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Exhaust Rattle

John01LS

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John01LS Enthusiast

John01LS

Posted
Posted

Ok so i've had this annoying rattle for a couple of months now. It happens right when you start to accelerate, at around 1000-2000 rpms. It is a rattle that sounds like some sort of heat shield, but to my suprise it was not.

 

I started hittin my fist around the bottom of the truck and the rattle is at the O2 sensor i believe. right after the catalytic converter on the driver side of the truck.

 

I hit on the same spot on the passenger side of the truck, and no sound. so it is that driver side and it is at that sensor. When i hold the sensor, the sound does not go away but it makes a different pitch sound. So i do know it is that sensor.

 

Has anyone had this problem before? I need help it is annoying the crap outta me! I know u guys feel me on this, its the little things! :flag:

 

Thanks!

trever1t Enthusiast

trever1t

Posted
Posted

I had a similar problem on a previous GM vehicle. The rattle annoyed the hell out of me! Sounded bad!

My dealorship just welded the exhaust and no more problem!

willieboy Enthusiast

willieboy

Posted
Posted
replace it and if its under 80000Km its warranty as it is an emission item.

 

 

 

 

I think it is 80,000 miles in the US. So, go by your dealer and ask them if it is covered.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Believe it or not, the federally mandated emission warranty is 2 years, 24,000 miles, except for the PCM and the catalytic converter, which is 8 years, 80,000 miles. You'll have to do your own kilometer conversion.

 

Since the vehicle has a bumper to bumper warranty, that covers emission items for 3/36, even though legally, GM is only required to cover them for 2/24.

 

This change came about in 1995. Prior to that, the emission warranty was 5/50, but there was no extra time/mileage for the PCM/catalytic. I assume the 8/80 on the PCM and catalytic converter starting in '95 was a trade of for a reduction of the regular emission warranty time and miles.

 

The above applies to federal emissions. This may differ in California or states that go by the California emission standards (New York?).

  • 6 months later...
msm20032003 Enthusiast

msm20032003

Posted
Posted

My dealer thinks it is the catalytic converter. They ordered a new one and it is covered under the Emissions warranty. If this doesnt fix it I will have them check the O2 sensors.

  • 2 weeks later...
msm20032003 Enthusiast

msm20032003

Posted
Posted

They replaced the catalytic converter....no help. I figured they would have checked to O2 sensors since I told them to, but whether they did or not I do not know. The catalytic converter was free. They billed GM $545 which seemed kind of high....glad I didn't have to pay it. I am really getting sick of this problem. It's been to 2 different dealers and neither can find a fix. The tech did say he thought it could be the transmission...but I think its an exhaust problem. If the transmission went bad I'd just say keep the truck, and leave. It seems like several people have had a similar problem but their fixes were simple things like heat shields and O2 sensors. I got under the truck and hit around on the exhaust and got no noises and there was nothing loose....I don't know what to do. Taking it to dealers doesnt help anything and it costs me money, and I can't find the problem. Any ideas?

soccermom Enthusiast

soccermom

Posted
Posted

My truck had a similar sounding problem that replacing the muffler fixed. I think a baffle broke loose b/c it wasn't the heat shield as far as I could tell.

msm20032003 Enthusiast

msm20032003

Posted
Posted
My truck had a similar sounding problem that replacing the muffler fixed. I think a baffle broke loose b/c it wasn't the heat shield as far as I could tell.

 

 

 

I have already replaced the muffler :cool: ....I forgot to mention that...but thanks for the help. I got reading around and someone said that the sound was their catalytic converter....which I replaced and someone else said the exhaust needed welded.

pm26 Senior Enthusiast

pm26

Posted
Posted

Try removing the heat shield (one at a time if there is more than one) and see if that does anything.

msm20032003 Enthusiast

msm20032003

Posted
Posted

I did find a small exhaust leak one time but when I took it to an exhaust shop they said It is normal.... I don't know about that....I will mess around with the heat shield thing tomorrow. Also, Where are all the O2 sensors?

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