Beaver Posted August 21, 2009 Share Posted August 21, 2009 girlfriend has a mitsi libero and the idle fluctuates between like 900 and 2000 at random times....will do it for a while and then start the car again and will go away. have heard of cars doing it before but cant remember what the possible/probable causes are. am thinking air flow meter maybe? any tips? cheers Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted August 21, 2009 Share Posted August 21, 2009 vacuum leak maybe? Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 ah yes. whats the best way to check for leaks? just do a general inspection of pipes/hoses etc? Quote Link to comment Share on other sites More sharing options...
mikuni Posted August 21, 2009 Share Posted August 21, 2009 I think when Mitsi's do that its a fucked throttle position sensor. Best thing to do would be is to sell it ang get something less Libero. Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 I think when Mitsi's do that its a fucken throttle position sensor.Best thing to do would be is to sell it and get something less Libero. well that sounds gay doesnt it lol. nah not selling it, apart from the idle its a sweet car, perfect for what she needs Quote Link to comment Share on other sites More sharing options...
Insani-T Posted August 21, 2009 Share Posted August 21, 2009 Stepper Motor? These cars have them? My 1990 VR4 would do this when I brought it, turned out to be a stepper motor. Am told its common. Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 Stepper Motor?These cars have them? My 1990 VR4 would do this when I brought it, turned out to be a stepper motor. Am told its common. i have no idea what a stepper motor is.....haha edit...just wikied that shit, sounds intense Quote Link to comment Share on other sites More sharing options...
mikuni Posted August 21, 2009 Share Posted August 21, 2009 Oh, idle control valve. definitely worth giving that a clean out too, if you can. I think you can check for air leaks by taking off the oil cap. If it keeps running you have one, if it stalls you don't. It should get louder too. Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted August 21, 2009 Share Posted August 21, 2009 ah yes. whats the best way to check for leaks? just do a general inspection of pipes/hoses etc? Spray brake cleaner around manifold etc and if it stall then it has a leak is that correct fullas? Quote Link to comment Share on other sites More sharing options...
Insani-T Posted August 21, 2009 Share Posted August 21, 2009 Stepper Motor?These cars have them? My 1990 VR4 would do this when I brought it, turned out to be a stepper motor. Am told its common. i have no idea what a stepper motor is.....haha edit...just wikied that shit, sounds intense Na, just has a plug going into it and 2 or 3 screws. Its either on the throttle body or next to it. Edit: Might be the same thing as the idle control thing Brad is talking about Quote Link to comment Share on other sites More sharing options...
mikuni Posted August 21, 2009 Share Posted August 21, 2009 edit...just wikied that shit, sounds intense take it to a mechanic bro Quote Link to comment Share on other sites More sharing options...
fuel Posted August 21, 2009 Share Posted August 21, 2009 definitely idle stepper motor, it bolts to the throttlebody (two 8mm screws). What usually happens is a coil in the stepper motor will fail and doesn't function like the ECU thinks it should, and keeps going in and out (hence the fluctuating revs) Quote Link to comment Share on other sites More sharing options...
Steelies Posted August 21, 2009 Share Posted August 21, 2009 we deal with stepper motors at work and that sounds like exactly what they do when they shit themselves Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 definitely idle stepper motor, it bolts to the throttlebody (two 8mm screws). What usually happens is a coil in the stepper motor will fail and doesn't function like the ECU thinks it should, and keeps going in and out (hence the fluctuating revs) ahh i see. so just track down a replacement then? is there a way to test it? Quote Link to comment Share on other sites More sharing options...
fuel Posted August 21, 2009 Share Posted August 21, 2009 this link explains the problem - http://www.dsm.org/how-tos/tttt/tttt3.html this link explains how to test it - http://dmtalon.v8eaters.com/ISC.html and another link thrown in for good measure - http://www.vfaq.com/mods/wayback/BradBa ... surge.html Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 this link explains the problem - http://www.dsm.org/how-tos/tttt/tttt3.htmlthis link explains how to test it - http://dmtalon.v8eaters.com/ISC.html and another link thrown in for good measure - http://www.vfaq.com/mods/wayback/BradBa ... surge.html haha cheers man! Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 21, 2009 Share Posted August 21, 2009 It might have a bent pushrod Quote Link to comment Share on other sites More sharing options...
macabre Posted August 21, 2009 Share Posted August 21, 2009 I think when Mitsi's do that its a fucked throttle position sensor.Best thing to do would be is to sell it ang get something less Libero. yeah Should definately sell the mitsi and get a TOYOTA Quote Link to comment Share on other sites More sharing options...
tortron Posted August 21, 2009 Share Posted August 21, 2009 It might have a bent pushrod na its a carb leak for sure Quote Link to comment Share on other sites More sharing options...
Beaver Posted August 21, 2009 Author Share Posted August 21, 2009 It might have a bent pushrod na its a carb leak for sure funny guys Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.