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

Hesitation, stumbling, lack of power

Old 08-04-2006, 03:19 AM
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97BlackStang
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Default Hesitation, stumbling, lack of power

The BUlllit has all of those symptoms early in the morning on the way to work. It only does it once then it goes away. Its almost as if its running on a couple of cylinders, and cant pull the car. It does have a header leak but I doubt that is the cause of it. The RPMS tend to dive if i stop quickly, it also has a hell of a time starting once in a while, but once she starts she runs extremly strong. Im thinking IAC, or maybe TPS. I just need to know where to start, Im ganna change the plugs and clean/buy a new K&N filter, along with change the oil.
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Old 08-04-2006, 03:20 AM
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monkeydude3
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Default RE: Hesitation, stumbling, lack of power

miles on it? all those could do it
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Old 08-04-2006, 03:27 AM
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97BlackStang
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Default RE: Hesitation, stumbling, lack of power

33xxx, I was also thinking a Vacum line. If the Defroster for the front is on Does the tempture of it stay the same regardless of the possiton of the Temp ****. Cuase mine can be blowing cold or hot which ever I choose.
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Old 08-04-2006, 03:49 AM
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GT_Bob
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Default RE: Hesitation, stumbling, lack of power

Your defrost sounds normal.

If you had a carburetor on that I'd say your choke was hanging up on you. It sounds like it's running way rich. You'll be able to tell if it's running rich when you take out the plugs, ( http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html ).

If that is the problem, it could be several different sensors that would cause a rich scenario. It would be cheaper to get a preliminary diagnostic scan from your mechanic than it would be to just start change out sensors.


Just my .02
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Old 08-04-2006, 04:24 AM
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geetee03
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Default RE: Hesitation, stumbling, lack of power

does it still do it when it is warm?
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Old 08-04-2006, 11:48 AM
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Brute03
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Default RE: Hesitation, stumbling, lack of power

i would get that leak at the header fixed first since leaks before the o2 sensors can throw things out of wack. i have even more cause to believe that has something to do with it because as you said it only does it when the car is cold, when metal heats up it expands thus sealing up that leak a little better.

so i would just get that fixed to rule it out
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Old 08-04-2006, 02:40 PM
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97BlackStang
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Default RE: Hesitation, stumbling, lack of power

The header leak is PROBALY it. After I get this thing all fixed im ganna have it dynotuned and see what it can do.
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