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Thanks again for helping me solve this issue. I'll work with the DFCO ramp in and out rates to see if I can get any improvement, but it's basically good now. Joe

I implemented the last settings, but sometimes still get a backfire. It's milder than before. Watching the latest log, attached, I'm wondering why LTFT banks 1 and 2 are so different all of the...

Hi Mike, I think we're on the right track. All of your recommendations have been implemented. The attached log shows the same backfire pattern early in the drive, but not in the latter period. ...

I'll check that off the possibilities. Thanks. It will be tomorrow before I'll have a chance to work on the car again. Fingers crossed. Joe

You have me thinking about the possible missing sensor input causing it not to go into DFCO. I'm using an aftermarket tranny controller, but think that I have VSS going to the PCM, since I have...

I'll implement the changes you have suggested and let you know the result. I really appreciate the help.

Hi engineermike, Thanks for your feedback. As you suggested, I repolled supported parameters and rebuilt the list. Much improved. I see that the pedal is going to 0% now. Fuel, torque and spark...

Sorry for the delay in sending this. It's been raining here since our last communication. Attached is a short log file, with the car up to temp, showing the conditions during backfire. Thanks...

Any particular parameters you need in the log?

Wow! You made a lot of changes and most are way over my head. I just returned from a test drive and the backfire continues about as before. Any ideas? Thanks, Joe

Thanks! I'll give it a try this afternoon and let you know how it goes. Joe

Of course I should have included the tune file. Sorry 'bout that. Joe
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I have a 2012 Coyote with a Whipple SC in my '33 Ford Roadster. The power tune is fine (623 RHP), but I have sharp, uneven backfiring during throttle closed decel. DFCO is enabled with stock...

I have a 2012 Coyote with Whipple and 6R80 in a '33 Ford roadster. I'm using the PCM that came from the donor car for engine management, but I want use use a US Shift Quick 6 to control the 6R80...