Vis motor question

Shogo10 · 12th May 2010, 21:53

Hi
I had my car in for a service the other day and asked if the bloke had a vis tester. He said that he hadn't heard of it but will find out.
So i got my car back and he said he found out that if the vis motors are caput that you will get the check engine light come on the dash to tell you of the fault.
Is this true are the vis motors connected to the ecu in some way to flash up the warning light???

GreyGhost · 12th May 2010, 21:59

Absolute garbage.
No faults are registered when a VIS actuator fails or indeed if the butterflies within the inlet manifold which they operate fail.
VIS tester are a brand new phenomenon created by the inimitable Lates, Stocktake and BigRuss. With assistance from other illustrious members of this club.

Forgive me if I left anybody out.

EnEnGee · 12th May 2010, 22:02

No, the MIL light will not come on if they are not working. The ECU will send the signal to move the valve, which if not working will simply not move. If the VIS valves are not working, you will be slightly down on power and slightly up on fuel consumption, but the engine will run normally and the car will drive okay. My V6 had the balance valve out and I would not have known had I not had it checked at a club meet. The difference when I replaced it was however quite noticeable.

The guy who tested mine was the world famous Stocktake, who I think lives up in Yorkshire. He is one of the members who has built a tester. A session on Testbook (the Rover dealer diagnostics system) at a former dealer will however be able to tell you this (for a fee).

Lates · 12th May 2010, 23:18

Also remember the mil light will normally only come on when a fault exists that causes a mixture related problem as in misfires etc

12th May 2010, 21:53	#1
Shogo10 Newbie Rover 75 2.0 v6 connie SE Join Date: May 2010 Location: Portsmouth Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts	Vis motor question Hi I had my car in for a service the other day and asked if the bloke had a vis tester. He said that he hadn't heard of it but will find out. So i got my car back and he said he found out that if the vis motors are caput that you will get the check engine light come on the dash to tell you of the fault. Is this true are the vis motors connected to the ecu in some way to flash up the warning light???

12th May 2010, 21:59	#2
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	Absolute garbage. No faults are registered when a VIS actuator fails or indeed if the butterflies within the inlet manifold which they operate fail. VIS tester are a brand new phenomenon created by the inimitable Lates, Stocktake and BigRuss. With assistance from other illustrious members of this club. Forgive me if I left anybody out. Last edited by GreyGhost; 12th May 2010 at 22:04..

12th May 2010, 22:02	#3
EnEnGee Posted a thing or two CDT Tourer (SORN) & 2.0 V6 Saloon Join Date: Nov 2006 Location: Sittingbourne Posts: 1,058 Thanks: 2 Thanked 11 Times in 8 Posts	No, the MIL light will not come on if they are not working. The ECU will send the signal to move the valve, which if not working will simply not move. If the VIS valves are not working, you will be slightly down on power and slightly up on fuel consumption, but the engine will run normally and the car will drive okay. My V6 had the balance valve out and I would not have known had I not had it checked at a club meet. The difference when I replaced it was however quite noticeable. The guy who tested mine was the world famous Stocktake, who I think lives up in Yorkshire. He is one of the members who has built a tester. A session on Testbook (the Rover dealer diagnostics system) at a former dealer will however be able to tell you this (for a fee). Last edited by EnEnGee; 12th May 2010 at 22:04..

12th May 2010, 23:18	#4
Lates This is my second home Jaguar XE Join Date: Nov 2006 Location: Coventry Posts: 4,321 Thanks: 56 Thanked 59 Times in 55 Posts	Also remember the mil light will normally only come on when a fault exists that causes a mixture related problem as in misfires etc