Question about 1998 GMC Jimmy

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98 gm blazer has black soot from muffler giving code insufficiant switching o2 sensor bank 1 and 2 any ideas ?

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  • mike bare Apr 27, 2010

    changed the stat and running 195 on my code scanner other than at idle runs real good have also replaced the cat before with one from az will try to change maf have parts car any other ideas also 55 lbs psi on fule rail

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  • GMC Master
  • 3,854 Answers

Your Jimmy is running rich, air fuel ratio is not correct. Start with cleaning your MAF sensor, a dirty MAF sensor will cause your engine to run rich or lean, other causes would be a faulty fuel pressure regulator. Start with the simple and to common and try cleaning your MAF sensor, you can pick up a can of MAF sensor cleaner at most auto parts store like Auto Zone or Part Source.
Also make sure your engine is running at the proper operation temperature 190", cold running engine will cause the ECM to run your engine rich. Causing the back soot and fouling up your spark plugs and intake ports with carbon.
The ECM was programed to recognize the 4.3 vortec to run at 190" and anything cooler will cause it to run rich and poor on economy.
Thank you for using fixya and good luck.

Posted on Apr 27, 2010

  • Harvey N Tawatao
    Harvey N Tawatao Apr 28, 2010

    Humm kinda low at 55 but should be fine. Cold start should e 62-65 PSI and will drop about 5 PSI when the engine is running. Wonder if your fuel pressure regulator is leaking.


    Turn your ignition keys to the on position to pressurize your fuel line, you should have a reading of 62-65 PSI, then turn the keys to the off position and wait 10 min and then recheck your fuel pressure without pressurizing your fuel line. If your fuel pressure dropped less then 5 PSI in 10min you may have a leak at your regulator or your check valve at the sending unit.


    The only other thing i hate to think of but will mention is the CSFI has failed, here is a link for you to read over and hope you can give me good news that it's not.


    Good luck friend.http://members.shaw.ca/betterthanyoutoo/...

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both codes point to the oxygen sensor on bank 2 sensor 1 ..
that would explain the rough running also .. the engine will default to a rich condition ...

p0154 indicates no activity on bank 2 sensor 1 oxygen sensor
p01153 is showing "low switching" for bank 2 sensor 1 oxygen sensor ...

there may be a wiring pigtail coming from the sensor. that plugs into another connector a few inches away .. check that connector for damage or corrosion .. if its ok then you likely need a new oxygen sensor ..

its not a good idea to continue driving with this condition since it will eventually damage the catilytic converter. that is probably getting very hot now with the extra load of fuel ..

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