datalog shows kamrf 15% different

[tealstang67]

Hello everyone
I have had an issue with bank 2 having a 15 % difference in the kamrf. I have checked for exhaust leaks,intake leaks,i changed the 02's and so on. Does anyone have any ideas on what else to check. Thanks

 

[final5-0]

I can't give you an exact answer

But I can share some trends I've seen

A difference of 1 to 3 points between sides is not all that uncommon

A difference of the magnitude you speak of is usually something mechanically
wrong like sensor, sensor harness, main harness feeding sensor, e leak,
v leak and the like

Is the difference the same at all points in the range of Closed Loop?

Grady

 

[tealstang67]

The difference is at low rpm( cruising ) low load. I have noticed when the engine is making the most vaccum the fp is like 32#'s this is when it seems to do it worst. I was wondering if my injectors may have a problem. Thanks

 

[final5-0]

I know I've not been much help to you

As for the fuel pressure reference ....

I'd not be able to comment about that as I just use the OEM regulator
and my need to know the pressure has never came up so I don't
have a gauge

I've never looked at any vacuum readings on my 95GT as well

When dealing with Closed Loop, I kinda used reference points such as
pulse width, load, kamrf, lambse, maf volt, and such

If you have not set your fuel pressure back to OEM value
Maybe that would be a place to start and see if things change

My first thought would be a leak of some sort

I did see you got new O2's but if you suspect one of them
You could switch em and see if things change

Grady

 

[tealstang67]

Thanks i did swap the 02's made no difference. This week when i get a moment i will swap the 02 extensions. I really dont know what else to do except pull the lower or replace the injectors, Don't know what else to look for.

 

[final5-0]

I guess you could swap left and right side inj's and see if things change
with your K values

Grady

 

[tealstang67]

that may be good also i read somewhere that the orings may need to be replaced. Hopefully i can work on it tuesday or wednesday.

 

[Don 95Vert]

First off - Look at short term trims with adaptive off - not sure what short term trims are called in TwEECer language - see if the trims are off bank-to-bank at idle, then see if they are off at higher RPMs with some lod on the engine. That will tell you more. If they are off at idle and low RPMs but even out at higher RPMs, it is 99% an undiagnosed exhaust leak ahead of an 02 sensor - it only takes a pinpoint leak to do this. It will allow atmospheric 02 to enter and screw up the readings. At lower RPMs the 02 will be a higher percentage of the total gas volume in the pipe as opposed to higher RPMs. The 1% other chance is a vacuum leak on only one bank.

If that's not is, swap injectors bank to bank and see if the trims follow the injectors. If they do, have someone diag the bad injector with a Snap-On Verus or Modis - if they know how to use it they can figure out what injector is bad. If this is the case - do not go to WOT with it...

Good Luck!!

Don

 

[tealstang67]

thanks i still don't understand how to tune do to the stft and ltft. I am tuning with a Quarter Horse. I may have a bad header but not sure how to make sure seems to sound funny on bank one but i can't find a leak or carbon tracks any where.