule out the ignition side either. Try pulling the plugs and look for a fouled plug. (black and wet) or look for a bright white which would be lean..