Question on -10% fuel on bank 2

[ace305]

My log shows -10% fuel on bank 2. I had a misfire on number 5 cylinder. I pulled the plug and it looked dry with carbon deposits. I swapped the COP with number 6. I have no new codes but a slight hesitation when I get on it. I checked compression and I am good. How to I diagnose this issue?

thanks

 

[a91what]

bank may have trended lean with the LTT [long term trim] reset the computer with a reflash. Then watch that bank again.

This leaning on the LTT can cause a lean tip in on acceleration; causes the stumble you are experiencing.

 

[ace305]

bank may have trended lean with the LTT [long term trim] reset the computer with a reflash. Then watch that bank again.

This leaning on the LTT can cause a lean tip in on acceleration; causes the stumble you are experiencing.

awesome thanks. How to reflash? unhook negative? Still puzzled why it did cause the number 5 cylinder miss.

 

[a91what]

The miss is likely what caused the one bank to trend lean

 

[ace305]

The miss is likely what caused the one bank to trend lean

thank you. COP? Plug? injector? any way to pinpoint the issue?

 

[a91what]

You moved the cop if the missfire moves to the new cylinder replace it if it continues plugs. Injector is last resort

 

[ace305]

You moved the cop if the missfire moves to the new cylinder replace it if it continues plugs. Injector is last resort

I don't have a miss now. How is that possible? How long does it take for the car to recognize the miss?

 

[a91what]

Likely it will missfire after the plug starts to foul. Give it time

 

[wmburns]

Just wondering. Is the fuel rail pressure sensor intake vacuum reference line connected and leak free?

Do the Long Term Fuel Trim (LTFT's) change between idle and load?

 

[ace305]

Just wondering. Is the fuel rail pressure sensor intake vacuum reference line connected and leak free?

Do the LTFT's change between idle and load?

LIFTS?

 

[ace305]

Likely it will missfire after the plug starts to foul. Give it time

ahhh. makes sense. thank you

 

[ace305]

bank may have trended lean with the LTT [long term trim] reset the computer with a reflash. Then watch that bank again.

This leaning on the LTT can cause a lean tip in on acceleration; causes the stumble you are experiencing.

hey, how do i refresh the computer? pull the negative?

 

[ace305]

Just wondering. Is the fuel rail pressure sensor intake vacuum reference line connected and leak free?

Do the Long Term Fuel Trim (LTFT's) change between idle and load?

 

[ace305]

a

 

[ace305]

Just wondering. Is the fuel rail pressure sensor intake vacuum reference line connected and leak free?

Do the Long Term Fuel Trim (LTFT's) change between idle and load?

hey, would you mind looking at my log? I can email it to you.

 

[OneSick99GT]

Yes pull the negative for a minute or two and pull out your headlight switch to finish draining any residue power. Re-connect and start. Make sure to drive your stang how you normally drive and make it a longer trip.

 

[ace305]

Yes pull the negative for a minute or two and pull out your headlight switch to finish draining any residue power. Re-connect and start. Make sure to drive your stang how you normally drive and make it a longer trip.

thanks, I did the flash and ran a new log same thing.

 

[ace305]

Longterm Fuel Bank 1 Min: 1.00 Max: 1.01 Avg: 1.00
Longterm Fuel Bank 2 Min: 1.00 Max: 1.16 Avg: 1.02

Compression on all cylinders - 155-160

I have a strong raw gas smell from passenger rear of the car. Only after running the car and hot. Does not smell inside the car, only outside. New fuel pump was installed when engine was. 300 miles on new MMR 900. Has Kenne Bell 2.1 with 60lb Siemans Deka injectors. Original coils 2001. New Plugs

what can i do to run a process of elimination?

Longterm Fuel bank 1 and 2 were fine when i first loaded the tune and did the break in.

 

[OneSick99GT]

Just wondering. Is the fuel rail pressure sensor intake vacuum reference line connected and leak free?

Do the Long Term Fuel Trim (LTFT's) change between idle and load?

@ace305 Double check this and let burns know.

 

[ace305]

@ace305 Double check this and let burns know.

ok, but please let me know what that is. I am unsure what to check.