I have a 97 F150, 2wd, 4.6, auto bought for a great price agout 3 months ago....

I installed a cold air intake (air raid) and a throttle body spacer with the swirling cuts.

since the cold air intake add, the truck occasionally makes a load "roaring" sound from the intake system. at same time rpms increase 500-1000 rpms...
it doesnt do it all the time, mostly at low throttle, and a quick jab on the accelerator usually stops it. sometimes such as when parking, holding the brake and appling a bit of throttle with load from the brake will also stop it.

guys at local garage seem to think it has something to do with lower outside temps, (denser) and addition of cold air intake. it made the noise before the throttle body spacer.

wife says it sounds like a sick fog horn (LOL not)

anybody else experiance this?
any ideas and advise appreciated

mike

 

It's mostly your TB spacer. The intake does allow some noise, but is the spacer that is causing the trouble.

IMO, I'd take that spacer and load it into a clay pigeon thrower.

 

Hey man i what u mean it sounds like sick fog horn my 97 five 150 with afterm arket intake does the same thing but it seems like it is only in the winter it went to shop today for cylinder misfire code i couldnt fix. I told the tech and he heard the noise he seemed to think there is some kind of valve in there that gets stuck open sorry thats all i know but it drives me crazy just giver it a little gas and it stops especially when its in drive and at stop light??? If you figure it out first let me know?

 

I have the airraid intake and TB spacer. I get that whistling/roaring sound but only when I really hit the gas. It doesn't get very cold down here, but I doubt that just the cold air will cause this. I would check your intake clamps and TB gaskets/bolts make sure you don't have a leak somewhere.

 

Did anybody ever figure out the resolution on this problem?