Question about Dodge Ram 1500

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My 2003 dodge truck makes a rattling noise at 1400 rpms and lower than 30 mph. I've looked at the heat sheilds and tapped on the exhaust to try and recreate the sound but cannot. it is really hard to determine where the sound is coming from. it happens when increasing to 1400. rpmsand I can make the noise while holding at 1400rpms while in drive never in park or neutral.

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  • sluna5555 May 03, 2010

    I think your first thought is right. I looked at the catalytic converter and tried to see if any welds were broken which they didn't apperar to be. I used hose clamps to tighten them anyway but I still hear the sound. I will take to a mechanic to replace the converter. Thanks for your input doug bender I appreciate it.

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Sounds like a bad cat. converter. it could have some pieces of it rattling around anywere between cat and muffler.
also i have a ford ranger that did the same thing and i could not make the noise happen by banging etc i pulled my hair out because it was a short lived but loud noise at about 1500 rpm. finally i got some bailing wire and wrapped the heat shields with it one at a time.test drove and the noise did not vanish but it was greatly reduced. sure enough the heat shield on top of the cat had a spot weld that broke. took it to midas and had weld it up for me.

Posted on Apr 24, 2010

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  • dougbender51 May 04, 2010

    your welcome

  • sluna5555 May 14, 2010

    I took my truck to MIDAS and they told me my catalytic converter was good and they weren't able to recreate the noise even after I told them how. I will check the heat shields again but I just hope it isn't anything too serious..If you have any other suggestions I would appreciate it.

  • dougbender51 May 14, 2010

    its gotta be a heat shield or something like that. i wouldnt trip on it much. i dought its anything serious

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