2016 FiST Limp mode...

[jayrod1980]

I've had a persistent limp mode issue for awhile now with my tuned 2016 FiST (3900 mi). Right now I have the following mods installed:

Cobb Accessport
Tune+ custom tune
DHM Race Intercooler/crash bar
FSWerks Short Shift plate
MAP CBE
Tune+ Turbosmart IWG controller
"colder" Denso spark plugs
Cobb RMM

Almost all of these mods required removing and installing various parts of the intake, the bumper, sensors galore, etc. My car is tuned by Adam at Tune+ and feels amazing... except I run into limp mode quite often in first gear, while shifting into second, and occasionally just revving the car out (at partial throttle) in second gear. I don't go into limp mode any other time. The only code I pull is P016B. The crazy thing is that I go into limp mode at partial throttle, barely any throttle, and rarely at WOT. Third gear pulls from 2500RPM to redline are fine. I regularly show vacuum of 9.5-12.0 on the Accessport, and my car has no problem pulling 25-26psi, depending the situation. Anecdotally I seem to go into limp mode more often in wet conditions such as rain and after a car wash. The car does not throw codes or go limp everyday, but it's fairly often and only in the aforementioned conditions. This led me to believe I have a bad sensor or connection somewhere. Last time I checked my air filter it was clean and dry though. Even raising the torque threshold on the tune so that the code I'm getting is effectively disabled, I went into limp today again, but with no code as per the Accessport.

I'm away at training and don't have access to all of my tools, but for starters, I'm going to recheck all of my hoses and make sure neither of the nuts on my IWG have moved since installing. I didn't have any codes prior to the IWG install, but I did it exactly according to instructions and triple checked it when installed. I don't know of anyone having my exact problem though. I'm just looking for ideas this point as I don't want to just go on a goose hunt replacing sensors.

 

[CanadianGuy]

Try running the stock map or the other Cobb Stage maps. Do they have the same problem? If no could be a tune issue. If yes than its a matter of finding the culprit. The code usually means to much fuel to air ratio (rich mixture).

 

[jayrod1980]

Because I have a different IWG controller I believe I will throw a code if I change to stock or a Cobb tune. My reason for reaching out is really to see if there's anyone else out there having my issue, especially on a 2016. The fact that I haven't read of anyone else on the forums with the problem leads me to believe I damaged a sensor or something. I only go limp in partial throttle conditions in first or second gear.

 

[FORZDA 2]

You need to run a data log during the event or the conditions in which the code is set. The code says the fuel trims are maxed out in the lean direction (pulling fuel) because you're pumping too much fuel into the car at the part-throttle conditions. The car may run great at WOT, but still have the rich issue at part throttle. Actually, it sounds like the tune was botched or the data logs the tune is based on were faulty.

 

[jayrod1980]

Any idea how long a log can be run before it runs out of memory?

 

[FORZDA 2]

Any idea how long a log can be run before it runs out of memory?

It depends on the number of parameters logged. Did you run logs for the tune or was it a one-time flash? You could also have a leaking fuel injector. A leaking injector will make the car rich at light throttle, etc but run pretty decent when it is asked to flow more fuel. Sorry I'm not your tuner so I'm not making money on your tune. I recommend you contact your tuner so he(?) can do the troubleshooting for you. There are several steps you can take to determine a leaking injector. An injector should be covered under warranty but likely not with your mods.

 

[jayrod1980]

Thanks for the info. I have a great tuner who is working with me but I never thought of the injector being the issue. Hopefully not.