Question about 2007 Honda Odyssey EX

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P0300 code on 5 out of 6 cylynders

My car started to skip a bit and idle a little harder. I had a filthy air filter I was supposed to replace 3 weeks ago and did it last night. It did not solve the problem. I put octane booster and fuel injector Gumout I with 12 gallons of gas. Skipping got worse idling harder, but stiil has power. Auto Zone guy did OBD II test and 5 out of 6 cylinders were misfiring. Should I just change plugs?

Posted by Anonymous on

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  • Honda Master
  • 4,364 Answers

I sure would. maybe the coil also

Posted on Aug 11, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

txkjun
  • 409 Answers

SOURCE: Honda Misses.

Pin point the dead hole and check that injector.

Posted on Dec 24, 2008

roedmondson
  • 68 Answers

SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

Posted on Feb 14, 2009

philschneide
  • 448 Answers

SOURCE: 1991 Honda Civic 1500 idles irregularly, with check engine light.

I think I would suspect the fuel injectors, especially since that is the code you are getting. Fuel injectors clog up, get dirty, stop working the way they should. They can be cleaned (you can remove them and send them to a company that cleans them and makes them like new, or, they can be cleaned in the car by some garages, or, you can get a can of Sea Foam spray and spray it into your throttle housing several times to try to do some cleaning that way, or, you can dump a can of Sea Foam (non-spray) into your gas tank and run it with the fuel through your injectors). You should probably check when you first start the car to see if you are getting any leakage from one or another injector (one or another may look moist or wet if the seals are leaking). You can also do the long screwdriver test (hold the bit of the screwdriver against each injector in turn and listen with your ear against the other end to see if each is clicking regularly). I would try the Sea Foam first.
I hope this is helpful in getting you started on a fix.

Posted on Dec 16, 2009

Testimonial: "Quick response and good suggestions. I have not yet verified the solution but believe that I'm troubleshooting in the right direction."

  • 77 Answers

SOURCE: 1996 Honda Accord Rough Idle Even After tune up

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Posted on Mar 05, 2010

lucasrivera5
  • 3 Answers

SOURCE: 1998 Honda Civic 1.6 5 speed - Error codes: po300,

Man it sound like u needa replace the idle valve selenoid .. but try cleaning it with a sensor cleaner spray and then try it it will help trist me i did that to mine it worked

Posted on Jul 16, 2012

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