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2000 Chevy Blazer buck-hesitation

Tiny
GHAYES
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
My blazer will buck occasionally when i'm just driving along. I've replaced the cam shaft sensor and the manifold pressure sensor. I still have to replace the mass air flow sensor. I can't find a vacum leak any where. My question is can this bucking be caused by the air flow sensor or am I probably looking at a transmission problem.
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Thursday, June 11th, 2009 AT 1:21 AM

1 Reply

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
We have a similiar one in the shop that we are trying to get through. Trying to nail down the cause hasn't been easy. We are suspecting a problem in the fuel injection system. The poppets tend to clog up. The fix is to first try to run a GM top engine cleaner through. IF it improves but not eough, then the injection system needs top be converted over.

The GM cleaner is a 20 OZ bottle and runs around $26.00. You add it when it when tank is about down to a gallon and and half or so. The tsb says a 10% top engine cleaner to 90% gas. The GM dealer will know which one, The one in our area stocks 150 bottles.

IF there are no codes, this is where I would go with this.
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Thursday, June 11th, 2009 AT 5:02 AM

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