Question about 2003 Chevrolet TrailBlazer

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Timing belt replacement?

At what millage do I need to replace my timing belt on my 2003 Trailblazer with the vortec 4200 I6 engine?

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Check your manual it should have the inside,thanks robert b. most are 100.000

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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1 Answer

How to increase idle on 4200 vortec


You have an inline six engine and it is equipped with engine-mounted electronic Powertrain Control Module that records hundreds of measurements per second and makes immediate adjustments of air, fuel, spark control, and valve timing to provide optimal engine operation. Your Vortec 4200 uses an electronic throttle control (ETC). The ETC sends a series of signals from an accelerator-pedal module using a sensor that relays acceleration-intent data to the powertrain control module (PCM).
To increase idle you will have to reprogram the PCM using an OBD 2 software. Have it service at your dealer.

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hey my friend the thermostat in not like others its a real pain here is exactly what you have to do if u have the 4200 vortec How to replace thermostat 4 2 envoy or trailblazer
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IS THE CHEVY 4.2L I6 ENGINE IN A 2003 TRAILBLAZER AN INTERFERENCE ENGINE


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Feb 27, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Fan pulley loose,but four bolts that hold fan on are tight,like something is loose behind pulley on my 2003 chevy trailblazer/vortec 4200


Hi Cro,Seems to me as if you may have a problem with your water pump. If your vehicle is loosing coolant, that will confirm it. With the engine off and the key removed from the ignition open the hood and check for any looseness in the water pump by taking hold of the fan blades and shaking back and forth (If they're plastic be careful not to apply to much force, or you may break them!). If there is play you'll need a replacement pump!Best regards Johngee10

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1 Answer

Replace thermostat


if this a 4200 i6 it is located on the left side of engine (driverside) about half wat up the engine it can be accessed through the drivers wheel well this is not an easy job to do dealer technicians don't even like to do them.

Dec 16, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Where do i find procedures to change spark plug on a 2003 trailblazer 4200 engine


Go to WWW.trailvoy.com and do a search for spark plug replace, there should be several threads that describe the process.

Oct 13, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Vortec 4200 service manual


Fan pulley loose,but four bolts that hold fan on are tight,like something is loose behind pulley on my 2005 chevy trailblazer/vortec 4200

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