Pinging/Rattling Sound

[earleys94gt]

My car, a 94 GT, makes this noise at part throttle that sounds like a pinging/metalic rattling noise. I recently discovered that my BBk x-pipe to air tube hose was leaking, b/c BBk gives you a rubber hose that melted, so I cut down some of the tube an replaced with "heavier" duty rubber hose.
I then noticed, by using a length of hose held up to my ear, that my EGR to header tube was leaking, so I used some Loc-Tite on the threads. However, both still leak. I was wondering, would these to problems make a pinging/metalic rattle sound and barely any or part throttle??? Even if I push the gas down 1/32 of an inch while driving the sound is made, or if it's at quarter or half throttle. I do not notive the noise at idle(in the garage), or in park or neutral, only while driving down the road...Any idea's..????

 

[Don 95Vert]

Probably - the air leak in the TB tube would lean it out some, probably enough to cause it. Plus with the EGR tube leaking, you are letting extra oxygen in the system rather than inert exhaust gases. Fix all that and you should be OK.

Ashley huh? We are in Delaware!!

Don

 

[Methodical]

Also check your header bolts to make sure they are not loose

 

[earleys94gt]

I was out last night driving it around, and anytime I go by a sound wall or a another car you can hear the sound clearly, and it sounds like it is coming from underneath the car! I don't think it's my cats, but I do know the air tube connects down there too. The sound also sounds like it is coming from boith sides of the car/engine bay...The sounds annoying b/c all you hear is this rattle noise versus my exhaust...lol

 

[HISSIN50]

Dont forget to check your smog pump (if applicable) - I've had a few of them get noisy (because of bearing wear, the vanes start hitting one side of the casing and it makes some nasty noises).

Good luck.

 

[reddy351]

I'm in Columbus!!! Anyone from Grove City? We'll make a chain going South. LOL I have a little pinging under heavy load. I did the PCV valve. Idles smoother. Fuel filter. (What a joy to do!) Still rattles. I'm gonna keep on looking...

 

[Methodical]

I was out last night driving it around, and anytime I go by a sound wall or a another car you can hear the sound clearly, and it sounds like it is coming from underneath the car! I don't think it's my cats, but I do know the air tube connects down there too. The sound also sounds like it is coming from boith sides of the car/engine bay...The sounds annoying b/c all you hear is this rattle noise versus my exhaust...lol

I used to have that rattling underneath also, which was that metal air tube going to the H-pipe. I removed the metal tube and now use a rubber hose. Lay down on the passenger side of the car and see if you can hear the rattling while idling.