So close with my first tune. Have a couple of questions.

[beastmar]

So I just recently started getting into tuning my own 2003 cobra. I’ve done a lot of research and I think I have most of it down. The car runs great for the most part but I have some questions that I’m hoping some of you can help me with.

1) The biggest concern I have is that when I’m driving and let go of the throttle, after a couple of seconds the car will go into open loop and my afr gauge will go lean ~18.0. Why is this happening? Is this where I need to adjust my dashpot?

2) I get a check engine light for P0053 & sometimes P0059 will a company it. Are my 02 sensors done for? These were replaced not too long ago and I didn’t have this CEL come up.

3) How do I fix my hanging idle? I have the dragon throttle body and my idle likes to hang around 1500 RPM then after a while drop to 1100 - 1200 RPM.

Thanks everyone, any input is greatly appreciated.

 

[01yellercobra]

That's not open loop. That's Coasting Fuel Shut Off. When you coast the injectors shut off to save gas. You can turn it off in the tune.

 

[beastmar]

Oh ok. I was a little concerned with that. So this wouldn't cause any issues with hurting my motor if I kept it on?

 

[01yellercobra]

Oh ok. I was a little concerned with that. So this wouldn't cause any issues with hurting my motor if I kept it on?

No. Even the stock tune does it. I keep it on because I feel with it off the car doesn't engine brake as well.

 

[01yellercobra]

As for the hanging idle is it hanging while you roll to a stop? Or does it hang after you've stopped? Mine hangs at about 1100rpm until I stop. I'm ok with it like that.

 

[beastmar]

As for the hanging idle is it hanging while you roll to a stop? Or does it hang after you've stopped? Mine hangs at about 1100rpm until I stop. I'm ok with it like that.

It'll hang at about 1500 until I stop. When I stop it'll hang around 1200. I done some research and what I've got is that the dragon throttle body is known for doing that.

Someone had mentioned to drop my idle lbs/min down by 30%. Do you think this is correct? I wanted to ask before I tried.

Thanks!

 

[01yellercobra]

It'll hang at about 1500 until I stop. When I stop it'll hang around 1200. I done some research and what I've got is that the dragon throttle body is known for doing that.

Someone had mentioned to drop my idle lbs/min down by 30%. Do you think this is correct? I wanted to ask before I tried.

Thanks!

I would make sure it isn't the throttle body first. I haven't had to mess with anything in the idle tables on my set up.

I usually work in smaller chunks. 5-15% depending on what I'm adjusting.