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2003 Ford Mustang Idle Misfire & Lean codes

Tiny
COOLDBZ12
  • MEMBER
  • 2003 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 36,000 MILES
Ok I have a 2003 Mustang Mach 1 with the DOHC 4.6L V8, my problem is my engine feels like its misfiring on idle, it idles smooth then once in a while totaly random it feels like it twitches, besides idle the car runs great, Only codes ive gotten is running lean on both banks, everytime it comes up I do something to fix what might be causing it clear the code and sometimes it takes a whole month for the code to come back, sometimes its lean on 1 bank and other times on both. This is what ive done. Checked fuel pressure, fuel filter changed, replaced 02 sensors, replaced spark plugs, replaced EGR valve gasket, MAF sensor Cleaned, checked for vacume leaks, checked for exhaust leaks, and ran a fuel system cleaner, I dont know what to try next to fix this problem?
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Sunday, March 30th, 2008 AT 11:54 AM

3 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
I know u said that u checked for vacuum leaks
but 95% its a vacuum leak
and u may need a smoke machine to check for vacuum leaks
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Sunday, March 30th, 2008 AT 12:37 PM
Tiny
COOLDBZ12
  • MEMBER
  • 2 POSTS
Could a Messed up MAF sensor cuase this? What about dirty fuel injectors? Can I just take it to a mechanic job so they can pin point the vacumme leak if there is one? Thanks.
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Sunday, March 30th, 2008 AT 1:10 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Mass air flow sensor yes
injector maybe but I would thing it will give a misfire codes
you should talk with them and be up front with them and discuss the $$ amount
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Sunday, March 30th, 2008 AT 4:03 PM

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