viensal Posted June 18, 2014 Share Posted June 18, 2014 Hi, I have a 1994 EA82 installed on a VW bus and I have a problem with idle speed, maybe someone could help to find path of the problem. The idle is too fast, I don't have RPM but I would say around 1200rpm, here is the steps that I have validated * Butterfly screw is just above the butterfly mechanical contact. * Idle screw don't have any effect on the idle speed * Idle switch working I have performed the timing last week and I was able to adjust the idle by the screw at 750rpm for proper timing with test mode jumpers on. What else could overide the screw ? thanks for your input. Alex Quote Link to comment Share on other sites More sharing options...
naru Posted June 18, 2014 Share Posted June 18, 2014 Throttle not closing- "Butterfly screw is just ABOVE the butterfly mechanical contact." An unmetered air or vacuum leak. CTS is telling the IAC to fast idle. A faulty IAC. A faulty idle switch or associated wiring. How does it idle w/the IAC disconnected? Quote Link to comment Share on other sites More sharing options...
viensal Posted June 18, 2014 Author Share Posted June 18, 2014 Butterfly is just above, If i unscrew more the plate will jam in to the throat. I have removed the the idle switch and turned on the engine, then turned with a screw driver the switch. Idle pass from around 1200 to 2500 when I turn the switch so i consider the switch working and transfer properly the signal to the computer. I will check later today if IAC is working well, how the engine should react when I disconect it ? Throttle not closing- "Butterfly screw is just ABOVE the butterfly mechanical contact." An unmetered air or vacuum leak. CTS is telling the IAC to fast idle. A faulty IAC. A faulty idle switch or associated wiring. How does it idle w/the IAC disconnected? Quote Link to comment Share on other sites More sharing options...
TallonX Posted June 18, 2014 Share Posted June 18, 2014 Make sure your throttle cable has slack, tension will leave it open and not sit on the idle screw Quote Link to comment Share on other sites More sharing options...
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