6.2l whistle

[Andy2675]

Does anyone have a whistle when in the throttle in the 1600-2000 rpm range? (No, obviously not a S/C) It's got to be a throttle body/intake deal. It goes away as soon as you lift so not a pulley bearing I would assume. It's a little better when at full temp, but when cold, it's really audible. Doesn't seem to effect anything, no cel, 15.5mpg average just really annoying. Any ideas?

 

[MurderedOutSVT]

Gonna need a vid or recording of that. I can only hear blower whine but have never heard anyone speak of a whistle. My 98 had a whistle but is was a t-body spacer

 

[Andy2675]

Gonna need a vid or recording of that. I can only hear blower whine but have never heard anyone speak of a whistle. My 98 had a whistle but is was a t-body spacer

I'll see if I can get the video to pick it up. Windows down you can hear it clear as day in the first 15 mins of driving but obviously wind noise would be too much on a video.

 

[W0n70n]

If you let it idle and spray brake clean near the intake joints, not the filter, the engine will surge if it's pulling in air from after the inlet. The resonator etc could be leaking and whistling.

 

[MurderedOutSVT]

If you need help, i'm not too far away

 

[Andy2675]

If you need help, i'm not too far away

Thanks man, I'm just fishing around for a place to start if anyone had a similar problem.

 

[MurderedOutSVT]

Yeah bud, never heard of a whistle thing. I'd look all over the intake hoses and areas. Its sucking air (giggity) from somewhere that aint right

Mayeb @Old-Raptor-guy or @FordTechOne might have some insight

 

[Old-Raptor-guy]

The brake clean/carb cleaner trick doesn't work anymore. The computers are so fast at compensating/adjusting fuel. Also computer, is extremely sensitive to air leaks and would flag a check engine light.

My bet would be a leak in the exhaust, most likely the at the manifold and cylinder head.

See it alot on almost every engine made. Exhaust manifold warps a little and at the right Exhaust flow it whistles.

When the manifold heats up, the expansion causes the manifold to seal back up to the cylinder head. See it almost weekly.

 

[Andy2675]

The brake clean/carb cleaner trick doesn't work anymore. The computers are so fast at compensating/adjusting fuel. Also computer, is extremely sensitive to air leaks and would flag a check engine light.

My bet would be a leak in the exhaust, most likely the at the manifold and cylinder head.

See it alot on almost every engine made. Exhaust manifold warps a little and at the right Exhaust flow it whistles.

When the manifold heats up, the expansion causes the manifold to seal back up to the cylinder head. See it almost weekly.

I suspected there would be a CEL if AFR were being affected from unmetered air but I wasn't sure how sensitive it is. Maybe just some long tube headers will solve the issue then lol

 

[Old-Raptor-guy]

Get underneath the truck and look at the rear couple of bolts, holding manifold to head. Bet a dollar you have at least 1 broken/missing one.