9-3 Viggen Detonation/knock

 
Old 08-12-2009, 05:58 AM
  #1  
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Default 9-3 Viggen Detonation/knock

Hey guys, i know, the title sounds scary. I don't think its as bad as it sounds. I'm restoring a viggen, just recently, under hard accelleration, it will loose power. It sounds very similar to a exhaust rattle, but thats not what it is. Its coming from the engine. Somthing is making it detonate. The M.I.L is off. I havent really started in depth diag, just sort of looking for a start point. it did have 1/4 tank of 87 in it, then i filled the rest with 93 octane (whats recommended) and wondering if that could cause it, but i highly doubt it. any ideas guys? I start my Diagnostics tomorrow.
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Old 08-12-2009, 08:35 AM
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Run it empty and refill with 93. Change the spark plugs. See if it happens again.
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