Jerk when let off accelerator

[EvenFlow57]

If this has already been asked, i apologize. Has anyone on here experienced the "jerk" when you let off the gas? regardless of what you were doing prior to letting off (cruising, slam on gas, going fast or slow) it doesnt matter, it ALWAYS jerks a little when you let off the gas. Following the jerk, the car slows down at an accelerated rate. ive been told this is some kind of brake assist or engine brake or something, but i also heard it from a dealer which raises a red flag. They may be just trying to cover their tracks from being blamed if something goes wrong. Anyone know anything about this "jerk" when letting off the gas? any help is appreciated!!

[ronh]

mine does it, fery frustrating. The dealer said it was normal

[Lunch Box]

Which transmission do the two of you have?

[EvenFlow57]

I have the CVTII i believe. Its a 2007 Sport 4x4 Automatic.

[Lunch Box]

Well, in that case, the only thing that I can think of is that maybe the transmission is tightening the gear ratio as you let off the gas. That sounds a lot like what happens when you use the autostick and shift down into a high rpm range. I cant really tell you what the cause is, but that sounds plausible to me.

[zackman]

i get this under throttle when my car is cold ill be at 2000rpms driving down my street in the morning and it will cut out at the exact same time every morning. then its fine untill next cold start..its wierd

[Bender]

There was a service bulletin about this on the 07's with the CVT. A PCM update was supposed to fix the problem. Mine went away for the most part after, and then came back a little more, but never as bad as it first was, after another update.

I had to specifically ask the dealer for the fix, and I don't think the thread is on this board anymore, since it was probably from 07. But someone else from the past might remember it.

[lochinprc]

I have a 2009 Compass with CVT and I have noticed the deceleration you are talking about. Usually at low speeds when I let off the gas pedal, it feels simialr to engine braking, which I do habitually when driving a manual, so I kinda like the feel of it, like the CVT is doing the engine braking for me. Most automatics wont do this so I reckon the CVT is good in this respect. If it is in fact a kind of engine braking, that would also mean that you are getting better traction as you decelerate too!

But... If it's decelerating to the point where your engine cuts out or stalls then it sounds like something different.

[tripplec]

My Compass does that engine braking a bit as well. Its not a big downshift but it certainly does not coast or speed up going down a grade like a conventional automatic does.

[TripleC3]

I get it too...and I find it annoying.

Has anyone heard anything from the dealer as far as getting this fixed? I explained the issue to the service department, they couldnt duplicate the problem....

Is this a problem?....or is it normal as they say?

[lochinprc]

It doesnt cause the engine to over-rev so it doesnt seem like a 'problem' to me. More like a feature of the transmission. I think I read somewhere that you can get rid of it....but I just can't remember where...that's right... post no. 7...

But mine is an 09 so that shouldnt be relevant...One thing I cant get used to is coming back to auto from auto-stick mode. The car seems to jerk a bit like as if it upgeared but too early...Seems that if you let th gass off a little just before you switch back it's not such a jerk.

Apart from that I dont mind the cvt.

Anyone ever had their auto-stick gear ratios re-programmed? is that even possible? it seems to get to third way too quick LOL...

[tripplec]

My wife is drive the Compass full time. Everytime I get into it I have to reacquaint my self to the response etc. Like when I went to get her gas filled up. The low fuel light came on.

I notice that LOCHINPRC sig shows CVTII. Is that a 09 version or a optional tranny?

[lochinprc]

I guess they used the 2nd gen CVT in the 09 Compass.

[smokey01]

I have to agree with lochin, Maybe the computer is shifting the cvt at the wrong time. I've noticed the same thing with my girlfriend's equinox. If you want to speed up you really have to push the gas down pretty far and it downshifts and jerks. I think the cvt should stay in tractors and combines where it belongs.

[lochinprc]

Smokey01, I dont mind the CvT most of the time, its just when trying to accelerate with the auto-stick and coming back to CVT that it is a little annoying. Sounds like the Compass's CVT might be a better one than the equinox cause it doesnt seem to jerk unless you are trying to manualize it lol....

[smokey01]

I've driven manuals for so long that whenever i get in a vehicle my foot instantly goes for the clutch and my hand for the gear shift to check what gear it's in. The CVT could be a great transmission but it needs a little refinement yet. I don't know if it's in the mechanics of how it works or if it's in the electronics that controls it but it's come a long way since it was first introduced.

[CompassLimited]

I have noticed that if I have used the autostick and then leave it in automatic mode it performs differantly, often reving to odd shift points and a "jerking" in the tranny. However it will smooth out if I do not use the autostick. I always thought it was poor eprom programing for the fuel to air mix ratios and modified shift points that comes with using the autostick.

I have not used the autostick in months and have no problems in fact the shifts are so smooth when I get into another car and I feel and hear the shifts I am thinking what is wrong then I realise I am not in the Compass.

[IronWoodca]

Glad to see I am not unique with the gearing. I only notice it at low speeds going through Tim Horton's and the odd traffic slowdown. I use the shift for slowing down and then go back to auto. Having said that I did notice the kick down increase trying to pass at 120KM on the 401.

[zackman]

Originally Posted by IronWoodca

Glad to see I am not unique with the gearing. I only notice it at low speeds going through Tim Horton's and the odd traffic slowdown. I use the shift for slowing down and then go back to auto. Having said that I did notice the kick down increase trying to pass at 120KM on the 401.

welcome goes to another ontario owner

[IronWoodca]

Thanks Zackman. Nice to be welcomed

[Shecky]

yay more canadians lol.

[Cherokee]

Originally Posted by lochinprc

I guess they used the 2nd gen CVT in the 09 Compass.

I had the CVT II in my '07, which, at the time, didn't make much sense to me because I wasn't aware Jeep had used it in any of their vehicles, so the second gen. CVT made me wonder, too.

- Cherokee

[tripplec]

I know a dealer said there is a model with low range transmission and was wondering if that was the CVT II I don't recall now to tell you the truth. I never saw the need for that on this class of ride so I did not pursue it. But its useful on the heavy duty Jeeps and other SUV's that can handle a higher load on tranny and transfer case. CVT's are limited there due primarily the ban being the driving force.

I saw an install diagram for Compass cooler. It a con****ed arangement connecting tubes/piping to the rad hoses etc AND Engine oil filter coupler. They are cooling the engine oil which I don't quite follow. I had an AstroVan AWD and thats a big sucker that had one in it. But the engine is well enclosed all around and it get much hotter around it with little space or airflow. That not the case with this or other SUV's hence the confusion on that subsection.

[Cherokee]

I had the engine oil cooler as well, but that comes with the trailer tow package, designed for vehicles equipped for towing as it is expected that those engines will be under a heavier load than just noraml, day to day driving.

- Cherokee

[tripplec]

Yes the manual give you an extra 1000lbs rating for the cooler. Few people order them and putting them on afterward is more of a pain from what I saw unless the shop is very familiar with the process. I don't expect to tow more than 1500lbs anyway and that in the Winter (environmentally cooled then right!!).

[wesleyd]

Originally Posted by tripplec

Yes the manual give you an extra 1000lbs rating for the cooler. Few people order them and putting them on afterward is more of a pain from what I saw unless the shop is very familiar with the process. I don't expect to tow more than 1500lbs anyway and that in the Winter (environmentally cooled then right!!).

Did the cooler install in the driveway took about an hour, that included draining the coolant, the oil installing all the new hoses, cooler itself and new oil filter and new oil and then reusing the coolant. Not that bad of a job if you have all the tools. I tow a 1700lb pop up trailer so I just wanted to be covered for warranty issues but 1500lbs should be cool especially in the winter.

[tripplec]

Originally Posted by wesleyd

Did the cooler install in the driveway took about an hour, that included draining the coolant, the oil installing all the new hoses, cooler itself and new oil filter and new oil and then reusing the coolant. Not that bad of a job if you have all the tools. I tow a 1700lb pop up trailer so I just wanted to be covered for warranty issues but 1500lbs should be cool especially in the winter.

I haven't checked here yet but what they hit you for the cooler kit?

[Beagledad]

same thing with mine 07 80k miles