When does it stall out? if this happens as you come to a stop or trying to take a turn while the engine drops to idle speed then it is the same issue and it is a fuel map issue.

If it stalls out while you on the throttle then that is different and separate and probably some sensor issue.

 

do you think you might be able to make us a short video of the problem?....it might be easier to diagnose that way....try and document the sensors in the video during the stumble.....

....as for voltage fluctuation....if the idle slows too much...that can cause the voltage to fall significantly....but there is also a correction map to control injector vs. voltage as well....either way...a video might help!

-Jack

 

yea it will happen while on the throttle and when it is just idling in the driveway. I can be on the throttle and all of a sudden its like the power has been cutt and the rpms drop real low and the engine starts mifiring and running real rough till it eventually kills. Like i said it just seems to happen after a certain amount of time no matter what the rpm or situation is.

 

Sure i can do that. I was actually thinking about doing that last night.

 

This is going to be a bear to solve without a FCON pro-tuner's help... Are there any in your area? I bet it would take them less than 30 mins with full access to the FCON. I'm not that familiar with the tuner's software but can JT look at your maps saved on his laptop? I mean if all the maps check out, then nothing has been overlooked with the tune and you can perhaps just verify proper sensor operation with Cipher datalogging as jb suggested above. No remote end user support with the FCON is a big negative - HKS listen up!!!

 

Wouldn't it be possible to connect to the FCon management program through Windows Remote Desktop?

I don't know anything about the FCon, but if it is similar to the Haltech's management system, you could build a digital dashboard and monitor exactly what's happening. Seems like it might be worth a try.

Edit: Just realized after reading Raj's post that Windows RD is a bad idea because the user does not have the FCon tuning software on his PC. I am in Haltech mode, sorry.

Couldn't you load the FCon management program on the OP's computer and then let the Tuner log in using Windows Remote Desktop. The OP couldn't access anything because he doesn't know the secret password, but the Tuner would and could login and look around.

 

FCON tuners have a "key" that is necessary in order to access the unit. I think it is some kind of usb plug in

 

The computer that is physically connected to the FCON, needs to have the FCON software, AND the USB encription key plugged into it....both of which are not publicly available. How about hooking up an OBDII scanning device/Cipher like Raj mentioned, and see if the stock ECU is getting correct signals. The FCON relies on the stock sensors, so if a sensor is malfunctioning, it will be seen on the Cipher.

I can't think of a scenario, where the FCON map would suddenly get screwed up, especially since there is no AF feedback in place.

 

jb, we think alike. I asked Sharif the same thing when I was deciding on a standalone. The HKS lock down implementation is suboptimal for customers and tuners alike. Data entry errors are always possible (and perhaps more likely than sensor failure) and if the cell was never used till the customer left then I can see that happening. Not really a map going bad. Can a pro tuner save a customer's config and load that up for viewing on a laptop without being physically connected to the car? (Haltech can, Osiris/Cipher cannot, but not sure about FCON).

 

yea guys i am seriously starting to think this may not be a fcon related issue. All of the sensor outputs are fine and the fact that the car was run in so many different states and conditions prior to the problem arising makes me question how in the world would the car not experienced this on the way home or when PF had it.

I AM STARTING TO GET FRUSTRATED!!!!!

 

Back to basics then: air, fuel, spark. How does your wideband read?

 

I can understand that. On the positive side, you have many of the smartest people on the forum offering help.

I would do two things:

1. Make a video of the problem when it happens. Try to make sure the sound is good so everyone can hear the engine when it stumbles. Maybe make a second video with the hood open when it stumbles.

2. Use Cipher to log the engine when it stumbles. I think that if you log the correct parameters in Cipher, the graphs will tell you what is happening - what is wrong. I'd start out logging the engine speed, calculated load value, ignition timing, temperatures, A/F, and throttle position sensor. You're probably not using the MAF sensor, so no reason to log that. Maybe some of the Tuners can give additional items to log.

 

bahahahahha. Your not going to believe this!! My wideband isn't working. I tried changing the sensor the other day and it is still not working. It seems as though gauge isn't even getting a connection from the LC-1

Next step is to get that working and then i guess maybe get a cipher. The diagnostics tool i have only lets you pull the codes. It can't datalog or display stock sensor readings

 

Agreed! I really do appreciate all the help from you guys. Its times like this when i am reminded of how the forum use to be (people helping others, sharing tech info).

 

Cipher is well worth the cost and should be on the short list if you're FI. It will pay for itself. It's much more than a code reader. Even if your wideband isn't working, you can use Cipher to see what the 2 stock widebands read (if you have a 2004.5 and up).

 

yea i am going to be purchasing one today i think. It is something that i had intended on getting a long time ago but i never pulled the trigger because i never really needed it. I guess i am kind of kicking myself in the *** for not getting it initially

 

Sorry, I thought you mentioned in an earlier post that you already had Cipher. Like Raj mentioned, Cipher is a great tool and it will always be useful to you. It's unfortunate that you have to buy these tools to interpret what is happening, but I can see no other way.

The good news is that UpRev recently reduced the price of Cipher from $400 to $300. You'll need a special cable from UpRev (it comes with Cipher). Give UpRev a call and maybe they can air freight a copy out to you today.

 

Good to hear that the problem will be resolved soon!

 

Do you have the latest firmware on your LC-1? The update fixed a lot of the issues they were having.

 

I don't think i do, but i looked at the xd manual and it is says the display i am getting signifies that the gauge is not getting a signal from the LC-1

Is there some kind of reset procedure that is supposed to be done after the lc-1 has been unhooked?