Help needed to find out if variable inlet manifold moves when engine is revved - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 11 Old 02-08-10 Thread Starter
Status: Much happier now
AO Member
 
DangerousDave74's Avatar
 
Join Date: Apr 2009
Location: United Kingdom
County: Nottinghamshire
Posts: 534
Hmmm Help needed to find out if variable inlet manifold moves when engine is revved

I am led to believe that my inlet manifold is not working.
I know it runs off a vacuum and was wondering if when the car is idling it still worked/moved even when engine is only revved.
Mine doesn't as you can see it rotate when disconnect/reconnect the electrical connector between the VIS and the manifold but won't when the engine is running.
Is it possible for anyone else to check on their car and see if it moves on theirs when the engine is running?
DangerousDave74 is offline  
Sponsored Links
Advertisement
 
Status: Hey Joe...
AO Gold Member
 
iainfm's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
Posts: 6,274

Member car:

Jaaaaag

Have you got AlfaDiag? You can command it with that and watch it move...

Cheers,

Iain
iainfm is offline  
(Post Link) post #3 of 11 Old 02-08-10 Thread Starter
Status: Much happier now
AO Member
 
DangerousDave74's Avatar
 
Join Date: Apr 2009
Location: United Kingdom
County: Nottinghamshire
Posts: 534
Hi Ian, I will try that tonight.
But can you tell me if it moves when the car is stationary and just revving the engine which would simulate driving?
DangerousDave74 is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
I have a feeling it will only move when the engine is under load.
symon is offline  
(Post Link) post #5 of 11 Old 02-08-10 Thread Starter
Status: Much happier now
AO Member
 
DangerousDave74's Avatar
 
Join Date: Apr 2009
Location: United Kingdom
County: Nottinghamshire
Posts: 534
but i would have thought that if it runs off a vaccum then surely the concept of the car being under load is no different than the car just being revved.
DangerousDave74 is offline  
Status: zzzzzzzz
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 37,076
Quote:
Originally Posted by DangerousDave74 View Post
but i would have thought that if it runs off a vaccum then surely the concept of the car being under load is no different than the car just being revved.
I think there is a solenoid which switches the vacuum on and off when the ECU tells it to.
symon is offline  
(Post Link) post #7 of 11 Old 03-08-10 Thread Starter
Status: Much happier now
AO Member
 
DangerousDave74's Avatar
 
Join Date: Apr 2009
Location: United Kingdom
County: Nottinghamshire
Posts: 534
but when does that happen?
DangerousDave74 is offline  
Status: Hey Joe...
AO Gold Member
 
iainfm's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
Posts: 6,274

Member car:

Jaaaaag

Could you not put some kind of marker on the actuator rod that would leave some kind of tell-tale mark when it moved?
iainfm is offline  
Status: Rh - C8H18
AO Member
 
Speedmaster's Avatar
 
Join Date: Nov 2009
Location: Bulgaria
County: Stara Zagora
Posts: 377
Garage
The ECU knows when car is moving, so it makes sense that VIM is activated only when driving.
Speedmaster is offline  
Status: 3,75 running great :)
AO Car Of The Year Winner 2015
Membro Medio
 
gotcha's Avatar
 
Join Date: Dec 2003
Location: Slovakia
County: Bratislavsky
Posts: 3,202
I put here pretty good info on variable intake as I studied it quite deeply when I installed in on TS.

https://www.alfaowner.com/Forum/tunin...-on-1-6ts.html

If you dont find info you need there, ask.

Manifold can be operated 2-3 times even when the engine is off. It runs on vacuum. Like brakes. whenn you turn the engine off, you can brake 2-3 times and then pedal gets hard as the vacuum is used and servo doesnt work. The same with manifold. The solenoid is operated by 12V, when there is no voltage is in short position and when you apply 12V on its pins it switches to long position. you can operate it with a cable attaced to the battery 2-3 times with engine off. Than you need to restart the engine to built vaccum so that it works again.

normal operation of manifold is
0-2800 rpm short
2800 - 5200 long
5200 - limiter short

147GTA,Grigio Metallico,Imola leather,3.75l conversion,ported heads,F575 TB,Carbon plenum,Stainless manifolds,EQ pipes,Supersprint silenced cat back,18" GT multispokes,KW V3,Galfer 6pot 355mm,Brembo sport rear

147 1.6TS, Nerro,Beige Interior,Galfer Extreme Brake kit,2,0TS intake manifold,Custom ex. manifold,200CPI cat,Supersprint silenced center + OO backbox,GTA spoiler,GTA side skirts,GTA headlights,Blaupunkt LA MP74 + Focal + MacAudio + Dynamat + HERZ subwoofer
gotcha is offline  
(Post Link) post #11 of 11 Old 08-08-10 Thread Starter
Status: Much happier now
AO Member
 
DangerousDave74's Avatar
 
Join Date: Apr 2009
Location: United Kingdom
County: Nottinghamshire
Posts: 534
But does it work when the car is stationary and the engine revved?
DangerousDave74 is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
engine , find , inlet , manifold , moves , needed , revved , variable

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
OBD II Codes Smaky Alfa 145 & 146 62 14-08-19 13:36

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome