Question about 2004 Chevrolet TrailBlazer

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I was in my sister's 2004 Chevy Trailblazer and it was acting up. First the service engine soon light has been on. I was driving and the engine started revving up and down then it stopped accelerating and wouldn't accelerate even if i tried. Then it was really hard to steer and was a little difficult to brake. I shut it off and then turned it back on and it stopped acting up. but this will happen every once in a while.

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The VVT (variable Valve Timing) solenoid may be dirty and will need to be cleaned or replaced. Poor maintenance (lack of oil change) will cause carbon and sludge to accumulate on the VVT screen causing the VVT to stick which will cause the issues your experiencing.
You may get lucky by trying to clean the VVT by adding a can of Seafoam to your engine oil and running it in there for the next 250 miles and then giving the Trailblazer oil and filter service with the recommended 5W-30 weight oil, anything heavier may cause the VVT not to function correctly as it is now.
Start with the simple and add Seafoam (Auto Zone, Part Source) carries the product. Service the engine oil after 250 miles, and at worst you may have to replace the VVT solenoid which is simple to do. Keep me posted if you have to replace the VVT.
Thank you for using fixya and be safe

Posted on May 13, 2010

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