Closing in on a problem

[jim_in_dorris]

No, the 10k resistor should not be used on $42 data logging.

[1great40]

Well, I finally got TP talking to my truck. It seems I had a com port problem but that's straightened out. The good news is that the IAC counts are about 10-13 in park but they barely go up at all, maybe to 15 in drive. Also the software is reporting that it's in closed loop operation, but the idle is open loop. What does that mean? Am I correct to assume that the computer cannot achieve target idle if the engine is operating in open loop idle mode? I'm going to need some help on how to log data that I can post up so minds greater than mine (almost anyone) can comment on it.

[jim_in_dorris]

Some bins are open loop idle, the go closed loop shortly after the vehicle starts moving. If the software says it's closed loop, then you are running a closed loop bin, better still. It should go closed loop when it warms up. to Data log, do this:
start your vehicle first.
1: in the Acquisition menu, choose start/stop data scan (ctrl F4)
2: to record, after starting a data scan, choose start recording from the same menu (Ctrl Alt Space)
3. to stop recording choose stop from the same menu (ctrl space)
4. name your log file
then you can upload it here to get looked at.

[1great40]

Thank you for the lesson Jim! I followed your instructions and I'm attaching my first data log!

[ony]

DO YOU HAVE THE CAPABLITY TO BURN YOUR OWN CHIPS"""?

[1great40]

Let me assure you,if I have ever burned a chip, it has been totally unintentional! No, I do not have the hardware or the expertise to program my own chips. Mark made me a chip, all i needed changed was the idle speed but it didn't work. That's what got me into TP. I thought that all it took to get the computer to control the idle was a correct minimum air setting, no pulses from the VSS and the engine to be operating in closed loop.

Right now I am using the stock PROM but I'm toying with the idea of installing Mark's modified prom and seeing what happens, since I have reset the minimum air setting. All I was originally looking for was to boost the idle speed a little

[jim_in_dorris]

1 Great40. You are WAY LEAN In dangerous territory at idle. What fuel pressure are you running? Your AFR is way out of whack. You are running almost 17.5 to 1 AFR. I am seeing rich lean cross counts, so your O2 sensor is swinging like it is supposed to. I don't know if that is an async bin, but you are in async mode at idle. Pull you plugs and check them. You may need to add fuel pressure as a first step in gettin your fuel close.

[1great40]

Thanks for finding that Jim. I will check the fuel pressure. I suppose that's why my BLM values seemed out of whack? Can you please explain async bin and and async idle mode.