I installed the Diablo 87 octane tune and my CEL came on. I flashed it back to my saved stock tune and it came on again, but I forgot to clear the codes. All I have on the car is a K&N intake and TB spacer.
The diagnostic said it was too lean.


Anybody else have this problem?

 

I had the same problem with my Diablo/C&L setup. Turns out I was installing the wrong tune. Make sure you are installing the K & N specific tune, probably under "custom tune".

 

Eh, K&N doesn't have a tune out for it yet.

 

After I got home today from work the CEL light came on again, I was furious. I decided to look under the hood and found my problem, whoops!

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I was putting ice on the intake last night at the track and I must have loosened it. It was pressed up against the coolant resevoir, that's what held it in place from falling off. The car was running okay though, that's weird. I hope I didn't cause any damage. The way the intake is attached to the throttle body is really weak I think.

 

I put the 87 tune back in, no more problems. When my tank runs out, I'll be switching higher. Is there an 93 tune for it or only 91 octane?

 

Cool. Glad you figured it out.