Question about 2003 Chevrolet Blazer

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P0305 and p0200 on a 2003 chevy blazer 4.3 , runs really rough

My truck runs really bad and I get obd2 codes p0200 and p0305

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  • 52 Answers

P0305 is a misfire on number 5 cylinder replace spark plugs, wires cap and rotor button. Please note: Does the ac cooling line/hose go over top the distributor ? If so GM/CHEY had a problem when dripping from that AC line/hose dripped down onto the distributor. That caused miss fires after a time. I hope this helps, Lee.

Posted on Feb 10, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: have code for cylinder #1 misfire on 96 chevy

these were bad for the spider injectors to fail. they are hard to diagnose with out the scan tool. the poppets in the end of the injectors get clogged and will need to be replaced. pull the plug and see if its oil fouled. they also have a problem with the #1 cyl getting out of round and oil fouling the plug. compare it to another plug in the engine. if its oil fouled the engine is no good.

Posted on Nov 07, 2009

nyspeter86
  • 81 Answers

SOURCE: 1995 chevy blazer running bad shooting an EGR code,

Hook up a fuel pressure guage. Now with the key on and engine off does the fuel pressure come up fast and hold steady at a fixed value?

Posted on Dec 28, 2008

  • 1 Answer

SOURCE: 1997 chevy truck running rough

Is this a 5.7? They are notorious for intake manifold gasket leaks. When mine did it, the diagnostics blamed it on an ignition misfire also! Replaced the gaskets and it runs smooth!

Posted on Apr 01, 2009

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SOURCE: 2004 chevy 2500HD Truck OBD2 trouble code P0101

Hello and welcome. this code P0101 indicates a problem with the mass air flow sensor. this usually requires the replacement of the mass air flow sensor. but there will be a few checks to be made before the sensor can be condemmed

Posted on Oct 24, 2010

  • 2428 Answers

SOURCE: 1997 chevy blazer gets a

p0300 is an engine misfire detected p0301 would be misfire detected on #1 cylinder and so no throught p0306SOo seeing its not related to any one cylinder i would check the crank shaft position sensor first because that and the cam shaft sensor is what detects all misfires Itcould also be caused by any of these sensors TP MAP IC VS ECT throttle position -manifold absuliute press -idle control -vehicle speed -engine coolant tempature By the way are you getting any codes or is your mil light on if so you should read the codes thatcould tell more then any one on line good luck

Posted on Nov 04, 2010

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My 1997 chevy blazer failed inspection because the obd is malfunctioning. I'm trying to find the location of the on board computer to see if I can swap it out myself. I would really like to stay away from...


The OBDII / OBD2 connector is 18" from the center of the center console.





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You will need to purchase an OBDII scanner/reader to read these codes.

The alternative method is get a OBD2 cable and a laptop + software to pull the codes.

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An inexpensive OBD2/CAN bus reader around $75-$120 is a good start.
===

Did the inspector mention anything about drive cycle or lack of stored readyness fields?

Please email on why it fail. You can append more info by click the button on TOP RIGHT of this page.

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