4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Car runs crappy when warm

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Old 06-26-2007, 04:17 PM
  #1  
98MustGT
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Default Car runs crappy when warm

When cold the car runs pretty good, when warm it hesitates when accelerating.

History
Car ran crappy, had code 0307 - misfire number 7
Changed coil, plugs no more codes
Car then lost the engine drive belt and I replaced it
Cleaned the MAF and IAC with carb cleaner

Now when cold it runs better till warm
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Old 06-26-2007, 04:41 PM
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xcodegt
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Default RE: Car runs crappy when warm

Mine runs like crap when it's cold, but it is due to high intake temps caused by my ghetto-fabulous chrome CAI (on the car when I bought it) My intake temps run about 140*+ constantly. It runs excellent when cold, but @ 130*, it starts to fall on its face. If you have a chrome CAI that could be the problem
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Old 06-26-2007, 04:50 PM
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98MustGT
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Default RE: Car runs crappy when warm

no CAI here

Only mods,
subframe connectors
4.10s
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Old 06-26-2007, 05:07 PM
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02StangGuy
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Default RE: Car runs crappy when warm

yea mine does the same thing...runs awesome till it gets hot then it dies on me...theres probly nothing wrong with it, the cars just run better when they are cold
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Old 06-26-2007, 07:19 PM
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98MustGT
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Default RE: Car runs crappy when warm

Ran swell for the past four yerars then all the sudden running crappy, hesitating on acceleration, cruises OK
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