engine sounds muffled
#1
engine sounds muffled
I have a 2000 7.3 with 295000 miles. I have a 4" straight pipe DIY intake and a stiffer fpr spring (fuel pressure 65 psi). yesterday I started it up and the motor sounded different almost like it was muffled I started to drive it and it was a little sluggish once I got up to about 30mph it smoothed out and sounded normal. it did the same thing when started it up a few hrs later. any ideas on what that sounds like it could be? Not sure if it helps but 2 weeks ago my in line fuel pump went out pulled it off and bench tested it, and it didn't kick on. I took my air compressor and blew a bunch of black stuff out of it, bench tested it again and she kicked on so I put it back on and been driving ever since (still original in line fuel pump from Ford).
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