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Brought this up before like many here, but I don't think I realized how bad it was until just now. In early December I bought a 2007 IS250 and set the SC up for winter storage. I've been driving the IS for nearly 2 months now. Today, the roads cleared up so I brought out the SC to give it some exercise and noticed how much quicker the IS accelerates compared to the SC. The IS is a six-speed versus the five-speed in the SC, is that what makes the difference?
I definitely need to get that shift pressure mod done, but now I am wondering how much that will really improve it. This lag ruins a lot of the experience.
I found a blitz throttle controller but have not installed it yet. The 08 does not seem to have a large hesitation.
even less it I turn on the power part of the ECT. I think the torque converter is unlocked under no throttle input for a few seconds. Coasts. Small delay in throttle inputs results,
ECT in power mode the car slows versus coasts and responds faster to inputs.
the trans feels the same when I put the six speed shifter into the manual side. Torque converter locks up it seems.
Obviously different than what you are saying.
I guess thw blitz was more made for the early sc430's?
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Two ways that I know of. Pull the negative cable on the battery and wait about 15 minutes or pull the efi and etcs fuses in the box next to the battery. This will allow you to keep your radio presets vs. disconnecting the battery.
my experience with the sc430 is all it takes is disconnecting the battery. Then touching the cable leads together for about 30 seconds. This can probably be done through techstream, but I don't know that for a fact . Meaning resetting the adaptations. Some Other vehicles when doing the battery disconnect, it can take leaving it disconnected over night. Like my Land Rover, it takes over by the battery disconnect method. It can also be reset by the use of the Gap tool.
Im pretty sure this has been discussed before on here.
The easiest method to reset the ECU is to go through the procedure below:
If you want to reset the ECU without losing your seat and stereo settings, perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position (don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
The easiest method to reset the ECU is to go through the procedure below:
If you want to reset the ECU without losing your seat and stereo settings, perform the following procedure:
1. Get in your car and insert key. (It doesn't matter if you close the door or not.)
2. Turn the key to the on (not start) position.
3. Press the gas pedal to the floor.
4. Hold the pedal to the floor for five seconds, then turn the key back to the "off" position (don't remove the key), then release the gas pedal.
5. Wait 2 minutes.
6. Remove key.
7. Done
i second this post and it works! I never have the lag anymore. When I say lag, I mean driving down the road at 55mph and the car begins to slow down, you give it a little more gas and it speeds up only to slow down again. I go WOT and it seems to clear for a little while then comes back. it is random but it's gone now...about four months. Thanks Harold!!!
I think it may align the throttle position sensor, but not sure. I found it in the maintenance manual once but forgot what the procedure is called...I know pretty useless, right! ;-)
The throttle lag is something we discovered a long time ago that appears to be caused by the ECU learning how you drive and adapting the performance accordingly. Unfortunately, the "accordingly" part seems to have been written by the designers' grandmothers who want you to slow down. It's a real poorly written piece of code that should never have been done. If only we had access to it so we could patch it. (I know, real bad idea. Someone would muck it up real bad and someone would get hurt or die in a car crash. But at least the code could be removed or disabled.)
Hey Harold, I found the original post when you found it! You have had this one in your back pocket for many years!!!
BTW, I printed this procedure and it is in my glovebox!
Hey Harold, I found the original post when you found it! You have had this one in your back poster for many years!!!
BTW, I printed this procedure and it is in my glovebox!
Yep, I've been doing it for years. I bring it back up whenever I've noticed someone asking about it again on the forum. You'll see it in a fair number of threads because of that.
Thanks for the great reminder .I just reset mine and it feels like I put a turbo charger in it ! Well ............ maybe not quite but it really helps bring back the acceleration.
02-08-17, 05:51 PM
Throttle lag
