Wide open throttle 84%?

ViT · 29th October 2012, 15:12

I thought I would have ago at checking out my throttle cable today. Via my OBDII port I'm getting just 84% throttle? Even when I go to the engine bay and open the throttle as wide as it will go by hand?

Shut, I've got 10% throttle

Is there any way to trigger the ECU to re-asses? Does this have impact on the VIS system never being at 100% throttle?

MangoMan · 29th October 2012, 15:24

I think this is measured against total restrictions, as if there was absolutely nothing in the throttle body, but of course there is, namely the butterfly etc.
And of course you have 10% closed, because it's not closed, you have the Idle Passage.... Actually 11-14% is normal.

ViT · 29th October 2012, 15:39

Quote:

Originally Posted by MangoMan

I think this is measured against total restrictions, as if there was absolutely nothing in the throttle body, but of course there is, namely the butterfly etc.
And of course you have 10% closed, because it's not closed, you have the Idle Passage.... Actually 11-14% is normal.

I thought idle was controlled by the idle control valve? not the butter fly? Otherwise the ECU couldn't make adjustments to the idle?

rover54 · 29th October 2012, 17:47

Try pushing the throttle to the floor 5 times within 10 seconds with the ignition at No 2 ( all dash lights on). It should reset the throttle position switch. You also need to check that there is a bit of slack in the throttle cable so the butterfly is fully closed as idle should be controlled by the idle control valve.

29th October 2012, 15:12	#1
ViT Avid contributor Trophy Blue MG ZT 190+, Union Blue MG6 Magnette TSE and Orange Marmalade MG3 3Style Join Date: Dec 2009 Location: Tenbury Wells Posts: 191 Thanks: 17 Thanked 3 Times in 3 Posts	Wide open throttle 84%? I thought I would have ago at checking out my throttle cable today. Via my OBDII port I'm getting just 84% throttle? Even when I go to the engine bay and open the throttle as wide as it will go by hand? Shut, I've got 10% throttle Is there any way to trigger the ECU to re-asses? Does this have impact on the VIS system never being at 100% throttle? __________________ http://badges.fuelly.com/images/sig-uk/202608.png

29th October 2012, 15:24	#2
MangoMan This is my second home Looking.... Join Date: Oct 2010 Location: England Posts: 10,911 Thanks: 862 Thanked 1,111 Times in 868 Posts	I think this is measured against total restrictions, as if there was absolutely nothing in the throttle body, but of course there is, namely the butterfly etc. And of course you have 10% closed, because it's not closed, you have the Idle Passage.... Actually 11-14% is normal. __________________ *Regards, Bill - (MangoMan).* (Member 00854) http://i1110.photobucket.com/albums/...d.jpg~original

29th October 2012, 17:47	#4
rover54 Retired rover 75 v6 Auto Conn. SE 54 plate LPG and 2006 Rover 75 v6 Auto LPG , 1.8 r75 Manual Join Date: Aug 2010 Location: London Posts: 3,379 Thanks: 0 Thanked 6 Times in 6 Posts	Try pushing the throttle to the floor 5 times within 10 seconds with the ignition at No 2 ( all dash lights on). It should reset the throttle position switch. You also need to check that there is a bit of slack in the throttle cable so the butterfly is fully closed as idle should be controlled by the idle control valve. Last edited by rover54; 29th October 2012 at 17:58..