LTFT's 16.41 @ idle and while off gas.

[PANDA]

I have had this issue for about a week now ever since I changed my IFR table via a spreadsheet Tommygloves and I have been working on to calibrate my DIC mpg with my 42lb injectors. I also reset the MAF to a stock LS6 at the time to start MAF tuning fresh with the warmer weather. (have N* and LS6 maf). This could have been a coincidence though. At idle my car sits at 16.41 LTFT and when I let off the gas cruising. At other throttle positions it is normal for a untuned MAF table, and im not concerned. This only happens when the car is warmed up. When its cold the idle trims seem kinda normal. Wideband also pegs lean when I let off the gas if im going fast enough (I was told this was normal). Thinking this could be a vacuum leak I searched last night for one. I found a big rip the rubber T under the snout. Drove around trying to find a new one at 8:00 at night but failed, I was later told this is a dealer only part. I bought a plastic T and some fuel hose and made a new vacuum T and installed. After resetting the fuel trims and driving around for a bit the LTFT's went back to 16.41.

I don't really think this is a tuning issue but rather a vacuum leak somewhere, that I cant find. I read this post on clubgp and think I may also have developed a leak, because I am running these same ZZP garlock supercharger gaskets.

http://www.clubgp.com/newforum/tm.asp?m=4809538&p=1&tmode=1&smode=1

Click to read more...

 

[DanJ]

That T comes in a set with the T for the FPR and the lines that connect it to the LIM T you're describing, and a line that goes back to the MAP sensor i believe. That's also the only place i've been able to find it and it cost 23 bucks last i checked. I'm sure if you looked harder you could find a generic rubber T that fit the LIM and those lines but I'm not sure where.

 

[radioguy6]

 

[The Broken Regal]

if its pegged at that ltft value im 99% sure its a vac leak and not injector/fuel related

 

[TommyGloves]

Is your oil cap on tight?

 

[Bru]

What's your PCV setup?

 

[Ron Vogel]

If you have a vac leak that seems impossible to find, the first place I look are the injector bosses. I've doubled up o-rings to fix them before. PRJ had a PN for some Sorensen brand o-rings that were a little thicker thn normal to help in this, but unfortunately I don't have it written down anywhere.

 

[MuffHugger]

Vacuum leak. What are your STFT's? Get a can of brake clean or carb spray and start spraying. If you hear an RPM change, you know where the leak is.

 

[PANDA]

Vacuum leak. What are your STFT's? Get a can of brake clean or carb spray and start spraying. If you hear an RPM change, you know where the leak is.

STFT's are all over the place... What you mean spray everything, the vacuum lines?

 

[OffshoreDrilling]

If you want to try changing out injector O rings, I have a brand new set you can just have Panda.

 

[TommyGloves]

STFT's are all over the place... What you mean spray everything, the vacuum lines?

Just quick bursts on the rubber connections and potential areas for leaks.

 

[PANDA]

If you want to try changing out injector O rings, I have a brand new set you can just have Panda.

IN

 

[02BlueGT]

Not only vacuum leaks though panda, Anyplace air can get in after the MAF, check your clamps and couplers, and the LS6 maf housing itself......I had a 16.4 LTFT that just required a slight bit of maf tuning to fix

 

[MuffHugger]

 

[PANDA]

gtp mike do u guys have said "smoke machine"

 

[10sec]

I have had this issue for about a week now ever since I changed my IFR table via a spreadsheet

This could be your problem, i'll bet you mis-calibrated your shit provided there aren't any vac leaks. Start scaling the IFR table UP in your case to add fuel in the idle areas of the IFR table. Don't screw around with the maf until you get your IFR table done correctly. Have you any idea how much vac your pulling? I'm assuming you don't have a gauge since your car clearly isn't a rececar like mine.

p.s. the up and down temperatures we're going to expierience for the next couple 2-3 weeks is going to play hell with your maf tunes. One day they'll be spot on and the next they'll be off.

 

[MuffHugger]

gtp mike do u guys have said "smoke machine"

I don't believe so.

 

[Eagle]

OMG the temp swings are driving me batty on MAF tuning...

 

[02BlueGT]

OMG the temp swings are driving me batty on MAF tuning...

They cause my part throttle KR to come and go

 

[TommyGloves]

PANDA- How much adjustment was applied to your IFR table the last time you changed it? +/- %? Did you also apply the suggested MAF changes? Send me your sheet and bin if you would.

 

[PANDA]

PANDA- How much adjustment was applied to your IFR table the last time you changed it? +/- %? Did you also apply the suggested MAF changes? Send me your sheet and bin if you would.

Not sure, I plugged in my gas readings into the sheet and used a stock LS6 maf file for calibration because I reset it. Then imported the new IFR table and kept the maf the same because it didn't change. Did I fail?

 

[TommyGloves]

I think you did.

Do you still have a copy of the old bin right before the changes with the DIC tuner sheet? If so, send me those along with your new bin.

 

[PANDA]

I think you did.

Do you still have a copy of the old bin right before the changes with the DIC tuner sheet? If so, send me those along with your new bin.

Yeah I save a copy of the bin everytime before I make any change.

If your saying all I need is MAF tuning. Im going up to Lake Geneva on Sat and will scan the car the whole way up.