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Pinging W/tune And 91

 
  #1  
Old 03-03-2007, 06:13 AM
BSHORT
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Pinging W/tune And 91

After a recent smog, I reinstalled the diablo tune back into my 01' f150 screw 4x4 w/5.4L. I have used 91 Shell for as long as I've had the pred. I decided to go out in the country and floor it, just to see if it was as good a I remembered. I noticed that there was pinging at wot just before each upshift. I had never noticed that before, But I probably had the stereo on and could never hear it. Diablo recommends a 10% retard, it was done, and still pings. (although not as hard) If I go another 5%, then I will be at their settings for 87 octane. Diablo told me that I could have an ignition problem of fuel filter issue. This is not the case! I am not a tuner, nor do I have access to a dyno. I do not want to piddle with air/fuel changes over and over. Any suggestions before I sell it to somebody else and get a custom tune from Troyer?????
 
  #2  
Old 03-03-2007, 02:49 PM
Fred03Explorer
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Sounds to me like you either have to increase the octane level or retard the timing enough to stop the spark knock.
 
  #3  
Old 03-03-2007, 11:38 PM
pronstar
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How old are your plugs?
Have you cleaned your EGR ports?

These two things (plus replacing a faulty DPFE) got rid of a ping that I had.
 
  #4  
Old 03-03-2007, 11:49 PM
BSHORT
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Plugs have 70K and egr ports are clear. What do you think about retarding the timing 10% and lowering the a/f ratio (richer) in the 4-7K range by a point or two? It make sense since all these canned tunes do is up spark advance and lean out...Your thoughts?
 

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