Good point ... and the sharp edges on that aluminum loves to eat o-rings.

Geez .. the magna rep should be shot for letting them leave all those sharp edges on it. I have scars from them.

 

Just use more LUBE!

 

Ya I have thought about Tex's opening of the intercooler, but that thing isn't too hard to seal up.

Either he is out tuning or he just went to bed Bueller...Bueller

 

It was bed time boys, 2 hours earlier for me.

Here is my base spark table. I'll make the suggested changes, but I didn't think I was flowing that much at idle.



I'll check the injector o-rings, they weren't lubes well. But thats a vac leak which should make a higher idle.

 

Lets not forget that I'm traveling 18 mph here. This is a normal decel coming to a stop sign. I hadn't applied the brake yet. Spark was fine at the time. Should it use base spark table at 18 mph? Lets look at the same thing almost 1 second later:



Timing is at 16*.
MAF is still 1.4x
Throttle position is up to 11%
RPMS are still falling hard - now at 242 rpms.
* at the point timing falls to 8*, rpms are 123 and its just about to die.


Somewhat ignore these trim values. I had just fixed the fuel regulator and also replaced a leaking header collector gasket. Trim values were off from those issues, and were quickly correcting themselves. You are seeing the first time the PCM hit trim cell 4 and 8 since the fixes, so trims were working themselves back in line at the time. O2 sensors are reading .800s, so we can assume its getting fuel.

 

It's going to use base spark when there is no throttle applied I believe.

 

I would change the 1200 column to 20* also. It's going to trasition up to 27 from 20 between 800 and 1200 rpms, which will make for a real abrupt change.

 

I noticed the 20-27 change too. Thats on my list of items to correct.

If thats the case, then when rpms drop, its going to pull from further down the grams/cyl column and bring in lower spark. I'll make that change to 20* all the way down, but I don't think its the cause of my issue.

Good info guys.

 

throttle cracker.

yes it uses base spark when 0% tps is commanded.

 

Update?