Stepper idle issues

Post by **jsmcortina** » Mon Jul 23, 2007 3:02 pm

Could someone please explain how you are testing stepper idle and what you expect it to do and what it actually does.

James

Ballistic · Post by **Ballistic** » Mon Jul 23, 2007 3:14 pm

It appears that it's not entering the desired crank position, but rather step 65.

It worked fine with 610b, but on starting with beta 6 the engine revved to 2000+ rpm. I needed to shift the idle step table ~50 steps higher for a reasonable idle.

I connected to a spare IAC motor and observed the pintle retracting on powering up, and it remained retracted on crank (it could have moved 65 steps w/o me being able to see this) and then extended a second or so after start. My observations corresponded with what I datalogged.

Does that answer your questions, James?

Post by **jsmcortina** » Mon Jul 23, 2007 3:37 pm

Could you confirm that it really was 0610b that worked ok? This was the first release _after_ I attempted to include idle code from 2.870. This makes it the most likely time to have broken the code ....

If 0610b does work ok, then it might make tracking down the problem easier.

James

Ballistic · Post by **Ballistic** » Mon Jul 23, 2007 4:04 pm

Yes, idle control worked perfectly fine with 610b. The minimum steps per move implementation worked well.

It was this version that I ran while trying to figure out what was happening with the ignition, and I had quite a bit of run time with it.

I did try beta 4 and since ignition wasn't fixed didn't run it, but did notice a lot of air noise on startup that was probably due to the same IAC behavior.

FiatFreak · Post by **FiatFreak** » Mon Jul 23, 2007 4:44 pm

I recently built a simple test stand to check the behavior of my IAC. It was just a block of wood with a large hole drilled out for the pintle. I then cut open the top half of the drilled hole so I could see the pintle move back and forth. You might try something similar just so you can make easy back-to-back comparisons between the two versions of code to make sure it is the code. I had very good response with my IAC for the longest time, and then it started acting really flaky. I did the mod where you jumper the two power resistors on the bottom side of the MS-II module, and then the IAC worked perfectly. Without the simple test stand I made, it would have made this troubleshooting task very difficult.

-Patrick-

Lordprimate · Post by **Lordprimate** » Mon Jul 23, 2007 8:50 pm

I Concurr....

I have been running 610b for a while now and the IAC works perfect ..

Maglin · Post by **Maglin** » Tue Jul 24, 2007 12:33 am

I'm running a Stepper IAC off the JimStim. Best way for me to see how it's working.

Post by **muythaibxr** » Tue Jul 24, 2007 2:58 pm

IF someone could send me a stepper motor to test with, I'll make sure that once it's fixed, it doesn't get broken again.

Ken

Post by **jsmcortina** » Tue Jul 24, 2007 3:51 pm

Ok, attached is an s19 to try out. It corrects what looked like a bug.

Even though I've tested all versions from 0610 to present, I'm having a hard time seeing what is right and wrong...

The file will need renaming as the forum doesn't allow .s19 files.

James

bstruble · Post by **bstruble** » Tue Jul 24, 2007 8:09 pm

It is the 4-pole GM stepper you need, right? Give me an address and I'll send you one with pigtail. We appreciate your efforts at this pesky problem!

Bill

Post by **muythaibxr** » Wed Jul 25, 2007 6:50 am

Has anyone tried the s19 James posted? I'm not doing another beta without someone who has a stepper trying this s19.

Ken

redmist1 · Post by **redmist1** » Wed Jul 25, 2007 6:58 am

Ditto. Thanks James.
Pete

redmist1 · Post by **redmist1** » Wed Jul 25, 2007 6:58 am

I'll be testing it tommorrow morning Ken. (4 pole Neioff Jeep stepper)
Pete

Post by **muythaibxr** » Wed Jul 25, 2007 7:42 am

Thanks. I just don't want to release another beta knowing that stepper is broken.

Ballistic · Post by **Ballistic** » Wed Jul 25, 2007 9:29 am

I'll get to it too, either later today or tomorrow.

Lordprimate · Post by **Lordprimate** » Wed Jul 25, 2007 9:41 am

If i could get to that laptop again today i will try it... If i do ill post up ....

in beta 6 ..(on my saturn) It is pretty crazy... my Last step was always around 208....

Now my last step is almost 300
probably has something to do with the bug...

Lordprimate · Post by **Lordprimate** » Wed Jul 25, 2007 11:54 am

Ok I am at my friends house,

on her laptop

flashed the new s19 file on the ms2

I didnt upload a msq I just went threw and updated all the settings manually..

at first startup it worked Perfectly...

Cranked
sparked
ran up 2k Rpm (165 steps)
and down to idle at 1000rpm (206 steps)

that was just the first startup ..

ill post later tonight after i get home from work....

Lordprimate · Post by **Lordprimate** » Wed Jul 25, 2007 12:25 pm

Ok, i just drove home... with the new S19 loaded

and it ran BEAUTIFULLY...

like i said on the first crank it started right up and idled down perfectly...

on the drive home i tinkered with my VE table a lil bit ..

pulled in the drive way ... idled perfectly at 1000rpm.. ( any lower i run into problems with my accessories comin on..)

Post by **muythaibxr** » Wed Jul 25, 2007 12:30 pm

OK so we have one confirmation, anyone else care to try it out?

Thanks,

Ken

redmist1 · Post by **redmist1** » Wed Jul 25, 2007 1:56 pm

I assume I can use the regular MSII downloader program to flash the s19 file, correct?..or do I have to use the DOS .bat file that I used for the beta firmware load.
Thanks
Pete