4L60E vibration

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Oct 7, 2018 | 03:13 PM

5.7stroker

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From: OH

4L60E vibration

I have a Performabuilt Stage 2 4l60e LS1 that was installed 11/17/2014. Less than 1000k on it and a few track passes.
Car was tuned back in April and it's been running fine but just recently it started shaking bad when it shifts into OD. Doesn't matter if it's city at 55mph or highway, as soon as it shifts into OD, it shakes bad. Is 4th gear bad or is this a converter issue? I didn't take it past 75mph because it gets worse while in 4th as you go from 55mph to 75mph. I had it up to 6500 rpms in 3rd and it didn't shake. As soon as it goes into 4th even at low rpm, it gets bad. Doesn't happen in N or any other gear, only OD.

Oct 7, 2018 | 05:41 PM

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From: OH

Could it be the torque converter lock up solenoid or perhaps a bad wiring harness? Should I unplug the lock up harness to see if it still does it when in OD?

Oct 7, 2018 | 05:43 PM

98CayenneT/A

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From: White Bear, Mn

When you are getting a shudder, keep your foot on the gas and keep your speed and with your other foot press the brake a bit but keep your speed. This will unlock your converter

Oct 7, 2018 | 06:13 PM

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From: OH

When pressing on the brake to unlock the converter, the shudder goes away.

I would think a bad TCC solenoid would throw a code? As I understand it, there is the TCC apply solenoid and the TCC PWM solenoid? How do I futher diagnose if it's the solenoid bad or the converter itself that is bad, or the lockup clutch?

How can I use HP tuners to determine the following? Which PIDs do I need?
- engine misfires during lockup
- engine RPM and trans TIS equal during lockup
- TCCSLIP during lockup

Last edited by 5.7stroker; Oct 7, 2018 at 07:22 PM.

Oct 7, 2018 | 07:54 PM

Jays_SSZ28

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It won't attempt to lock up if it detects misfire.

What is your tcc apply speed (mph) and what are the max and min tcc duty cycle tables set to?

Oct 8, 2018 | 12:29 AM

5.7stroker

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From: OH

I believe it was 96% and 55% but I will double check. I don't think it's anything in the tune causing the issue. It was fine for 6 months on it's current tune and the tune hasn't changed

Oct 9, 2018 | 12:12 PM

joecar

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Also do this: drive in 3rd gear at sufficient speed, you should observe TCC shudder here also.

Sounds like the TCC itself is slipping/shuddering (the clutch inside the converter)... something is wrong with the TCC's friction surface
Check condition of fluid, see if there are any friction specs in it.

edit: typo (ughh, autocorrection)

Last edited by joecar; Oct 11, 2018 at 12:34 PM.

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Oct 9, 2018 | 04:52 PM

5.7stroker

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From: OH

Quote:

Originally Posted by joecar

Also do this: drive in 3rd gear at sufficient speed, you should observe TCC shudder here also.

Sounds like the TCC itself is slipping/shuddering (the clutch inside the converter)... something is wrong with the TCC's friction circuit.
Check condition of fluid, see if there are any friction specs in it.

Doesn't happen in 3rd, I'm sure that has to do with the tune. I think the clutch is messed up and hopefully I won't see glitter in the transpan. At that point, the question becomes TH400 or 4L80E.