Tuning: 3500, 5-speed, 1227730, nAst1, Fiero GT

[robertisaar]

with DTC51 set, lots of things don't work as they should.

since you're emulating, change "PROM Mask ID (KKPGMID)" to AA

also, clear the codes either by removing power from the ECM for long enough or do it via tunerpro(may need to right-click on the toolbar and select "data acquisition send command" to allow), if the codes come back, then we'll deal with them.

also, what wideband controller are you using? if we know what the conversion is, tunerpro can display the actual AFR instead of volts.

[LZeppelin513]

I am using the PLX wideband controller: http://www.plxdevices.com/Installati...UsersGuide.pdf

[robertisaar]

ok, that's an easy one then...

know how to edit the ADX? if so, change the conversion for the corrosivity sensor to:

(X*0.0392156+10

and then WB AFR will be displayed. you could also change the name of the item if you want.

if you can't do this, LMK and i'll make the necessary modifications and upload it.

[LZeppelin513]

I swapped memcals and changed "PROM Mask ID (KKPGMID)" to AA. This got rid of DTC51.

I also edited the ADX and input that conversion. I THINK I did it correctly.

Changing f28 now has an effect on fueling. I ramped it up to 210 in order for the AFR to hang around 14.5. It starts and idles a bit better but still backfires like crazy with a blip of the throttle (This started after I swapped memcals and entered AA in KKPGMID, BEFORE and after changing the F28 value from 176 up to 210.)

I cleared the coades via tunerpro and it did clear the codes. I unhooked the battery cable also just for giggles.

It continues to trip DTC53. I cleared the code before the log so it would show what was occurring during error trip.

This log is after I warmed up the car. I started it. Let it idle a moment. Rev it a bit (massive backfiring) let it idle again, and then shut it off.

BTW, I have fuel pressure from FPR set at ~57 psi (It is bouncing around a bit)

[robertisaar]

odd.... i don't know why the code is set for 10.4 volts, a lot of the earlier calibrations are like that as well.... set it to 16.9(where the later ones are set) and that should clear that problem.

set "Minimum Double-Fire PW to Allow Double-Fire (KAPLH)" to .8mSec and "Double-Fire PW Drops Below This, Single-Fire Fueling (KAPLL)" to .7mSec, that will disable single-fire fueling which i still haven't gotten working 100% correct yet.

here's a problem: look at your TPS voltage: it never goes under ~11%, even though voltage goes down to ~.5 or so... i'm not sure what caused it, it may be related to DTC53. that can cause all kinds of idle issues.

but get the DTC53 setup correctly and assuming the ECM is in an easy to get to location, pull all 3 connectors for a few minutes, that will allow the ECM to readjust the TPS% value. if you have a habit of pressing the throttle either during key-on of key-off that may also cause this.

[LZeppelin513]

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[LZeppelin513]

Ok, I did everything you said. It runs better. The tps issue was also fixed. I was also able to bring the f28 value back down to 176 base on the AFR.

Now should I start messing with the 1st VE nAst1 table using the wideband data?

unrelated question:I unplugged my purge solenoid connector from the beginning because it was putting a voltage out as soon as key went into run and stated oscillating the solenoid (audible) and heating it up. I ohmed out the wires for the purge s. to the ECM and its connected correctly but is not functioning properly.

[robertisaar]

that's the next logical step, assuming you don't run into any knock.

GM released a few different versions of the CCP solenoids, most if not all of the ones that went to 3.1s were "normally open" meaning when no power is applied, the engine can suck air through them. most of, if not all of, the later ones were normally closed.

there is a switch in the flags section to tell the ECM which one you have.

and you mention something being odd with the TPS?

[LZeppelin513]

The tps is fine i didn't mean that. Also, you were right about ccs and that is fixed. Thanks much.

[LZeppelin513]

So, should i be matching the commanded "target afr" to actual by manipulating corrosponding VE value? Increase to richen, correct? It dies after about 10 sec of idling if i don't blip the throttle. Is this also fixed via VE table correction?

[robertisaar]

dying at idle MIGHT be VE related, but it could also be due to not having the IAC minimum learned. if you feel like disconnecting power from the ECM again, you could set the "Initial IAC Minimum Position after NVM Fail (KMNMPKA)" to something higher than the factory 8 steps.... try something like 20-25 in there.

assuming you're running totally in open loop, then yes, you'll want to match the wideband AFR to the target AFR. yes, increase VE values to add more fuel. if you want to get REAL technical, the "resolution" of the VE tables is in .39% increments. so if you set the number in the TP toolbox to .39 or -.39 and use the "offset" function, you can add/subtract it one step at a time.

[LZeppelin513]

Ok I'll try that.

I was just messing with f28 value and it doesn't seem to really affect much. I went all the way to 250 and it stayed around 13.5 afr. This was in open loop. That seems wrong to me. I also added 12 to the whole 400-2000 ve table and again not much change that I could tell.
?

[robertisaar]

assuming your emulator is actually applying these changes, you should see rather drastic effects with those kinds of changes.

[LZeppelin513]

I'll try again tomorrow. Something must not have been right then.

Thanks Robert, I really appreciate your help.

[LZeppelin513]

I am fairly certain that I am not able to adjust fuel delivery. Drastic changes to F28 and VE tables do not seem to make a change and it doesn't make a change according to the wideband. It continues to hover around 13.88.

I know that TP is uploading to the emulator correctly. For instance, When I set "Initial IAC Minimum Position after NVM Fail (KMNMPKA)," the new set value will appear in the data log stream.

Is there something that might be set incorrectly that won't allow fueling changes? I'm stumped.