Engine won't stop - Ford Mustang Forum

 
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post #1 of 6 (permalink) Old 06-26-2013 Thread Starter
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Engine won't stop

On my 1969 with an unknown year 302 or 5.0l, I replaced the starter coil and ignition control module at the same time. The engine started and ran fine. When I turned the ignition key to off, the engine kept running. I pulled the ignition coil to distributor cable to get the engine to stop and then disconnected the battery. She wasn't doing this before.

Could the engine continuing to run be related to either of these components or do I have a new problem? Help, I'm stumped.

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post #2 of 6 (permalink) Old 06-26-2013
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It's either going to be the solenoid or the ignition. 90% sure it's the solenoid. I had the same issue and they have a high failure rate. They stick.


2014 F-150 STX Sport SCab - Stock

1967 Coupe 306 roller block, E303 cam X302 heads, Crane 1.7RR, T5, 8.8 rear 3.73, CSRP Power discs
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post #3 of 6 (permalink) Old 06-26-2013 Thread Starter
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Thanks. That makes sense and is easy to check. I'll put the old starter solenoid beck in and try again.
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post #4 of 6 (permalink) Old 06-27-2013
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LS3 is probably right. My first choice would be the ignition switch. Check it with a volt meter and see if power to the coil dies. Good luck

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post #5 of 6 (permalink) Old 06-27-2013 Thread Starter
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I have been checking some vendor website for reviews on these "cost competitive" starter solenoids. Some of the comments reflect the same symptoms that I experienced. The root cause for those examples was a solenoid that stuck closed, sometimes with the starter remaining engaged. There were also reports where the engine continued to operate because the coil voltage sourced through the stuck-closed solenoid. I should have done more research before ordered the replacement part.
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post #6 of 6 (permalink) Old 06-27-2013
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Yessir, I bought the inexpensive one first also (trying to save a minuscule amount of money, ie being cheap) and it failed right out of the box with the symptoms you've described. I then bought the nicer one, gray in color instead of black and it works fine. I think it said premium or something of that nature, it wasn't more than $5-7 more.


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2014 F-150 STX Sport SCab - Stock

1967 Coupe 306 roller block, E303 cam X302 heads, Crane 1.7RR, T5, 8.8 rear 3.73, CSRP Power discs
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