Hey guys I have a customer with a 97 jeep wrangler 165k miles 2.5 it will start bucking and is using more gas than usual. setting a lean code I have replaced injector o rings as they were source of vacuum leak. also replaced tps and map sensor will run fine until hit open road and starts acting up and engine light comes on always a lean code. I cannot find any vacuum leaks
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My used 97 jeep wrangler fuel / economy problems: My vacuum canister was completely full with crud (replace). also my coolant temp sensor was bad (twice replaced), effects fuel mixture. and O2 sensors were bad (effect fuel mixture) due to being fouled by spraying too much oil on spector air filter (now wipe off excess and let dry in sun), also carb cleaner appeared to foul O2 sensors (stopped using). Also sensor input/output signals were constantly being interrupted by battery sliding into computer harness, which I cured by placing a 1" spacer on rear battery clamp to push battery away from computer. After curing these problems my fuel economy went from 55-60 miles per 1/4 tank to 75-80+ miles per 1/4 tank.
I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)
Try replacing Co2 sensor, most people don't realized that unit need replacing every 50-75k miles also. if that does not work, take it to the dealer and have them plug it into the computer, that will allow for them to narrow it down. with service engine light on, it will effect some of your gas mileage and the performances. The dealer charge somewhere around 50 bucks to diagnose using their computer, however 50 bucks will appilied toward the repair bill if they do the work.
Fuel flow. Either simply, a blocked fuel line (debris / filter / fouled gas) or an electronic issue. Ever let this Jeep run bone dry on gas? Hopefully not, as doing so can draw a lot of crud into your fuel lines from the bottom of the tank. Electronically, if part of the Jeep "brain" has gone bad, there may not be any fuel being routed to the engine. This most likely needs a Jeep mechanic to repair.
how long has this been happing..one tank of fuel or more, could have been bad gas, replace filter,, put gas dryier in fuel tank..if it continues could possibly be transmission related..the reving down doesn't sound like transmission though if tansmission was slipping it would rev up..good luck
Most gauges are set up this way to give you a bit of "margin" between "e" and stuck on the road.Sometimes this is set a bit too high but adjusting it is not worth the $. Additionally, there is generally about a gallon of fuel remaining in tank that the pump cannot reach. This protects you against most heavy debris (rust etc) and water that acumulates there (even in the most well maintained vehicles) which would otherwise easily enter the fuel system. As long as you are not running out at 1/4 tank or anything, you are OK.