hearing knock retard that comes and goes?

[TinasSHO]

hey all,
I have a 2013 55k non pp sho. I'm hearing a "fluttering type, knock " sound that comes and goes and is most noticeable under normal acceleration, is it KR I'm hearing? I have quickly taped up the KR wires with electrical tape as best I could givin the time I had, seemed to help tone it down some but still comes and goes. this is drivin me nuts because sometimes its almost embarrassing when I have pe0ple with me. I am putting in new plugs this weekend and gonna try and check all the connections and CAC also . will wore sparkplugs cause this? .....I test drove a few of these before purchasing and noticed they all did it in some way shape or form. any advice or links most appreciated. thanks jack

 

[krewat]

I think I've heard the same thing in my 2013, and my 2016. Under light acceleration, I can hear a "flutter".

Brings to mind a lot of back-and-forth on ford-trucks.com about the Ford 6.8L V10 engine back when it first came out with PI heads in 2000. Exhaust "flutter" was driving people nuts - it was a resonance in the exhaust that happened, actually, around the same points where I hear it in the SHO. The solution that Ford came up with was a necked-down Y-pipe that changed the spacing of the exhaust pulses without any real degradation in WOT power (but it did mess with throttle response at low RPMS).

Interested to hear stories from other people who've noticed this "flutter" in the 3.5L EB and maybe one of them put in new downpipes and it got better (or worse)?

 

[TinasSHO]

I hear ya , just hard to believe these engines can be that noisey at times lol. I had to install a new battery today and now im hearing what sounds like a vac leak , seems to be from the plastic .500 diameter line running cross the just in front of the cowl/firewall . I need an sho ecpert in my tn. Area to check it out maybe. Lol

 

[glockcoma]

I hear ya , just hard to believe these engines can be that noisey at times lol. I had to install a new battery today and now im hearing what sounds like a vac leak , seems to be from the plastic .500 diameter line running cross the just in front of the cowl/firewall . I need an sho ecpert in my tn. Area to check it out maybe. Lol

That sound is probably coming from the brake booster check valve. It's completely normal.
Circled in white

 

[TinasSHO]

Hmmmm maybe, look at the very top of your pic, that tube runnin horzontal is where im hearin it with a small tube in my ear, two little tabs holdin it to the top of firewall. I can hear this with hood open standin ten feet away lol

 

[RamAireTransAm]

where are the knock sensor wires ? I want to take a look at mine

 

[TinasSHO]

there is a post on here that shows and explains. standing in front of vehicle on right side of engine in center under intake. under the large black plastic tube that's between battery and engine. 2 sets of black n white wires in 1 plug . they rub on engine and chaff, ive heard that they don't have to be chaffed u can possibly get interference from them touching a ground source.

 

[glockcoma]

where are the knock sensor wires ? I want to take a look at mine

Almost directly below where the upper
Radiator hose goes into the thermostat housing.

 

[glockcoma]