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Discussion Starter · #1 ·
I realize that this is not an issue for my Bullitt, but I figured that somebody here might be able to help. I have a '98 Expedition and I recently put on a 3 chamber flowmaster exhaust and a K&N airfilter. Lately the weather has been colder and it has started to ping horribly. Even if the vehicle is warm, if the air is cold, it pings. One particulary cold morning I noticed that it pinged on almost every acceleration, but later in the day as it got warmer the pinging stopped. That night when I drove it home it was pinging again. What do I do? I took it to a dealer and they ran diagnostics, but to no avail. Any help?
 

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Did it do this last winter? If it just started pinging after the flowmaster and K&N, run a higher octane gas and see if that helps.
 

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Discussion Starter · #4 ·
'01 Hoofbeat: I don't know. I just bought it about 4 months ago.
 

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Discussion Starter · #5 ·
Well, I finally broke down and put premium in it and is stopped pinging. Kinda sucks though, 15 miles per gallon and still wants the expensive stuff.
 
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