3.6 lack of acceleration from 4000 rpm - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

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Old 29-10-2017
SnakeDoctor  SnakeDoctor is offline
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Default 3.6 lack of acceleration from 4000 rpm

Hey guys,

3.6 JKU Auto 2014

Not sure if I got a dud batch of fuel or similar, would appreciate any notes or similar experiences people have had?

Whats happening:

Approx 20 minutes after getting a tank of fuel (Caltex 98, I normally put e10 in) I noticed a reasonable lack of go in general, figured it was just because it was a hot day, went to overtake on the highway and as soon as the RPM needle hits just past 4k it feels like it's hitting a rev limiter except without the cool noise.

After doing some testing besides a wall which reflects noise i'm reasonably certain the car is pulling fuel or spark at that point.

I couldn't hear any knock sound from the engine.

No fault codes logged or MIL/CEL, the lack in accel is pretty consistently based on RPM even under higher load (say 1st vs 3rd) so I don't think it's airflow related / choking.

Air filter passes the eye ball test, no other obvious restrictions in the air inlet.

I ran this tank down to 1/4 then filled it back up with my locals high turnover e10 and went for a quick 10 minute drive, no change in behaviour but no idea how much fuel is in the lines in these things.

Anything i'm missing?
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Old 29-10-2017
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Wouldn't be the first time a station has had a dodgy batch of fuel....if running a tankfull of different gas through it does nothing, try an overdose of EFI cleaner in a fresh tank....if nothing else, you may need to think about replacing the fuel filter...although you'd think that would throw a code?
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Old 29-10-2017
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Fuel filter x2
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Old 30-10-2017
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Does the 2014 3.6 have a separate filter, or just the ones in the tank on the pickup, like the older 3.8?
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Old 30-10-2017
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Could be a partially blocked cat converter in the exhaust where a piece of ceramic has broken off and blocking the outlet. Had a similar problem in my boy's XJ.
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Old 30-10-2017
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^^^
That and fuel filter x3

http://www.ausjeepoffroad.com/forum/...d.php?t=144153

Maybe, maybe not the scenario I had myself
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Old 30-10-2017
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Just as a suggestion, does yours have the insulation on the underside of the bonnet? In my '14 it came loose and partially blocked the intake. Same deal, seemed to hit a wall when accelerating.

However in my case it did throw a code, so it probably isnt likely, but thought it might be worth mentioning.

I cleared the code, and chucked the insulation and all good [emoji4]

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