I have a 2000 civic ex with a d16y8. Around 1500-2200 rpms I get this whistle noise coming from the engine bay at about half throttle. When I turn the heater on it will do it at idle even. I've searched most people said its because of the short ram intake but I put the stock one back on and it still did it others say it's from the idle adjustment screw and it needs tightened I messed with that and nothing. Anyone have any suggestions?

Thank you if you do

 

Do you have an exhaust leak? big aftermarket air filter?

 

Possibly large vacuum leak...

 

^ that too

 

Normal air filter cone...only makes that noise through those rpms and goes away shouldn't be the exhaust leak I just inspected that possibly a vaccum leak ill check there

 

can you post a vid vacum leak is a possabilty what does you'r idle sit at ?

 

When warm I'm about 800-900 can get. Vid tomorrow and it will only do it when it's in gear or when the heater is on

 

Bumpy

 

bump

 

Normal air filter is not a cone...

 

on a sri? its a spectre filter like what you but at autozone or whatever the filter that usually comes with a ram intake, but its not the intake because i put the stock one back on and it still has the whistle noise.

 

That will cause a whistling noise


So you put the stock intake on (with the panel filter) and it still made the noise?

Can't you just see where it's coming from by opening the throttle body manually...?

 

If this is true, its obviously not the intake...

 

it will only do it when its in gear so i would need someone to be inside with there foot on the brake but ill try more when i get off work. i just dont understand why it would come on at idle when the heater is on. idk what it is but its bothering me i do a little more work when i get home and let you guys know

 

make a video

 

Automatic or manual trans?

 

auto

 

will do be off in about 2 hours

 

Does it make the noise in neutral?

 

nope just in drive

 

only time it will do it in neutra/park is when the heater is turned on

 

Does the car have A/C?


And which setting do you have the climate controls on with the heater ON?

 

Check brake booster(round can between firewall and master cylinder) in gear drops revs more. Where is idle at in gear. Is brake pedal kind of "spongy" at all??

 

It has ac yes...and not sure where it idles in gear ill look but brakes feel fine

 

While idling, spray ether(edit: aka starting fluid) behind/around booster. If it idles up there's your prob. Look for leakage of brake fluid between master cyl/booster. Fluid can get in there and eat up rubber seal, causing vac leak