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96 Mustang 3.8 Rough idle, not MAF?


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dmahoney
New User

Jul 25, 2010, 4:35 PM

Post #1 of 4 (3915 views)
96 Mustang 3.8 Rough idle, not MAF? Sign In

Hello!
96 mustang 3.8.
This felt like it happened overnight...
A little rough idle at start and giving codes of no 3 cyl misfire and bank 1 and 2 lean... However the plug sparks and a replacement MAF didn't help. Once it runs for 1 minute it seems totally fine. Any ideas?
Thank you all!!!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 25, 2010, 5:04 PM

Post #2 of 4 (3903 views)
Re: 96 Mustang 3.8 Rough idle, not MAF? Sign In

Look for a vacuum leak. Listen for a hissing noise and try to follow it to it's source. That car is notorious for sucking holes in the rubber vacuum connectors at the manifold, usually connected to the PCV or other large vacuum supply line.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dmahoney
New User

Jul 25, 2010, 8:21 PM

Post #3 of 4 (3899 views)
Re: 96 Mustang 3.8 Rough idle, not MAF? Sign In

sounds good. Ill give it a shot tomorrow.


randyj
New User

Sep 10, 2010, 10:44 PM

Post #4 of 4 (3856 views)
Re: 96 Mustang 3.8 Rough idle, not MAF? Sign In

I'm not really a mustang guy. But i did just have this same problem with my eclipse. It was my idle air control valve, and my intake gaskets. I replaced them and it idles perfectly.






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