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Starter run-on after truck sits for a week

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Old Nov 5, 2018 | 03:45 AM
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Melrose 4r's Avatar
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Starter run-on after truck sits for a week

My 22re on several occasions has had the starter continue to run after the truck starts. It only happens after the truck has not been started for many days. When it happens I shut it off and it’s fine on the next start. No indication that any wiring has been modified. Not outdoor temp dependent, truck is garaged now. Seems like a relay or solenoid could be sticking or something like that. I have tried nothing...any ideas?
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Old Nov 5, 2018 | 03:59 AM
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From: Colorado
You can check the voltage output by the relay to the solenoid. If you still have power after the key is returned to the run position it is not the starter/solenoid, if you don't have power it's the starter/solenoid.

But being its intermittently doing it that's going to be hard to check I imagine. Might be best off just pulling the starter to get eyes on it and clean it up to see if the problem goes away.
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Old Nov 5, 2018 | 04:26 AM
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Melrose 4r's Avatar
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From: 02176
Originally Posted by Co_94_PU
You can check the voltage output by the relay to the solenoid. If you still have power after the key is returned to the run position it is not the starter/solenoid, if you don't have power it's the starter/solenoid.

But being its intermittently doing it that's going to be hard to check I imagine. Might be best off just pulling the starter to get eyes on it and clean it up to see if the problem goes away.
Thanks. I did a google search after I posted this and found lots of evidence pointing to starter contacts. In my experience they have just failed and never run on, but if I’m going to pull it I might as well be prepared to replace them so I just ordered some off eBay. The fact that it only occurs after the truck has sat a long period makes me wonder about the mechanical pivot in the starter possibly sticking so I’ll check that closely also. No idea the age of this starter but wouldn’t be surprised if it’s original.

Last edited by Melrose 4r; Nov 5, 2018 at 04:27 AM.
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Old Nov 5, 2018 | 04:33 AM
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The magnetic thingy (solenoid plunger) is sticking in the starter. When it does it again, hit the starter with a stick. Should then stop.

Open cover, remove, clean with 1000g sandpaper, reinstall.
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Old Nov 5, 2018 | 07:00 AM
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From: 02176
Originally Posted by ev13wt
The magnetic thingy (solenoid plunger) is sticking in the starter. When it does it again, hit the starter with a stick. Should then stop.

Open cover, remove, clean with 1000g sandpaper, reinstall.
Thanks, will do.
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Old Nov 11, 2018 | 09:01 PM
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Mine did the same thing one night when I was leaving work -- it got hung up running the starter even after the engine was started. This happened about a week or 2 after it began intermittently clicking without turning the engine over. Fortunately, my new starter contacts came in that day, so I hopped on it that night as soon as I got home. Here's the old original contacts next to the new 4Crawler contacts. It's been 5 months and about 5k miles and I can confidently say that this completely fixed the issue.


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Old Nov 12, 2018 | 03:26 AM
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From: 02176
Thanks for the great photos, cbh138!
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Old Nov 12, 2018 | 05:48 AM
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From: nh
my own starter contact replacement (begin with the linked post - continues with the next few posts):

starter removal and solenoid contact replacement
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Old Nov 12, 2018 | 12:09 PM
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Melrose 4r's Avatar
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From: 02176
Thanks, Wally. Great photos on the toyota-4runner.org post.
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Old Nov 12, 2018 | 09:15 PM
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Originally Posted by Melrose 4r
...I shut it off and it’s fine on the next start....
Actually after you release the ignition key, there should already be nothing to keep starter relay, starter solenoid, and starter motor on. IF the starter solenoid were causing it I wonder how shutting the engine off by turning IGN off would also turn solenoid off - unless the issue is with the ignition switch ST1 contacts.
However, I agree abut inspecting the solenoid contacts as mentioned above^^^.
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Old Nov 13, 2018 | 07:08 PM
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From: 02176
Originally Posted by RAD4Runner
Actually after you release the ignition key, there should already be nothing to keep starter relay, starter solenoid, and starter motor on. IF the starter solenoid were causing it I wonder how shutting the engine off by turning IGN off would also turn solenoid off - unless the issue is with the ignition switch ST1 contacts.
However, I agree abut inspecting the solenoid contacts as mentioned above^^^.
I agree there should be no electrical reason for it too run on. The run-on symptoms are common based on my internet and YouTube research.
The reason it runs on seems to be mechanical, with the edge of the plunger hanging up on the worn edge of the contact instead of overlapping correctly.
But we’ll see when I get it apart.
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Old Nov 13, 2018 | 07:50 PM
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Originally Posted by Melrose 4r
...The reason it runs on seems to be mechanical, with the edge of the plunger hanging up....
Yes, sounds more mechanical like this^^^
or plunger sticking like ev13wt mentioned above.
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