Question about 1994 Jeep Grand Cherokee

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Jeep Cherokee went from 18 MPG tp less Than 8 MPG over night.

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There are several items you can check there. Your temperature sender if bad can make the computer think the engine has not reached normal temp, causing the computer to add extra fuel, Your MAP sensor can do much the same thing as can the Throttle position sensor. I'd also check the fuel pressure regulator as default is to a higher pressure than normal.
Manifold air temp and O2 sensors can do that too, but normally not that drastic of a difference.
Testing can be done using a digital multi meter and a haynes or chilton manual as a guide. Begin by having a code scan done (most larger parts stores do that free). Also, make sure the fuel system and lines aren't leaking anywhere...that can use up lots of fuel as well.

Posted on Jul 30, 2010

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Posted on Jan 02, 2017

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