Green96
07-25-2017, 07:48 PM
To start off, some background info. About two years ago I was having an issue with a miss under load. Particularly if I tried to accelerate from 45 up to 60. It was recommended here that I replace the coils. I started to, but when I pulled the plugs out they were much more worn that I expected for the number of miles I had (copper plugs). I ended up doing plugs only and returning the coils. Miss gone..
What I was never entirely happy with was the way it still feels like it boggs down under load at that same speed range and does not want to downshift until I go nearly Wot.
I did some data logging tonight. I eased into the throttle at 45mph. My load went up to 74% and my my "spark" dropped as low as 8.75 degrees before it finally kicked down at somewhere around 70% throttle. Once it kicked down my spark came back up to around 15 degrees. When cruising with no load it was as high as 44 degrees at one point.
Is "spark" timing advance? If so 35-44 seams to far advanced and 8-10 under heavy load seams too low like the knock sensor might be retarding it.
Any thoughts?
I messed with the shift schedule on my old thunderbird back in the day when sct was allowing users to tweet a few things themselves. On that car the only thing I. The shift schedule was speed and throttle position. If that is still true I don't understand why it would not kick down. The tps log looked good. I am assuming that it is actually using a few other types of data to determine shifting points or it would be kicking down OK.
Sent from my BBA100-1 using Tapatalk
What I was never entirely happy with was the way it still feels like it boggs down under load at that same speed range and does not want to downshift until I go nearly Wot.
I did some data logging tonight. I eased into the throttle at 45mph. My load went up to 74% and my my "spark" dropped as low as 8.75 degrees before it finally kicked down at somewhere around 70% throttle. Once it kicked down my spark came back up to around 15 degrees. When cruising with no load it was as high as 44 degrees at one point.
Is "spark" timing advance? If so 35-44 seams to far advanced and 8-10 under heavy load seams too low like the knock sensor might be retarding it.
Any thoughts?
I messed with the shift schedule on my old thunderbird back in the day when sct was allowing users to tweet a few things themselves. On that car the only thing I. The shift schedule was speed and throttle position. If that is still true I don't understand why it would not kick down. The tps log looked good. I am assuming that it is actually using a few other types of data to determine shifting points or it would be kicking down OK.
Sent from my BBA100-1 using Tapatalk