Question about 1997 Jeep Wrangler

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Bad fuel millege

I have a 1997 4.0 wrangler I have earler in the year put on a cold air intake which i clean regularly, performance ignition kit , alll new exhaust, along with a new TPS wich did make a big difference because i got at least 270 miles to a tank wich is not bad for the way i drive, but now with colder weather here i am only getting 180 miles to a Full tank and every once in a while the Check engine light will come on too. i noticed a big dent on the bottom of my fuel tank "from a rock i must of hit" would this over time cause a problem? My fuel gauges a little off but I was still getting good fuel milege at the time, now i dont know .My geuss is that is is a bad sensor. but not assuming anything. please help me on a solution.

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I would replace the thermostat. in the winter the system will stay rich until it is approx 195 degrees. if you put a 160 degree thermostat in for a power boost. it dont work in the winter. also rich means lots of gas lean is a little gas . good luck

Posted on Nov 23, 2008

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====
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