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Old 08-29-2012, 02:18 PM   #1
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Hesitation when cold

Hi everyone. First post about the Roush Mustang I just purchased. Not sure if this is an issue but figured this would be the place to ask.

When I first start my car and put it into gear (5 speed) I have noticed that it feels like it bogs down and doesnt want to go right away. It takes about 2 seconds to catch up with it self and drives normal until I either slow back down or switch gears, then it does the same thing. When the car reaches normal operating temps it has no issues and has from what I can tell all the power it is supposed to have. Is that just what it is with cars like these? Not sure if you can tell what type of car it is so..... 2007 Mustang 427R. Enough said?
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Old 08-29-2012, 03:00 PM   #2
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My 07 does that... but I can't remember if that started after major mods.... I just let it warm up... should do that anyway
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Old 08-29-2012, 05:58 PM   #3
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Check the differential if it have enough oil
If it required new oil there will be a chance to make some noises after u change it
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Old 08-29-2012, 07:22 PM   #4
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Re: Hesitation when cold

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Originally Posted by Silversky545 View Post
should
Keyword. Should lol.

I haven't warmed up a manual car in 12 years

Crossing my fingers.
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Old 08-29-2012, 08:26 PM   #5
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Re: Hesitation when cold

Ill check that out never more thanks. I usually let it warm up for literally one minute or two but who has the patience for more than that?
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Old 08-29-2012, 09:17 PM   #6
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My 07 mustang bucks alot cold, but goes away after driving 1-2 mins, my girlfriend always complains about me letting the car warm up, but you try explaining why, it's like explaining calculus to a donkey
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Old 08-29-2012, 10:03 PM   #7
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Re: Hesitation when cold

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Originally Posted by BaSohol View Post
My 07 mustang bucks alot cold, but goes away after driving 1-2 mins, my girlfriend always complains about me letting the car warm up, but you try explaining why, it's like explaining calculus to a donkey
Haha, got a good laugh at this.

My 06 GT bucks when cold a lot. Just watch the RPMs, and give it 5 minutes.
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Old 08-29-2012, 10:29 PM   #8
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Rule of thumb... cold start idle is @ 1grand wait till it drops to 550 or so.... should solve problem
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Old 08-30-2012, 07:34 AM   #9
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Re: Hesitation when cold

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Originally Posted by Silversky545 View Post
Rule of thumb... cold start idle is @ 1grand wait till it drops to 550 or so.... should solve problem
Idle isn't that low.
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Old 08-30-2012, 08:46 AM   #10
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Re: Hesitation when cold

on my old pre 05 the IAC (idle bypass valve) would go bad and it would act up worse when cold as it controls the idle of the car and didnt work as good when cold vs warmed up. It could be that.

If I remember right ht 427 has the same basic engine as the Gt, cant remember if it has a supercharger on top or not, regardless it has the same valve somewhere.
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Old 08-30-2012, 10:01 AM   #11
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Quote:
Originally Posted by Borii

Idle isn't that low.
Yep...more like 700. Every morning I start mine and let it idle for 30 secs or so until it drops.
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Old 08-30-2012, 10:36 AM   #12
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Stock is 550-ish
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Old 08-30-2012, 10:41 AM   #13
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Quote:
Originally Posted by Silversky545
Stock is 550-ish
That may be. I have a tune so that may have changed it.
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Old 08-30-2012, 10:50 AM   #14
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Re: Hesitation when cold

I dont really know what you would consider stock. My version of stock is what I have which is the 4.6L with a 2.3L M90 Supercharger. Im pretty sure from the way it acts, and the suggestions that everyone has given me, that it is a normal thing for a car like that. My idle speed is right around 700-750.
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Old 08-30-2012, 02:12 PM   #15
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Re: Hesitation when cold

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Originally Posted by Silversky545 View Post
Stock is 550-ish
Stock is 750. If you had that low of an idle, there WAS a problem. Be it spark plugs or what not.
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Old 08-30-2012, 02:30 PM   #16
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Per bama 550... lmr... same thing
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Old 08-31-2012, 06:58 PM   #17
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Quote:
Originally Posted by Silversky545
Stock is 550-ish
Stock , mine was 750rpm. Tuned, all over the map til warm, then 750.
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