Ford Mustang Forum banner

Running Lean with tune?

3K views 20 replies 5 participants last post by  RaceRedGTCS 
#1 ·
Having issues with check engine light flashing and going steady then throwing error code p0300 and p0301. It usually happens around 4k and after car is hot.

Collected some data and it looks lean to me, but I was told everything looked ok and to check my hardware. Checked hardware and everything felt tight and secure.

Always like to get a second opinion. Maybe someone with a little more knowledge could take a look at the data. I have a C&L CAI and boss intake along with roush axle-backs.

Thanks.
 

Attachments

#6 ·
Did you put your foot to the floor in this datalog? It looks like you're about 1/2-3/4 throttle. That's why it's not going into optimum power mode.

Go datalog again in 3rd or 4th gear from like 2500-7000, foot to the floor and then post back up. I am willing to bet it shows .850 lambda or 12:1 air/fuel ratio.

Your P0300 and P0301 are cylinder 1 misfire codes, which are common in 2011 GT's. We'll see how this datalog you post up looks and go from there. Probably not a tune problem, but we'll look into it.
 
#9 ·
Did you put your foot to the floor in this datalog? It looks like you're about 1/2-3/4 throttle. That's why it's not going into optimum power mode.

Go datalog again in 3rd or 4th gear from like 2500-7000, foot to the floor and then post back up. I am willing to bet it shows .850 lambda or 12:1 air/fuel ratio.
Cant say 100% foot was to the floor. will try again.
Thanks.
 
#7 ·
nvm. chris is here.
 
#20 ·
Datalog looks good! Looks like air/fuel ratio is between .850-.900 at WOT and timing peak is 26 degrees. It's pulling timing, but not via the knock sensors. You went to 7000 RPM a few times there, and only once did the knock sensors pull timing, and only after the 2nd shift, so I imagine 3rd gear. The timing is low, and it's more than likely because of how hot it is. Nobody is able to keep their intake air temps down this time of year.

Chris Rose
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top