Exhaust is not coming out of pipe as it should, loss of power, truck is quieter than usual and hisses when accelerating. help?
The day before this started , the
truck was misfiring and there was a
small exhaust leak coming from the
manifold at idle. The rpm's surge
while idling like it's not breathing as it
should. When idling the hissing is not
detectable unless one gets down
and listens by the rear tires. So all in
all, something is not letting exhaust
escape where it should if at all. What
could cause this?
Most likely a clogged catalytic converter. But check the rest of the exhaust system for damage such as dented or crushed pipes or muffler. The catalytic converter has a honeycomb type "brick" inside that can become clogged. Since your truck is 21 years old this is a real possibility. If the truck has been misfiring, burning oil, or leaking coolant internally the converter is most definitely clogged. HTH. -Jim
Perfect. That's exactly what it was. Honeycombs were all broken up and clogged the pipe. Thankyou!
You're welcome. Glad to help. Thank you for the best answer click! -Jim
Looking for a Used Sierra 1500 in your area?
CarGurus has 67,775 nationwide Sierra 1500 listings starting at $2,484.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts
Related Models For Sale
Used Cars For Sale