Exhaust Leak Cause Rich or Lean Condition

Stanger007 · Dec 20, 2006

I'm running a bit rich at the top end of the track so I've been doing some datalogging leaning things out. Saw something while I was doing this...

I noticed today that my KAMRFs at idle/cruise are around 3-5% different between the two. I've got the MAF curve spot on and injector timing squared away as well.

One K hovers very close to 1.000, the other reads as pulling fuel at around .97-.95.

First off, in Calcon, is KAMRF2 (the one reading rich) on the driver's side? If no one knows I'll just datalog one sensor and see which one is which. It's raining now and I don't feel like messing with the car in the rain.

My W/B is in passenger side and it seems to be reading spot on for the AFR I'm shooting for at idle and cruise.

Thanks guys,
Wes

Stanger007 · Dec 20, 2006

It quit raining... KAMRF2 is the driver's side.

Now to figure out why I'm reading richer on that side than the other...

final5-0 · Dec 20, 2006

My KAMFR and Lambse rarely read the same on each side

I've never worried all that much about it

Not sure here, but at least it would seem if you pull in additional air upstream from your WB, it would sense a false rich reading

Grady

Stanger007 · Dec 20, 2006

final5-0 said:
My KAMFR and Lambse rarely read the same on each side

Agreed - mine are different but normally somewhat in sync. This time, however, one side is constantly 3-5% rich when the other is dead on. Looking at old data logs, this is a new thing.

Both O2s are relatively new - might swap them and see if the trend swaps along with them.

Trying to get little issues like this nailed down before I pile on the boost.

Thanks for the input Grady!

Wes

Stanger007 · Dec 20, 2006

Reading through my EEC book, the O2 sensors measure the presence or absence of oxygen in the exhaust stream.

Excess oxygen is a sign of a lean mixture.
The lack of oxygen is a signal or a rich mixture.

The driver's side O2 looks to be cycling between .07v and .79v... pretty normal.

Wideband in passenger side says I'm idling between 14.8:1 and 14.0:1.

The difference is most noticable at idle (low exhaust flow).

I'll have to check for an exhaust leak on the passenger side - my EGR bung may be leaking a bit causing that side to think it's running leaner than it really is and causing my driver's side to run a tad rich. Might re-tighten header bolts as well just to be safe.

Glad this is the only "problem" I have with my 'stang though... could be a lot worse off.

Wes

m0l0 · Dec 20, 2006

Well i have kinda the same "issue" the first datalogs displayed equal karmfs, but now i have a top 3% diference , i think there is nothing wrong to see top 5% of diference between banks, more diference and you will be looking a header leaks/bad o2

Just my 2c.

final5-0 · Dec 21, 2006

Stanger007 said:
Reading through my EEC book, the O2 sensors measure the presence or absence of oxygen in the exhaust stream.

Excess oxygen is a sign of a lean mixture.
The lack of oxygen is a signal or a rich mixture.

The driver's side O2 looks to be cycling between .07v and .79v... pretty normal.

Wideband in passenger side says I'm idling between 14.8:1 and 14.0:1.

The difference is most noticable at idle (low exhaust flow).

I'll have to check for an exhaust leak on the passenger side - my EGR bung may be leaking a bit causing that side to think it's running leaner than it really is and causing my driver's side to run a tad rich. Might re-tighten header bolts as well just to be safe.

Glad this is the only "problem" I have with my 'stang though... could be a lot worse off.

Wes

Well Wes

What can I say but ............

More O2 means Less fuel!

DON'T FOLLOW ME I'M LOST

I do agree about your concern the banks have just recently started to read the larger than normal range difference.

Grady

Stanger007 · Dec 25, 2006

final5-0 said:
More O2 means Less fuel!

We're saying the exact same thing.

You're speaking of the reading in terms of BEFORE the adaptive strategy tries to compensate - I'm talking about what the EEC will do as a result of the reading.

Sounds like we're on the same page just looking at it from two different angles.

Merry Christmas!
Wes

Exhaust Leak Cause Rich or Lean Condition

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