Very slow headlights
Thread Starter
Advanced
Joined: Nov 2004
Posts: 74
Likes: 0
Very slow headlights
They go up slowly and hardly go down at all. I usually ahve to give them a little push to get them down.
Is the problem more likely to be the actuators or some type of leak in the hoses... or neither?
Also, a friend who claims to be in-the -know says, the added cam could have affected the vaccuum on the headlights.
Does any of this make sense? Yes, i know, I 'm new.
Is the problem more likely to be the actuators or some type of leak in the hoses... or neither?
Also, a friend who claims to be in-the -know says, the added cam could have affected the vaccuum on the headlights.
Does any of this make sense? Yes, i know, I 'm new.
Pro
Joined: Apr 2004
Posts: 687
Likes: 0
From: Atascadero Ca
revving the motor up then snapping the throttle plates shut causes a great increase in vacuum.
Turn on your headlights
let em raise
rev her up
take your foot off the pedal at the same time turn off the lights
watch the lights, they should close if the cam is causing your problem.
Otherwise, it could be any number of things.
Sometimes a good lubrication is all that is necessary
Lubrication is the easiest solution so try that
then inspect the condition of your acuators, relays, vacuum tank, hoses, etc.
Turn on your headlights
let em raise
rev her up
take your foot off the pedal at the same time turn off the lights
watch the lights, they should close if the cam is causing your problem.
Otherwise, it could be any number of things.
Sometimes a good lubrication is all that is necessary
Lubrication is the easiest solution so try that
then inspect the condition of your acuators, relays, vacuum tank, hoses, etc.
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
Originally Posted by i885744
revving the motor up then snapping the throttle plates shut causes a great increase in vacuum.
Turn on your headlights
let em raise
rev her up
take your foot off the pedal at the same time turn off the lights
watch the lights, they should close if the cam is causing your problem.
Otherwise, it could be any number of things.
Sometimes a good lubrication is all that is necessary
Lubrication is the easiest solution so try that
then inspect the condition of your acuators, relays, vacuum tank, hoses, etc.
Turn on your headlights
let em raise
rev her up
take your foot off the pedal at the same time turn off the lights
watch the lights, they should close if the cam is causing your problem.
Otherwise, it could be any number of things.
Sometimes a good lubrication is all that is necessary
Lubrication is the easiest solution so try that
then inspect the condition of your acuators, relays, vacuum tank, hoses, etc.
Race Director
Joined: Jun 2000
Posts: 10,049
Likes: 676
From: FL
Could be a vacuum leak. I had a 77 once where someone (Bubba) had disconnected the vacuum lines under the dash that control the heater ducts. This caused enough of a leak to cause slow lights. Don't forget that we have a built in vacuum can for the headlights so unless you try to raise them right after starting the engine, the cam should not have that much of an effect.
Burning Brakes
Joined: Jun 2004
Posts: 1,012
Likes: 5
From: Granbury, TX
There are lots of threads on how to troubleshoot headlight problems. Just search on "headlights".
Before you do all that, check the inline vacuum filter, a little white piece of plastic in line close to the intake manifold vacuum source. After I spent 2 hours trouble shooting my headlight system I checked this filter and found it was almost completely plugged.
I replaced it and now no worries.
Good luck.
Before you do all that, check the inline vacuum filter, a little white piece of plastic in line close to the intake manifold vacuum source. After I spent 2 hours trouble shooting my headlight system I checked this filter and found it was almost completely plugged.
I replaced it and now no worries.Good luck.
Instructor
Joined: Aug 2002
Posts: 231
Likes: 0
From: Tucson AZ
Buy a hand vaccum pump for bleeding brakes (about $30). It has a bunch of connectors that you can check the integrity of each component. Start with your vacuum tank, mine had about 5 holes in it and I got it fixed at a radiator shop. There are miles of vacuum lines (seems like anyway) and you'll need the vacuum layout from one of the threads here. Good luck, it is an ongoing battle for me and my '71. I also have the wiper door that is more complicated than the space shuttle.
Le Mans Master
Joined: Oct 2004
Posts: 5,269
Likes: 54
From: Orlando Florida
St. Jude Donor '05
It may be dirt. I noticed that on the valve that is located at the actuator is no filter (this is where the hoses are slipped on) - I am not sure if this is supposed to be like this.... it would make sense to have a filter (foam) in this location.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski