Question about 2002 Ford Mustang

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I have a 2002 mustang gt conv 5 speed while i am driving it just dies i still have power but the rpms drop. i have tryed to pop the clutch to restart and that dose not work i have to turn the key off and it will start right back up then after a block or two it will die again. it acts up the most when it is realy hot outside if it sits in the sun all day and i try to drive it in the after noon it dose this constantly if i wait for night or drive it in the early morning i can run it for hours befor it starts to have issues. it has had a full tuneup, a new mass air,and a new fule pump all with no luck in fixing the stalling

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  • adam_westcot Jul 03, 2009

    i have no power problums the battery is 3 months old and it has not died so it is still being charged also when it stalls i still have power to the car, when it stalls i can be driving and be over 2000 rpms and then the rpms drop to 0

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There are a few items you should check.
This is an electrical issue - and has to do with heat.
If there is a clod or cracked solder joint on the board of any module - the heat makes the components expand - and no longer make connection.

The most likely suspects are the PCM (Powertrain Control Module) and the CCRM (Constant Control Relay Module)... but there are things to check before replacing them.

#1. Check your fuses (F23.4 20A) ( F2.2 20A) (F1.26 30A) (F1.14 30A) all fed the PCM - just because they "look" good does not mean they ARE good. If the fuse is blow or separated at the side leg of the fuse you'll never see that it is bad. Once it heats up - the same thing happens - the filament separates and no connection for current flow.

#2 check relays like the inertia fuel shutoff, PCM power relay, and Fuel Pump relay.The PCM power relay and Fuel Pump relay are a contained module - called a Constant Control Relay Module.

If all fuses and relays check out, and you have tried to read OBD codes (and dont find them) the PCM should be replaced. It does not report errors on itself. Heat also affects older PCMs the way I described above... vibrations or age cause bad solder joints. From thermal expansion - the components inside heat up and enlarge... breaking the power connection and power to your vehicle.

If you have additional questions, please use the "Continue with this expert option" so we are connected in the future.

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If you need additional help - please use the "Continue with this Expert" option so we are connected in the future. If you need - i can provide electrical schematics that may (depending on your skillset) help you to do the electrical troubleshooting.

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Posted on Jul 04, 2009

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Hi,

What you describe is a bad alternator/battery concern. Hook your battery to a 10amp charger for at least 3 hours and try to start. If it starts then you know that the alternator is bad. If it fails to start then you have a junk battery. My vote would be for a bad alternator.

Fame !

Posted on Jul 03, 2009

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