Question about 2000 Chevrolet Blazer

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Hestiation Problem I have 2000 Chevy Blazer 4.3 V6 Vortec When it is first started it hesitates when i try to take off. It also does this when I am driving 40 miles per hour and then again at 70..mph If I go a bit fast like 45 or 75 i dont have the problem any suggestions on this? Also the rpm Gage kinda of sputter especially on the highway

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  • Chevrolet Master
  • 2,359 Answers

Carbon blocking the EGR movement and EGR passage tube.

====

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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Have egr valve checked

Posted on Sep 16, 2009

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  • Master
  • 811 Answers

Run scanner for trouble codes

Posted on Sep 13, 2009

  • chris quammen Sep 13, 2009

    run scanner for trouble codes

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