Tin worm attack ...
AO Gold Member
Join Date: Jan 2003
Location: United Kingdom
If you have the traditional throttle cable then try the throttle reset at the end of the PDF as Rob3rto suggests. The idle actuator and the ecu are probably out of sync and so it's being forced open .. this often happens when you clean the throttle with the actuator in place .. it should really be removed. The actuator is the black box on the right side when you look at the throttle body. There are some pics on my greenserpent website under the Idle Saga page .. link to site in signature below.
Check also the throttle cable isn't snagged or has come adrift of the butterfly cam on the left, or that you have an air leak in the intake system ...
If that doesn't work you could try taking the actuator off and replacing it holding the butterfly shut and gently turning the unit so the three hex bolt holes align. That should return the actuator gearing back to the start point.
If neither work, you may have to get the actuator reset on a diag system or, the worse case, the actuator is damaged and needs to be replaced.
HIS: 1998 156 2.0 TSpark with Sport Pack 2, sunroof and hi-level spoiler in Alfa Rosso. V6 intake mod, clear side repeaters and Zeatek undertray.
HERS: 2009 MiTo 1.4 95bhp Turismo arrived 21st November in Techno Grey with colour-coded headlight surrounds.
"If you're driving on the edge ... you're leaving too much room!"
My Alfa156 Web Site - how-to's, piccies, links, useful stuff, etc.