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Old 08-12-2018, 06:23 PM   #1
Volvo Kid
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Default Car keeps running with ignition coil disconnected

While I was trying to find the cause of a rough idle issue I disconnected one of the ignition coil wires to turn the car off and instead of stalling the engine continued to run roughly. I also completely disconnected the main coil wire that goes to the distributor and the car did the same thing. I have never seen or heard of this happening before and I want to see if anyone has any ideas for what might cause this. The car is a 1979 242 with a 1992 B230F and LH3.1 swap.

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Old 08-12-2018, 06:31 PM   #2
Mbeas96
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lol that's nuts...my jeep did that one time with a huge vacuum leak (I put seafoam in thru the brake booster connection to the intake). key out of the ignition but the motor kept going until I hooked the brake booster line back up.
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Old 08-12-2018, 06:32 PM   #3
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Is it dieseling? My old carbd corolla did that. Give her the ole Italian tuneup or water torture.
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Old 08-12-2018, 06:47 PM   #4
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My 90 240 does diesel when shutting down and it pings under load sometimes, would this also benefit from seafoaming? Or manual remove and clean head and piston tops?
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Old 08-12-2018, 06:55 PM   #5
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Lol... Dieseling. Turn the key off and it will stop straight away as fuel is cut.
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Old 08-12-2018, 08:47 PM   #6
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Quote:
Originally Posted by JohnLane View Post
Lol... Dieseling. Turn the key off and it will stop straight away as fuel is cut.
Oh yeah..forgot the whole injector thing. What would cause an EFI car to continue to run after it’s shut off?
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Old 08-12-2018, 09:58 PM   #7
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Quote:
Originally Posted by JohnLane View Post
Lol... Dieseling. Turn the key off and it will stop straight away as fuel is cut.
Leaking fuel injectors and carbon buildup or a really high SCR (unlikely here) can allow a gasoline engine to overrun / diesel.
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Old 08-12-2018, 10:08 PM   #8
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Quote:
Originally Posted by PromiseRing View Post
Oh yeah..forgot the whole injector thing. What would cause an EFI car to continue to run after it’s shut off?
Nvm. Forgot OP only pulled the spark. OP you have a carbon buildup or something on the pistons.
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