I will skip all the long details and try and be as descriptive and as short as possible. My tuner OldSkool will be stepping in shortly to shed some more thought out issues.

To Start this is what I am running:

LNF Manifold
LNF Turbo
LNF Downpipe
LNF Injen Charge Piping
LSJ Tb
Custom 3" Cold Pipe
LNF FMIC
Saab Intake Manifold
Blow Through MAf (3" cold charge pipe from 3" SC Intake)
42# Injectors and #60 Injectors
Running factory Wastegate pressure for now (~15psi)
All new gaskets, cleaned all surfaces

The issue from the first start we were having was high idle (1800-2000) and extremely lean idle on #60 injectors. We assumed the injectors may have been bad so we tossed in the #42 injectors and that did not fix anything. We sprayed brake clean over the entire intake manifold checking for vac leaks and not a single change) Anything over 25% throttle would throw it into ERP mode (however we found the TB plate was hitting the adapter block for the Saab Intake manifold and that issue has been rectified). This is the issue now, now matter what we do tune wise the car does NOT want to idle correctly and the car is consistently showing 20%+ fuel trim issues during all driving. The only way to get the car to behave is to completely RAPE the maf settings. We have the tune from the previous LSJ converted car that ran this kit prior and his tune is very similar to a GM Stage 2 tune minus some injector differences and other small stuff, this tune even more similar to my custom tune from the 3.0" pulley does nothing else then mentioned above. We are completely dumbfounded and at a loss for ideas. We felt we should post here and at least get some fresh ideas. This kit came off a running driving LNF equipped LSJ car, so this is why it is so confusing to us.

I have the TMAP in the Saab manifold and have tried both the SCIP Sensor hooked up and NOT hooked up, Map Baro sensor was never touched. Does anyone have any ideas?

If anyone wants me to call, explain live or whatever PM me your number and I will call.

Thank You!

 

Not going to write a book on here, so I will call you and/or your tuner..... Sounds like unmetered air/vac leak...

 

yep

 

As soon as I can get over to the car I am going to check injector cups, if that does not fix it I will yank off that intake manifold and check for any sort of crack or missed port.

 

I had this issue a while back. make sure the spare ports on the manifold are sealed off and not leaking air. The issue is a boost or vac leak somewhere. As far as tune is concerned, I can send you a copy of my current tune, done by blkwdoss. Its not perfect, but it is a good daily driving tune. If you want, you can PM me and I'll send you my number so you can txt me.

 

Seeing as we haven't even hit boost it has to be a vac leak. So as soon as I can get back to the car I am going to go over that intake manifold and cups.

 

I'll PM you my number. txt me tomorrow and i'll send you pics of the areas of the manifold I think you should check.

Also, what is your TB setup like? I use the lsj tb and had to get 2 ottp tb spacers to clear the I/M. Is it possible the I/M manifold gasket didnt seat correctly and has a leak?

 

Previous owned made a custom TB adapter block. It is about 3/4-1" thick, and am using the LSJ tb. I am going to check the intake manifold gasket when I get back to the car, it is at a friends house and it is not freely available. I am thinking saturday I will get over

 

when you can, i want to see pics of the adapter block. did you run your evap line back in to the side of the tb?

 

No, the block was not shaved out for the EVAP and it was blocked off. We felt it was not a big deal, and we have a GM tech there too. There is no vac at the port on the TB anymore, we have it capped off just in case

 

if you're running stock fuel system that may be your problem

 

He ran it the same way, all that solenoid does is vent some fumes from the tank under normal cruise

 

then you have a major vac leak somewhere. i have a feeling i know where. I'll send pics tomorrow.

 

ok if I do not respond you can always post here and I can check it once I am home.

 

FYI once we did maf rape and had idle timing at zero it finally idled normally but that is indicative of a leak somewhere. I am hoping your advice can help us zero in on the issue

 

pics of your setup, also email your tune for details

 

We have determined the tune isn't the problem. We have 2 high end tuners both saying what they ar seeing via tuning shows there is a vac leak post maf. I should have theoretically been able to flash the previous owner of the kits tune and just drive away with minimal adjustment.

 

The fuel trims at idle (LTFT and STFT) max out positive at idle with a reasonable maf calibration and ve table, meaning when compared to the tune that the previous owner of the kit ran, we are adding over 50% to the maf calibration and/or ve table to get it to idle at a reasonable trim. And even when the trims are reasonable, the idle rpm is all over the place, as high as 1600-1800rpm, and it stumbles when it gets down to 900-1000. We are commanding 900rpm idle warmed up.

The car is running stock GMS2 INJECTOR settings and 42 lb injectors, all working flawlessly before the swap. The diameter of pipe in which the MAF is located did not change, meaning the diameter of the intake pipe where it was located with the s/c kit is the same as the cold side pipe where it is located now. Putting those two facts together tells us that something else is wrong. It should go that far out of calibration when the pipe diameter and injectors haven't changed.

FacepalmIRL, your pics will likely prove to be very valuable. Thanks everyone for the ideas so far!

 

could it be the port on the head not lining up with the port on the saab manifold? leak in the charge pipes?

i know on mine it will idle funny without the vacuum canister, do you have cams? you might not be making enough vacuum and the systems trying to fix itself? without the canister mine will hunt for a good idle and the wastegate will chatter a bit. then idle normal(granted its on a sunfire)

just a thought

 

I was thinking the same thing, does the PCV port on the saab manifold line up with the PCV port on the LSJ head?

I've never seen the flange side of a saab manifold before..so it might be a dumb question.

 

Factory cams, we got it figured out, tmap hole was too big, and the second my buddy fixed it it idled pig rich. When he taps th gas it smashes 10:0 afr, so we're confident its now just going for tuning runs

 

good to hear, my leak was part BOV leaking around the brass spring housing and I think an exhaust leak. Have to go back and do a once over on the manifold bolts tomorrow. I heard an exhaust leak the past two days we have had nice weather.

 

We have a bad exhaust leak which we cannot find, however we cleaned and used new gaskets on every surface minus the 02 housing to turbo, so I ordered a new gasket there and we'll throw that in shortly. Second, we haven't even had the chance to get into boost yet

 

i am glad I started to hear the exhaust leak the past few days honestly... I was going to have my turbo rebuilt with Forced Performance. Was going to upgrade to their DSM FP green turbo and was going to be expensive but room for more power. I still want to see what hahn's standard 20g will do first. Hope tomorrow I can tighten everything down and get back to my 22 psi daily driver.

 

Well we finally found and solved all issues and are finally getting to tuning. Got it tuned on 16 psi but am having over heating issues.

Can anyone help with how they ran their cooling lines on their lnf equipped lsj