Question about Chevrolet Blazer

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04 chevy blazer obd codes p0101 and p0300 changed wires plugs distributor maf pulled cat and muffler tried crank sensor and ignition module. at first wouldnt go over 20 mph then wouldnt start. did full tune up and now runs but not great still rough, no pick up and sucking down gas about 8.5 miles to the gallon. obd says bank 2 running rich about 20g and bank 1 running lean about 0-1g, and of course the o2s since there isnt one on there now, until we can find the problem.

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Change your O2 sensors. Try the airfitler, fuel filter and make sure your getting sufficient fuel pressure.

carsandcomps,

Guru Premium Expert @ Fixya.com

Posted on May 30, 2010

  • kellylevey May 31, 2010

    tried that getting perfect fuel pressure and air filter is new.

  • Brandon Bruce
    Brandon Bruce Jun 02, 2010

    Okay, if this is distributed, check the cap and rotor - replace if either (both usually will if one does) have white powder residue, or are grooved and warn. The metal points in the cap may be grooved and will prevent a proper spark.

    Let me know if you need further assistance.

    carsandcomps,

    Guru, Premium Expert @ Fixya.com

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2 Answers

Has p0300 code misfire cyl 2 and 3


If it was just cylinder 2 or 3, the code would be 0302 or 0303. Instead, you have random misfires (probably) such that you should be checking things that affect the whole engine. Vacuum leaks, bad plug wires, bad coil(s) or ignition module are most likely, but even clogged exhaust, O2 sensors and bad battery can cause these problems. Yes, a battery can be good enough to start your car but still be bad enough to affect performance. If I had to guess, I would start by testing the ignition module. Most parts stores can test this if you remove it and carry it to them.

May 04, 2015 | 1998 Chevrolet Blazer

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I have a 98 Chevy blazor 4.3 4x4 it has no power and sputters change fuel filter,mass air sensor,o2 sensor,plugs,wires,cap,rotor,module on desributer check fuel pump psi at 55 to 57 the only code random...


Pull the distributor. Check the gear on the bottom of it. Replace a bunch of them for wear. Causes no power and bad timing. Depending on wear. Replace the gear or the distributor.

Nov 08, 2014 | 1998 Chevrolet Blazer

1 Answer

What is code p0101/p0300/p0171


code p0101 refers to MAF sensor and VAF sensor--range /performance problems===causes --intake leakage/blockage ---MAF/VAF sensor failure.

code p0300 refers to random misfires multiple cylinders ---causes --spark plugs /HT leads --injector /s-- ignition coil/ s--low compression ---wiring

check fuel pressure in manifold and HT leads

code p0171 refers to system too lean bank 1 ===causes --intake /exhaust air leak---AIR system---MAF/VAF sensors ---fuel pressure /pump---injectors ---HO2S sensor

Basically there are two codes referring to the MAF/VAF sensors so check them out and two codes referring to fuel pressure and pump so have a pressure test done on the fuel manifold to determine if pump or pressure regulator.

Aug 24, 2014 | Cars & Trucks

2 Answers

Why the loss of power and po300 code?


HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
Common Causes
  • Low Fuel Pressure
  • Vacuum Leak
  • EGR system malfunction
  • Internal Engine Problems (such as low compression)
Less Common Causes
  • Faulty Coil
  • Faulty Spark Plugs and/or Wires
  • Camshaft or Crankshaft sensors
  • Ignition module
  • Computer

Jun 12, 2014 | 1998 Chevrolet Tahoe

2 Answers

99 chevy blazer no spark to 4 out of 6 plugs


in the distributor is a ignition control module

Nov 12, 2012 | 1999 Chevrolet Blazer

4 Answers

2004 Chevy Blazer. Poor acceleration, limited rpm. Code p0101


Check your catalytic converter, good chance that it has broken apart and is blocking exhaust flow. Common Chevy 4.3L Issue.

Mar 16, 2010 | 2004 Chevrolet Blazer

2 Answers

Have two codes on 1999 chevy blazer


p0404 is egr flow range, remove and clean egr passage way, it maybe built up with carbon, p0101 remove and clean mass air flow sensor. you can buy the cleaner at any auto parts store. but be carefull of the inside of sensor, follow directions on can. this should help a lot!!

Feb 24, 2009 | 1999 Chevrolet Blazer

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