Mustang dies/misses when hot. - Forums at Modded Mustangs
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post #1 of 53 Old July 12th, 2010, 01:41 PM Thread Starter
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Mustang dies/misses when hot.

Im literally stumped on this one guys..

The car has been acting up for about 4 weeks now. It will die/sputter/misfire ONLY after about 25-30+ minutes of driving in HOT weather. Car runs and drives normal under every other condition. Everytime before the car starts to die it develops a misfire and falls on its face one time almost like it has no fuel and then runs ok for another minute or less. Then it ill sputter if nt completely die altogether instantly and makes a kreeking sound as if ran out of fuel. I have replaced the ignition module and i have a brand new MSD TFI coil thats a few months old. The TPS and IAC are new as well. If you wait about 5 or so minutes after it dies to start it back up it will run fine for a little while longer. If you try to start the car up right away the motor turns over for about 5 or 6 seconds and then it barely starts. Sounds like its starving fuel maybe?
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post #2 of 53 Old July 12th, 2010, 01:41 PM Thread Starter
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I managed to get a few vids of what its doing.





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post #3 of 53 Old July 12th, 2010, 01:44 PM
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what codes is it throwing?

[QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]
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post #4 of 53 Old July 12th, 2010, 01:46 PM Thread Starter
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No code scanner.. cel doesn't come on when driving it.

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post #5 of 53 Old July 12th, 2010, 02:53 PM
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go get the codes read at auto zone or something.

but i would guess that the ignition pickup inside the dizzy is bad. its easier to just buy a new dizzy.

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post #6 of 53 Old July 12th, 2010, 03:28 PM Thread Starter
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go get the codes read at auto zone or something.

but i would guess that the ignition pickup inside the dizzy is bad. its easier to just buy a new dizzy.
Im going to try and get it scanned but you think that would cause the erratic ticking sound as well every time it shuts itself off?

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post #7 of 53 Old July 12th, 2010, 03:30 PM
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they cant read obd1 codes around here

http://www.corral.net/tech/maintenan...-koeokoer.html

[QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]
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post #8 of 53 Old July 12th, 2010, 03:42 PM
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that clicking is the fuel pump relay going crazy, and the fuel pump is turning on and off erratically. i would start by replacing the fuel pump relay which is under the drivers seat. and let us know if that changes anything

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post #9 of 53 Old July 12th, 2010, 03:44 PM
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but i would guess that the ignition pickup inside the dizzy is bad. its easier to just buy a new dizzy.
This worked for me.

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post #10 of 53 Old July 12th, 2010, 04:48 PM Thread Starter
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Quote:
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that clicking is the fuel pump relay going crazy, and the fuel pump is turning on and off erratically. i would start by replacing the fuel pump relay which is under the drivers seat. and let us know if that changes anything
It only clicks though when it shuts itself off. Every other time if i shut it off or dont drive it very long its doesn't do that. From what i understand the TFI controls when to turn the fuel pump on and off?

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post #11 of 53 Old July 12th, 2010, 06:07 PM
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Ignition switch...
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post #12 of 53 Old July 12th, 2010, 07:23 PM Thread Starter
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Ignition switch...
Ford dealership just replaced that like 2 months ago..

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post #13 of 53 Old July 12th, 2010, 09:54 PM
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then check continuity on the HOT wire to the ignition switch...with it kicking the fuel pump and other sensors like that i suspect loose or broken wire somewhere, if the ignition switch has already been replaced. More then likely its a wire running along the engine, its gets hot the connection breaks down or the wire expands breaking continuity.
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post #14 of 53 Old July 13th, 2010, 10:51 AM
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so what codes is it throwing

[QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]
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post #15 of 53 Old July 13th, 2010, 12:21 PM Thread Starter
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Originally Posted by mxnate116 View Post
that clicking is the fuel pump relay going crazy, and the fuel pump is turning on and off erratically. i would start by replacing the fuel pump relay which is under the drivers seat. and let us know if that changes anything
Im going to check it out but it's more than just the fuel pump going crazy. It's the injectors, IAC, etc that are ticking/pinging.

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Originally Posted by silver_fox View Post
then check continuity on the HOT wire to the ignition switch...with it kicking the fuel pump and other sensors like that i suspect loose or broken wire somewhere, if the ignition switch has already been replaced. More then likely its a wire running along the engine, its gets hot the connection breaks down or the wire expands breaking continuity.
Im hoping its a bad wire somewhere. I'm going to check it out and i'll get back to you guys when i've figured it out and not so busy with work. Cars been parked in the garage for about 4 days now lol.

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so what codes is it throwing
No place has an OBD1 Ford scanner. I think one of the shops does and i might have them scan it to see if anything useful comes up.

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post #16 of 53 Old July 13th, 2010, 12:23 PM
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I posted a link on how to read your codes

[QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]
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post #17 of 53 Old July 14th, 2010, 01:39 PM
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PIP inside the Dizzy. here is a way to prove that. go loosen the bolt on the hold down, and turn your dizzy one way or the other, it will click and you will hear the fuel pump prime. being as yours is bad, it is making a contact intermittently (sic?) because of the heat soak from the hot engine. Heat makes things expand. try this, get a can of compressed air (like the stuff you would use to clean a keyboard) turn it upside down so that it sprays liquid and aim it at the TFI, it will cool it down quickly and if the problem goes away then you will see...

Wow that was a disconnected post.

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post #18 of 53 Old July 28th, 2010, 04:27 PM Thread Starter
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we put in a brand new dizzy and swapped out pcm's. still does it. Checked/wiggled wries going to ignition switch.. still does it guys. I'm pretty much out of ideas, even my speed shop guy is dumb-founded and he can pretty much fix anything.

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post #19 of 53 Old July 28th, 2010, 05:43 PM
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So like hatch said.... did you read the codes yet?
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post #20 of 53 Old July 28th, 2010, 09:20 PM
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hunting idle, wont keep running, its the number one ford faulty problem, check your IAC

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