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Fluttering RPMs

Started by pmezo33, April 13, 2016, 03:54:47 PM

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pmezo33

April 13, 2016, 03:54:47 PM Last Edit: April 13, 2016, 03:57:23 PM by pmezo33
Last couple days I've noticed when accelerating that my car is fluttering a little.  It's only under light acceleration and the RPMs kind of flutter around and not smooth.  Same thing happens if I'm cruising and lightly give gas.  RPMs don't hold steady and kind of just very lightly fluctuate up and down.  I see it on the gauge and I feel it in the car. 

This is a good example of what I mean.  This is not my car, but a good example of what my rpm guage looks like.  Go to the 14 second mark in the video.

https://www.youtube.com/watch?v=yicL_LdgW_Y

No CEL.  Plugs have about 30k miles on them.  Car has about 90k miles.  Any ideas?  This is a 2010 MKS. 

SHOdded

#1
April 13, 2016, 04:17:36 PM Last Edit: April 13, 2016, 04:26:13 PM by SHOdded
Are you monitoring to see if any boost is showing when the flutters happen?  Could be a sticking wastegate, could be a torque converter (early stages).

EDIT:  check carefully for exhaust leaks, particularly if you have aftermarket equipment installed.  Gaskets & clearance ...
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!

pmezo33

#2
April 13, 2016, 04:39:16 PM
I'll hook up the torque pro and monitor boost.  See if anything is going on there.

I really don't want this to be a transmission problem...

Definitely not hearing any exhaust leaks.  Nothing is aftermarket on this car.  Completely stock.

ZSHO

#3
April 13, 2016, 05:07:38 PM Last Edit: April 13, 2016, 05:16:24 PM by ZSHO
Definitely check the boots on the spark plugs for any rips,tears on them especially if there original.  Z  MOTORCRAFT WR6135 {#BL3Z12A402A}   http://www.rockauto.com/en/catalog/ford,2010,taurus,3.5l+v6+turbocharged,1445050,ignition,spark+plug+(coil-on-plug)+boot,10150?a=Referer+www.searchlock.com+URL+%2F also check to see if the wastegate hoses are intact,they do have a tendency to pop off as SHOdded mentioned above.  Z


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|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|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|

pmezo33

#4
April 13, 2016, 06:24:31 PM
Wastegate hoses all look good and connected.  I did the plugs about 30k miles ago and changed all the boots at the same time.  They should all be good too.

If this were a torque converter issue... how exactly is this diagnosed?  Never had an issue with one before.

SHOdded

#5
April 13, 2016, 06:50:22 PM
All the hoses atop the intake manifold also confirmed good & tight?  May look tight, but could be actually coming loose.  Try cleaning the MAP sensors see if that helps any.

30K on plugs should be ok if completely stock.

Too early to diagnose the TC, usually there's some shuddering accompanying it, which does not seem to be the case here?
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!

pmezo33

#6
April 13, 2016, 07:09:24 PM
There's slight shuddering under light acceleration.  Not a lot, but i've felt it a few times. 

SHOdded

#7
April 13, 2016, 07:15:48 PM
Well, I don't think this is it, but check the knock sensor wiring for chafing, ESP since yours is a 2010.  Hopefully as simple as that ...
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!

pmezo33

#8
April 13, 2016, 07:38:14 PM
Wires look good.  Just double checked all the hoses and everything looks good and connected.  It's pretty clean in there.

Cleaned both map sensors about 10 or 20k miles ago.  Those have to be good too.

jpeckinp

#9
April 13, 2016, 07:51:16 PM
Curious if you have this at all times?  I have something like this when I first pull out of my drive in the morning but after that never again and it doesn't happen every day.
2013 SHO Non-PP w/no Mods

pmezo33

#10
April 13, 2016, 07:53:32 PM Last Edit: April 13, 2016, 07:56:19 PM by pmezo33
Quote from: jpeckinp on April 13, 2016, 07:51:16 PM
Curious if you have this at all times?  I have something like this when I first pull out of my drive in the morning but after that never again and it doesn't happen every day.

Started two days ago.  This is a new symptom.  And yes, it's not just right when i start the car.  The car can be on for hours and it will do it. 

SHOdded

#11
April 13, 2016, 08:05:39 PM
I read somewhere that TC problems can start with a sticking valve body.  You have already changed out the trans fluid, right?  How long ago was that?
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!

jpeckinp

#12
April 13, 2016, 08:09:47 PM
I'm hoping mine is just a cold plug problem. I'm going to have them changed soon. Have 56k on a '13 SHO.
2013 SHO Non-PP w/no Mods

pmezo33

#13
April 13, 2016, 08:22:00 PM
Quote from: SHOdded on April 13, 2016, 08:05:39 PM
I read somewhere that TC problems can start with a sticking valve body.  You have already changed out the trans fluid, right?  How long ago was that?

Did a 1x drain and fill about 20k or 30k miles ago, so some fluid was changed, but not all.  Thinking about doing a 3x drain and fill tomorrow.  Hoping that helps.

Thinking about trying this product along with the trans fluid change.  I'm always weary of snake oil products, but this one seems to have pretty good reviews.

http://www.amazon.com/gp/product/B0007ZAJRM/ref=s9_simh_gw_g263_i1_r?ie=UTF8&fpl=fresh&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=desktop-1&pf_rd_r=0JYXZTSWMCBJSBHDBY4K&pf_rd_t=36701&pf_rd_p=2437869742&pf_rd_i=desktop

jpeckinp

#14
April 13, 2016, 09:05:26 PM
What type oil does your car take? It says in the description shouldn't be used with Ford type F ATF.
2013 SHO Non-PP w/no Mods
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