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

she got slow and is hard to start???

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Old 05-27-2007, 02:04 AM
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racer02GTstang
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Default she got slow and is hard to start???

sounds like spark plugs?? but would they make it that much slower? i only pulled my friends 01 cobra with intake and exhuast about 4-5 cars... i use to just take off like he was sitting still.. i am still getting the same amount of boost as before as well. the car takes 30 seconds to 2 minutes to start. what could be wrong? i pulled a plug and it looked fine from cylinder number 1. looks like it has been barely rich but just about right compared to most plugs, no oil or fuel on it. basically brand new looking. they only have 1700 miles on them. car always does put out black smoke on WOT which means its rich.
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Old 05-27-2007, 02:21 AM
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mustangman02232
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Default RE: she got slow and is hard to start???

detonation? fuel somewhere? plugs+ coils?
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Old 05-27-2007, 02:23 AM
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racer02GTstang
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Default RE: she got slow and is hard to start???

it bogs down low as well.. ive never had detonation problems in the past? if a coil was bad... wouldnt it misfire and be noticeable or get a check engine light?
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Old 05-27-2007, 08:54 AM
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1hotdrp
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Default RE: she got slow and is hard to start???

i would think if there was a misfire the cel would come on
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Old 05-27-2007, 05:29 PM
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Default RE: she got slow and is hard to start???

i ran the codes at advanced auto. no codes.. but still a loss in power and hard to start???...
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Old 05-27-2007, 05:32 PM
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svt_97cobra
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Default RE: she got slow and is hard to start???

At WOT does it travel all the way through the rpm's like it is supposed to?
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Old 05-27-2007, 05:49 PM
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Default RE: she got slow and is hard to start???

it doesnt go through the rpms as fast as it use to... when you rev it doesnt hesitate or knock. but under load, its just not that fast.
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Old 05-27-2007, 06:05 PM
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svt_97cobra
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Default RE: she got slow and is hard to start???

Whay kind of spark plugs are you using? and gap?
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Old 05-27-2007, 06:08 PM
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03GTGreen
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Default RE: she got slow and is hard to start???

Maybe a MAF problem, re-calibrate maybe?
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Old 05-27-2007, 06:16 PM
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Default RE: she got slow and is hard to start???

ORIGINAL: svt_97cobra

Whay kind of spark plugs are you using? and gap?
ngk tr6's gapped at .035
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