Exactly the same for me. 90% better, but still as little by of herky jerky some times. I think that I will try my old injectors that I cleaned in my ultrasonic bath and seafoam solution.the herky jerky was reduced by about 90%. I can still feel it slightly if I am looking for it, but under my normal driving style it's a non-issue.
From:To everyone out there with the Herky Jerky! I had the same issue many years ago. Believe it or not. What fixed this problem was to replace the 12v Battery. After much research. I have found out IMA only needs to detect 9v to start our engine! Any one got a smoke detector?
The consensus on the forum is that a G1 won't start if the 12 volt battery is below 10.5 volts. 10.5 volts is the minimum voltage spec for some of the control modules and below that level you will start getting various MILs.
I can't start my car! Anyway. Anyone who knows a 6 cell 12v lead acid battery providing only 10 volts has a bad cell!
Or it is a perfectly good battery that needs a charge. Or the residual loads (radio memory etc) ran the battery down if parked too long.
Here is where the issue comes in. When you stop the car the momentum inside the battery sets forward. The opposite happens while accelerating hard. Causing the "loose" cell to function as it should.
I've usually found that anything "loose" in the battery just shorts the cell out; sediment, deformed plates etc. And usually charging the battery does no good in that case. The IR will allow the voltage to rise above 10 volts but the battery can't maintain the higher voltage under even light loads.
And unless you had the car instrumented to read all the variables your reasoning is conjecture. I wonder what percentage of bad 12V batteries have a "loose cell" vs: being sulphated etc?
Considering there is a Memory in our NiMH Batteries.
(not to stray OT but...) If this is the case, then why do people deep discharge the IMA pack? The consensus (from the way I understand it) is it restores lost capacity from the constant 20% cut off-and that produces a memory effect. (I agree that ni-cad are much more prone to memory effect though).From:
Nickel Metal Hydride (NiMH) Handbook and Application Manual
Energizer Battery Manufacturing Inc. | 800-383-7323 (USA-CAN)
Nickel Metal Hydride Version: NiMH02.01
Again, this is no longer a concern. The issue of "memory" or voltage depression was a concern for many designers of devices, using nickel-cadmium batteries. In some applications where nickel-cadmium batteries are routinely partially discharged, a depression in the discharge voltage profile of approximately 150 mV per battery has been reported when the discharge extends from the routinely discharged to rarely discharged zones. While the severity of this problem in nickel-cadmium batteries is open to differing interpretations, the source of the effect is generally agreed to be in the structure of the cadmium electrode. With the elimination of cadmium in the nickel-metal hydride battery, memory is no longer a concern."
I'm more than sure that one of our battery vendors on the forum can explain all of this better than I can.(not to stray OT but...) If this is the case, then why do people deep discharge the IMA pack? The consensus (from the way I understand it) is it restores lost capacity from the constant 20% cut off-and that produces a memory effect. (I agree that ni-cad are much more prone to memory effect though).
This is simply incorrect with the 12 volt battery starting at 9 volts.Even with the engine off the BCM will notice a state of charge and the DC converter will turn on allowing a charge into the 12v battery regardless if the engine is on. since the 62 amps going into the battery is significant. it could take seconds to get the SOC to reach 10.5v.