I always use 93 or 95 High octane gas. Thursday leaving the office for an appointment I put $10 bucks of 7-11 Citigo gas in tank. By Friday night car sounded like it was a mack truck.Loud Loud and Check Engine lights been flashing! Stopped at an Auto Zone-picked up Lucas cleaner and did a partial fill with Mobile high test gas.
side note --
When I took vehicle over to Lexus for 90,00 mile service I was informed the Check Engine light has to do with a sensor. Also that I have crack in my muffler.
Overall the vehicle runs good -the loudness of engine concerns me though. Do you recommend I replace the muffler?
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Re: Loud engine or Muffler
Hi. if the muffler is truly cracked, it will release a loud, unfiltered, noise during acceleration and idling as well. it will rattle as well. i recommend replacing the muffler ASAP.
Concerning the fill up at 7-11, there may have been a high water content that was in this gas stations tank and, this was transferredto your tank during the filling. the Lucas treatment will remove the water out of the tank andcorrect any damage that may haveoccurred,if any..
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The owners manual probably says no. Most say 89 octane is the lowest. Look in manual if you have one or they are typically on-line. With that said, test your vehicle with that fuel. Next time it is very close to empty put 2-3 gallons in the tank and drive. If the octane is too low the engine will "spark knock" or "diesel" (a rattling sound from the engine upon acceleration caused by fuel pre-ignition/detonation). If that happens put an equal amount of premium fuel in the tank and the spark knock will go away. Short-term a spark knock won't damage an engine, but longer term can by causing over heating, vibrations, abnormal stresses ... hesitation on acceleration - poor mileage and poor engine performance. If you are able to use 88 octane-15%, without getting a spark knock, make sure you check your mileage and see if, or how much, it drops. Lower octane and higher ethanol both reduce mileage. What I always told my gas customers was to check your mileage with different octanes and see what octane gives the highest mileage (and then do the math and see if its cost effective). Say you use regular normally and you get 30 MPG. Then you try the mid-grade and get 33 MPG, so you try premium fuel but you still get 33 MPG. In that case the mid-grade is your best option, assuming that your 10% increase in mileage cost you less than a 10% increase in cost! But you do always stay away from fuel that causes a spark knock.
The rule of thumb is: The higher the octane the cooler the combustion, therefore the lower the octane the hotter the combustion. Higher ethanol means that the engine is running a little leaner and a little hotter.
Low-octane "regular" gas is usually all that is required. Octane is only a rating of the fuel's resistance to engine-damaging pre-ignition ("knock") in high-performance engines (that few people have). Low octane gas is less expensive and a better value if that's all your engine requires. Best case scenario you're wasting money by filling up with a higher than recommended grade of gas. Worst case scenario that high octane fuel is building up damaging carbon deposits in your engine because it's not being burned as completely as lower octane fuel would be. Check your owner's manual to be sure. Modern high performance cars will sometimes recommend higher octane fuels because they are engineered to use those fuels. The use of lower than recommended octane will not make your car explode, the ECM (Engine Control Module, aka:computer) will adjust the fuel injectors and spark timing to save the engine and compensate for you cheaping out at the pump. Those adjustments will consist of retarding the spark (reducing power and efficiency) as well as dumping lots of extra fuel into the cylinders to cool them, potentially costing you more than getting mid grade or premium IF that's what your car requires.
NOTE: Remember that engines need less octane at higher altitudes. If your engine does not "knock" on regular, paying more for a higher octane rating is a waste since the increased octane makes no significant improvement to gas mileage and it is no better for your engine. All available fuels have detergent and additive packages.
This will help.good luck.
Octane ratings have nothing to do with fuel economy or power. The octane rating only indicates how much the fuel air mixture can be compressed before it ignites without the spark plug firing in a hot running engine. Some really high compression engines require higher octane fuels so they don't knock when running. If you don't have a sticker under the filler lid that says you have to use one of higher octane fuels, then don't use high-test.
It used to be that using a low octane fuel in an engine designed to use high octane fuels could damage the engine.
Nowadays, engines are all computer controlled and most high octane engines will re-tune themselves on the fly so that they don't knock if the wrong grade of fuel is used.
You can't put unleaded into a 1999 vehicle... you must have things confused. Some vehicles prefer high octane gasoline instead of regular. Using the wrong one (containing 10% ethanol can overheat and ruin the inside of some engines) Dual fuel engines can handle the ethanol.
There is no advantage in mixing fuels If the car is tuned to run on regular leave it at that as the computer has been set for that fuel. Check with a dealer and find the recommended fuel for your vehicle . By going to a speed shop that has the ability to reset you cpu to a higher/lower fuel rating you can retune the motor. But if you are running on the recommended fuel leave it alone. It will be cheaper in the long run
You should always use premium fuel on the high conmpression V8 engine. Cheaper fuel can cause a PING, and possible engine damage. 87 octane is definitely not recommended at any time, but sometimes you can get by with 89 for a small period of time.
Gas mileage and power will both be down with lower octane fuel, so do not use it all the time.
Even a small amount of bad gas can cause your problem.
So the first thing you need to do is remove your fuel tank so you can drain all of the old fuel out,then remove the fuel sending unit and fuel pump assembly thats in your fuel tank and clean the filter screen, after that you can reinstall the fuel tank,replace your fuel filter and I would have a fuel injector sevice done.
Unless you are very skilled in automotive repair, leave this one to a pro.
The 2005 Durango has a notorious issue with the exhaust manifold blowing out
it is a $10-$15 fix if you have someone to replace it.
when you first start it up it sounds loud like the HEMI but then it settles down, also the gas mileage and the power have been reduced as well. best bet is to buy the part and a chiltons manual. $15 bucks and a case of beer later you should be good to go. Midas muffler shop can confirm the exhaust leak as can any mechanic worth a **** and they SHOULD NOT CHARGE YOU!!!