EFIDynoTuning Forum

Ok, hopefully one final question.

I have a wideband wired into the EGR pin on the ECU so as to enable data logging it. Thus, I changed EGR type switch value to "2". Is this correct? I saw some discussion in other threads that the address was wrong in the last version of A1C. Obviously this is a different strategy and xdf, but I wanted to verify setting that switch to 2 and data logging the wideband will work. Anyone verified this yet?

Yeah it's definitely wrong. Haven't had much time to try to find it yet.

no need in changing the switch just wire it up and unplug the egr connector and good to go

I may have found it at bc7d. You could also set the EGR ACT and ECT multipliers to 0 I suppose.

If bc7d is correct the address is ca0f in sub2 if you want to update the XDF

I believe the above is correct. I'm running A1C and I set EGR type [bc7d] to 1 and it smoothed my idle right out.

bc7d is the correct address for PFEHP in A1C

Ok, so set the EGR type switch to 0 side that's the stock SUB2 value and then unplug the connector and datalog away.

Just out of curiosity, the other thread said bc7e was actually for pspshp. What exactly is pspshp? I can't find it in the list of parameters. I'm wondering if the EGR type switch address being wrong was what was causing all the goofy idle issues in the previous tunes I've been running?

Then one more question. In my premium member tune, Decipha had the base spark table cranked way up, maxing out at 48 degrees at 4000 rpm and max load. The stock SUB2 table maxes out at 28 degrees and even cuts to 16 degrees on the highest load line of the table. I guess I'll start with the SUB2 value since that should be safe, but Decipha's tune never knocked, so I'm probably going to want to look at adding more timing. On the other hand, 48 degrees seems like an awful lot. For reference, I've got the engine set up with the fast burn efi head ~70 cc wedge/bathtub chambers de-shrouded around the valves, polished to a shine, and dished pistons zero-decked for a static compression ratio of about 8.8:1. Cam is a 264/222 single pattern, 110 lsa, .480 lift, solid flat tappet. No doubt I need more timing than the stock 28 degrees but 48 seems excessive. I'm wondering if there were a bunch of multipliers involved that kept it from ever getting that high.

Pspshp is "power steering pressure switch hardware present" and is at bc7e. Setting pfehp (bc7d) to 1 or 2 may help with your i6 but you would have to test and let us know.

Why would setting EGR type to 1 help? Type 1 is for dpfe. These old trucks all had sonic systems.

Also, my old tunes were all on the previous version of the A1C xdf, so they all had the wrong address, bc7e. That value was set to 1 in those tunes, I'm wondering if that caused the idle issues since the I6 trucks don't have a psps.

Sorry for the confusion, Only my 95 has sonic EGR. All my other trucks have the pintle sensor only. The psps only kicks idle up when steering is dead locked to prevent stalling afaik, so I don't see how that would cause the issue. Deleting EGR and not disabling the EGR in code can cause idle issues. I would do this to test.

1. Set pfehp bock to 0 (at pspshp address)
2. Update your pfehp parameter to bc7d
3. Set pfehp to 2