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Discussion Starter #1
Has anyone had this?

The past couple of weekends it has been 111-118 degrees in my parts,
and on both occations after driving around town ALOT during the day, the
Rubi has stumbled a few times coming right off idle.

At first I didnt think it happened, but when it was 118 (mirror temp) one
time, I was able to reproduce this stumble when leaving a stop light or
two, and then it went away. Same happened last weekend, but it was
only 112.

Had not happened for 3000 miles before this.

Ideas?
 

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Mine hasn't stumbled yet, but the fan is running ALOT louder now when it get above 90 here. It also doesn't want to upshift till about 3500rpm's when its doing this either.
 

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Bill,


have not had the heat problem .....and i have 4800 miles.

does tend to shift up n down more then i care to hear
on the 215 going west is a slight upgrade towards GV parkway..
 

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Discussion Starter #4
Well the 1500 mile round trip we took 2 weeks ago was through a ton of
different terrain. I now know exactly when the AOD thinks it is time to
shift. I can tell you that the AOD wishes we were running 30" tires (or a
4.56 ratio in the rear end), and it would be perfect.

I only noticed the hesitation after 6+ hours of shopping type driving in
town, where we stopped at over 20 locations, and did almost all driving
in stop/go traffic. Not a common problem.

But still a problem. I could swear that I read in another post somewhere
(maybe even on this forum) that someone else was having that same
exact problem. I know its something that I could never reproduce for a
service department though.
 

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Bill.....
just a thought..... my tires are bigger... so that may be
why i am not having the same heat issue
thinking the Rubi was designed for larger tires but due to DC legal guys....
they took an easy way out.
the computer was re-programed for my larger tires..

try resetting all the computer stuff.... disconnect the battery
tis like a hard re-boot! might help.

let us know what happens.

mac
 

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Discussion Starter #7
Thanks for the ideas.

I like the avatar mac. I spent a couple hours driving around in 120+
heat this afternoon (it got to 124 in some places in town), but could
not reproduce the problem. But i had my wrench with me, ready to
disconnect/re-connect had it done so. Which is probably what I'll do
if it pops up again.

Take it easy, and if you go wheelin this weekend, bring as much water
as you are comfortable carrying. 8)
 

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Bilbo79 said:
Thanks for the ideas.

I like the avatar mac. I spent a couple hours driving around in 120+
heat this afternoon (it got to 124 in some places in town), but could
not reproduce the problem. But i had my wrench with me, ready to
disconnect/re-connect had it done so. Which is probably what I'll do
if it pops up again.

Take it easy, and if you go wheelin this weekend, bring as much water
as you are comfortable carrying. 8)

i was in traffic also fri and did not have an issue with the Rubi..
notice`d 119 to 121 on my mirror thingy.. the motor temp ran
a constant 210.

:wink:
 

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Discussion Starter #9
I saw 125 degrees driving around today. Still waiting for the problem to
show again. But was only making frequent stop & go's for 2 hours or so.
Both other times the problem came in after 5+ hours. Hmm.
 

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My auto '03 has done this on several occasions. It is definately a heat related issue as it has only happened after driving long distances in hot weather and has never happened in weather below 80 degrees. It only seems to do this right off of idle, and feels to me like a fuel starvation issue. Once I'm above idle and past the initial hesitation is runs fine until I let my foot off of the throttle and let the engine drop back to idle. Stopping the engine for a few minutes to let it cool down fixes the issue. I'm wondering if it is a vapor lock problem. I haven't inspected where the fuel lines run in correlation to the exhaust yet, but wonder if there a spot in the fuel line that is getting too hot. With a returnless fuel system the fuel flow through the lines will slow down at idle therefore not providing enough flow to keep this spot cooled off and possibly vaporizing a small pocket of fuel. This would cause the symptoms I've experienced where it runs fine while on the throttle but will hesitate comming off of idle when hot. Again, I haven't had time to check into this, but was one possible issue that I could think of. I'd be anxious to hear everyone's thoughts.
 

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Mine (04' 30,000 miles) is going into the dealer today for the exact same problem except my check engine light came on. Dummy me I reset the puter (disconnect battery cable). The codes should still be stored so dealer should be able to see what happened.

Kinda freaked me out when it all happened....mashed the gas pedal and it bogged out, stumbled and bucked alittle and then off she went.

I also suspect the fan clutch is bad, seems to stay engaged all the time.

I'll post up with what they tell me.



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Hesitates off the line when temps are high outside.

"The past couple of weekends it has been 111-118 degrees in my parts,
and on both occations after driving around town ALOT during the day, the
Rubi has stumbled a few times coming right off idle. ..."

I am new to this group and this is my first post so forgive me if I sound "new". I own an '05 Rubi, Unlimited and I have been having the same problem here in the Palm Springs area. Interested to here about what the dealer has to say. I take mine in on Monday for that and several other odd things that have been going on. Have 20k on LJ and love it, except for the hesitation part.
 

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I'm in vegas as well. I've noticed this problem a little in the past. Seemed to be very noticable today as i was driving around in 110-114 degree weather. Anyone nailed this issue down to vapor lock, etc?
 

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change/clean your air filter.

Had the same issue and finally figured out my filter looked like crap. Have a K&N so threw it in the dishwasher, dried it and oiled it up... all fixed.

... start with the simple stuff first....
 

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I don't think the 4.0 litre likes heat. My 05 doesn't stumble or anything like that (it's been 102-103 here lately) but it sure doesn't have the same power it does in cool weather. I have a K&N FIPK and I sometimes wonder if the open element is not helping with the heat thing.
 

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Hesitation from stop

I just checked with Jeep and the mechanic I spoke with was very aware of the problem. Obviously here in Vegas it gets quite warm during the summer months and they get quite a few calls. He told me that because the engine is so hot that its acutally igniting before compression is complete and thus the lack of power. He says there isn't anything you can do about it. Just an FYI. I feel it most when i've slowed down or stopped for a traffic light and then go to accelerate. Feels like its going to crap then takes off.
 
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