96 Dodge Ram Screeching Rattle

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Old 07-25-13, 06:47 AM
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96 Dodge Ram Screeching Rattle

Hello,

I have a 1996 Dodge Ram 1500 with the 360 engine. Lately when I start the truck I hear a tinny, rattling screech from under the truck. It sounds like it's right under the doors, not at the front of the engine.

I checked all pulleys and replaced the serpentine belt (needed it anyway).

This screeching rattle gets worse when I give it gas or put torque on the engine.

Funny thing is, when it warms up a bit the noise goes away.

Can anyone give me some advice as to what this may be?

About 3 years ago I had the exhaust system replaced starting with the catalytic converter all the way back. I seem to remember a noise from the converter but don't remember if the noise was the same.

Any help is appreciated.

Thanks

Tripper
 
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Old 07-25-13, 06:51 AM
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I would suggest have someone start the truck while you're under looking for the source.
Without pin pointing the exact location, I would have to take a guess at maybe a heat shield or a clamp on the exhaust is a bit loose.

I'm assuming this is mostly when the truck is not moving?
 
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Old 07-25-13, 08:49 AM
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Hi Mike,

It happens both when the truck is sitting still and moving. When I first start moving, if I baby the throttle it will not happen or not that noticeable. If I give it gas the noise gets much worse.

Then about a mile down the road the noise disappears.....

Trip
 
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Old 07-25-13, 09:02 AM
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The heat shield on my wife's old neon was similar. Most of the mounting holes/bolts had rusted out or loose. One of the key bolt holes was loose enough to rattle, but tight enough that a bit of eat expansion would make it stop.

When you are moving, does the sound increase in volume or pitch with engine speed or wheel speed?
 
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Old 07-25-13, 10:48 AM
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Not so much wheel speed but with more gas it is in step with the revving of the engine.
 
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Old 07-25-13, 11:04 AM
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Could be a heat shield.
I'd try spotting the location with the help of a friend. Might target the exact trouble spot or at minimum, isolate the area. Inside the cabin can make it hard to actually pin down the source of noise outside.
 
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Old 07-25-13, 03:06 PM
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I have a similar sound on my 2001 Ram 3500 Cummins. Heater core was dripping so since it is July, I just looped in a bypass until winter. My screeching is coming from the heater/cooling fan area. If I turn the unit OFF, it stops, so I am gathering mine is the fan tinging on something.
 
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Old 07-27-13, 09:52 AM
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Fixed...!!!

It was the heat shield on the catalytic converter.

I put a couple of big worm clamps around it and the rattle is gone....YES!

Thanks to all who replied. Very appreciated.

Trip
 
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Old 07-27-13, 11:06 AM
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Glad you got it fixed, and super glad you didn't have to pull the heater mechanism. My mechanic told me to leave it for a full day for him to pull it all out. AC refrigerant has to be recovered, etc. 8 hrs at $59 per.......I'm saving up for the first cool snap.
 
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Old 07-27-13, 11:41 AM
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Sounds like my Dakota back in VA Larry. Spent a (mild) winter with no heat because of cost. $500 labor to replace a $90 faulty heater core.
 
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