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Random misfire code po300 - 1999 Chevrolet Tahoe

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: random multiple misfire at 4000 rpm

trying setting your dwell and timeing, should correct.

Posted on Oct 08, 2008

  • 124 Answers

SOURCE: Cylinder Misfires

It could be your spark plugs or a coil. To see if it's a coil move the coil from #5 to #6 the miss will change to that cylinder with code p0306 and change #1 to #3 and see if it changes to p0303. If it does replace all the coils. You change all coil because if one or two go you know the rest are not far behind

Posted on Sep 14, 2009

philschneide
  • 448 Answers

SOURCE: po300 random mulitple misfire detected p1399

If only one of your cylinders was misfiring, you probably would be getting a more specific code than P1399.
Also check the distributor rotor along with the cap and coils and wires (as mrgreenz suggests); the EGR valve to make sure it doesn't leak; your fuel pressure which can cause random misfires if the pressure is too low; and injectors if they are really dirty. If you have really high mileage, I probably would first just change out the plug wires with a new set, then reset the DTC and see if the code comes back.
Hope this is helpful as well.

Posted on Nov 27, 2009

Testimonial: "I changed the plugs and put an additive to clean the fuel injectors and changed the egr valve. Still running rough when at idle"

  • 373 Answers

SOURCE: Random misfire on all cyliner a po300 code pops up...

It sounds like the coil is breaking down or the cam sensor may be at fault for the misfiring. Use an inline tester and connect from the coil tower to the spark plug wire to check for a good steady fire. Do this on all coil wires to spark plugs. The best time to do this is at night so you can see it fire. You may want to remove the spark plugs and inspect them for a fouling condition. If all is well then look at the cam sensor for the problem. Hope this will help you.

Posted on May 22, 2010

jsmes1027
  • 749 Answers

SOURCE: 2004 cavalier 2.2 vin f

I have expereienced this issue several times on the 2.2 ecotech usually ends up being the ignition module itself. I keep an extra module handy just for testing purposes.

Condition/Concern:
Some customers may comment on a severe engine misfire and a SES Light. Upon inspection, DTCs P0300 - P0304 may be found due to misfires on cylinders 1 and 4 or cylinders 2 and 3.
Recommendation/Instructions: If this concern is encountered, inspect circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an intermittent short to ground or poor connection on either end. Depending on the model, these circuits may short on the AC lines near the AC compressor, on the transmission mount, or on the transmission lines where they enter the transmission. If there is no problem found with these circuits, inspect the ignition control module ground to ensure that it is clean and tight.
If there is no problem found after performing the suggestions above and the SI diagnostics lead to ignition module replacement, replace the ignition module as directed but also replace all of the spark plugs and clean the ignition module ground to possibly prevent future ignition module damage.
Measure the resistance of the ground circuit of the ICM from the harness connector of the ICM to a good ground. This should be 3 ohms.If it is not replace the module.

Posted on Jan 03, 2011

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fixed my PO300 code MY350Z COM Forums

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