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Posted on Jun 27, 2009
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I have a 2001 chevrolet silverado with a 4.8 with a code of po300

  • charlesshupe Jun 27, 2009

    I have already done this and still the same problem.

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1 Answer

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  • Expert 38 Answers
  • Posted on Jun 27, 2009
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Joined: Jun 23, 2009
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Engine misfire. a tune up plugs and wirers should fix your problem (use ony ac delco spark plugs)

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How to fix codes PO300, PO332, and PO756

the PO300 code is for a random misfire in the engine, PO332 is for the knock sensor and PO756 is for the transmission not shifting or low vacuum.
I think if you fix the random misfire the rest will correct itself or in other words you need to replace the spark plugs and check the disturber cap for damage or carbon cracks and replace the rotor and you might be in business.
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2003 1500hd chevy silverado 6.0 liter. I had a


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2001 Chevrolet Silverado Z28: How to get out of

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Mulitiple cylinder miss fire,May be the coil boots and plugs,will fix your problem,and,or fuel injection cleaner with a couple of bottles of HEET,a water dryer to put in the fuel tank.
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2004 chev. silverado 6.0 liter. The engine code po300 and po322 came up. I reset the codes and po 322 came up again. I just changed the plugs approx. 400 mile ago. Could the codes come from a bad plug or...

Yes they could a PO300 is a generic misfire code. PO301 would be cylinder number 1 so on and so forth. check the resistance of your plug wires they should be approx. 7000 ohms per foot. it could also be a coil over plug. primary resistance of the cops should be 1-3 ohms. but since this is a misfire it would be your secondary. which should be between 20000-30000 ohms. hope I helped you out. Happy Motoring!
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2005 chevrolet k3500 6.6 duremax diesel with check engine codes po229 po300 po303 po304 came up after changeing fuel filter with water in fuel light came on also added fuel conditoner to fuel truck idles...

PO229 indicates tps circut inttermitent.
Po300 303 and 304 indicate missfires on cyl 3 and 4.. Was the fuel filter primed before starting the engine? If not ,remove and reinstall filter. Then prime filter with pump that is on fuel filter adapter. Once this is done restart and verify o/k
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you have to read out the codes. po300 is misfire detected. maybe a coil or injector. could also be intake leak
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