What causes a Jeep Grand Cherokee to run rich?
This will cause the Grand Cherokee to run rich. Jeep Grand Cherokee O2 Sensor Mass Air Flow Sensor – The mass air flow sensor calculates the volume of air entering the engine. If it has gone bad, the air fuel mixture will be off and the P0172 code will show.
Why does my Jeep Grand Cherokee smell bad?
Exhaust Smell/Color – Depending on how rich the motor is running, there could be some exhaust odor or discoloration. Fouled Spark Plugs – The spark plugs can foul if the engine runs very rich for a long enough period of time. This youtube video is a great resource for diagnosing the P0172 trouble code in your Grand Cherokee.
Why is my Jeep running rough after warm up?
Rough Idle and Running After Warm Up. Rough idle and running after warm up. I’ve got a Jeep Grand Cherokee 4.7 v8 that has suddenly developed a problem that makes the Jeep idle rough and run bad like it is missing or starved of fuel or something.
What causes a Jeep Grand Cherokee to misfire?
Misfire – If the air fuel mixture has gotten too far from factory specs, this can cause the Grand Cherokee to misfire. Idle Issues – With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.
This will cause the Grand Cherokee to run rich. Jeep Grand Cherokee O2 Sensor Mass Air Flow Sensor – The mass air flow sensor calculates the volume of air entering the engine. If it has gone bad, the air fuel mixture will be off and the P0172 code will show.
Misfire – If the air fuel mixture has gotten too far from factory specs, this can cause the Grand Cherokee to misfire. Idle Issues – With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.
Exhaust Smell/Color – Depending on how rich the motor is running, there could be some exhaust odor or discoloration. Fouled Spark Plugs – The spark plugs can foul if the engine runs very rich for a long enough period of time. This youtube video is a great resource for diagnosing the P0172 trouble code in your Grand Cherokee.
What kind of fuel trim is running rich?
Okay, next issue… my car is running a little bit rich. Scanning it and reading about -8% LT when idling. When at around 25% throttle and 50kpa MAP LT fuel trim is just -1%. Pressing the throttle a little bit more and at higher MAP I get -4% to -8%. Values are not that much off so the check engine lights is not on and no DTC thrown.