5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

check engine light high rpms/ mph

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Old 10-06-2007, 06:22 PM
  #1  
redemption
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Default check engine light high rpms/ mph

is there a general reason why the check engine light would come on at high rpmand then go off as the rpms fall?
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Old 10-06-2007, 06:54 PM
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aode08
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Default RE: check engine light high rpms/ mph

yeah, the ecm has something to tell you.



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Old 10-06-2007, 06:58 PM
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PRO50SC
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Default RE: check engine light high rpms/ mph

Mine does that only when I race. Mine sets a mass air code. Never affected how it runs, so I never cared about it.
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Old 10-06-2007, 06:59 PM
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mattdel
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Default RE: check engine light high rpms/ mph

ORIGINAL: PRO50SC

Mine does that only when I race. Mine sets a mass air code. Never affected how it runs, so I never cared about it.
spoken like a true tech.
my plumber ****s in the woods, too.
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Old 10-06-2007, 07:04 PM
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redemption
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Default RE: check engine light high rpms/ mph

LOL i did run codes but it just says 11 systom ok for both so im clueless
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Old 10-06-2007, 07:05 PM
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95gtdrop
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Default RE: check engine light high rpms/ mph

my 95 does the same thing. reads ok.
it does now effect the way it runs though.
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Old 10-06-2007, 08:38 PM
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aode08
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Default RE: check engine light high rpms/ mph

I just called one of our techs, he said usually it meens you hit the rev limiter or close to it.
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