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

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Old 01-31-2011, 07:27 PM
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SXGT
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I had my car in the shop for a month. New head gasket, high flow water pump, new intake manifold, new plug wires, flushed radiator, shaved heads.

now my car had a jerky feeling on acceleration. Ideas? I feel like i have lost some power. Idle is smooth. Also the car is kicking when in 4th or 3rd gear and i ive it some gas to speed up, like its trying to accelerate or down shift but it just bucks and kicks.
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Old 01-31-2011, 08:37 PM
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Brute03
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its bucking when you put your foot down? sounds like a misfire to me
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Old 02-02-2011, 12:55 AM
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Davojan59
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that happened to me after my first intake cracked....make sure to pull your COP boots and see if there is coolant in any of the plug holes.
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Old 02-05-2011, 05:05 AM
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I will check that out tomorrow. It does it mainly going up hill. Also will having my heads shaved change the timing ?

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Old 02-05-2011, 11:03 AM
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Xemeth
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The milled heads shouldn't cause a noticeable change in timing.

My question is the shop let you take the car like this? They just did a **** ton of work to an engine and let it go running like **** after "fixing" it. Take it back to them and tell them to fix it and make it run right. They take the whole ****ing engine apart, it should run perfect when put back together.
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Old 02-05-2011, 11:48 AM
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mustangmancp
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Mine did that too when i got my new intake...check ur COPs that what mine was.
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Old 02-05-2011, 11:55 AM
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Bmitchell373
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Yea, sounds like when my cop were dying.
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Old 02-07-2011, 02:16 AM
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it was knocking/kicking/poping today at idle.. its very random, anyway. the COP is the that. Ive never heard of a COP. is it called something else?

Coil on PLUG?

edit: Its time i put new plugs in it anyway, they could be fouled. I have BOSCH platinum series in there, its been long over due for new ones, even though they say that they last 100K miles I like to make it every 30K miles.

Attached Thumbnails Back from the shop-1267558707111.jpg  

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Old 02-07-2011, 04:16 AM
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Originally Posted by Bladerunner
Your shop probably got coolant on one or more of your COP's
and ruined them when they replaced your intake manifold.
I would look into replacing your COP's and spark plugs and
go from there.
Bosch spark plugs are one of the worst spark plugs you could
possibly use on a Ford.
I recommend using Ford Motorcraft
or Autolite spark plugs instead.
O_O really. why ford specifically? I thought autolite was the Kmart brand kinda thing.
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Old 02-07-2011, 04:36 AM
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this shop was the WORST, said it would be a week to replace head gasket/shave heads. Ended up being 3 weeks. charged me $1,485. He told me he spilled coolant on the engine and it would be ruff until it dried.... this guy was so ****ing shady. He did recommend that my plug wires be THICK for best results, that the thin ones break or melt easy. I bought some new ones and had him put those one with the other installs.
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