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Old 04-09-2014, 10:33 PM   #1
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Default Fluctuating idle due to Open Header and no intake?

I cant get the idle to settle, it fluctuates wildly. I checked Tuning idle with MegaSquirt

I double checked my timing and it is fine (at 10*).
I was under the understanding that the stock fuel/spark tables in TS were fine for a Miata.

My main concern. I am running an open Raceland header at the moment with the wideband in the header. I cannot change that until I get the thing running to get it to a shop. Evidently, the 94-97 header does not match the 94-97 cat, but that is a different story.
I am also waiting on my intake tubing so the IAT is reading ambient temp which I would think would be fine since it is open air at this point (I know not a good idea, but it is in the garage and not dusty.

Would either of these cause the idle issue? The wideband fluctuates from about 12- off the gauge as it is fighting to run.

I am posting my MSQ and composite log. (Keep in mind that these are stock TS except the few setting that I have changed. I cannot find a compatible tune for a NON PNP that anyone is willing to share...LOL)
(I just added the ICV settigns and have not tried it, I had the crazy buzzing noise as well earlier so I disabled it, now I have added it and changed to 511hz)
Engine is a 2003, naturally aspirated, 99 intake...
MS3/MSx on latest software and firmware

Thanks,
Mike
Attached Files
File Type: msq 2014-04-09 2003 Miata NA.msq (223.6 KB, 23 views)
File Type: csv 2014-04-09_20.15.40.csv (200.8 KB, 22 views)
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Old 04-10-2014, 08:59 AM   #2
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if you tune it rich (can't go off wideband), it will smooth out.
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Old 04-10-2014, 09:33 AM   #3
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Quote:
Originally Posted by Braineack View Post
if you tune it rich (can't go off wideband), it will smooth out.
I have little to no clue what you mean.
I understand that you are saying that I need to richen up my fuel map but are you saying to ignore the wideband?
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Old 04-10-2014, 12:51 PM   #4
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how far is your wbo2 from the end of the header?

hoenstly, the open header shouldn't affect one thing.
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Old 04-10-2014, 02:48 PM   #5
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Quote:
Originally Posted by Braineack View Post
how far is your wbo2 from the end of the header?

honestly, the open header shouldn't affect one thing.
Probably 8 inches or so
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Old 04-10-2014, 03:08 PM   #6
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yeah, that's going to fubar your readings.
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