nope

 

I tried to change the values. I will change it to 162.5 but when I enter that number on mine it shows 164. Maybe could be the way I am entering it?

 

i think you may have a definition problem.

 

Its seems to me that the axis are wrong. I'm sure one of these has to be ECT, due to cold start emission requirements which use ECT as an axis, but the load axis seems to be off from what i'm seeing in datalogs.

For instance, at 2byte load of 30(@1000rpm) and normal operating ECT, i should be seeing a step of 51, what i'm actually seeing correlates to something different, or the scaling for load is off(which is more likely). It seems that the scaling is off by about two cells.

If this table worked the way it would seem, then you should have higher steppings for cooler ECT's, which in this case they are all the same, no matter what the temp. Not to mention the fact that even if you change just the 41deg column, it changes all of the cold start steps as well, which SHOULD correlate to the columns less than 41deg(i.e. -32-34deg)...but, again...these values are not changing by temp, but rather, load. Maybe the two are reveresed in the deffinition? I'm not good with code...someone who is should help explain either way.

MAybe i'm missing something?

BTW, i'm trying to figure out a liftoff surge issue with my new BC 280's. When i liftoff the throttle at partial throttle areas, the injectors overrun and cause RPMs to steady for a sec(surge) then the injectors shutoff, allowing the engine to engine brake normally. It does it everytime with these cams. I know the ISCV is to blame and the stepper table lookup seems promising, but i don't think it's correct currently. I also had a rpm hang issue as well, but i have got most of that tuned out.

Thanks!

CJ

 

2006 IX MR - bone stock, experienced it with both 88590014 and 88590015.

Mine has done it since I took delivery and it doesn't matter if it's under boost or vacuum. Cruise at a steady state RPM and when you go for the offramp and push the clutch in, the RPMs hang and then very slowly drop.

Clutch action doesn't seem to affect it with the exception of engaging the clutch in gear to pull the revs down.

It took some getting used to and was initially a bit frightening as the car stays "on throttle" when I lift - it's, quite literally, like a cable throttle with a sticky cable.

Now that you're in TX, you're welcome to drive or ride along in mine to see what we're on about. Your first thought will probably be like mine: "Oooohhh, that's not good."

It's a bit spooky and not fun on the track.

I'd be glad to log anything needed since my car is stock but it looks like others have it covered already.

 

could it be MIVEC. as you get into the high load, high RPM, the mivec approaches 0 or is 0. So when you let off the gas on the map its higher near 24-28. So this means more input air because of the more overlap right?

 

i am getting lost in this, who knows of a decent tuner that can fix this for me (southeast)

pk

 

If it is indeed ECU code, we can modify it.

If it is mechanical such as a vac line disconnected, you will have to address it.

www.ttp-engineering.com/store

 

To me it feels like the car is not cutting the injectors upon lift after high load. Then at 3000 the car cuts the fuel and then kicks back in at 1400 or so rpm's to settle the car down to an idle. If it would cut the fuel after lifting at high load everything would feel normal. I don't think it has anything to do with the ICS. Just unplug it and you'll see the problem still exists.

Also I've turned the ignition key off during deceleration when we are having this problem and the car engine brakes normally.

 

I tried this mod and although it helped, I still have some throttle hang. It was not an issue until I put WORKS apeture II throttle body on, I think the larger area makes the car more senstive to hang. I did have hang enough for the car to feel like it was being pushed at worse case.

Now it feel like the normal hang it had when stock.

 

Mine used to do it, Once I got tuned it stopped for months. Recently after getting my lean spool adjusted & adding the GM 3port it started again. Its definetely SOMETHING in the MAP. Now I just have to find out what it is.

 

"this mod" meaning what? the maps evo kid posted (the one with zeros at the far right)?

 

throttle hang GONE!!

thanks: touringbubble and evo kid, appreciate all your efforts and help.

 

Just to let you guys know, I tired something similar to this when testing some things to help rovanpera's issue. With the downward sloping map I had some issues with the engine revving up about 500 RPM when the clutch was depressed coming to a stop.

Imagine a stop and go traffic situation ... you are in 1st gear going very slowly. You accelerate up to about 5 mph and have to stop again. When you press the clutch to shift to neutral and stop, the engine revs up a few hundred RPM.

I didn't slop down as drastically as the example map ... only from 58 to about 32 or so at the bottom of the map.

 

I am still on the stock idle table and my car revs up a couple hundred rpm in the same scenario. I thought it was normal. I think my sentra does the same thing too.