Data logging with tuner pro and auto prom question

[MxRace75]

So I finally got around to trying to log some data on my truck and I have a couple questions.

First, it seems the data stream hz is pretty slow like 1hz. Is there anyway to increase this or is this all it's capable off.

Second when I Unplugged the data cable from the truck the idle speed changes and when I plug it back in it changes again. Is this normal?? Is there a sequence for hooking up the auto prom, cable, and computer?

Thanks for any help you can give me

[steveo]

you haven't really told us what your truck is, or what ecm it runs, so we'll have to guess

if it's TBI, then yes, it has a very slow data rate.

also if you have an ALDL cable and stuff changes when you plug it in, there's probably a jumper you have to take off.

[MxRace75]

My bad.

Its a 87 3/4 chevy 4x4. 350tbi 400 trans

1227747 ECM

Using tuner pro with the auto prom.

I know the auto prom has the switch for the 10k resistor which I have in the on position

[Six_Shooter]

Read my post above...

[MxRace75]

Read my post above...

ok. I will try to do some logging tomorrow after switching the switch. :-)

[3400tZ]

1hz is actually what the data stream rate should be for a '7747. And yes, that's slow as hell :D

[Six_Shooter]

The data rate should be higher, typically between 8 Hz and 11 Hz, in most cases I've seen.

As far as the idle speed change, you have one of the two switches set to 10K. When this is done, some ECMs will go into an "ALDL diagnostic mode" that is usually set with a higher idle speed, kinda as a way of confirming connection. This may also be related to your low data logging rate.