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When does it jerk , all speeds or under a steady load ? going up a hill ? Would you consider it a misfire ? do you know what a misfire feels like ? Do you have a check engine light on or flashing ? Does your vehicle have coil on plug ignition ?
First take it to autozone and see if there is no codes..They do it for free...If there is no codes and there is not a p1000 then your good.. You have to do a drive cycle ..Kinda hard to do without a scanner,,but let it set overnight..The fuel level has to be between 3/4 to 1/4 no more no less..Let the vehicle warm up Go out on the road and drive about 40mph real steady ..Try not to accelerate after about 10 mins of steady driving ,,then drive about 50 to 60 for about 5 mins and then stop and idle for about 5 mins..At this time ,,dont turn the car off or you have to start over..Only way to know if the system passed is to have the system scanned..If your trying to get the emmision done,
The estimated mileage is determined under optimum conditions. You are close. I would just drive it.. You are 92-93 % of estimated of estimated fuel usage.The sticker ad is estimated mpg.. the estimated usage is under CAFE rules.
brake hose could be bad or this is normal for engine to brake vehicle all autos do this it is called engine braking it is normal. if your brakes are wearing uneven then i would suggest a brake hose on the passenger side.
Did this happen overnight or was it a gradual loss? Did you do any kind
of repair before you lost the gas mialage? Is there a check engine
light on or did it come on and go off? Did anything weird happen before
the jeep got bad gas mileage? It's hard to diagnose a problem like this
without actually touching the car.
Any other info might help me steer you in the right direction.
when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.
There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.
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