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  #13  
Old 08-04-2014, 04:00 PM
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Re: Cherokee Shutter on initial acceleration

The second time I took it to the shop a regional Chrysler rep was brought brought into the picture, he provided three possible fixes, they were performed and nothing changed, wobble still there. He indicated that the rear transmission mount was the probable culprit, it was being re-engineered and manufacture ramping up, shipping in three to four weeks. My dealer contacted me with this info in addition to my options, bottom line, they bought me out and I in turn bought a Grand Cherokee from them. Problem solved.

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Old 08-14-2014, 01:58 PM
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Re: Cherokee Shutter on initial acceleration

When i bought mine the dealer filled it with 87 octane and it did the same thing so i went through the tank of 87 then filled it with 91 and the shutter or stumble went away and responds a lot better and the mpg seems to be around 2 better and this is mostly intown driving. My next tank will be 89 and will see if it runs better than the 87. Here in ca 91 is .18 gal more than 87 and .08 more than 89. Time will tell lol.
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Old 08-14-2014, 09:58 PM
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Re: Cherokee Shutter on initial acceleration

That is certainly a different twist, never thought about increasing the octane of fuel, I wonder if you are on to something. There are a lot of people experiencing the shudder on accel from a stop. We were bought out by the dealer and purchased a Grand Cherokee. We were not going to be able to rebuild confidence in the vehicle after the unsolved issue.
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Old 08-14-2014, 10:40 PM
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Re: Cherokee Shutter on initial acceleration

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Originally Posted by landlp View Post
That is certainly a different twist, never thought about increasing the octane of fuel, I wonder if you are on to something. There are a lot of people experiencing the shudder on accel from a stop. We were bought out by the dealer and purchased a Grand Cherokee. We were not going to be able to rebuild confidence in the vehicle after the unsolved issue.
My wife even noticed the shudder was gone and also said it ran much better and she knows nothing about a car lol. One thing i found out that driving in sports mode it keeps the tranny from going into 6,7,8,9 and held it in the gears longer. Its like the srt8 5 speed as it changed the shift patterns a tad.
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Old 08-24-2014, 05:35 PM
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Just curious why people use 87 octane when the owners manual says 89 for the 3.2V6? Axels and transmission are rarely the cause of stumble on straight easy acceleration. The 3.2 is higher compression than the 3.6 Pentastar the dealers are used to dealing with. It most likely has some aggressive computer control to prevent spark knock. The stumble is probably the computer trying to deal with preignition under load caused by the lower octane fuel.

Just a thought.

Mike
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Old 08-24-2014, 05:44 PM
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Re: Cherokee Shutter on initial acceleration

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Originally Posted by MTC595 View Post
Just curious why people use 87 octane when the owners manual says 89 for the 3.2V6? Axels and transmission are rarely the cause of stumble on straight easy acceleration. The 3.2 is higher compression than the 3.6 Pentastar the dealers are used to dealing with. It most likely has some aggressive computer control to prevent spark knock. The stumble is probably the computer trying to deal with preignition under load caused by the lower octane fuel.

Just a thought.

Mike
In my hand book it calls for 87/89 and im on my 2nd tank of all 3 testing and the 1st test was the 89 was the best in mpg but the 91 was the best for gas pedal responds. I just finished my 2nd test with 87 anmd the mpg was no diff that the 1st time and now im on my 2nd test of 91 and it seems to be a lot better that the 1st test and im about half way through it then ill go to the 89 and finish up. Now when i go to the track with our group ill be using 98 octane with a lot of oxygen which is a 50/50 mix of 91 & vp109 to make as much hp as possible as were only running the 1/8 mile. Im hoping the higher compression of 10.7 will help.
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