87 YJ wont quit running

Tiny
CORKAN53
  • MEMBER
  • 1987 JEEP YJ
  • 111,500 MILES
I have a 1987 jeep yj 4.2 liter straight 6 I have been having trouble starting it and finaly fixed but niw once it starts running it doesnt stop running with the key out of the ignition
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Wednesday, May 1st, 2013 AT 2:15 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
What did you find wrong and how did you fix it?
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Wednesday, May 1st, 2013 AT 2:43 PM
Tiny
CORKAN53
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My nuetral saftey was messing up that along with about ten bad starters and three cylunoids
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Wednesday, May 1st, 2013 AT 3:07 PM
Tiny
CARADIODOC
  • EXPERT
That doesn't tell me anything What was the original symptom? What was wrong with the starters. Ten bad ones suggests you didn't find the real cause of the problem.

Do you have a Chrysler automatic transmission with the neutral safety switch at the left rear just above the pan?

Are you aware there's two different Ford starter solenoids that look the same? Do you have the Ford starter with a single large cable and the solenoid on the fender or do you have the starter with the round solenoid bolted to the top of it?
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Wednesday, May 1st, 2013 AT 3:22 PM
Tiny
CORKAN53
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Most of the starters were just bad they wouldnt work and some of the time the solenoid would stick anx make it keep turning over I got rid of the neutral safety switch but it was mounted on the transmission it is automatic and the solenoid is mounted on the fire wall it isnt dieseling I havent replaced the altinater and I have replaced the ignition a while before today but it has only started doing this today
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Wednesday, May 1st, 2013 AT 3:43 PM
Tiny
CARADIODOC
  • EXPERT
Dandy. If you have the Chrysler transmission, the neutral safety switch was connected to one of the smaller studs on the solenoid. In the other version that stud gets 12 volts switched onto it only during cranking to bypass the ignition resistor. If the second version is used in place of the first one it shouldn't even crank, but if you bypassed the solenoid to get the engine started, it would stay running with the ignition switch off because current would go through the solenoid's coil to the ignition system and keep it powered up.

If this failure to stop just started acting up without any replacing any parts, I would have to guess that switched contact is sticking in the solenoid. I've never heard of that happening but that is the logical conclusion. Pull that small wire off the solenoid. If the engine stops, that contact is sticking.
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Wednesday, May 1st, 2013 AT 4:35 PM

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