Question about 2002 Chevrolet Blazer

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My 2002 chevy blazer cuts out or bucks at highway speeds

Why does my 2002 chevy blazer cuts out or buck at highway speeds?

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  • 167 Answers

Is there any check engine lights on? also a leak in the vacuum lines will make it jump in and out of over drive. could be a few problems. wish i could help more, sorry. if you have a vacuum leak it would also make you heater controls not work like they should, like if you put it on defrost it will only come out the vents and so on.

Posted on Jun 13, 2014


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Posted on Jan 02, 2017

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SOURCE: 2000 silverado 4.3 5 speed truck bucks at part

sounds like it is in the throttle sensor or idle control valve causing problem not responding fast enough to take over also try the fuel filter could be clogged.

Posted on Aug 30, 2009

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SOURCE: I have a 1999 chevy blazer with 124000miles that

the best way is to have the radiator gases analyzed this will tell you if its a head gasket issue for sure and if so when you have it all apart send the heads to a machine shop for x rays to see if they are cracked. Matco tools sells a gas analyzer kit that anyone can use for about 60 bucks.also others on the web.

Posted on Jan 20, 2010

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SOURCE: bucks and stalls

Need to have it put on a code reader,auto zone can do this for you,for free.

Posted on Jan 23, 2010

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SOURCE: 1995 Chevy Blazer 4.3L V6......running

Hi, sounds like your timing chain may have slipped a tooth. Unfortunately, with a pushrod engine, you have to take the front off the engine to check valve timing. Timing gear marks should align as shown below. If they don't, replace the chain.

CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Disconnect the negative battery cable and drain the engine cooling system.
  2. Remove the crankshaft pulley and damper.

WARNING The outer ring (weight) of the torsional damper is bonded to the hub with rubber. The damper must be removed with a puller which acts on the inner hub only. Pulling on the outer portion of the damper will break the rubber bond or destroy the tuning of the unit.

  1. Remove the water pump assembly.
  2. Loosen the oil pan.
  3. If applicable, remove the crankshaft position sensor.
  4. Remove the front cover bolts and, if equipped, the reinforcements, then remove the front cover from the engine.
  5. Pry the seal out of the front cover using a small prytool. Be very careful not to distort the front cover or to score the end of the crankshaft.

To install:
On 1995-99 models, anytime the front cover is removed, the cover must be replaced upon reassembly. If you reuse the old cover, oil leaks may develop.
  1. Clean the gasket mating surfaces of the engine and cover of all remaining gasket or sealer material. Be careful not to score or damage the surfaces.

The manufacturer suggests you wait until the front cover is mounted to the engine before you install the replacement crankshaft oil seal. This assures the cover is properly supported.
  1. Position a new front cover gasket to the engine or cover using gasket cement to hold it in position. Lubricate the front of the oil pan seal with engine oil to aid in reassembly.
  2. Install the front cover to the engine. Take care while engaging the front of the oil pan seal with the bottom of the cover. On 1998-99 models, apply sealer 12346141, or an equivalent sealant to the oil pan rail where it contacts the timing cover-to-block joint (front) and the crankshaft rear seal retainer-to-block joint (rear). Continue the bead of sealant about 1 in. (25mm) in both directions from each of the four corners.
  3. Install front cover retaining bolts and tighten to 124 inch lbs. (14 Nm) on 1994-95 models and 106 inch. lbs. (12 Nm) on 1996-99 models.
  4. Lightly coat the lips of the replacement crankshaft seal with clean engine oil, then position the seal with the open end facing inward the engine. Use a suitable seal installation driver to position the seal in the front cover.
  5. If removed, install a new crankshaft position sensor O-ring, then install the sensor.
  6. Secure the oil pan.
  7. Install the water pump.
  8. Install the crankshaft damper and pulley.
  9. Connect the negative battery cable, then properly refill the engine cooling system.
  10. Run the engine until normal operating temperature has been reached, then check for leaks.

Posted on Mar 10, 2011

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