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Old 02-29-2008, 11:30 AM
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Problems caused by vacuum valve on ignition switch

If the vacuum valve that is attached to the ignition switch is going bad what type of symptoms would you expect to have and would it have an effect on the IP shutoff/or not shutting off and would it have an effect on the door locking system?
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Old 02-29-2008, 11:44 AM
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Originally Posted by Diesel911 View Post
If the vacuum valve that is attached to the ignition switch is going bad what type of symptoms would you expect to have and would it have an effect on the IP shutoff/or not shutting off and would it have an effect on the door locking system?

In my case the switch started leaking vacuum and would result in the gradual shutdown of the engine as enough vacuum built up in the shut off valve to shut down the fuel rack. I do not think they can fail the other way looking at how it is built. Probably designed as a fail safe.
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Old 02-29-2008, 01:00 PM
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It would result in not shutting down or taking a long time to shut down. I would try plugging a mity vac into the shut-off valve on the IP and then start the car and give is a pump or two and see if the car shuts down quickly or if it stumbles to a stop. You shouldn't have to give it more than one or two pumps. If you have to give it more or it stumbles to a stop then the valve on the IP is bad. If it's works fine then you may have a bad ignition shut-off valve.
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Old 02-29-2008, 01:44 PM
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Originally Posted by Diesel911 View Post
would it have an effect on the door locking system?
A vacuum leak anywhere can affect just about any other vacuum consumer.
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Old 02-29-2008, 01:58 PM
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Originally Posted by Biodiesel300TD View Post
It would result in not shutting down or taking a long time to shut down. I would try plugging a mity vac into the shut-off valve on the IP and then start the car and give is a pump or two and see if the car shuts down quickly or if it stumbles to a stop. You shouldn't have to give it more than one or two pumps. If you have to give it more or it stumbles to a stop then the valve on the IP is bad. If it's works fine then you may have a bad ignition shut-off valve.
If this is the case, and the valve requires vacuum only to shut the engine down, what could be the cause of the engine not starting?

In my case, after several months of having to shut the engine down manually, it did shut down by the key, but now won't start, that's more likely to be the valve at the ignition switch? Or, is it possible for that valve to fail in the closed position?
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Old 02-29-2008, 04:00 PM
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You might need to adjust the shut off valve linkage. It sounds as though the valve actuated and now is not resetting.
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Old 02-29-2008, 06:54 PM
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I went out this morning and pulled the vacuum lines off the ignition switch and plugged them together. The car started right up, unfortunately, when I put them back on the switch it started right up?
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