MPG cut in half !!!

My guess would be if you have the stock intake, No secondary throttle plate changes and the OEM valve overlap your now not getting a efficient burn. especially if your not in the map area that uses the narrow band O2 sensor or if there is a limit on how much the ecu will adapt the fuel trim. Just guess though.
 
My guess would be if you have the stock intake, No secondary throttle plate changes and the OEM valve overlap your now not getting a efficient burn. especially if your not in the map area that uses the narrow band O2 sensor or if there is a limit on how much the ecu will adapt the fuel trim. Just guess though.
Ok thankyou that's pretty helpful because I'm new to all these sensors and high teck computers
 
are you sure you have all the connectors hooked up? might want to check.
the more you twist the less mileage you get.
 
you have two throttle position switches connectors. also you have a (map) manifold pressure sensor that have 3 vacuum tubes that go to the intake. my best guess that one of these is either off or has a crack in them.
a good mechanic with a GOOD scanner could probably tell you whats going on.
you have an OBDII connector ,i think it is to the left side of batt . if i was working on it i would pull codes if any,then check tps readings,then map readings eng off then eng running.
if the map is out of range the comp substitutes a value which is richer than normal.
herman
 
you have an OBDII connector ,i think it is to the left side of batt .
It's not OBD-II. It's the same connector but the error codes are NOT OBD-II. It's closer to OBD-I - a much smaller set of "open" codes. very little useful data ime. TuneECU covers most error codes.
 
Is it running ruff or does it run normal? Also is the engine light on and did you do anything up top with the filter system? Is the engine light on?
 
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