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  #1  
Old 10-20-2004, 07:53 PM
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Location: Loganville/Atlanta
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Ever had this happen with your ignition switch?

Well here is the latest update. I have narrowed my problem to 2 things. 1) is a bad vac switch on drivers door. Its leaks when the shaft moves from one instance to the other. Part on order. The next thing is I connected my vacuum guage in series to my shut off valve to see how much vacuum was being applied when the key is operated. As expected there is no vacuum signal while the engine is running. When the key is turned off, there is about 15 inches of vacuum applied to the cut off solonoid. This is more than enough to shut the car off immediately. But what happens next perplexes me. When the key is turned back to the start position the vacuum is between 8-5 inches. This should not be. With only 7-8 inches of vac it will hold the cut off solonoid closed so the car will not start. If I cycle the key several times off - on it drops the vacuum to almost 0 and the car starts right up. My guess is the ignition switch is not working right.

Any other suggestions??

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  #2  
Old 12-23-2006, 09:05 PM
Diesel on the brain
 
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Did you ever discover the problem?

-Tad
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  #3  
Old 12-23-2006, 11:40 PM
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yeah, it sounds like something in the valve on the switch is sticking (like carb flood problems) the seat of the seal might have something that is sticky like soot stuck to it or something..I'm sure that if it can be dissasembled and cleaned without destroying anything then you won't have to buy a new switch...

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  #4  
Old 12-24-2006, 09:16 AM
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vacuum

check the little vac device on side of ing switch
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  #5  
Old 12-24-2006, 09:48 AM
Diesel on the brain
 
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Location: Upstate Virginia
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I'm going to attempt to replace that vacuum switch again today. My first attempt failed when I was unable to remove the top screw through the bottom of the dash. I'll pop out the gauge cluster today. I was able to easily remove the top screw from my parts car through the gaping hole where the cluster mounts.

-Tad
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Old 06-01-2007, 10:53 PM
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Did either of you figure out what solved the problem?
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  #7  
Old 06-02-2007, 01:05 AM
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Has Diesel Giant been booted off like the Schuman boys, or does he just not come around voluntarily?
Just curious......
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Old 06-02-2007, 02:11 PM
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Quote:
Originally Posted by JimmyL View Post
Has Diesel Giant been booted off like the Schuman boys, or does he just not come around voluntarily?
Just curious......
He is still a registered user.

Sounds like he had a sticky vacuum switch.
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  #9  
Old 07-29-2007, 07:44 PM
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I have the exact same problem. What is the solution?
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  #10  
Old 08-06-2007, 06:00 PM
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Location: East Hampton, CT
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Resolved

The ignition vacuum switch was not functioning correctly and the vacuum lines were reversed! P.O. replaced the ignition.
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  #11  
Old 08-06-2007, 06:21 PM
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Quote:
Originally Posted by mcguirjf View Post
The ignition vacuum switch was not functioning correctly and the vacuum lines were reversed! P.O. replaced the ignition.
Interesting, Thanks, I've been wondering about that. So you also had 4 inches of vacuum with the key on?

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