Need help with idle
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Need help with idle
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
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Bernard Fife
- Master Squirter
- Posts: 475
- Joined: Thu Oct 29, 2009 12:54 pm
Re: Need help with idle
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.
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.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw
Re: Need help with idle
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
Could it be my cold air intake? Taking in too much air
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Bernard Fife
- Master Squirter
- Posts: 475
- Joined: Thu Oct 29, 2009 12:54 pm
Re: Need help with idle
cyn,Could it be my cold air intake?
No, not likely. It has to be something that is adding air after the throttle.
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw
Re: Need help with idle
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