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#1
10-20-2004, 07:53 PM
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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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#3
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...
there's a first time for everything 
__________________
RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport'  ____________________________ FACEBOOK: PANZER450
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#4
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
12-24-2006, 09:48 AM
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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
__________________
1995 G320 2003 C230 Kompressor Coupe 2005 ML500 2007 ML350
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#6
06-01-2007, 10:53 PM
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Did either of you figure out what solved the problem?
__________________
Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#7
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......
__________________
Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#8
06-02-2007, 02:11 PM
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Quote:
Sounds like he had a sticky vacuum switch.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#9
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
08-06-2007, 06:00 PM
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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
08-06-2007, 06:21 PM
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Quote:
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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