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

Starting problems

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Old Jul 10, 2007 | 03:19 AM
  #1  
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fordman954
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Default Starting problems

I have a 2003 GT and every now and again it will hesitate to start it will just crank, sometimes it will take about 5 seconds to start. It usually only does it whenI have ran the car and whenI leave to go in say the gas station, and come back out, it will do it.. but not every time. And also whenI am at a stop lightI will sit and feel and listen andI can hear a slight mis-fire. I will even watch my tach andI can see it move down just a tiny bit and I can feel it. I run 91 octain andI have tried injection cleaner too, has anyone had the same problem or know whatI can do? Thanks in advance guys
Old Jul 10, 2007 | 03:55 AM
  #2  
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Default RE: Starting problems

My 03 gt does the same thing besides the mis-fire. Leaking injector maybe.
Old Jul 10, 2007 | 05:35 PM
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fordman954
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If it was a leaky injector wouldnt the check engine light come on? Is your car still doing it or did you fix the problem?
Old Jul 10, 2007 | 06:09 PM
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Default RE: Starting problems

how long sense your fuel filter has been changed?
Old Jul 10, 2007 | 06:46 PM
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undecided.steve
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Default RE: Starting problems


ORIGINAL: fordman954

I have a 2003 GT and every now and again it will hesitate to start it will just crank, sometimes it will take about 5 seconds to start. It usually only does it when I have ran the car and when I leave to go in say the gas station, and come back out, it will do it.. but not every time. And also when I am at a stop light I will sit and feel and listen and I can hear a slight mis-fire. I will even watch my tach and I can see it move down just a tiny bit and I can feel it. I run 91 octain and I have tried injection cleaner too, has anyone had the same problem or know what I can do? Thanks in advance guys
The re-start when hot problem is a very common thing.
Try turning your key to 'ON' and then put your seatbelt on, adjust the stereo, etc (IOW give it 5 seconds to build up fuel pressure)
and THEN crank the car.
That works for me every time.
As for why stangs seem to do this, I don't know.

The idle problem may or may not be related.
Clean your IAC and it should go away.
Sometimes what you think is a misfire is really the engine dying.

Old Jul 10, 2007 | 06:55 PM
  #6  
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Default RE: Starting problems

mine did it it was the fuel pump go get the focus svt pump its a direct replacement for your year
Old Jul 10, 2007 | 06:57 PM
  #7  
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ORIGINAL: 964.6gtstang

mine did it it was the fuel pump go get the focus svt pump its a direct replacement for your year

Oh yea!
That will most definitely do it!

I was trying to be optimistic because the pump is pretty reliable.
+1 on going for the Focus pump.
Much better unit.
Old Jul 10, 2007 | 07:42 PM
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Default RE: Starting problems

The fuel filter has been replaced.
Old Jul 11, 2007 | 04:50 PM
  #9  
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00raging stang
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Default RE: Starting problems

i just got my 02' GT and ocassionally it will do the whole hesitate to start thing but i just thought it was more of a common thing because my sixxer did the same thing and my friends 02' GT also does it on ocassion
Old Jul 11, 2007 | 04:52 PM
  #10  
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Do I get the fuel pump for an 03 SVT focus? Or does the year not matter?



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