so newbie it hurts. need some help with open loop

ok here's the short version:
94 k2500
355 vortec flat top pistons
gm performance cam
bbc tbi red top injectors/ 97 vortec fuel pump
I am running $OD and have the wideband wired up
Now when I start it up cold it runs super lean. But when it warms up it tends to get pretty close to normal. I'm attaching 2 datalog files one is a cold start the other is operating temp idle. I've been reading a ton but I cannot seem to get it richened up. I want to drive it to datalog but I don't want to burn a fresh motor up. Also if I give it gas it has a lean pop or backfire. Any help would be awesome

Thanks

Nice work getting a WBO2 data log posted!:thumbsup:

The attached pics are AFR running averages from the cold.xdl and run.xdl using the attached $OD .adx file.

To course tune the fuel for rich / lean change the injector flow parameter. To make all RPM's / KPa's rich decrease the injector flow parameter. For example, lets say the current injector flow parameter is 61 lb/hr. DECREASING the injector the flow parameter from the current 61 lb/hr to 60 lb/hr will make the computer "think" the injectors are flowing less fuel and will compensate or "SPRAY MORE FUEL" out of the injectors.

What WBO2 are you using (AEM / Innovate)? It's very important the WBO2 0 volts to 5 volts output is correctly configured.

dave w

Dave, I am using an AEM 30-4110 with the 0-5v output wired direct into the ecm per the screenshot. I also downloaded the spreadsheet file you created and open office to open it. But I cannot open the file. The program asks me what file type to open it and I've tried most of them. The one time it did open it was all garbled up. Can you throw me a hint?

Quote:

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Originally Posted by Mark1978

Dave, I am using an AEM 30-4110 with the 0-5v output wired direct into the ecm per the screenshot. I also downloaded the spreadsheet file you created and open office to open it. But I cannot open the file. The program asks me what file type to open it and I've tried most of them. The one time it did open it was all garbled up. Can you throw me a hint?

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The AEM 30-4110 is plug-n-play ready for TunerPro RT. The Innovate MTX-L needs internal programming to use with TunerPro RT.

I just tried Open Office Calc, couldn't get it work. I have an older version of Open Office. Maybe the latest Open Office Calc will work?


dave w

OK now I have something weird going on. I tried changing the injector flow and it brought the fuel trim where it needed to be but raised the idle. Also since I burned that chip (separate than the one I was using) I cannot datalog with it. I pop the original chip in-works. Pretty strange. The error I get is it will say connecting but it never does. I tried opening the spreadsheet again-no dice.

Try using the "Compare" feature in TunerPro to see what the differences are between the two .bin files you have tried.

Maybe post the two .bin files, so myself and other members can use TunerPro to compare.

dave w

I think I messed up something with the burn process. Maybe I accidently changed a setting or something. The chip that I was using to datalog works fine. So I copied it to a buffer and then burned it to a fresh chip-no dice. Maybe I need to uninstall tunerpro and reinstall it? I dunno. I did do a compare but I honestly could not find anything that would stop it from datalogging. Here are a few bins

Quote:

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Originally Posted by Mark1978

I think I messed up something with the burn process. Maybe I accidently changed a setting or something. The chip that I was using to datalog works fine. So I copied it to a buffer and then burned it to a fresh chip-no dice. Maybe I need to uninstall tunerpro and reinstall it? I dunno. I did do a compare but I honestly could not find anything that would stop it from datalogging. Here are a few bins

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Try burning a new chip with injector flow of 59 instead of 57.3. Injector flow changes are HUGE, I recommend small increments when making changes to injector flow parameters.

dave w

Well I have to use a track pad on a laptop to slide the values. I tried clicking on the numbers to type a value but you have to slide the bar. Did you see any reason the datalog would not function? Would changing the injector value effect idle speed? Would it raise the rpms?

ok after many different approaches I need some help. In the first bin "dataworks" data logging works, in the second bin "no data" datalogging does not work. the first chip I burned one time. the second bin I have burned multiple times on multiple chips with no change. I have uninstalled and re-installed tunerpro rt a few times. I am completely stumped. Any help is welcome.

I would try a factory stock chip, with Ignition Key "ON" Engine "Off" and see if TunerPro RT will connect. If TunerPro RT connects with a stock chip then something "unknown" is happening when you burn a chip. If TunerPro RT will not connect with a stock chip, then it would appear something with the laptop or the TunerPro RT setup is wrong.

dave w

I'm not sure what you're using to burn a chip but I got caught out years ago when using a Motes APU1, you can't burn a chip while the APU1 is connected to the vehicle. Once you disconnect the ribbon cable from the vehicles PCM the ZIF socket on the APU1 works for chip burning.

I’m using a Moates burner2

ok I just removed the chip adapter and installed the memcal. BOOM- connected. So I must have something in my settings in tunerpro wonky. When I uninstalled and re-installed the program it picked up exactly where it was. how can I get a fresh start?

ok question- when I put a chip into the burner 2 and hit "erase chip" it says operation successful, but when I hit blank check it says chip is NOT blank. if I load a file and prog the chip, then hit verify chip w/buffer it says FAILURE verification failed (not matched) I just tried a new chip from a friend and one of my chips all the same results.

MYSTERY SOLVED! I'm an idiot. On the burner 2 it says "notch toward handle" so I've been installing the chips all the way to the top. While the lower part of the burner clearly says (in very small print) CHIPS ALLIGNED WITH BOTTOM. So thank you for all the help. I went and re-tested, and to my not so surprise..it works.

ok I set the injector flow rate to 58 and I am still way lean, also it hunts for idle. This was a cold start.

Dave check the open loop afr vs. temp vs vacuum table values, in the other bin vs this one. I just changed them in this bin. I'll burn the chip and try it in the morning. The original values seemed very lean. I don't know if it is the cause of my lean open loop but it seemed like a good place to start

Tuning is mostly Trial and Error, your headed in the right direction by adjusting open loop afr vs. temp vs vacuum table to add more fuel during open loop. It's logical to expect changing a value in the open loop afr vs. temp vs vacuum table value from 15:1 to 14:1 will "add fuel".

dave w

ok I drove it today and datalogged it. I think this thing is lean all the way around. where would I start to add fuel across the board? I would think on a cold start warm up afr would want to stay between 12.5-13.5 ish. I changed a few things and got a more steady idle but it is very lean. Under a load it has a lean "pop" and then it tries to come back. Here is the log and the bin

correct me if I'm wrong. but I was thinking cold warm up afr should run a touch lean to help it warm up faster?

you could boost your bpw up and make sure your highest numbers on your VE tables don't add up to over 85