Part Throttle Surging/Bucking
Thread Starter
Teching In
Joined: Jul 2003
Posts: 5
Likes: 0
From: Boise, ID - USA
Part Throttle Surging/Bucking Part throttle bucking...
I am having a hell of a time with the throttle transition area. When at light trottle say 15% @ 20mph, I back off just a bit and the bar bucks/surges.
The vacuum where this happens is around -20hg.
What I notices is during this transition the car goes from trim cell 2 to 21. Why is it jumping to 21? The LTFT at 2 are negative, while the LTFT at 21 are way positive (+10). My LTFT everywhere else is right on -4 to -8.
I tried lowering the IFR table from -15vac and above by 10% and saw no change.
Any ideas?
Vehicle Speed mph Throttle Position % % INJ. Pulse Width Avg. Bank 1 ms INJ. Pulse Width Avg. Bank 2 ms Short Term Fuel Trim Bank 1 % Short Term Fuel Trim Bank 2 % Long Term Fuel Trim Bank 1 % Long Term Fuel Trim Bank 2 % Injector Flow Rate g/sec Fuel Trim Cell
57 13 2.2 2.1 -0.8 -2.3 -1.6 -1.6 0.74 2
57 12 2 1.9 -1.6 -3.1 -1.6 -1.6 0.74 2
57 9 1.7 1.5 3.9 1.6 -1.6 -1.6 0.74 2
56 9 1.5 1.5 4.7 2.4 -1.6 -1.6 0.74 2
57 9 1.5 1.5 5.5 3.1 -1.6 -1.6 0.75 2
55 9 1.5 1.5 5.5 3.9 -1.6 -1.6 0.75 2
56 7 1.5 1.5 6.3 3.9 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.6 0 0 10.9 10.9 0.75 21
I am having a hell of a time with the throttle transition area. When at light trottle say 15% @ 20mph, I back off just a bit and the bar bucks/surges.
The vacuum where this happens is around -20hg.
What I notices is during this transition the car goes from trim cell 2 to 21. Why is it jumping to 21? The LTFT at 2 are negative, while the LTFT at 21 are way positive (+10). My LTFT everywhere else is right on -4 to -8.
I tried lowering the IFR table from -15vac and above by 10% and saw no change.
Any ideas?
Vehicle Speed mph Throttle Position % % INJ. Pulse Width Avg. Bank 1 ms INJ. Pulse Width Avg. Bank 2 ms Short Term Fuel Trim Bank 1 % Short Term Fuel Trim Bank 2 % Long Term Fuel Trim Bank 1 % Long Term Fuel Trim Bank 2 % Injector Flow Rate g/sec Fuel Trim Cell
57 13 2.2 2.1 -0.8 -2.3 -1.6 -1.6 0.74 2
57 12 2 1.9 -1.6 -3.1 -1.6 -1.6 0.74 2
57 9 1.7 1.5 3.9 1.6 -1.6 -1.6 0.74 2
56 9 1.5 1.5 4.7 2.4 -1.6 -1.6 0.74 2
57 9 1.5 1.5 5.5 3.1 -1.6 -1.6 0.75 2
55 9 1.5 1.5 5.5 3.9 -1.6 -1.6 0.75 2
56 7 1.5 1.5 6.3 3.9 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 -1.6 -1.6 0.75 2
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
55 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.5 0 0 10.9 10.9 0.75 21
54 7 1.5 1.6 0 0 10.9 10.9 0.75 21
