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Old 03-25-2020, 10:22 AM   #2
SCHMITTY
 
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
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Posts: 1,177
P pump 12 valve’s isles go up and down with the temp. Adding fuel will also change the idle characteristics. The injectors you installed probably have a different pop pressure and they may cause the differences your hearing also. These motors make a bit of noise regardless.

Who’s injectors ?
Can you hear the noise on video ?
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