Hissing noise coming from exhaust and no acceleration
Asked by Jrhurt08 Aug 06, 2019 at 06:19 PM about the 2003 Chevrolet Trailblazer LT 4WD
Question type: Maintenance & Repair
I have a hissing noises coming from my exhaust
manifold area and when i try to accelerate the
vehicle tries to die and it wont go above 10 mph.
Any ideas what is causing the hissing and will
fixing get my vehicle back to normal?
4 Answers
Guessing that the catalytic converter is plugged up and you are hearing some exhaust gases escaping through a small leak.
What can i do to unclog it?
The most common hiss heard in that area on the I6 engine is on the plastic resonator on top, that says Vortec on it. Underneath it, is a curly hose, a lot of people forget to put it back on after removing it. There is also a PCV HOSE, no valve, on the drivers side intake, could be hissing if cracked or broken. Check the brake booster hose too.
You replace catalytic converters, not unclog them. A muffler shop can test the cat and replace it if needed.
