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Old 08-27-2010, 01:07 PM   #1
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knock-knock

Bought new 2010 Jeep Wrangler. Went 4 wheeling-hello hot oil light-learned from this forum to use 4-low next time. That's good. Informative. Real question is fuel knock. I use low grade octane. Thought on board computer would recognize issue and adjust spark detonation. There was no CEL. Computer glitch needs update? Talk to me.

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Old 08-27-2010, 01:59 PM   #2
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The JK is designed to run on 87 octane I believe.

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Old 08-27-2010, 02:05 PM   #3
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I agree. 87 octane. I have no problems with knocking.
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Old 08-27-2010, 05:23 PM   #4
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The hot oil issue can be resolved with a $50.00 B&N trans cooler, easy to
install.
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Old 08-27-2010, 05:33 PM   #5
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Bad gas.. That's what is making it knock.
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Old 08-27-2010, 08:26 PM   #6
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Yea I don't think the 4 hi or lo is the problem! I went for 3 hours using 4 hi and lo with out any problems at all! And can someone explain this trans cooler a little to me! Is it hard to install and how much improvement do I get
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Old 08-27-2010, 08:38 PM   #7
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I used to get knocks... It's the sediment build up at the gas station being pumped into your vehicle that causes it.
times to not be at station: when pump truck is there and when the pumps are almost empty.
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Old 08-27-2010, 10:00 PM   #8
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The trans cooler cools your transmission fluid. I had the same problem you had the first time I sent 4x4 in deep sand on the beach. With out the cooler you will over heat your transmission and could destroy it costing thousands to fix. The cooler cost $50 and installs in less then two hours. I' m not a mechanic and was able to install one without a problem.
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Old 08-27-2010, 11:16 PM   #9
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For my wife"s 2010 Jeep Wrangler. 87 Octane. Sounds good. Trans cooler. Seems good. 4 hi vs 4 low. Will test. Bad gas. Go figure. Missing my old 86 Jeep Wrangler. You bet!
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Old 09-09-2010, 04:01 PM   #10
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Not all fuels are the same, with the bigger name brands, you tend to get more and or better detergents to keep deposits away. Fuel stations with low volume and those taking a fuel delivery or low fuel reserves have the potential for water contamination and sediments. As far as the "gas" is concerned, it's usually a blend from several refineries, conforming to an API specification. Ethanol fuels have the tendency to reduce fuel efficiency and contain trace amounts of water from condensation. The octane or "knock" number is determined by the RON+MON/2 method and is an industry/API standard. The RVP in market fuels changes with the seasons and is sometimes noticeable. Long story short, avoid ethanol and low detergent fuels.
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Old 09-09-2010, 04:40 PM   #11
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If you've got an automatic transmission, and it's hot out, and you're going uphill, turn off the A/C and downshift to the lowest gear you can run without revving too high. This will help avoid overheating the tranny oil.

However if you do overheat, pull over, pop the hood open and let it idle. Turn ON the A/C. I know that sounds counter-intuitive, but it will force the fan to crank up higher and blow the heat out faster (while idling with the hood popped open). Wait until the hot oil light turns off before rolling again.

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