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Unread 08-19-2013   #1 (permalink)
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Angry 2001 Mustang GT stumbling on Starting only

My 2001 GT will stumble if i click to the "start" position very Quickly. If I wait 2 to 3 seconds before going to START, it starts with no stumble. We have replaced the fuel pump and filter and it is still the same. there is another thread that discusses stumbling but could not find the answer among all the responses because most talk about rough idle and so on. mine runs fine once it starts. it has 69 K and is parked in winter . this was a former US car...Any help would be appreciated...
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Unread 08-19-2013   #2 (permalink)
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Im leaning towards the electrical, but then again it is somewhat normal for the car to have a lack of power if you instantly start it. as you have noticed when you turn the ignition on and the dash lights up your car starts just fine. your electrical system had enough time to round up the necessary voltage to supply both the starter and spark plugs with the necessary power to start up correctly.
When you start it suddenly you didn't give your electrical enough time to 'wake up' and distribute the energy as it should have.
The above mentioned is what i have come to understand with my own experience and the word of an automotive electrician i know (a bad as mofo at it too).

All the cars i have ever owned wether they be American or import have done the same thing you speak of.

Now assuming something is wrong i would start with the basics. check and clean all grounds in your car. i would lean towards a weak point in your electrical system being the cause. maybe some loose grounds or power wiring. also when you start your car is there any draw on the electrical system? Are the lights on, is the stereo on, are you holding the brake pedal down? Any draw on the system will give you the same symptoms.
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Unread 08-19-2013   #3 (permalink)
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If you take care of your car it will take care of you. i wouldn't start it suddenly unless its an emergency and every second counts.
Personally the way i always start my cars is go to ignition(not starting the vehicle just the dashboard) and wait till the chime stops or a bit after that. (I would advice anyone reading to do the same).that way your electrical is doing its job and your fuel pump had time to spool up or whatever it does which is something i forgot to mention. When you light up the dash you hear the fuel pump turn on and ready up some fuel for the start. start your car suddenly and it doesn't have enough time to do its job thus your hard start. might not of had to be replaced at all.
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His -1996 GT- Steeda underdrive pulleys, SR CAI, SR intake spacer, SR adjustable clutch kit, SPEC stage 1 clutch, RAM steel billet flywheel,magnaflow cat back with pipes cut off after muffles, Tokhico rear shocks, Tokhico front struts not yet installed, Smoked Cobra style headlights. - nickname = Musstang

Hers - 1998 v6 convertible - dual exhaust. - nickname = sexy thang
1999 v6 for sis 35th anniversary edition - stock. - nickname = meh
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Unread 08-20-2013   #4 (permalink)
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I have been starting my car right away with no pause for the past 180,000 miles and never had this happen. If the pump and filter are new you might have a problem with the FPDM, relays, or other fuel related electronics.
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Unread 09-03-2013   #5 (permalink)
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Thanks for the info.... will check some of the electronics.... it is a weird problem as otherwise the car runs great!!
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Unread 09-03-2013   #6 (permalink)
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thanks for the comments... someone else mentioned that maybe I am just too quick to get to the START position....Car runs great otherwise so maybe everything is ok....Thanks again!!
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Unread 09-03-2013   #7 (permalink)
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Good points!!! You may be right because after replacement, there was no difference... there was a lot of crud in the taank so we got rid of that and now I know it is not a fuel pump problem...I bought the car used so had no idea if the pump had ever been changed. thanks again for the info!!
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Unread 09-03-2013   #8 (permalink)
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Tried any of the other tune-up/routine maintenance stuff yet, such as spark plugs?

The first time I changed my plugs (and have noticed this on other vehicles as well), one of the more noticeable improvements was that the engine fired up in a more willing or authorative manner.

Also be sure to check battery voltage (engine not running); even minor deficiencies (a reading of anything less than 12.6V qualifies) can have a noticeably negative effect.
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Unread 09-03-2013   #9 (permalink)
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Lefty's posts above were amusing to say the least.

Hasn't been mentioned yet, but check your fuel regulator. To me, this sounds like a fuel problem so far. Fuel could be leaking out your FPR thru the vacuum line into your intake(more likely). Or it could be leaking thru the injectors(less likely). Both would cause hard starting by way of low initial starting pressure in the fuel system and by possibly being overly rich in the combustion chambers at startup.

You didn't say how long the stumbling lasts. Or if it happens all day long or just when cold. Also, does the stumbling happen after running on its own, or just when cranking?
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Unread 11-17-2013   #10 (permalink)
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OK.... i will check some of those things....thanks...
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Unread 11-17-2013   #11 (permalink)
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It does this just when cranking and it can be hot or cold... now i jst wait a bit but might replace some of the other fuel components....thanks for the input!!
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