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Author Topic: RDU "Chatter" while turning?  (Read 354 times)

Offline StinkinLinkin13

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RDU "Chatter" while turning?
« on: April 19, 2019, 08:05:13 AM »
Kinda a longshot but seeing if anyone has experienced this symptom... I noticed yesterday when making a decent relatively slow speed turn I feel a vibration / chatter coming from the rear. I also feel it during moderate to hard acceleration... It kinda feels like the RDU clutches are engaging/disengaging really quickly.... Similar to torque converter shutter but its very obviously coming from the rear end.... I have a very generic U3000 code... Scanners giving no specifics...TIA
2016 Lincoln MKS Ecoboost -

Livernois Catless downpipes with Magnaflow mufflers - Livernois E85 tune - Firestorm HPFP - 3 Bar Map - 160 Thermostat - EPP Hot Pipes - AEM Dryflow Filter - BOV VTA - H&R Sport Springs - 20"x10" Niche Veronas on 275/40-20 DWS06.

Offline SHOdded

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Re: RDU "Chatter" while turning?
« Reply #1 on: April 19, 2019, 09:11:27 AM »
I know a FEW members have had issues with the RDU, the first I heard of was glock-coma.  Usually a whining or grinding sound is the giveaway.  The viscous coupling/ATC portion of the RDU is sealed (I think filled with Motorcraft Mercon LV) has only been pinpointed as a problem in an Edge living in Russia IME.  And no shuddering/chattering there either.

So I would check the wiring between the AWD/4x4 module and the ATC, and see if there are codes stored in the PCM first.  Might be a wheel speed sensor or two at fault also.  You can use AWD related PIDs to see what speed each wheel is turning at.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

Offline ZSHO

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Re: RDU "Chatter" while turning?
« Reply #2 on: April 19, 2019, 01:29:56 PM »
Have you Flashed the car recently! Sometimes similar codes would suggest you Flashed a Tune to ECU,but not quite certain its relevant in your case! Warranty still active! Z
« Last Edit: April 20, 2019, 03:02:12 PM by ZSHO »


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|Airaid-Dry-flow-CAI|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

Offline glock-coma

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Re: RDU "Chatter" while turning?
« Reply #3 on: April 20, 2019, 10:15:52 AM »
As SHOdded mentioned I did have RDU issues. Ford misdiagnosed a pulsing vibration @50+ mph and replaced everting that turns in the rolling drivetrain minus the trans.
The RDU was replaced last and finally corrected the issue.
2010 red candy metallic non PP 402B
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Offline StinkinLinkin13

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Re: RDU "Chatter" while turning?
« Reply #4 on: April 20, 2019, 02:51:19 PM »
I'm still under warranty which is good. I'm about 90% sure its the RDU clutches chattering when power is sent to the rear. I got video recorded from underneath I'll post later.
2016 Lincoln MKS Ecoboost -

Livernois Catless downpipes with Magnaflow mufflers - Livernois E85 tune - Firestorm HPFP - 3 Bar Map - 160 Thermostat - EPP Hot Pipes - AEM Dryflow Filter - BOV VTA - H&R Sport Springs - 20"x10" Niche Veronas on 275/40-20 DWS06.

Offline StinkinLinkin13

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Re: RDU "Chatter" while turning?
« Reply #5 on: May 26, 2019, 04:50:15 PM »
***Update. So took the MKS to the dealership a few weeks ago.... They did end up replacing the RDU under warranty... Also got a new front turbo that was apparently bad (although I only mentioned feed line leak) 🤔. A new multi function switch. Plus they replaced my gutted cats... 😂😂😂.  All's well. Looks like new downpipes are in order.
2016 Lincoln MKS Ecoboost -

Livernois Catless downpipes with Magnaflow mufflers - Livernois E85 tune - Firestorm HPFP - 3 Bar Map - 160 Thermostat - EPP Hot Pipes - AEM Dryflow Filter - BOV VTA - H&R Sport Springs - 20"x10" Niche Veronas on 275/40-20 DWS06.

Offline SHOdded

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Re: RDU "Chatter" while turning?
« Reply #6 on: May 26, 2019, 05:31:18 PM »
Yay, Lincoln warranty!
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

 

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