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Old 11-10-2015, 04:22 PM   #1
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Default Stumble at 6psi plus burbuling

I am trying to figure out whats causing a stumble in my cars above 6psi.
I have reduced timing to a level I think is really conservative but I am not sure.
I suspect the fab9 coils but maybe that's cause it was the last thing I changed.
I have good fuel pressure at idle.
I rechecked the timing with light.

When driving at low throttle its fine but when boost and rpm climb a little. It misses or stumbles I don't know if its knock almost feels like a rev limiter or something.
Please see msq timing map and log.

I appreciate all the help.
Attached Files
File Type: msl 2015-11-10_10.41.42.msl uptop issue.msl (85.4 KB, 35 views)
File Type: msq 2015-11-10_14.21.24.msq uptop stumble.msq (85.5 KB, 31 views)
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Old 11-12-2015, 01:38 AM   #2
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Can timing be too conservative. Seems like retarding the timing more just made it worse. I noticed with a timing light and it set fixed at 10 it still drops to like 6 at high rpm on timing light.
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Old 11-12-2015, 03:54 PM   #3
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So changed back to the 04 coils removed the fab9tuning cop which fixed the issue.

Last edited by 90 Turbo; 11-13-2015 at 10:18 AM.
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