Bank 1 STFT showing lean

[StealBlueSho]

2010 SHO, Tuned, 170 thermo, .030 plugs, 3bar, catback, and Airaid exhaust...

When I am data logging I am showing bank 1 leaning out and the ecu having to throw an additional 20-22% fuel into it to attempt keeping the demanded lambda... this is under WOT only...then it runs pretty rich for a half second or so until it corrects.. I have seen it drop to .68 lambda before the ecu brings it back in line after adding a bunch of fuel..

Bank 2 is only having to throw an additional 5% - 7% and occasionally taking away fuel as it will run rich under WOT for a half a second.. so bank 2 seems within normal range to me...

Bank 1 seems to creep up .02 lambda higher than Bank 2 under WOT.. consistently.

This is a with and without letting the LTFT get adjusted yet... when LTFT are set then I am still seeing lean STFT variances on bank 1..

I have checked for exhaust leaks around the WB sensor on bank 1 and didn't see anything, also swapped out the WB on that bank just to verify that I didn't have a lazy sensor which didn't seems to make any difference...

Brand new lpfp...

I am holding a hair over 16lbs of boost with boost spikes of 20-22 when shifting... timing is pretty advanced as well..

Not sure what else to check? Could be chasing my tail here and just dealing with the fact my fuel system is maxed out?

From what I am reading most people are holding around 14-15psi? Not sure what they are running for timing...

Yes, I could ask my tuner... but I am more curious about the STFT on bank 1 and if that is normal when the fuel system starts to tap out..

If so then that's fine, just time to order meth...

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[glock-coma]

Paging resident logging guru ajpturbo......
Paging resident logging guru ajpturbo......

Sound like you covered all the things I would've recommend checking.
I'm sure someone will be here shortly to help.

[SHOdded]

Very brief spikes in STFT are not abnormal if suddenly going from cruise to WOT.  But the reaction should be similar between banks 1 & 2, that's important.  No reduction in apparent performance though?

Have you ever run fuel injector cleaner in your SHO?  Even with the best fuels, fuel rails can get gunked up, one side sometimes more than the other.  Might take 2 or 3 tankfuls to see an effect.  Techron concentrate (the 3,000 mile one) or BG 44K.

Probably not the spark plugs or coils, you would see/feel the misfire, even without codes being set.  There is a possibility of timing errors (VCT solenoid or phaser) on bank 1 (usually logged as VCTADVERR in ForScan Lite).  What oil & filter are you running, and how many miles on the current combo so far?

[ZSHO]

I would expect to see at least a few Codes set!!...How many mile's on your SHO?   Z

[StealBlueSho]

Only has 48K on the car... I was having fuel system issues several months ago, but a new lpfp helped significantly. I originally couldn't even run the base 3Bar tune without hitting fuel cutoff, that issue has been resolved however.

I have never run fuel cleaners through the system... I have read a lot of mixed reviews running fuel cleaners through a DI system... but at this point... probably worth a couple bottles.

No codes set... nothing.. ecu is as quite as a mouse... not sure how long I would need to drive it through for the LTFT to read lean enough to throw a code though... I don't drive it much...

heh, the last run I did, the datalog has bank 2 needing to be leaned out from to much fuel and bank 1 is getting fuel added because its running lean...  no knocking either..  I have seen this on a N/A car before, but it was because the timing was all bunged up, however, it was like that that moment it turned on, not just under load.

Just curious if anyone has run into a similar issue with these motors..

[StealBlueSho]

Very brief spikes in STFT are not abnormal if suddenly going from cruise to WOT.  But the reaction should be similar between banks 1 & 2, that's important.  No reduction in apparent performance though?

Have you ever run fuel injector cleaner in your SHO?  Even with the best fuels, fuel rails can get gunked up, one side sometimes more than the other.  Might take 2 or 3 tankfuls to see an effect.  Techron concentrate (the 3,000 mile one) or BG 44K.

Probably not the spark plugs or coils, you would see/feel the misfire, even without codes being set.  There is a possibility of timing errors (VCT solenoid or phaser) on bank 1 (usually logged as VCTADVERR in ForScan Lite).  What oil & filter are you running, and how many miles on the current combo so far?

If I was not datalogging and looking at the data I would never suspect anything is wrong with car, pulls hard through the entire RPM range, even made a newer Camaro SS feel bad from 20 roll up to around 110, stayed at least a car length ahead the whole time, even pulled away a bit more after 80.. 

Physically looking at the components, the plugs, O2 Sensors, and Tail pipes would make you think I was running rich.. nothing white showing a leaner burn.. but then again, I haven't run it hard then stopped to pull everything out either... so who knows...

2-3 tank fulls would take me 4 months or so to go through with how much I drive it...

Mobile 1 Full Synthetic with the mobile 1 filter... has around 1,500 miles on current oil.

Wouldn't a faulty VCT solenoid cause a CEL? I would imagine so.. never had one go out though an any other car I have driven that has variable cam timing... so not sure if it would throw a code. 

[sholxgt]

Ever run higher concentrations of Ethanol?

I know that many love the stuff, but it's rough on fuel system components.  Wonder if the black goo of death is what took out your LPFP and some of it has migrated to your injector rail? 

Ethanol is especially rough on vehicles that aren't used often.  Boat owners have seen a huge rate of fuel system failures do to sitting even short periods of time with just the 10% ethanol pump gas.

[StealBlueSho]

This is what the old strainer looked like on the last fuel pump...

I have never run anything more than 10% Ethanol in the system... but I am not the original owner so I can't speak for the life of the vehicle..

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[bamsho]

Did you happen to look at your rail pressure when you where having trouble.  When my first LPFP started going out, the DI pressure barely reached 1800 at WOT.  With the new LPFP its well into the 2000's at WOT. 

[sholxgt]

Maybe just my paranoia, but that looks a little black.  Or am I seeing things?

FWIW, I looked up the fuel rail and I think bank 1 isn't too expensive.  If I'm reading the diagram right, the bank 2 rail is over twice the price.  Not sure why.

Overall, I like SHOdded's idea the best.  Seems worth trying some good fuel system cleaner.

[FoMoCoSHO]

Your fuel system isn't maxed out.

I run mid 16 boost with 18ish spark and I have plenty of fuel on an E20 tune.

FRP never drops below about 2100 and peaks 26-2700 PSI

Those boost spikes aren't helping your fuel situation though, I'm assuming your TQ management is shut off?

Letting boost and spark spike on shifts just drains your rail and beats the crap out of your drivetrain.

ST's going to 20% at WOT definitely isn't normal, maybe one of your injectors is having issues.

You still have soot because the car is using trims to compensate for whatever the issue is.

Running some chemical in tank see if it alleviates the problem shouldn't be an issue, it is the cleaning services that knock chunks of carbon into your cylinders and turbos that can be problematic.

[FoMoCoSHO]

Ever run higher concentrations of Ethanol?

I know that many love the stuff, but it's rough on fuel system components.  Wonder if the black goo of death is what took out your LPFP and some of it has migrated to your injector rail? 

Ethanol is especially rough on vehicles that aren't used often.  Boat owners have seen a huge rate of fuel system failures do to sitting even short periods of time with just the 10% ethanol pump gas.

The entire ecoboost fuel system was designed to run on E-85, the fuel components are fine.

The last year has seen my car sit for very long periods of time and there is no issue.

[StealBlueSho]

Did you happen to look at your rail pressure when you where having trouble.  When my first LPFP started going out, the DI pressure barely reached 1800 at WOT.  With the new LPFP its well into the 2000's at WOT.

So to answer the question, yes, I monitor the rail pressure very carefully. Currently it will drop to 1250PSI during the major boost spikes at gear shift but it will recover to 2100 PSI... but thats when the fuel system is taxed the hardest...

When the fuel pump was going out or clogged, when under load, I could never really recover to 2100psi at any point during the pulls except in third gear when my load had evened out to 1.65. - 1.70 or so..

Your fuel system isn't maxed out.

I run mid 16 boost with 18ish spark and I have plenty of fuel on an E20 tune.

FRP never drops below about 2100 and peaks 26-2700 PSI

Those boost spikes aren't helping your fuel situation though, I'm assuming your TQ management is shut off?

Letting boost and spark spike on shifts just drains your rail and beats the crap out of your drivetrain.

ST's going to 20% at WOT definitely isn't normal, maybe one of your injectors is having issues.

You still have soot because the car is using trims to compensate for whatever the issue is.

Running some chemical in tank see if it alleviates the problem shouldn't be an issue, it is the cleaning services that knock chunks of carbon into your cylinders and turbos that can be problematic.

When I data log the FRP the highest I ever see it go is 15 Mpa which works out to around 2175psi? No where near that 2600-2700...

And I agree whole heartily on the massive boost spikes pounding the fuel rail and not being able to recover. But even then, shouldn't the STFT's and LTFT be within a nominal difference? Not 10-15% different? Let alone bank 1 seeing a lean condition and bank 2 seeing a rich condition at the same time?

TQ Management is turned off, nannies are as off as they can be on the non-pp...

Spark looks to be around 16...

I talked to my tuner about the massive boost spikes... he said it was normal to see them.   During my 2nd - 3rd shift I see a measurement of 255 Kpa worth of pressure at the intake which works out to almost 22.5 psi... which if I am not mistaken is as high a reading as the 3Bar map can see? I read somewhere that it can only really measure 2.5Bar's....

I initially thought that the massive boost spikes are what is causing my problem, but I am not sure as to why I would be over boosting so much at the shifts.. most datalogs I see don't have AS BIG of spikes as I do...  the wastegate dc doesnt get pegged at 100... although I am not sure what I would be looking for if I had a sticky waste gate..

[sholxgt]

Ever run higher concentrations of Ethanol?

I know that many love the stuff, but it's rough on fuel system components.  Wonder if the black goo of death is what took out your LPFP and some of it has migrated to your injector rail? 

Ethanol is especially rough on vehicles that aren't used often.  Boat owners have seen a huge rate of fuel system failures do to sitting even short periods of time with just the 10% ethanol pump gas.

The entire ecoboost fuel system was designed to run on E-85, the fuel components are fine.

The last year has seen my car sit for very long periods of time and there is no issue.

Even if the fuel system components are OK with Ethanol, they don't like black goo.  It has happened across all platforms regardless of make/model.  Even happens in factory E85 vehicles.

There are theories that it's in relation to how the ethanol is interacting with the gasoline additives.  Also theories that it's related to certain fuel brands and/or locations.

No fuel system is happy trying to pass the black goo.  It would not surprise me, based on the looks of that strainer, if the rest of the fuel system is partially coated.  Seems like a quality, in tank, fuel system treatment might be a good idea to try in this case.

[ZSHO]

Definitely great advice from above...would add me a couple bottles of Heet,preferably the( yellow bottle) to the mix especially if you don't drive it much,are you using a TOP tier 93 octane gas station ? There are some places that have pure gas and here's the link.  Z      http://pure-gas.org/?stateprov=VA