vtec2011 Posted December 9, 2012 Share Posted December 9, 2012 I recently cleaned out the throttle housing just to maintain my MB3. I have cleaned the butterfly flap and the housing with WD40 and a toothbrush (looking good and shiny! ) The next morning when I went to start the car, it was reving a little higher than usual because more air is going through after cleaning the throttle. But when its fully warmed up, it revs up and down between 1000 to 1200rpm. It usually idles at 750rpm. I have also noticed after decelerating from 2000rpm, it comes back down to 1500 slowly and then suddenly drops down to 1000rpm again. I checked all the hoses, connections and leaks but I cannot find anything. Thanks for reading, hope you can help Quote Link to comment Share on other sites More sharing options...
10000rpm Posted December 9, 2012 Share Posted December 9, 2012 You didn't disconnect any did you? Should have really used carb cleaner maybe check your iacv. Also check your throttle cable is not causing the problem Quote Link to comment Share on other sites More sharing options...
vtec2011 Posted December 9, 2012 Author Share Posted December 9, 2012 Ye, I disconnected everything from the throttle housing. 2 water hoses, 1 air hose and 2 electric plugs. The throttle cable seems fine, not too tight or too loose. It could be the iacv, I will check it out tomorrow. Thanks Quote Link to comment Share on other sites More sharing options...
10000rpm Posted December 10, 2012 Share Posted December 10, 2012 Did you remove the iacv pipes at all? also which 2 plugs did you remove are your sure they havent been switched? Quote Link to comment Share on other sites More sharing options...
vtec2011 Posted December 11, 2012 Author Share Posted December 11, 2012 I didn't remove the iacv pipes. But I think I messed up the map sensor which is on the throttle housing. I might swap it for the other throttle housing which came of a 1.6. They look the same. But first i'm taking the throttle housing off again to replace the gasket as it didn't look good Cheers Quote Link to comment Share on other sites More sharing options...
10000rpm Posted December 11, 2012 Share Posted December 11, 2012 If the gasket is no good that could be your issue it could also be the map sensor causing the problem hope you get it sorted Quote Link to comment Share on other sites More sharing options...
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