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-   -   2008 Patriot transmission hunting issue (http://www.jeepforum.com/forum/f98/2008-patriot-transmission-hunting-issue-1227982/)

kadetklapp 06-16-2011 08:37 AM

2008 Patriot transmission hunting issue
 
Bought my '08 Patty back in March. It's just turned 51,000 miles. While overall I'm happy with our purchase, the vehicle has a couple of drawbacks, mainly, poor fuel efficiency especially when you consider how little power it generates. Anyway, recently I noticed when driving that say, if you take off from a stop light or pull out of our driveway and get up to about 30 mph, the Jeep shifts normally, and then when I hit 30 and let off the gas, it begins "hunting" and then winds down in third gear, sort of like on a manual transmission where you would coast in second or third gear without pressing in the clutch. It feels very strange. The only other automatic vehicle I've experienced this in was a Chevy Caprice and minutes later the transmission crapped out.

My wife says when she drives on the interstate to work, it's hunting constantly and lacks power. I unhooked the battery, thinking it needed to "re-learn" it's new owners, but no dice. Before I waste my time at the dealership, anyone had this issue?

Gramps 06-16-2011 09:16 AM

The next thing I'd do is go get the codes run for free at a major auto parts store. It kinda sounds like a servo is hanging up in the trans or it could be a programming problem caused by some electrical issue.

TheHeilis 06-17-2011 09:46 AM

I've had mine act up before and I disconnected the battery for about 20min and the reconnected it. It also helped my performance. It's worth a try.

IRSmart 06-17-2011 11:35 AM

your car actually has no gears in it, it is a CVT. are you familiar with these transmissions?

Gramps 06-17-2011 05:15 PM

These are not our specific CVT's but similar.

http://auto.howstuffworks.com/cvt.htm

http://www.makcotransmissionparts.co...df/REOFO9A.pdf

kadetklapp 06-20-2011 12:45 PM

Quote:

Originally Posted by IRSmart (Post 11722487)
your car actually has no gears in it, it is a CVT. are you familiar with these transmissions?

Yes I'm aware, I was just using the term to describe where the trans was "at" when these issues were occurring.

I believe it is failing. It's getting continuously worse and gas mileage is in the toilet. I will not take it to the dealer until it grenades.

kadetklapp 06-20-2011 12:47 PM

Quote:

Originally Posted by TheHeilis (Post 11721869)
I've had mine act up before and I disconnected the battery for about 20min and the reconnected it. It also helped my performance. It's worth a try.

Like I said, I've already tried this to no avail.

Rubes 06-20-2011 12:49 PM

I have a '10 Riot with 23k...it's experiencing the "hunting" as well at the same speed. It drives me crazy while in traffic. I talked to a Jeep mechanic and they said it probably needs to "re-learn". Makes me want to disconnect the battery and turn on learning mode.

IRSmart 06-20-2011 02:09 PM

Quote:

Originally Posted by kadetklapp (Post 11736494)
I will not take it to the dealer until it grenades.

that's like saying "my chest hurts, even though i think i'm having a heart attack, i'm going to wait until a black out to go to the hispital"

if you think it's having problems, take it there now. don't be a dummy and wait until the transmission causes damage to the rest of the drivetrain. the longer you wait, the more $$$ it will take.

Gramps 06-20-2011 02:27 PM

At least take it SOMEWHERE for a diagnostic check.
@ Rubes - it's the cheapest and quickest fix, if it works.

kadetklapp 06-21-2011 07:51 AM

It's not going to cost me a dime, the thing is under warranty.

As far as "relearning" I've tried that with no success. I did find out that the stupid thing will erase your presets three or four times AFTER hooking the battery back up for some reason though.

May try and get rid of the turd here soon.

Rubes 06-21-2011 08:54 AM

Quote:

Originally Posted by kadetklapp (Post 11736494)
Yes I'm aware, I was just using the term to describe where the trans was "at" when these issues were occurring.

I believe it is failing. It's getting continuously worse and gas mileage is in the toilet. I will not take it to the dealer until it grenades.

My gas mileage is stable from 24.5 - 26.5, depending on how much I use the A/C.

Eggdashure 06-21-2011 08:53 PM

My Stealership told me that was "how the CVT transmission works". I argued that the whole vehicle should not LURCH, and he kept going back to the same rhetoric telling me that I should not let off the gas unless I'm going to "Immediately" push on the brake.

They've "reprogrammed" mine several times with no success. I'm tired of taking the vehicle in over and over only to have it work properly for a couple days before reverting back. :thumbdown:

I've begun using the Auto-stick for the time being. :rofl:

Though to be fair...the vehicle was in an accident, passenger side was swiped.

Rubes 06-21-2011 10:09 PM

Quote:

Originally Posted by Eggdashure (Post 11744879)
I've begun using the Auto-stick for the time being. :rofl:

How do you use the stick: let off the gas when slapping the stick or do you keep the gas going? Just wondering...I've tried both ways. When I let off the gas after slapping into 3rd, it feels like it's hunting for the gear...

Eggdashure 06-21-2011 11:21 PM

I'm trying to run it in low RPM's, so the hunting / lurching seems less evident. Shifting around 2K...but without a clutch, it's easily forgotten. "Why am I at 4,000 RPM's? Oh yea!" :D

For the most part I'm following the instructions of my stealership in keeping the throttle engaged. It does make a difference, but I thought that adaptive transmissions were supposed to adapt to us...not the other way around. :brickwall


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