Page 1 of 1
Need help with idle
Posted: Sat Mar 10, 2012 2:39 pm
by cynikal
hey everyone im having trouble with the idle on my mustang its a 90 5.0 running MS2 V3.0 my car is idling at about 3000 rpm if i lower the required fuel it idles lower but my drive is not smooth , Iam new to tuning so please be patient i will upload a copy of my datalog and MSQ file thank you in advance
Re: Need help with idle
Posted: Sun Mar 11, 2012 11:38 am
by Bernard Fife
cyn,
You are getting too much air (aka. 'vacuum leak'). Any other problem would slow the engine, not speed it up.
Unlike a carburetor, the engine doesn't go lean, because the controller compensates for the extra air, and as a result the engine speed gets very high.
The vacuum leak might be a missing/leaky hose, a bad, backwards or missing intake/throttle body gasket, a stuck or badly adjusted throttle stop, or a mis-adjusted or mis-configured idle valve; among other things.
Lance.
Re: Need help with idle
Posted: Sun Mar 11, 2012 12:06 pm
by cynikal
thank you i have never had the motor apart so im assuming its not the tb gasket is not an issue ut i will check the throttle stop and idle valve
Re: Need help with idle
Posted: Wed Mar 14, 2012 2:08 pm
by cynikal
Could it be my cold air intake? Taking in too much air
Re: Need help with idle
Posted: Wed Mar 14, 2012 3:19 pm
by Bernard Fife
Could it be my cold air intake?
cyn,
No, not likely. It has to be something that is adding air after the throttle.
Lance.
Re: Need help with idle
Posted: Wed Mar 14, 2012 5:02 pm
by cynikal
Alright I'll have to see if I can figure it out tomorrow other than the high idle the car runs great right now I just noticed that the air intake is sucking in more it seems than normal, before I hooked up the ms the car was a daily driver and the I take was never as loud as it is now so I figured I would ask