• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Start issues?

  • Thread starter Thread starter cookcr
  • Start date Start date Sep 11, 2007
C

cookcr

New Member
May 24, 2007
13
0
0
Brighton Colorado
Sep 11, 2007
#1
  • Sep 11, 2007
  • #1
Sometimes when i fire up my car it starts right away, sometimes i have to crank a little while for it to turn over(nothing major just enough to know somethings wrong). I was told it was the fuel filter, any other ideas? Dont want this thing to crap out on me, my trucks out of commision for another week on a new build so i dont want to just dig in and tear it apart right now till i have another vehicle.
 
B

BobHyatt

New Member
Aug 7, 2007
378
1
0
Sep 11, 2007
#2
  • Sep 11, 2007
  • #2
hook up a fuel pressure gauge to the valve on the fuel rail. When you turn the key on does it jump to 40+ psi or does it stop at 8-10? If 8-10 does turning it off and back on again run it on up to 40? Fuel pump is getting ready to go out if so.

Best way to diagnose is to measure things. Guessing can get expensive and frustrating. If the motor turns over normally, but sometimes takes longer to fire up, it is almost certainly a fuel issue. Pump is the first thing that comes to mind, not the filter. If pressure is low at the rail, you can always check the flow before / after the filter to see if it really is clogged. But most of the time its going to end up in the tank (the pump)...
 
S

stangg01

New Member
Mar 17, 2006
129
0
0
Sep 11, 2007
#3
  • Sep 11, 2007
  • #3
I had a similar problem. I cleaned my IAC (Idle Air Control) valve. I've had no issues since.

Cleaning the IAC valve is really easy. Do a Google search for instructions.
 

Superhereaux

chicks make me feel inadequate
Founding Member
Jul 30, 2002
538
3
59
South Texas
Sep 11, 2007
#4
  • Sep 11, 2007
  • #4
does it only do it when the car is already warmed up?

like gassing up for 5min. then restarting?
 

1Phat5Liter

New Member
Jul 22, 2007
37
0
0
Los Angeles, CA
Sep 11, 2007
#5
  • Sep 11, 2007
  • #5
How's your battery/charging system?
 
C

cookcr

New Member
May 24, 2007
13
0
0
Brighton Colorado
Sep 12, 2007
#6
  • Sep 12, 2007
  • #6
My battery/charging seems just fine. It will do it after its been running for a while, take a trip, shut it off and when i start it, it will do it sometimes. Should be able to check fuel pressure tommorow.
 

the98stang

Active Member
Aug 12, 2005
2,408
0
47
Clovis, CA
Sep 12, 2007
#7
  • Sep 12, 2007
  • #7
You have to let the fuel pump fully turn on. So put the key in the ignition, turn it to the on position, and WAIT until you see the digital odometer (or until the radio turns on). Then try to start the car. See if it does the same thing.
 
S

steve_stang2003

New Member
Apr 18, 2007
195
1
0
Sep 12, 2007
#8
  • Sep 12, 2007
  • #8
the98stang said:
You have to let the fuel pump fully turn on. So put the key in the ignition, turn it to the on position, and WAIT until you see the digital odometer (or until the radio turns on). Then try to start the car. See if it does the same thing.
Click to expand...

+1
It seems to be a common problem with these cars.
Mine used to do it on restarts, like the car is warmed up, I turn it off for a couple of minutes and then restart.

Now I turn the key to on, put on seatbelt etc and THEN try and start and it fires up every time.
 

streethorse

15 Year Member
Oct 8, 2005
1,042
6
58
Dallas Texas
Sep 12, 2007
#9
  • Sep 12, 2007
  • #9
If the fuel filter and battery are original from 2002 they both need to be replaced.
 

03ghoststang

Well-Known Member
Jul 16, 2005
1,930
1
57
Los Angeles, California
Sep 12, 2007
#10
  • Sep 12, 2007
  • #10
ahhhh the good old hot start problem these cars have....well i have done the fuel filter, cleaned the IAC valve went away for a while but now it only does it occasionally .........and yes i do wait for the system to prime everytime
 

281CI96Coupe

Member
Oct 30, 2006
233
0
16
Sep 12, 2007
#11
  • Sep 12, 2007
  • #11
Yeah what is up with the "the hot start problem" why does it start nice cold, start funny hot, I dont get it?
 

wilsonc2222

Member
Apr 28, 2005
32
0
7
texas
Sep 13, 2007
#12
  • Sep 13, 2007
  • #12
fuel pump

cookcr said:
Sometimes when i fire up my car it starts right away, sometimes i have to crank a little while for it to turn over(nothing major just enough to know somethings wrong). I was told it was the fuel filter, any other ideas? Dont want this thing to crap out on me, my trucks out of commision for another week on a new build so i dont want to just dig in and tear it apart right now till i have another vehicle.
Click to expand...
my car stopped on me sunday. i think its the fuel pump. after sitting for about
30 minutes. it started. i had no pressure at the fuel rail. now i have thirty psi
when its running but as soon as i turn the key off it drops to zero. i called my local
ford dealer and they said it could be the fuel pump, fuel pressure regulator or the constant control relay module. my car started doing like yours and it got to where
i had to cycle the key on and off 3 or four times before it would start. i disconnected the vacuum hose from the fuel pressure regulator and the pressure
went from 30 to 40 psi. i think its the fuel pump or the CCRM. i'm changing the fuel pump first. ford wanted $99.00 to tell me what the problem is. i may be sorry
but i'm going to change paarts until i fix it
 
B

BobHyatt

New Member
Aug 7, 2007
378
1
0
Sep 13, 2007
#13
  • Sep 13, 2007
  • #13
wilsonc2222 said:
my car stopped on me sunday. i think its the fuel pump. after sitting for about
30 minutes. it started. i had no pressure at the fuel rail. now i have thirty psi
when its running but as soon as i turn the key off it drops to zero. i called my local
ford dealer and they said it could be the fuel pump, fuel pressure regulator or the constant control relay module. my car started doing like yours and it got to where
i had to cycle the key on and off 3 or four times before it would start. i disconnected the vacuum hose from the fuel pressure regulator and the pressure
went from 30 to 40 psi. i think its the fuel pump or the CCRM. i'm changing the fuel pump first. ford wanted $99.00 to tell me what the problem is. i may be sorry
but i'm going to change paarts until i fix it
Click to expand...

If pressure drops to zero immediately, it is likely the pump. It certainly isn't the CCRM. That's just the thing that contains the fuel pump relay. The relay contacts can burn, which will reduce the current flow to the pump, which will reduce pressure or flow rate. But it is supposed to hold pressure when the key goes off. For minutes not 1 second...
 

blstang

New Member
May 23, 2006
26
0
0
Sep 13, 2007
#14
  • Sep 13, 2007
  • #14
the98stang said:
You have to let the fuel pump fully turn on. So put the key in the ignition, turn it to the on position, and WAIT until you see the digital odometer (or until the radio turns on). Then try to start the car. See if it does the same thing.
Click to expand...


that worked for me when i had problems myself on my 04.
 

Superhereaux

chicks make me feel inadequate
Founding Member
Jul 30, 2002
538
3
59
South Texas
Sep 13, 2007
#15
  • Sep 13, 2007
  • #15
wilsonc2222 said:
i'm changing the fuel pump first. ford wanted $99.00 to tell me what the problem is. i may be sorry
but i'm going to change parts until i fix it
Click to expand...

throwing parts at a car is the worst thing you can do time and money-wise to fix a problem

i could go on for DAYS telling you why and giving examples but i'd prefer to watch TV instead
 
4

40oz

Member
Jan 9, 2006
499
3
18
Minneapolis
Sep 14, 2007
#16
  • Sep 14, 2007
  • #16
I've noticed that when I've been running the AC, the car takes an extra second to start when hot. Leaving the key in the on position for a minute doesn't help. If I haven't been running the AC or the car is cold, it starts right up. All I can guess is the the AC compressor clutch is still engaged or there is some other load preventing immediate starting. Not something I'm willing to pay to "fix" at this point, however.

No way I'd start swapping parts without a diagnosis from an expert who actually looked at the car, i.e. a Ford dealer tech. And at that point, I'd rather pay them to fix it right than keep running around until the problem is solved.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
Sep 16, 2007
#17
  • Sep 16, 2007
  • #17
steve_stang2003 said:
+1
It seems to be a common problem with these cars.
Mine used to do it on restarts, like the car is warmed up, I turn it off for a couple of minutes and then restart.

Now I turn the key to on, put on seatbelt etc and THEN try and start and it fires up every time.
Click to expand...



Yup, VERY common problems on these cars.


I do the same thing now. Turn key to on, let the fuel pump cycle for a couple seconds and then crank it and it usually helps.

I've heard it's IAC related, but i haver yet to try to clean mine
 

the98stang

Active Member
Aug 12, 2005
2,408
0
47
Clovis, CA
Sep 16, 2007
#18
  • Sep 16, 2007
  • #18
40oz said:
I've noticed that when I've been running the AC, the car takes an extra second to start when hot. Leaving the key in the on position for a minute doesn't help. If I haven't been running the AC or the car is cold, it starts right up. All I can guess is the the AC compressor clutch is still engaged or there is some other load preventing immediate starting. Not something I'm willing to pay to "fix" at this point, however.

No way I'd start swapping parts without a diagnosis from an expert who actually looked at the car, i.e. a Ford dealer tech. And at that point, I'd rather pay them to fix it right than keep running around until the problem is solved.
Click to expand...

Are you starting the car with the AC on? That would cause more load, making it harder for the car to start.

Maybe your battery is slowly dying? Only other thing I can think of is your injectors/fuel pump are having a hard time at start up.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
Sep 16, 2007
#19
  • Sep 16, 2007
  • #19
the98stang said:
Are you starting the car with the AC on? That would cause more load, making it harder for the car to start.
Click to expand...


The A/C does not come on when you start the car.

If you have the selector in A/C, the car will start without engaging the compressor.

Once the engine is running, there is a delay of about 2 seconds before the compressor kicks in. If you have the windows down you can hear it click on afterwards
 
B

BobHyatt

New Member
Aug 7, 2007
378
1
0
Sep 16, 2007
#20
  • Sep 16, 2007
  • #20
the98stang said:
Are you starting the car with the AC on? That would cause more load, making it harder for the car to start.

Maybe your battery is slowly dying? Only other thing I can think of is your injectors/fuel pump are having a hard time at start up.
Click to expand...

Should not hurt cranking at all. PCM turns compressor off until engine is cranked and running.
 
You must log in or register to reply here.

Similar threads

N
Engine 86 GT no start/stall
  • nweber
  • Jul 28, 2026
  • Fox 5.0 Mustang Tech
Replies
6
Views
119
Fox 5.0 Mustang Tech Jul 29, 2026
AeroCoupe
S
ECU/PCM ISSUE
  • Santi1015
  • Jun 29, 2026
  • SN95 4.6L Mustang Tech
Replies
2
Views
143
SN95 4.6L Mustang Tech Jun 29, 2026
Santi1015
S
L
1997 V6 Starting issue
  • leanzik04
  • Mar 20, 2026
  • SN95 V6 Mustang Tech
Replies
3
Views
253
SN95 V6 Mustang Tech Mar 20, 2026
Noobz347
R
Microsquirt tune for stroked 351W in a foxbody
  • roldy
  • Jul 26, 2026
  • Digital Self-tuning Forum
Replies
6
Views
118
Digital Self-tuning Forum Yesterday at 7:53 PM
roldy
R
B
Engine Another no start after washing engine bay
  • bruno
  • Apr 26, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
738
Fox 5.0 Mustang Tech May 7, 2026
AeroCoupe
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?