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Can a vacuum leak cause spark knock? #1861513
07/01/15 08:57 PM
07/01/15 08:57 PM
Joined: Jun 2011
Posts: 19
Maine
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MaximRecoil Offline OP
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MaximRecoil  Offline OP
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Joined: Jun 2011
Posts: 19
Maine
Previously, I could never get the timing set right to eliminate spark knock. It would usually spark knock when going up hills at 45 MPH or so. It has always had a leaky power brake booster. Recently I replaced the booster which eliminated that leak, and now there is no spark knock. I was thinking that maybe the vacuum leak was preventing the distributor's vacuum advance from working correctly, but my friend said that if the vacuum advance wasn't working correctly, the timing would stay retarded, and retarded timing doesn't cause spark knock.

Re: Can a vacuum leak cause spark knock? [Re: MaximRecoil] #1861529
07/01/15 09:12 PM
07/01/15 09:12 PM
Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick Offline
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HemiRick  Offline
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Memphis
A vacuum leak would cause a cyl or 2 to run lean and running lean could cause the knock.


Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
Re: Can a vacuum leak cause spark knock? [Re: HemiRick] #1861679
07/01/15 11:34 PM
07/01/15 11:34 PM
Joined: Jan 2007
Posts: 7,664
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ahy Offline
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ahy  Offline
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Originally Posted By HemiRick
A vacuum leak would cause a cyl or 2 to run lean and running lean could cause the knock.


Agree!

Re: Can a vacuum leak cause spark knock? [Re: HemiRick] #1862076
07/02/15 03:21 PM
07/02/15 03:21 PM
Joined: Jan 2003
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dogdays Offline
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iagree

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