At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
I have a 2007 Toyota Sienna, p0304 and p0300, before addressing, now p0301 and p0300.
I have a 2007 Toyota Sienna 6 cylinder engine, two weeks ago the check engine light came on. It threw a p0304 and p0300. I cleared the code. Expecting it to come back. I ordered a replacement coil pack. The light did not come on and van was running well. It came back on to day and is running a little rough. I check the codes, expecting to see code p0304 and p0300, nope p0301 and p0300. So, do I have multiple packs failing, or is there something else I should check? Don't want to throw too many parts at it.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
A misfire can be caused by a few things. The most common causes are usually spark supply or fuel supply. Get BOTH of these checked.
All the misfires are on the same side of the engine so I would suspect a fuel rail or an injector issue on that side of the engine.
If the engine is still not warmed up yet and you take off like a bat out of hell, they will misfire occasionally. If it is a frequent problem change the spark plugs.
Because of the way it is set up with the coils, if one cylinder misfires it affects another one. Also, if a plug or plug wire is bad it will do the same thing. But it is possible that the head gasket is bad because you said it was low on coolant. That will also cause a misfire. Check plugs to see if any of them are wet.
Here is a good site for OBD II trouble codes. P0300: Random/Multiple Cylinder Misfires Detected, P0301: Cylinder 1 Misfire Detected, P0304: Cylinder 4 Misfire Detected.
×