RPM Hesitation / Stuttering - JeepForum.com
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post #1 of 17 Old 10-08-2019, 08:54 PM Thread Starter
sheridantj
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RPM Hesitation / Stuttering

RPM hesitation
2009 WK with 113K on a 3.7 V6. When my foot is lightly pressing the gas pedal, the rpm jumps up and down around 1500 rpm. I have replaced the plugs, wires, coil packs, crank shaft sensor, IAC, and air filter. I’ve also cleaned the throttle body and used a full can of sea foam in my gas tank. This is an intermittent issue and has not thrown any codes. Never had a stalling issue. If you have any advice, please let me know!

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post #2 of 17 Old 10-08-2019, 10:06 PM
Jwick76
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Throttle position sensor? had a 500rpm jump, crazy idle...replaced it on my 06 wm and no more issues... like $15 on ebay

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post #3 of 17 Old 10-09-2019, 04:21 AM Thread Starter
sheridantj
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I don’t think the 09 has a tps unfortunately.
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post #4 of 17 Old 10-09-2019, 04:51 AM Thread Starter
sheridantj
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My next two ideas are either replacing the throttle body or the accelerator pedal sensor. Both parts aren’t cheap, so I was hoping to come across someone who had the same issue and solved it.
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post #5 of 17 Old 10-09-2019, 07:26 AM
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Quote:
Originally Posted by sheridantj View Post
RPM hesitation
2009 WK with 113K on a 3.7 V6. When my foot is lightly pressing the gas pedal, the rpm jumps up and down around 1500 rpm. I have replaced the plugs, wires, coil packs, crank shaft sensor, IAC, and air filter. I’ve also cleaned the throttle body and used a full can of sea foam in my gas tank. This is an intermittent issue and has not thrown any codes. Never had a stalling issue. If you have any advice, please let me know!
DTCs or pending codes?

How much is the tach moving ~200 Rpm? or more / less? What speed are you traveling or is this at all speeds ? Flat road or slight incline? could be lockup torque converter or OD shifting problem. Have you tried running in tow/haul or moving the gear selector to 5th ?

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #6 of 17 Old 10-09-2019, 08:49 AM Thread Starter
sheridantj
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No DTC codes. Flat surface. I see about a +\- 200 flux with any gear. It’s around 1500. My foot is barely on the pedal and it’s intermittent.
Very frustrating.
I don’t have a tow package option to try.
When I manually shift gears or am giving it more gas, it shifts perfectly with no stuttering.
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post #7 of 17 Old 10-09-2019, 09:01 AM
Jwick76
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Quote:
Originally Posted by sheridantj View Post
I don’t think the 09 has a tps unfortunately.
thats how my 07 liberty is, its built into the TB and you have to replace the whole thing. solved her shuddering while in gentle acceleration...

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post #8 of 17 Old 10-09-2019, 11:45 AM
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Quote:
Originally Posted by sheridantj View Post
No DTC codes. Flat surface. I see about a +\- 200 flux with any gear. It’s around 1500. My foot is barely on the pedal and it’s intermittent.
Very frustrating.
I don’t have a tow package option to try.
When I manually shift gears or am giving it more gas, it shifts perfectly with no stuttering.
Sounds to me like it could be a TCC issue. Lockup should be right around 1500RPM and full lock should change RPM by about 200. There is a gradual modulation of the TCC that is supposed to happen in the middle, but it sounds like it may not be happening in your case. I THINK if you drive around in 4th or 5th, that turns off the TCC lockup , but I'm not 100%sure ...
A good scan tool will tell you the % of TCC solenoid activation.

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
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post #9 of 17 Old 10-09-2019, 05:56 PM Thread Starter
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Are the symptoms for a failing TCC solenoid and throttle body the same?
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post #10 of 17 Old 10-09-2019, 08:32 PM
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Without proper diagnostics with a capable scanner anything is possible...

Do you have a scanner capable of reading all the modules and live data? Key dance doesn’t go deep enough.

That said, throttle body issues are usually apparent at idle and almost never at a specific rpm. Tcc issues would only be seen when the vehicle is in motion or at least with the transmission in drive.

Either way, IMHO without any DTCs to guide you in some way, throwing parts at the issue probably won’t fix anything.

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #11 of 17 Old 10-10-2019, 06:09 AM Thread Starter
sheridantj
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I will have to get ahold of a scanning tool. Thanks for the advice. I’ll post the solution once this is figured out.
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post #12 of 17 Old 10-10-2019, 03:37 PM Thread Starter
sheridantj
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Went and had it scanned at a local auto supply store and there were zero codes.
I don’t want to throw anymore money at it. Not sure what to do at this point.
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post #13 of 17 Old 10-10-2019, 03:50 PM
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Your going to need a real garage with a real scan tool and live data and actually see what's going on as it's happening. That or live with it until a hard failure shows up .

did you try driving around in 4th or 5th like I suggested ?

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #14 of 17 Old 10-10-2019, 04:03 PM Thread Starter
sheridantj
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I can try the 4th and 5th gear tonight and let u know. Thanks
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post #15 of 17 Old 10-10-2019, 06:50 PM
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looks like the same TB as the liberty v6. $72 on ebay. https://rover.ebay.com/rover/0/0/0?m...2F183984230652

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