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Misfire po300 on 2.2L

This and po172 showed up while I was 600 miles from home at a funeral. The car was missing badly.The plugs on cylinders 2 &3 were extremely worn and smelled of gas. I replaced the plugs and the ICM after reading a GM update. The car ran fine all the way home. Now when it is cold-misses bad, po300 shows up. When car reaches operating temp, runs fine. I am going to replace O2 sensors, cause it's time & I figure they are fouled at this point. Any ideas on the problem going away at operating temperature?

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  • Saturn Master
  • 1,209 Answers

Are you sure that the plug gap is correct? and did you use the recommended plug when you changed them? You might also try running a can of sea foam thru with a tank of fuel to make sure your injectors are not dirty. Also check your fuel pressure.

Posted on Apr 24, 2013

Testimonial: "Correct plugs & gap. If those were off, does not seem that the engine warming up would make it go away."

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 261 Answers

SOURCE: Ford Crown Vic p0300 random cylinder misfire

take a look at the EGR valve it could be either vacum controlled or electronic either way what seems to be the problem is that the valve is stuck in the open position until the engine warms up you can gently tap the egr valve with a small hammer or a screw driver and you can see that it runs smooth, now if the egr valve is vacum controlled replace the valve. if it is electronoc controlled replace the valve and the module for the egr valve.

Posted on Nov 24, 2008

chryslertech
  • 115 Answers

SOURCE: Hard start when cold, running rich, poor fuel economy

Chrysler has a bulletin out for a simular condititon that involves replacing the pcm. Heres the bulletin number 18-005-04. This is only 1 possible cause , Fuel pressure, coolant temp sensor, thottle position sensor all can cause like problems. Seeing sensor values and fuel adaptives with a scan tool helps pin point problems.

Posted on Mar 08, 2009

richardsimpl
  • 230 Answers

SOURCE: aurora 1997 i have changed the fuel pump,, fuel filter plugs,

Hi there
sounds like you done allot to this car. did you clean your gas tank? Reason i say this there are times you get bad gas that water with it. and it sounds like you got water in your tank. need to get it out. Try this get some rubbing alcohol and poor it in your tank. It won't hurt it. It will soak up the water that's in your tank. try this and let me know how it goes.
Thank you for writing to fix ya.
Best Regards Richard

Posted on Dec 29, 2009

Testimonial: "yeah, i did that this morning, the gas tank had a bunch of **** in it, changed fuel filter, tank needed cleaned same prob still thanks though"

  • 254 Answers

SOURCE: 1998 Audi A4 Quattro, 2.8L, AHA, 75K miles, bought...

im a tech in the bronx and i dealt with the same code for the misfire. burt i realized that there wasnt any power to the coil of #2 cylinder. I replaced the sensor mounted on top of the air filter box, which solved this problem.

Posted on Sep 20, 2010

duane_wong
  • 6826 Answers

SOURCE: will a bad knock sensor cause a misfire. car is

A Bad Knock Sensor will not cause a misfire, unless the advance is off due to a faulty Knock Sensor. The O2 Sensor will cause a random misfire.

Good luck on this repair.

Posted on Jan 21, 2011

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