1989 LX Mustang Motor Whistle

sblutes · 4 Weeks Ago

Hi,Glad too find this site.I have a 347 stroker that makes a whistleing noise at idle.The noise is around my trick flow plenum it has an upper and lower trick flow with a 70mm bbk throttle body and spacer.I have been told it may be that the plenum gasket had been sucked into the motor my upper 2 plenum bolts were lose at one time.

**RLG34750** · 4 Weeks Ago

i bet money its the the throttle body.....

BBK's are notorious for the whistle

sblutes · 4 Weeks Ago

Hi,Have a whistleing noise around upper plenum area.I have a Trick Flow Upper and Lower Plenum with a 70 mm BBK throttle body and spacer.Engine rebuiders thought it may be a vaccum leak but were enable to find one.It is a really loud and embarrasing whistsle please help me out here.

Thank You

7-UP BILL · 4 Weeks Ago

My friend had that noise when he replaced is intake. It ended up being the wrong intake gasket. It's been awhile since it happened, but I think he replaced it with a 351 emissions gasket. His whistle came out of the intake bolt holes. You also omit the front and rear end gaskets and use silicone

**EagleAutosports** · 4 Weeks Ago

Could be the throttle body, could be a gasket, could be a vacuum hose.

foxhtn · 4 Weeks Ago

This thread might help you out also.

BBK Throttle body whine/ high pitched noise fix - Ford Mustang Forums

86Lx · 4 Weeks Ago

If its not the t/b then its a mystery, I have the same exact problem. I have a trickflow topend with bbk t/b and ive changed gaskets and had four different people check my vac lines. What puzzles me is that the noise goes away at idle between 1-2k but below 1k it starts. It might be making it at higher idle but I cant tell with my exhaust.