40V Intake manifold fix for stuck or sluggish flap pivots (no broken parts)...
03-07-2011, 03:04 PM
#1
AudiWorld Super User
Thread Starter
40V intake changeover repair...stuck pivots
The answers you seek are now in the correct location...Quattroworld >>>
quattroworld.com Forums: 40V Intake manifold fix for stuck or sluggish flap pivots ( w/no broken parts )...
quattroworld.com Forums: 40V Intake manifold fix for stuck or sluggish flap pivots ( w/no broken parts )...
Last edited by silverd2; 09-17-2014 at 02:28 PM.
04-21-2011, 11:17 AM
#4
AudiWorld Member
Join Date: Oct 2006
Posts: 148
Likes: 0
Received 0 Likes
on
0 Posts
Ditto, thanks. Just heard back from Scott while it's under the knife at his shop and he reported one snapped rod and sticky flaps. Will see if he can run through your well documented procedure.
Snap!
That's with 142k miles on the odo, a good 100 or so of them in salty Michigan.
Cheers,
Keith
Snap!
That's with 142k miles on the odo, a good 100 or so of them in salty Michigan.Cheers,
Keith
Last edited by Nurburgringer; 04-21-2011 at 11:48 AM.
05-02-2011, 06:31 PM
#6
Audiworld Junior Member
Join Date: May 2011
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
well that was an adventure.
on my 2000 A8, both actuators are stuck in the stage 1 low speed position. Really stuck: I spent an hour wiggling, spraying, prying, and cursing at one of them and I couldn't get it off. Whats more, the upper spindle is very weak, the aluminum has corroded so much so that the upper triangular stop had actually rotted away. Looks like I'll be hitting ebay...but at least I now know why I have no highway power
on my 2000 A8, both actuators are stuck in the stage 1 low speed position. Really stuck: I spent an hour wiggling, spraying, prying, and cursing at one of them and I couldn't get it off. Whats more, the upper spindle is very weak, the aluminum has corroded so much so that the upper triangular stop had actually rotted away. Looks like I'll be hitting ebay...but at least I now know why I have no highway power
05-03-2011, 07:50 AM
#7
AudiWorld Member
Join Date: Apr 2009
Location: TEX-ASS
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Whilst looking over the Bentley, I stumbled on something that I (for one) did not know. I knew that S8's have different manifolds, with shorter actuating rods, different pivot placement, etc... What I didn't know is that S8 manifolds are 2 stage...both vacuum pods remain evacuated (both levers pulled back) from idle to 5400 rpms, when both release simultaneously, switching from long to short runners....unlike the A8 manifold which releases pods separately, at 3360 & 5200 rpms, long-medium-short runners...3 stages.
Some of the S8/S6 share inlet manifolds depending upon the engine build date but I think for the most part the 4.2 S cars manifolds are essentially the same.
If your flaps are sticky then you will need to disassemble the intake and clean it. Over thousands of miles and many year these collect oil and other nasties.
Trending Topics
05-04-2011, 06:44 AM
#8
AudiWorld Member
Join Date: Apr 2009
Location: TEX-ASS
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Some interesting info, BUT The interior flaps of the manifold do not get stuck...by design, there's nothing in there really to get stuck...doors with rubber gaskets, opening and closing.
Oil "build up" from the PCV system is the main cause of ANY "intrusion" and it does NOT hinder interior operation..in fact it is the ONLY way that the inner pivots (rear...never a problem)get lubricated.
Oil "build up" from the PCV system is the main cause of ANY "intrusion" and it does NOT hinder interior operation..in fact it is the ONLY way that the inner pivots (rear...never a problem)get lubricated.
Last edited by advancedautomotion; 05-04-2011 at 07:00 AM.
05-09-2011, 12:14 PM
#9
AudiWorld Member
Join Date: Apr 2009
Location: TEX-ASS
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
There's a first time for everything just because you don't experience it or you don't believe it, doesn't mean it hasn't happened. A different manifold fixed the issue BTW.
Thanks for the info.
Thanks for the info.
05-21-2011, 11:03 AM
#10
Audiworld Junior Member
Join Date: May 2011
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Wit my 2000 A8, the corrosion is so bad it has turned the aluminum pieces into a dark gray crumbly substance. the pieces that fit into the manifold snapped off clean at the manifold.
Luckily I found a manifold on ebay last week for $100
Luckily I found a manifold on ebay last week for $100