07 f150 noise
10-28-2012, 07:59 PM
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07 f150 noise
Hi i have a question. Around50-55 mph when i get on the gas enough to make it downshift my truck makes a nasty popping noise from up front somewhere. The mechanic said it sounds like a backfire caused by a missfire. I hooked up my programmer and nothing came up but dtc code p0420 but its been doing that before that code came up. Any ideas?
