osiris94ej
Full Access Member
You need to find the misfire data
Sent from my SM-N920V using Tapatalk
Sent from my SM-N920V using Tapatalk
P0300 and Stumble
- Thread starter swimaway
- Start date
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SLCHOE
ASE Master Certified + (L1)
Clean your MAF sensor and throttle body.
Pull out the MAF sensor (like out of the car and unplugged) and hit the hot wire elements with MAF or Carb cleaner. Dry with compressed air (be careful with air pressure if using shop air). You just want to dry it off and evaporate any solvent afterwards.
Pull off the hose going to your throttle body. Turn the key on with engine off and either have someone hold down the gas pedal or use a prop rod to hold the gas/accelerator pedal to the floor.
Go to the engine bay and spray a rag with carb cleaner. Get it wet. Then wipe down the throttle body plate on both sides and also the throttle body bore.
IT may hesistate to start after this so crack the throttle open a little with the gas pedal and crank it. Let it idle 10 minutes and repost your data.
Don't brush the sensor filaments if you've never done it. They are fragile and will break if too much pressure is applied. Spraying them with Carb cleaner gets almost all of the grime off. Just blow through it a few times and make sure that it's dry.
At the end of all this your PCM has to adapt to the new sensor readings so either just start it up and let it idle for 5-10 minutes or disconnect the negative battery cable for 15 seconds. Judging by the data from your scan tool, that tool most likely cannot clear PCM memory by a button push so those are the easiest ways to do it.
Judging by the data you provided this will either help or completely fix your issues. Good luck!
Pull out the MAF sensor (like out of the car and unplugged) and hit the hot wire elements with MAF or Carb cleaner. Dry with compressed air (be careful with air pressure if using shop air). You just want to dry it off and evaporate any solvent afterwards.
Pull off the hose going to your throttle body. Turn the key on with engine off and either have someone hold down the gas pedal or use a prop rod to hold the gas/accelerator pedal to the floor.
Go to the engine bay and spray a rag with carb cleaner. Get it wet. Then wipe down the throttle body plate on both sides and also the throttle body bore.
IT may hesistate to start after this so crack the throttle open a little with the gas pedal and crank it. Let it idle 10 minutes and repost your data.
Don't brush the sensor filaments if you've never done it. They are fragile and will break if too much pressure is applied. Spraying them with Carb cleaner gets almost all of the grime off. Just blow through it a few times and make sure that it's dry.
At the end of all this your PCM has to adapt to the new sensor readings so either just start it up and let it idle for 5-10 minutes or disconnect the negative battery cable for 15 seconds. Judging by the data from your scan tool, that tool most likely cannot clear PCM memory by a button push so those are the easiest ways to do it.
Judging by the data you provided this will either help or completely fix your issues. Good luck!
Last edited:
Hey guys, thanks for the help.
I have now tried all of the above. I still have the P0300 code. I even went as far as replacing the MAF.
Sometimes the idle feels a bit better, sometimes a bit more rough. It seems the more I drive it the worse it gets. If I drive it for a bit, shut down, and go again, it's worse.
I have now tried all of the above. I still have the P0300 code. I even went as far as replacing the MAF.
Sometimes the idle feels a bit better, sometimes a bit more rough. It seems the more I drive it the worse it gets. If I drive it for a bit, shut down, and go again, it's worse.
sumo
dn ʇǝƃ ʇuɐɔ & llǝɟ ı
Have you tried spraying brake cleaner around the base of the intake or around hoses? If the idle changes, you can get a better idea where the leak is, that is if there is one
sumo
dn ʇǝƃ ʇuɐɔ & llǝɟ ı
No misfire data? That what we need to see
osiris94ej
Full Access Member
