what to do about these noises?

SzybkiStang

New Member
Nov 5, 2006
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Well this past week my car (a supercharged 96 gt) has decided to make every noise possible. It was running fine and all of a sudden one noise after another decides to show up. The first is this annoying ticking sound. It sounds like it is coming from behind the radio console. It doesn't make this noise when idling, only when the car is in motion while my foot is on the gas. If I take my foot off the gas it goes away. It is not terribly loud, just really annoying. I have been told by one person that this is from the fuel injectors, another said it was an exhaust leak, and another said it could be a bad spark plug. What do you think it is and how could I find out what it is without taking it to the shop? As you can tell I am not the most mechanically inclined person yet (but I am learning) or I would have already figured out what this is.
The second noise sounds like a trombone. It occurs when I start the car. It is pretty loud. If I hit the gas it will go away for a moment, and then come back. Once the car is in motion it doesn't make this sound. It doesn't always make this sound, but when it does it is a bit disturbing because it is so loud. Any thoughts on what this could be? There are a handful of other noises, but they aren't too serious. Thanks for any help.
 
The trombone sound sounds like a bad engine mount. With the miles and age I'm betting that is your problem.

The first sound could be detonation. It sounds like marbles rattling in a can when you accelerate. What octane are you running in the car? Since you are supercharged you should only be running 93. Describe it a little further. Does it increase in speed with RPM's? Can you hear it from the engine compartment? Try to locate it from there.
 
As far as the mileage goes, it has yet to see 30,000 miles, so I don't know if that is the problem.

As for the ticking sound, I am not sure how to exactly locate it since it only ticks under load. I tried revving it in neutral but it doesn't make the noise then. It gets nothing but the highest octane available. I had to get gas from a different station this last time that was only 92. I am hoping I just got a bad batch of gas and that this was the cause and when I fill it up this week with the good stuff it will go away. The noise is a constant uniform tick, it doesn't speed up or slow down with the rpms or speed. All I know is that it drives me nuts.
 
Even with only 30K miles the engine mounts will degrade. Man that is low miles on a 96. Mine has 166K.

SO you noticed the tick after the last fill-up? Try adding some octane boost or drive a little to make some room for about 3-4 gallons and then add from a different station.
 
It might be an exhaust leak. Run some seafoam through the crank/gas tank/pcv and look for any bubbles or seafoam leaking. You can check around the plenum, exhaust mani/head, exhaust mani/H pipe, etc.