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High Octane

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Old Oct 6, 2010 | 08:44 PM
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Default High Octane
I have a 94 1500 5.2 and have to run high octane to keep the motor from ratteling. What would be a good solution or is there one?
 
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Old Oct 6, 2010 | 08:47 PM
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do a tune up
 
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Old Oct 6, 2010 | 08:54 PM
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Done that. I've had the truck for 6 yrs. always been this way.
 
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Old Oct 6, 2010 | 08:55 PM
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Figure out why! Are you having to add oil between changes? Do you maybe have a vacuum leak? Is it overheating, or getting close to it?

Need. Input.
 
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Old Oct 6, 2010 | 09:00 PM
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fix the leaking plenum and replace the timing chain (and water pump while you are there).
 
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Old Oct 6, 2010 | 09:04 PM
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Originally Posted by UnregisteredUser
Figure out why! Are you having to add oil between changes? Do you maybe have a vacuum leak? Is it overheating, or getting close to it?

Need. Input.
I do add oil, but it has 251,000 on it. Pretty sure no vaccum leak, temp is fine.
 
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Old Oct 6, 2010 | 09:05 PM
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Originally Posted by dhvaughan
fix the leaking plenum and replace the timing chain (and water pump while you are there).
All of the above have been done.
 
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Old Oct 6, 2010 | 09:12 PM
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Seafoam it and remove the carbon build up, completely eliminated the pinging in a friend's Ranger...
 
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Old Oct 6, 2010 | 09:16 PM
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you may have a cracked head ? these motors are known for that also
 
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Old Oct 7, 2010 | 01:33 AM
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Have you ever changed the oxygen sensor? How long ago did you "fix" the plenum, and did you just change the gasket or did you perform the Hughes or APS type fix?
 
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