Most common vacuum leaks?
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Joined: May 2026
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Most common vacuum leaks?
I have a 1985 and it has a habit of "hunting" while idle. Sometimes it'll go away but it always returns. I pulled the spark plugs while doing some tune up and noticed they were quite white. Is this lean condition related to that same vacuum leak? It it pretty stock minus the air pump and cat.
Last edited by Allenvet; May 17, 2026 at 07:31 PM.
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Supporting Vendor
Joined: Nov 2025
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From: Cotopaxi, Colorado
Zen Vet Master Level VII
Joined: Mar 2016
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From: Southlake, TX
Try this... Go around to each of your vacuum hoses, pull them off and "snip" off a 1/4 inch of the hose and replace. Over time the hose gets "stretched" as it grips the plastic on the fitting and develops small cracks. A 1/4 inch give it fresh hose to grip. Worked for me.
Pro
Joined: Feb 2001
Posts: 504
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From: Calgary, Alberta, Canada
In my 1985, I found a vacuum leak that, in my opinion, one would not normally find.
The cruise control unit hose (part# GM 6148.M -> 5/32") situated above the battery wore thin over time and was leaking air. I was able to see a faint part number. I ordered and replaced a few feet of hose from the Cruise Control to the connector by the back of driver side valve cover.
I hope this may be of some help.
The cruise control unit hose (part# GM 6148.M -> 5/32") situated above the battery wore thin over time and was leaking air. I was able to see a faint part number. I ordered and replaced a few feet of hose from the Cruise Control to the connector by the back of driver side valve cover.
I hope this may be of some help.
Thread Starter
Navigator
Joined: May 2026
Posts: 9
Likes: 0
In my 1985, I found a vacuum leak that, in my opinion, one would not normally find.
The cruise control unit hose (part# GM 6148.M -> 5/32") situated above the battery wore thin over time and was leaking air. I was able to see a faint part number. I ordered and replaced a few feet of hose from the Cruise Control to the connector by the back of driver side valve cover.
I hope this may be of some help.
The cruise control unit hose (part# GM 6148.M -> 5/32") situated above the battery wore thin over time and was leaking air. I was able to see a faint part number. I ordered and replaced a few feet of hose from the Cruise Control to the connector by the back of driver side valve cover.
I hope this may be of some help.
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