Name that noise.....

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doomdead

New member
I have a slight fluttering sound coming from around the center of the firewall. Kinda like a ziptie clicking against spokes on a bike. I can only hear it while im driving.

I dont think its exhaust, I've checked all my bolts, I did have an exhaust leak a few weeks ago, but thats fixed. And not in the same area as this sound.


These are the conditions it exists.

I must be under vacume
I must be moving more than 5-10mph
Around 25-40mph it goes away when i press on the brake
Around 60mph it gets louder when I press the brake
Its loudest/fastest around -20 -10 vac. (sometimes it goes away at -20, sometimes it doesnt)
It's not always there.
Putting the truck in neutral doesnt make a difference.

Sounds like vacume leak? Where do I look?

I dont have a bike tire and an air compressor on hand. I already thought of that. Of course, that checks for pressure not vacume right? Those check valves would mess that up....
 
Mad Mike

Mad Mike

SYCOSIS
Propshaft? Sounds there only when moving. Relative to speed? Remove the propshaft and see if it goes away.
 
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doomdead

New member
Yes I'll be at the hot rod run with the ty... It very likely could be the propshaft, I belive its causing bad vibration > 80mph... I'll try and check to make sure all the bolts are tight on monday.

I checked the brake booster its fine...

The sound does seem to come from the lower area of the firewall.... I'll be driving the truck awhile today I'll try and make some notes about it.

But like i said if i gas it to 0 psi, it goes away. To me that would be vac related, not pressure or hardware. So I was leaning towards where to check first... I'll pull the hvac and try and block it off.

Thanks.

By the way, odiwik, you said again this year, did i run into you last year or did you just see me? Wanna meet up?
 
X

Xplicit Racing Design

New member
my truck had a similar issue, it was the fuel lines rubbing against the inside of the firewall./transmission tunnel and made a slight pulsing noise, mine would only do it with someone else in the truck


John S
 
O

odium

1BADGMC
I saw your truck. It's hard to forget a Typhoon that is yellow with purple flames driving through downtown. I never met up with you though, that place is too crazy to find other people. 7/8 the people there probably thought you were some punk kid in a wack blazer, lol...

Of course I would like to meet up. I'll have my Forest Green Ty there this year. I'll PM you my address and cell/home numbers. I'll show up extremely late on Friday, I'll be there all day Saturday, and I'm leaving late Sunday. I live down there, so I have a party house. :D

If you have datamaster, please bring it... Also, bring your friends.
 
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