Question about 2009 Chevrolet TrailBlazer

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Exhaust system issue or something else?

I started my trailblazer and it sounds like a harley...for about 5 minutes, then it sounds like it always does. It is almost like something heats up and seals a hole or gap and the sound goes away. When I start it when it is cold or has sat for a while between trips it sounds like this but the sound gores back to normal after driving for only a few minutes. This started last Thursday morning and has changed very little over the last 5 days. Any ideas? I would like to take it to the shop with some ideas rather than walk in blind and get taken for the big $$$$. Any ideas or suggestions will be most appreciated. Thanks!

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  • 171 Answers

Try checking the temperature sensor, the one for the computer, also it may be the injector tubes under the intake they often crack and leak fuel under the intake manifold.

Posted on Jun 24, 2013

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Posted on Jan 02, 2017

tripletauto
  • 1450 Answers

SOURCE: Engine noise cold

these motors made some noise when cold normally due to the clearance. Is it more than that? Have you tried removing plugs and soaking pistons overnight with topengine cleaner this will loosen carbon which makes some cold noise problems.

Posted on Aug 26, 2008

tripletauto
  • 1450 Answers

SOURCE: 2004 silverado

THIS IS NORMAL noise for your truck. carbon buildup on pistons causes a cold start knock until warms up. you can run some top engine cleaner thru engine to help. but noise is nothing to affect life of engine

Posted on Oct 20, 2008

  • 3 Answers

SOURCE: engine has a miss at idle exspecially in the morning

need to pull plugs and crank over in morning and see if water blows out of any plug holes. Sounds like water in cyclender.

Posted on Dec 22, 2008

  • 4 Answers

SOURCE: Problem with No Heat on 2005 Chevy Avalanche - Cooling System?

it is most likey a sticking thermostat it either gets stuck closed or open in your case closed so collant isnt getting to the heater core and all you get is cold air blowing into the truck.
its a simple fix you can either do it your self or take it to a mechanic. now remember there are differnt thermostes so think about the climat you live in and get one according to that

Posted on Jan 29, 2009

  • 131 Answers

SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....

try replacing your EGR Valve, or your Oxygen Sensor

Posted on Feb 10, 2009

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