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Octane Boost

Old Jan 18, 2006 | 07:42 PM
  #1  
zman764's Avatar
zman764
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Laughing Gas
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Octane Boost

I have a spark knockin
97 4.6 4x4 w/ 189k miles.
Its not the brand of gas
its not the plugs
its not the air filter

I was woundering what ya'll thought about trying some octane boost before trying 89 or 93 octane gasoline?
 
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Old Jan 18, 2006 | 08:39 PM
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fuel filter pluggage, & check timing. does it only happen under throttle, or steady load at 2000 RPM?
 
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Old Jan 18, 2006 | 09:00 PM
  #3  
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zman764
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Laughing Gas
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It has been knockin before i had the fuel filter replaced last year, and after

timing is computer controlled you can't mess with it i believe

it always does it under hard throttle ( 3750 rpms on up)

it sometimes does it cruisin on the interstate at 1800-2100 rpms (60-73 mph) (usual cruisin speed)

Its been a while since ive towed the 17' center console boat(my dad usually towes that) i dont remember how it reacted then
The spark knock is not any different when i towe my jet ski.
 
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Old Jan 18, 2006 | 09:03 PM
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Have you ever cleaned the MAF sensor?
 
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Old Jan 18, 2006 | 09:13 PM
  #5  
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zman764
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Laughing Gas
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If the MAF is the sensor imbetween the air filter and Throttle body, it is perfectly clean and looks brand new.
 
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