Question about 2001 Chevrolet Silverado 1500

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I have a 2001 chevrolet silverado with a 4.8 with a code of po300

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  • charlesshupe Jun 27, 2009

    I have already done this and still the same problem.

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  • 38 Answers

Engine misfire. a tune up plugs and wirers should fix your problem (use ony ac delco spark plugs)

Posted on Jun 27, 2009

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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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1 Answer

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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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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1 Answer

2005 silverado..5.3...motor idle rough.. getting 3 codes


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1 Answer

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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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