This is topic need help with wierd problem in forum Tech Talk at Northern California Ford Owners  .


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Posted by PWR HNGRY 302 (Member # 6000) on :
 
well i have a problem with my mustang.. it keeps tryin to start itself once its started.. i got a new starter. a new selinoid, new ignition switch. new ignition lock . and stil the problem won't go away any ides what could be going wrong??
 
Posted by Blind (Member # 3052) on :
 
power wire going to the starter is probably grounding on something metallic.

is the starter actually cranking, or just hanging on to the flywheel?
 
Posted by QuickSparks (Member # 8826) on :
 
I am confused about what your problem is. Are you saying that the starter motor won't turn off, or that it intermittently turns back on (like when someone turns the ignition key again after the engine is already running)? Does the starter motor begin turning when you put the key in the ignition and turn it to "on" (but not "start")? For now I will assume that your starter only begins turning once you turn the key to "start" and continues turning until you switch the key to "off."

Since you already replaced the starter motor, starter relay, and ignition switch, you may have a wiring problem (have you replaced the clutch interlock switch?). However, I don't think the problem is that the power cable going to the starter motor is shorting. That wouldn't make the starter turn, and would cause your battery to overheat if you kept the key in the "start" position for a long enough time.

Given that two switches must be closed (the ignition switch must be turned to "start" and the clutch pedal has to be depressed) to get power to the starter relay's solenoid, it seems unlikely that you have a few bad wiring connections compounding each other to cause your problem. I still think that the starter relay is the most likely culprit. .

You could test the starter relay by removing it from the car, putting a continuity tester across the big lugs, and applying 12V across the small lugs. When you apply 12V across the small lugs, you should hear the continuity tester buzz, and when you disconnect the 12V, you should hear the buzzing stop. If the continuity tester buzzing continues even after you disconnect the small lugs, then your relay is sticking. If that still isn't it...

You should check all the connections on the ignition switch, clutch interlock switch, and starter relay to make sure that there are no bad splices, broken insulation, or loose connectors. Also ensure that everything is connected properly according the wiring diagram.


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Posted by 89foxstang (Member # 5908) on :
 
^ haha damn awesome explanation +1111111 i bought a "new" solenoid from pepboys and it would keep turning over , got a NEW "new" solenoid and the problem stopped
 
Posted by QuickSparks (Member # 8826) on :
 
Thanks for the +1 [Big Grin]

I haven't experienced this problem myself, but a google search easily found plenty of other cases where someone had a faulty new starter relay. I guess some manufacturers put out poor quality relays. It's a damn simple part, shame on them for messing that up so badly.

89foxstang, where did you get the relay that worked, and what was the manufacturer and part number?

I should also clarify that in my previous post, anytime I referred to a "starter relay" or "solenoid," I was referring to the black cylinder device mounted in the engine bay, not the solenoid in the hump on the starter motor itself. See pic below.

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Posted by 89foxstang (Member # 5908) on :
 
I got it from pepboys again, i guess it was just luck of the draw, i dont have the car anymore so i cant get you a pn sorry man...
 




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