I have been trying to figure this one out for a while no and still no luck. And I know it has to do with this portion of the tune.

While driving, if I exceed the RPM Higher than number I get deceleration that pulses about every second. It is not limited to any one car. I experience the same sensation in every single FD I have tuned so far. I have played with the numbers and in order to get around it I set the Higher than number to 5000 RPM. However, this does not stop this from happening, it wastes fuel. What I am seeing in the datalogs is that even though the throttle is completely closed, there is a blip in the TPS signal. This leads me to believe it is some sort of feedback that is ocurring somewhere in the system.

So far it looks exactly the same on 6 different FDs. 3 on the stock harness, 2 with RyWire Harnesses and One with a wire in 440D.

I would appreciate it if someone could shed some light on this.

Yes all are running v14 software and firmware.

 

I find it very hard to believe that out of over 200 views no one else has encountered this. Thanks for the help guys.

 

Have you submitted a ticket via Adaptronic's website? Tech support will respond within 24 hours (depending on what time you send sometimes faster due to their location). They do no always browse this section for support.

 

I'm confused. You're setting the RPM limit on the throttle over-run higher, which means that ONLY ABOVE that RPM is where it will cut fuel when you are off throttle.

1) Test TPS settings and recalibrate if it's off.

2) Set throttle over run to something like 1800 RPM and back on at 1700 RPM. This ensures that you'll be cutting fuel at anything over 1800 RPM once TPS = 0 or whatever your buffer is for TPS. I'd think 3% since we're dealing with an old, cable system

3) Check Over Run, Fuel Compensation Tables. I'll find the exact name in a minute. It's the table that says not to use over run if the vehicle is still warming up. You might have your warm up temp not set and it's ALWAYS injecting fuel to try and keep warming up. **Edit, Oh, it's just right here.**

 

RPM Higher than is the RPM you need to exceed before it will engage overrun on decel. The RPM lower is the RPM at which it turns fuel back on to keep it from shutting down and catch it to idle. I'm working on it with Shawn right now. Ill post more when we know more. He seems to think there is a ground loop problem but so far I did not see direct continuity from the sensor ground to chassis ground.

 

Shawn is the man. I'm talking with him right now about my fuel rail setup over Facebook. I think he's going to copy it for his FD, hahaha.

So I remember Andy talking about how certain grounds need to be common, others need to be on the engine block directly, etc etc. I bet you this one has to be grounded to the engine directly...

 

Andy came through for us. It was a product of having the serial input for the O2 sensor as well as an analog input still feeding the ECU a signal. He said that the analog input is designed to handle a 0-1 volt signal from the narrow band sensor and most widebands run on a 0-5 volt signal and this signal can bleed over to other sensors and cause this blip which will cause it to go in and out of Overrun.

Once I de-pinned the 3C O2 sensor input the problem completely went away.

Thanks again to Shawn and Andy for helping me keep my hair.