Stumble at 6psi plus burbuling
11-10-2015, 03:22 PM
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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.
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.
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11-12-2015, 12:38 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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