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Home » Public Forums » GMCnet » A couple 'issues' I'd like some advice on. (A 'cough' and low vacuum)
Re: A couple 'issues' I'd like some advice on. [message #270905 is a reply to message #270901] Sat, 31 January 2015 21:22 Go to previous messageGo to previous message
C Boyd is currently offline  C Boyd   United States
Messages: 2629
Registered: April 2006
Karma:
Senior Member
Hi Kerry, seems if your vacuum reading is better when cold might indicate a leak from a joint which would tighten when hot where as a crack would open when hot. I might suggest spraying wd-40 on all bolted or screwed joints while idling and watch the vacuum gauge closely as you do it. Intake gasket, vacuum line fitting threads and where the lines attach like both ends of tranny line, pcv, charcoal canister, check dist adv., choke pull off diaphram, any extra 403 stuff. Try tightening the screws that hold the carb together also. Pull the spark plugs and see if one is darker like maybe sucking from underside of intake gasket.


C. Boyd
76 Crestmont
East Tennessee
 
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