[Josh404677]

Hello everyone I'm new here. I have a tune file that was made up for a cammed with 19# injectors1996 f150 4.9l and when i upload it to my tweecer it won't start it just cranks. However if I upload the stock file that I pulled from the eec it'll start but runs like crap. Any idea why the new tune file won't start the truck but the oem file does? I can't get it to stay idling to set the timing so I'm constantly fighting myself with this thing. Thank yoi for any help you can offer.

[cgrey8]

You didn't mention if the engine runs the same with the stock tune in the TwEECer vs the EEC with no tuning device. If those are the same, then you can trust that the TwEECer is serving the stock tune correctly and you thus have identical behavior between the EEC using its internal ROM vs using the TwEECer which SHOULD be serving up the same content as the onboard ROM.

Once you've established that, I'd start datalogging to determine if what's making the engine unhappy is fuel. If it is, start adjusting fuel in any way you can to get the engine to run better. Once you can at least get it to idle, then you can diagnose other possible problems and get them resolved (e.g. ignition timing, vac leaks, exhaust leaks, etc).

From there, you can compare the two tunes and determine what exactly is different between them and gradually migrate over changes knowing you have a tune you can fall back on if you make a change that's detrimental or a step backwards.

Hopefully you are using BinaryEditor. If not, you might consider it since its ability to compare tunes is far better than what I remember CalEdit/CalCon were, even if that requires you buy BE and the def file for your EEC.

[Josh404677]

I'm using caledit and calcon I think its called. The truck will run with the tweecer off so it'll run of the eec and it'll also run off the eec file uploaded to the tweecer. So it appears the tune file I got from the tuner isn't working. So not sure if it's me or the software or what it is at this point. Thought maybe I timed the engine wrong and have it set to the exhaust steoke rather then compression by accident. But pretty sure I did it right because I don't think it'll even run if it was wrong. Idk.

[cgrey8]

If you were looking for a drop-in tune to just work, then yeah it sounds like what you got isn't fitting the bill. However that doesn't mean the entire tune is invalid. Many of the changes made might be absolutely the right thing. It's just a matter of finding out what changes made are NOT working well.

Now if the tuner that gave you the tune sold it as a write-it-and-forget-it experience, then that's obviously not what you received.

[JuiceSC]

Post both tunes.

[Josh404677]

That's what it was he's the creator of the tweecer. But their forum isn't really helping. They keep telling me to check things that don't make sense. Because if the stock works on the tweecer but his tune doesn't then it can't be the tweecer. But they keep telling me to clean the ports which I did 100 times. Here is the tune file. I have to wait to upload the file he gave me because he saved some personal info to it like my address address such.

Oem tune.CCF

Copy of the oem tune

(77.54 KiB) Downloaded 91 times

[Josh404677]

Here is the tuners tune.

tune001.CCF

(77.54 KiB) Downloaded 92 times

[JuiceSC]

What is your eec strategy code?

[Josh404677]

AGANF