Topic: please HELP!! headlights
in Forum: C3 Body


[QUOTE=blu72]
Connect a vacuum gauge to the system just after the port from the intake. Measure, it should be 18 - 20 inches. If not, pinch off the vacuum lines suspect for leaking.....the vacuum will come back up and the miss will go away. Cylinders 6 & 8 get leaned out and she'll miss a little bit making it rough idle. A good diagram of the crazy vacuum system is very helpful and it'll make sense as you move along.
You'll go nuts just ripping pieces apart trying to find problems. The visual indications on you gauge will lead you down a path much easier to find the leak. It can be anything......I gave up and replaced most everything because "everything " leaked just a little bit causing a "big" leak and a miss. The biggest leak was the vacuum switches for the wiper door and the two seperate switches for the headlights on my 72. Even the replacements leaked - I sent one back for warranty replacement.....
Bruce
[/QUOTE]
Moderator
The over-ride is normally up all the time.
If BOTH lights come down when you turn the switch off, my guess would be your problem is in the light-switch itself. It's highly umlikely that both actuators, and both vac. relay valves took a dump at the same time. I'd start with the switch: check the vac. lines to it, and see if one fell off, or sumpthin. Then swap the top & bottom lines on the relay valves, just to see if now the lights would go up, but not down. That would verify all the vac. lines, actuators, and the relay valves, leaving the lightswitch as the culprit.


Joel Adams
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