2005 Chevy Silverado Flutter when accelerating

Tiny
GRAYGHOST
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 40,000 MILES
I recently installed headers on my Silverado 5.3L. Around the same time, I also replaced my spark plugs and wires. I also installed a tuned chip. At first everything was great, I then started getting a fluttering noise after a couple of weeks. At first, I thought it was a gasket leak. I retorqued the header bolts to specs, and the collector bolts as well. I still have the noise. It only occurs when I'm accelerating, or the engine is under stress, going up a hill for example. Could this be a valve issue?
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Friday, January 4th, 2008 AT 12:17 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check for an excessive backpressure in the exhaust system-Catalytic Converter/Muffler/s.
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Friday, January 4th, 2008 AT 6:58 AM
Tiny
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Original question: Engine problem
2005 Chevy Silverado V8 Four Wheel Drive Automatic 40000 miles

I recently installed headers on my Silverado 5.3L. Around the same time, I also replaced my spark plugs and wires. I also installed a tuned chip. At first everything was great, I then started getting a fluttering noise after a couple of weeks. At first, I thought it was a gasket leak. I retorqued the header bolts to specs, and the collector bolts as well. I still have the noise. It only occurs when I'm accelerating, or the engine is under stress, going up a hill for example. Could this be a valve issue?

FOLLOW UP QUESTION:

Here is my set up. 5.3L engine, no EGR, no A.I.R, K&N FIPK cold air intake, Granatelli cold air tuned MAF, Doug Thorley headers, Magnaflow high flow catalytic converters, Magnaflow catback exhaust single in dual out. I wouldn't think I'm suffering from back pressure issues. I'll check the backpressure, but if that is good, is there something else that could be causing the issue?
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Thursday, January 10th, 2008 AT 9:04 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its hard to say what's causing it with all those modifications you've made. Could be just coming from the exhaust system.
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Thursday, January 10th, 2008 AT 4:47 PM
Tiny
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Is it possible that between the cold air intake and the performance exhaust that I've overwhelmed the stock valves ability to move air in and exhaust out. I'm thinking that I may need to upgrade the heads and cam. Any thoughts?

Thanks again
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Monday, January 14th, 2008 AT 8:08 AM

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