Surging Idle, delayed and hard shifts, and "jerky" throttle response in reverse - Cherokee SRT8 Forum
WK1 Troubleshooting / Problems Discussion / Dealer Service If you are having some problems with your Jeep Grand Cherokee SRT8 and need assistance in troubleshooting and diagnosing the problem, this is the proper place to discuss it. Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

 
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post #1 of 7 (permalink) Old 04-18-2017, 03:22 PM Thread Starter
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Surging Idle, delayed and hard shifts, and "jerky" throttle response in reverse

As the title states, I am experiencing multiple issues with my WK1 SRT8. I have battled this issue for the past 3 years and am to the point where something needs to be done. My jeep is a 2006 with 86k miles on it. As for aftermarket mods, it has a Volant CAI and catch can installed. The vehicle also has an aftermarket stereo system. All modifications were installed prior to me purchasing the vehicle in 2012 and these issues we'rent happening then. I do not know if the vehicle has a custom tune, but would imagine it does based on the other mods added. Since I have had it, I have had the transfer case replaced (went out at 24k miles due to tire sizes), and the ignition switch has also been replaced due to recall. Other changes have been cosmetic only

My current issues are as described in the title. Usually after "spirited" rides, my jeep will begin experiencing the high rpm/delayed shifts, and a surging idle at low rpms. The surging idle is most noticeable in park and reverse, but not in drive at stops. These symptoms get worse as time progresses until the jeep eventually begins stalling in reverse or struggles to hold rpms above 500 in park which also resulting in a stall. No codes are given during these incidents. If I disconnect my battery for a minute, then reconnect, all symptoms vanish until the next "spirited" ride. This issue also happened the last time I cleaned/recharged the CAI filter.

The last time I took it to a stealership for the issue, they stated it needed a new electronic shift module and tune based on their diagnostics, but no codes were given at the time and I wasn't buying their word without proof. This is the same dealership that stated I needed a new T Case without noticing the tire sizes were incorrect (thanks to you guys here for that insight).

Have any of you experienced this, seen anything like this on the threads, or could possibly offer some insight as to what it could be before I take it somewhere? I would greatly appreciate any advice and am willing to explore all possibilities before taking it somewhere. I do not own a tuner so I am unable to pull any logs or re-flash anything which I would imagine would make diagnostics easier, but I am hoping some of you have seen this before and can point me in the right direction. It's hard to find a knowledgeable and trustworthy mechanic in my area for these jeeps; its always one of the other but not both.
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post #2 of 7 (permalink) Old 04-18-2017, 04:10 PM
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Quote:
Originally Posted by Buddy08 View Post
As the title states, I am experiencing multiple issues with my WK1 SRT8. I have battled this issue for the past 3 years and am to the point where something needs to be done. My jeep is a 2006 with 86k miles on it. As for aftermarket mods, it has a Volant CAI and catch can installed. The vehicle also has an aftermarket stereo system. All modifications were installed prior to me purchasing the vehicle in 2012 and these issues we'rent happening then. I do not know if the vehicle has a custom tune, but would imagine it does based on the other mods added. Since I have had it, I have had the transfer case replaced (went out at 24k miles due to tire sizes), and the ignition switch has also been replaced due to recall. Other changes have been cosmetic only

My current issues are as described in the title. Usually after "spirited" rides, my jeep will begin experiencing the high rpm/delayed shifts, and a surging idle at low rpms. The surging idle is most noticeable in park and reverse, but not in drive at stops. These symptoms get worse as time progresses until the jeep eventually begins stalling in reverse or struggles to hold rpms above 500 in park which also resulting in a stall. No codes are given during these incidents. If I disconnect my battery for a minute, then reconnect, all symptoms vanish until the next "spirited" ride. This issue also happened the last time I cleaned/recharged the CAI filter.

The last time I took it to a stealership for the issue, they stated it needed a new electronic shift module and tune based on their diagnostics, but no codes were given at the time and I wasn't buying their word without proof. This is the same dealership that stated I needed a new T Case without noticing the tire sizes were incorrect (thanks to you guys here for that insight).

Have any of you experienced this, seen anything like this on the threads, or could possibly offer some insight as to what it could be before I take it somewhere? I would greatly appreciate any advice and am willing to explore all possibilities before taking it somewhere. I do not own a tuner so I am unable to pull any logs or re-flash anything which I would imagine would make diagnostics easier, but I am hoping some of you have seen this before and can point me in the right direction. It's hard to find a knowledgeable and trustworthy mechanic in my area for these jeeps; its always one of the other but not both.
Never heard of it in every gear but drive. Hell I even get a surge in drive at stops that make the jeep jump out of nowhere but it is every so often not more than once or twice a 6 month period never gotten any codes from it. Reading around on this same issue someone mentioned getting the jeep tuned by a pro and never having the issue again. From what they experienced at the dealership they said the jeep was trying to find the appropriate idle speed and ussally happens after they drove it hard for a period.

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post #3 of 7 (permalink) Old 04-19-2017, 08:19 AM Thread Starter
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I also noticed the symptoms are more noticeable when the AC is running. I replaced the IAT sensor yesterday thinking that could have had something to do with it and the current one installed appeared damage, but there were no changes when the new IAT was installed.
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post #4 of 7 (permalink) Old 04-19-2017, 08:52 AM
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From what I read the other guy had the dealership replace the TB as they said that was the cause it fixed it for a week then went back to surging so it sounds like a toss up

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post #5 of 7 (permalink) Old 04-20-2017, 07:04 PM
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Sounds like it is the conductor plate off of the VB and TCM. It will cause everything your explaining as imhad that issue. She me times come up in code. Have them check it as it is a easy inexpensive fix.

All Motor......... Just old fashion CI .. Nothing to see here... Just drive by..
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post #6 of 7 (permalink) Old 04-27-2017, 10:08 AM Thread Starter
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Should I take it to a transmission specialist or the dealership to have the conductor plate tested? Do you know about how much that would set me back in parts/labor?
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post #7 of 7 (permalink) Old 05-09-2017, 01:30 PM
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You can try and pick up a plate at a trans shop or call Bill at paramount. He will be able to sell you one probably better then else where. To fix it, I had a shop so it. True Street did mine. But it's not difficult. Plus you can check the VB while doing it to see if any thing is clogged
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