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Old 07-12-2021   #1
emorse
 
Join Date: May 2021
Location: Waynesboro, VA
Posts: 9
Default Clicking noise

1991 year. When ignition is turned on (engine not started) I hear a consistent clicking noise from the engine compartment. Stops when vehicle started or ignition turned off. Thoughts from anyone? Thanks.
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Old 07-12-2021   #2
Karl
 
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Join Date: May 2013
Location: Chicago
Posts: 980
Default Re: Clicking noise

Air pump for the secondary fuel injectors?

Is it coming from under the passenger side headlight?
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Old 07-12-2021   #3
emorse
 
Join Date: May 2021
Location: Waynesboro, VA
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Default Re: Clicking noise

using a stethoscope sound is heard most near brake lines at the front wheels.
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Old 07-13-2021   #4
mlipmd
 
Join Date: Mar 2021
Location: Crawfordville, FL
Posts: 216
Default Re: Clicking noise

Secondary vacuum pump, underneath the PS headlight near the coolant tank. It should only run for a few seconds on initially turning on the key, then shut off and run a few sec. a short while later. If yours is running continuously you have a vacuum leak you have to find.
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Old 07-13-2021   #5
emorse
 
Join Date: May 2021
Location: Waynesboro, VA
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Default Re: Clicking noise

Thanks.
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