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Sometimes it knocks and sometimes it does not?

Old Dec 10, 2001 | 02:19 AM
  #1  
DANIELEK's Avatar
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Senior Member
 
Joined: Dec 2000
Posts: 550
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From: Alberta
Car: Red Rooster
Engine: 305 TPI
Transmission: M5
Sometimes it knocks and sometimes it does not?

I noticed for a few days now that my car sounds like it has knock problem. Sometimes it knocks and sometimes it does not.

I had the same gas in the tank with both situations.

Why would it knock sometimes and then it would not?

I have not touched anything in the primary /secondary ignition.

Can anybody suggest something?

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89Iroc, 305 TPI, WC T5, 3.08 Posi, Flowtech Headers, 3 inch over the axle, Flowmaster 80, Aluminium Driveshaft, Ported Plenum, Air Foil, K&N, AFPR, Smog/AC/Cat Delete, 3300lbs, All free mods
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Old Dec 11, 2001 | 03:26 PM
  #2  
arthur's Avatar
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Joined: Jan 2001
Posts: 95
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From: Vancouver, B.C. Canada
To properly diagnose the situation, what was the temp; of the air during detonation. What altitude were you at, where was your foot on the throttle? The temp of your engine etc.
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