BISS (basic idle setup screw) or SAS (speed adjust screw) is located on the upper part of the throtle body - picture (from manual) is attached.

 

i was having the same idle code when i first used his tune. I just changes the Idle areas of the Mivec table back to stock. Then the problem went away, and i was back to ilding like normal

 

its back...

obviously increasing MIVEC causes it to occur, but my old car had no problems with that MIVEC map..

so i'm going to play with the BISS screw this weekend

ps my ISCSteps was 50 after a long drive this morning...

 

There is no reason to have advanced Mivec at idle. Why would you do this other then to get a lumpier idle?

I've had a ton of IX's through the shop and every single one I set to have no Mivec advance at idle and never throws this code.

 

my mivec table attached.

in answer to your question, I think its good to have a little MIVEC advance so that when you start advancing in high load/rpm the MIVEC cams are already halfway there...

i thought the cams had a slight delay (ie not instant)...

 

Try this and see if it helps:

 

Also, what is your idle set at?

 

stock...

 

right so i put my MIVEC back in - why? because I almost stalled off the line in traffic...

as far as I am concerned we need some mivec in these areas because it helps torque or whatever.

so i screwed my BISS in 1 full turn and my ISCsteps is no about 36... I didn't need to reset the ecu just went for a drive and it worked it out

lets hope I dont get the CEL nemore

 

Its wierd that you're getting this CEL. In all the fiddling I've done with MIVEC, I've never had a P0505 CEL. I think that's the case for most other people as well.

 

i think maybe my BISS was out of adjustment from the factory... just not enough to trigger the CEL for a stock tune..

 

I got this code for the first time tonight on an 05 VIII with stock cams and the ver 96530006 ROM swap (for the map switching ability). Fuel trims are fine, and I've tried higher and lower (stock) idle values with no success. I left the car running 8* of timing at idle because we simply ran out of time -- not sure if that'll help or not. I'm hoping that it's ignition related because he's running on plugs that have 40,000 miles on them and was getting ignition-like breakup at 26psi during the race gas tune.

Any other ideas if plugs and extra timing don't work?

ISC values are stock, as are the idle values at the moment.

 

what ISCSteps are you logging at idle?

 

I got that same code when I used a 96530006 on a 05.

I still have to swap my 05 over to this rom to see if I get the same code.

Could be an issue?

I do know the idle and ISC maps are different in the 96530006 compared to the 05 rom. I tried swapping the 05 idle/ISC values over with no luck.

 

Dave,

Instead of advancing mivec why not add more (1-2*) of timing at those load levels?

I have added more timing low down and find response to be alot better, but I do have HKS 272 cams.

SK