Above 45mph when I take my foot off the brake, it feels like engine braking - JeepForum.com

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post #1 of 25 Old 08-18-2013, 08:52 PM Thread Starter
RoldGold
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1996 ZJ 
 
Join Date: Jun 2013
Location: Philadelphia
Posts: 317
Above 45mph when I take my foot off the brake, it feels like engine braking

Maybe this has always happened, but in the past couple weeks I've noticed that when I take my foot off the gas and let the Jeep just coast, sometimes, and I mean only sometimes, I feel it quickly engine brake. I've noticed that the rpm's drop to 1000 right when I take my foot off, then jump up to 1300ish. Is it just the speed I'm going and I'm going to get engine braking in OD no matter what I do or is that an indication something is failing?

Thanks in advance!


1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #2 of 25 Old 08-18-2013, 08:58 PM
coltman151
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1995 ZJ 
 
Join Date: Apr 2012
Location: maryville
Posts: 213
just going off of your previous post about it not shifting good, check the trans fluid. if its not low, it sounds like you might be adding a new one in. lol

95 Laredo 4.0, 2" RE BB, RC N2.0 Shocks, Custom Roof-Mount Light Bar w/ 6 lights, Bumpers deleted, Homemade sway bar discos, Michelin LTX 31x10.50s, and a Dog Box :)
Planned: Homemade Spare tire carrier, double shear front track bar, 4 adjustable rear control arms, New Rims and 33" Wrangler MT/Rs or BFG M/T KO's w/ LOTS of trimming.
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post #3 of 25 Old 08-18-2013, 08:59 PM
eagsc7
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1994 ZJ 
 
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Location: Sweetwater Cyt
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Sounds like your O/D button has been pressed. If the light right above it is on, then the O/D is OFF, and "Engine Braking" is engaged.

My Build Thread: http://www.jeepforum.com/forum/f13/steaks-zj-build-repair-thread-1552698/
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post #4 of 25 Old 08-18-2013, 10:21 PM Thread Starter
RoldGold
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1996 ZJ 
 
Join Date: Jun 2013
Location: Philadelphia
Posts: 317
Gosh I sure hope I don't need a new trans. I'm only at 107k.

The O/D button wasn't pressed.

I want to stress that it is barely noticeable, and when noticeable, lasts only for a second before it goes away.

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #5 of 25 Old 08-18-2013, 10:25 PM
just_urd
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1998 ZJ 
 
Join Date: Feb 2013
Location: Whittier
Posts: 136
My jeep does that when the computer is "relearning" from having the battery disconnected... Usually goes away after 30 or so miles.
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post #6 of 25 Old 08-18-2013, 10:54 PM Thread Starter
RoldGold
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1996 ZJ 
 
Join Date: Jun 2013
Location: Philadelphia
Posts: 317
Well I haven't had the battery disconnected in months. So I'm doubting that is the cause. I'm hoping for low fluid, I'll check tomorrow. And yes, I used ATF+4.

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #7 of 25 Old 08-23-2013, 10:15 PM Thread Starter
RoldGold
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1996 ZJ 
 
Join Date: Jun 2013
Location: Philadelphia
Posts: 317
Fluid is about dead center in the crosshatched region when checked in neutral on a flat surface after cycling through the gears a few times and warming up the trans, and it's a nice color, doesn't smell burnt, etc. What are the symptoms of the failing sensors that are sometimes replaced by other Jeepers when they drop the trans pan?

Thanks to everyone who has responded thus far!

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #8 of 25 Old 08-23-2013, 10:26 PM
coltman151
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1995 ZJ 
 
Join Date: Apr 2012
Location: maryville
Posts: 213
On my dipstick it says check in drive. Idk if its different for year models or transmissions or not.

95 Laredo 4.0, 2" RE BB, RC N2.0 Shocks, Custom Roof-Mount Light Bar w/ 6 lights, Bumpers deleted, Homemade sway bar discos, Michelin LTX 31x10.50s, and a Dog Box :)
Planned: Homemade Spare tire carrier, double shear front track bar, 4 adjustable rear control arms, New Rims and 33" Wrangler MT/Rs or BFG M/T KO's w/ LOTS of trimming.
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post #9 of 25 Old 08-23-2013, 10:37 PM
LordHobbit
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1993 ZJ 
 
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Quote:
Originally Posted by coltman151 View Post
On my dipstick it says check in drive.
That's just lunacy. Let's put the jeep in gear, then stand right in front of it ...

93 red ZJ 190k 4.0. Spent more money than I should have ...

Isn't red the only color a vehicle should be?
If at first you don't succeed, use more speed.
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post #10 of 25 Old 08-24-2013, 01:43 AM
eagsc7
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1994 ZJ 
 
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Location: Sweetwater Cyt
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Quote:
Originally Posted by LordHobbit View Post

That's just lunacy. Let's put the jeep in gear, then stand right in front of it ...
Least it Dont say to check while Driving....

Out Jeepin, usin the Mobile App

My Build Thread: http://www.jeepforum.com/forum/f13/steaks-zj-build-repair-thread-1552698/
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post #11 of 25 Old 08-24-2013, 08:03 AM
ZeeJay1997
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1997 ZJ 
 
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Op, if I'm reading you correctly, there is nothing wrong with your ride. What you are feeling is the torque convertor unlocking when you touch the brake.

When it disengages, it should act like it has shifted into a lower gear.

At cruise, without letting off on the accelerator touch the brake pedal. The RPMs should jump up 100-300.

When coasting down without touching the brake, it should disengage as it passes through 45.

It it didnt do this it would be like stopping a straight shift without depressing the clutch pedal.
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post #12 of 25 Old 08-24-2013, 08:06 AM
ZeeJay1997
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Quote:
Originally Posted by coltman151 View Post
On my dipstick it says check in drive. Idk if its different for year models or transmissions or not.
i think you may have the wrong dip stick. google the part number that is stamped on the stick and see what it is supposed to fit.
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post #13 of 25 Old 08-24-2013, 08:10 AM
newfieZJ
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1995 ZJ 
 
Join Date: May 2008
Posts: 6,557
Could be a TPS issue .

Ever clean the TB and IAC ?
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post #14 of 25 Old 08-25-2013, 08:29 AM Thread Starter
RoldGold
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Location: Philadelphia
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Quote:
Originally Posted by ZeeJay1997 View Post
Op, if I'm reading you correctly, there is nothing wrong with your ride. What you are feeling is the torque convertor unlocking when you touch the brake.

When it disengages, it should act like it has shifted into a lower gear.

At cruise, without letting off on the accelerator touch the brake pedal. The RPMs should jump up 100-300.

When coasting down without touching the brake, it should disengage as it passes through 45.

It it didnt do this it would be like stopping a straight shift without depressing the clutch pedal.
That's what I was thinking. So when the torque converter engages above 45 mph, it's essentially a fifth gear?

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #15 of 25 Old 08-25-2013, 08:31 AM Thread Starter
RoldGold
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1996 ZJ 
 
Join Date: Jun 2013
Location: Philadelphia
Posts: 317
Quote:
Originally Posted by newfieZJ View Post
Could be a TPS issue .

Ever clean the TB and IAC ?
I checked the TPS last winter and it was fine, but it could've gone out by now, I'll check it again. I cleaned the IAC around the same time but I didn't take out the TB and clean it. That's on my list, and I've got a gasket for the TB as well.

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
RoldGold is offline  
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