2006 highlander V-6 codes 300 to 306 are set. engine is misfiring.

Question

Engine started misfiring and there is a total lack of power. It will start and run but does not want to accelerate and bucks and stumbles. Code 300 is set as well as 301 to 306. The check engine is  blinking steadily. I'm not a total dummy when it comes to engines but this is new to me. Thank you for any help you can offer.

Answer 1

Hi there,

Often times when you have multiple misfires on all cylinders it can be a problem with the timing belt. It is very possible the belt jumped time and needs to be replaced. I would do a compression test on some of the cylinders to see if there is low compression. If there is then pull the cover and check the timing belt. Other causes could be a faulty mass air flow sensor or low fuel pressure.