I'm around 84,000 miles now and the transmission doesn't necessarily shift smooth on my 2009 Liberty ,seems like it's having alot of sluggishness issues, here's where it started:
I bought the hyper-tech programmer for 2008-2010 Liberty's with the 3.7. I tried the regular tune and ran it with 89 octane, initially it performed great and it took out the throttle delay/hesitation and the liberty felt peppier. It also stopped the sluggishness and delays in shifting, in particular the 40-50mph range which was always sluggish since I bought the vehicle in March.
However the tune caused issues with pinging when attempting highway merging even after trying 93 octane and the biggest problem is either the engine or the transmission would "shudder" constantly when attempting to maintain 65mph, it would drive you nuts trying to maintain 65-70mph. I put back the stock tune and these problems stopped.
Now back on the stock tune, my liberty feels "slower" than other stock KK's on the road. On a 45mph stretch of road, I was struggling to keep up with another stock 08-12 KK. My KK keep hesitating and having to downshift and his held speed no problem. The 35-50 range always seems sluggish and I try using tow/haul occasionally, it doesn't make much of a difference. The transmission in general really doesn't shift that smooth or consistent either, it shifts a bit hard at times and other times it's smooth?
The only engine mod this Jeep has is the 4.7 TB mod, which hasn't caused any problems or trouble codes and did improve off-the-line performance. The airbox is stock and airfilter is stock, didn't notice a change in the 35-50 range with either throttle body and it's a bit more responsive than stock.
---The engine has had a tune-up (air filter, plugs changed, replaced air intake temp sensor) and runs smooth/quiet except for a random slight rough idle (almost like an uncomfortable slight chugging you can feel slightly but the rpms remain steady, not sure if it's the engine or transmission honestly) that only occurs on a random occasion if it's left sitting idling for a long time or in traffic a long-time.
----Coils were replaced before the vehicle was purchased, only replaced the plugs because I thought they were causing issues and it did the chugging prior to and after the tb switch. No issues with the cooling system either.
----No check engine light either, checked for codes and it's mainly CANBUS complaining about LED's (alot of the stock bulbs I replaced with LED's). Going to stock bulbs made no difference in driveability.
---Was a well-maintained vehicle prior to purchase with regular fluid changes, including the transmission.
Any suggestions to resolve this? My father owns a 2012 Jeep Liberty with the same transmission and mileage and it shifts seamlessly, don't feel it and he doesn't have the hesitation/sluggishness I have with the transmission in my older liberty. I know the engine computers/wiring are different between the years but it seems like this Jeep has some of the typical 42RLE issues that wrangler guys complained about (05-06 had issues) when I had a wrangler, but I can't find anything in searching about transmission issues, re-flashing, TCM programming for a 2009 liberty.
I would love to have the tune fix this if possible but I don't understand why it was causing issues? I thought I read somewhere specific fuses/relays have to be pulled for the hypertech tune to work properly?
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