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Old 03-02-2016, 12:14 PM
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Engine braking?

Purchased a 2010 sport few weeks ago. Its my first wrangler. when driving it feels like it slows down to fast/ like its engine braking. I had the computer flashed for correct tire size and there was great improvement but still depending on speed when I take foot off gas it feels like there is not enough coast. Is this normal for a wrangler??

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Old 03-02-2016, 12:30 PM   #2
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I never noticed anything unusual regarding engine braking, verses other vehicles that I have owned on level ground.
But when driving in our mountain area's then yes, it does engine brake better when driving down hill. I believe that the 32's with the 4.10 ratio is the major reason for this. I have a auto, so mine is in high gear when coming down off of the mountain.

I don't know if you have a manual, or auto. What gear you are in when you experience this braking, will also make a difference. If you have a auto, then maybe your trans is down shifting to soon..don't know, just a thought.

It is possible, that you may have a brake caliper hanging up.
When driving at speeds lets say 40 mph, just shift into neutral and then see if it free wheels, or still feels like it is braking. This way you will know if you have a brake dragging.

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Old 03-02-2016, 01:02 PM   #3
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I've noticed the same with my Wrangler. It's not enough for me to think that there's anything wrong. Just a guess, but I'd say that a Wrangler has a good deal more driveline friction than your average vehicle, and this is going to drag its speed down faster than what would happen in a car that isn't pushing two live axles.
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Old 03-02-2016, 02:51 PM   #4
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The 2010 JK 42RLE auto trans. is a 4 speed. It sounds like what you're experiencing is normal, but it's a good idea to rule out your brakes possibly dragging like Old Dogger mentioned. If your axle ratio isn't the base 3.21 and you're running larger tires it can feel that way even more.
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Old 03-02-2016, 02:57 PM   #5
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Mine is a manual so I'm not familiar with Jeep automatics. My Tacoma will automatically downshift if I touch the brakes on a downgrade. Do the Wranglers do so too?

If you're used to driving a car you'll find that oversize off road tires have much more rolling resistance than typical car tires. That combined with brick like aerodynamics will make it harder to keep rolling.
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Old 03-02-2016, 02:59 PM   #6
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I have a '13 auto w/3.21s and it will slow down going down hill as well. There are times I actually accelerate going down hill, never really thought anything was wrong. Like Zaphod B said it's just alot of driveline friction.
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Old 03-02-2016, 05:36 PM   #7
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We have a rental JKU Sport S on the Big Island right now, heading down Waipio Valley Road tomorrow and I just posted something about this very topic in the WF Hawaii forum. Was thinking about engaging HDC but one of the locals told me it's not necessary even though the grade is up to 45% in some areas. Gonna just slap her into 4lo and pray!
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Old 03-02-2016, 05:49 PM   #8
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Originally Posted by Old Dogger View Post
I never noticed anything unusual regarding engine braking, verses other vehicles that I have owned on level ground.
But when driving in our mountain area's then yes, it does engine brake better when driving down hill. I believe that the 32's with the 4.10 ratio is the major reason for this. I have a auto, so mine is in high gear when coming down off of the mountain.

I don't know if you have a manual, or auto. What gear you are in when you experience this braking, will also make a difference. If you have a auto, then maybe your trans is down shifting to soon..don't know, just a thought.

It is possible, that you may have a brake caliper hanging up.
When driving at speeds lets say 40 mph, just shift into neutral and then see if it free wheels, or still feels like it is braking. This way you will know if you have a brake dragging.

What he said. I'll add if you have 4.10 gears and came from a vehicle with highway gears you'll notice the engine braking when you take your foot off the gas. My Rubicon has 4.10 gears my Liberty has 3.73, my E-150 3.55 with a stick. When I back off the gas in the Rubicon there's a big difference compared to the Liberty, and the E-150. Both Jeeps have automatic transmissions.
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Old 03-02-2016, 08:36 PM
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thanks thought it might have something to do with being 4 speed auto !
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Old 03-02-2016, 09:15 PM   #10
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Lots of aerodynamic drag as well.
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Old 03-03-2016, 04:13 AM   #11
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Lots of aerodynamic drag as well.
Yea that too. They have the aerodynamics of a cinder block.
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Old 03-03-2016, 04:22 AM   #12
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The lower your gears are the more leverage the engine has in both acceleration and deceleration.
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Old 03-03-2016, 04:55 AM   #13
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I never noticed is until i broke a speed sensor. I believe what you feel is a program to save fuel when not accelerating. Try it, unclip a wheel speed sensor or wire in a ESP kill switch.

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