Erratic Datalogging

[Impaqt]

I'm running into a couple issues logging my 1988 Camaro Iroc-Z

Its a 305 TPI with a 700R4 Automatic. 1227165 ECM

First issue is that my TPS reading are wrong in Tunerpro RT. Closed throttle reads accurately at .54Volts, but as I ramp the pedal down, the highest reading I get is 1.33Volts.

i've Confirmed at the ECM that I am getting .54 to 4.18Volts.

It did this on the Stock ECM and Bin File ($32B Definition, 1227165_32b.xdf) AND on the new updated 89' Bin (APYM with 6E Definition and Expanded 6E XDF)

Other than the TPS reading, my numbers seemd accurate and consistant on the stock BIN.

Once I switched over to the 6E Bin, things got weirder.

As noted, TPS was still way off. .54-1.33V readings, but another problem presented itself. During datalogging, ALL of my numbers fluctuate, but the seem to change consistently.

For example, Prom ID bounces between D8F and 10D.
drastically.

Pretty sure Prom ID should be a constant number..... All my numbers seem to be doing this. I get my readings for a few seconds, then I get some default or static value that pops in... Its quite annoying.

In case it maters, I'm running a Macbook Pro17 running parallels, Downloaded and installed the drivers for the ALDU1 and BURN2 with no issues at all. burned a stock 27SF512 and then another 27SF512 with my modified APYM.BIN

Pop the stock BIN in and load up the 32B definition. Datalog fine.

Pop the APYM Bin in with the 6E Definition, Erratic readings.

I'm not getting any Errors when the fields switch to whatever they are switching too. I'm not getting many errors at all actually.

I've emailed Moates on the issue, Posted a thread on TGO as well... But hey, maybe I can learn a bit here as well.

heres a link to the TGO post that has a chunk of my log attached.. Tunerpro RT V5
http://www.thirdgen.org/techboard/posts ... ost17.html

Many thanks In advance

John

[Impaqt]

The erratic readings seem to have cleared themselves up somehow. COolant sensor reads 240.5 at startup and TPS still only shows a range of .54 to 1.33 though.

ANy ideas at all? I'm trying a new ECM next I guess...

[charlescrown]

Just wondering if your taking the reading static without the engine running. If you are try with the engine running (need to be quick for chance of over-revving) The reason I question is you may have a voltage drop and the best way to find it is under actual working conditions. Regards Dave

[Impaqt]

Just wondering if your taking the reading static without the engine running. If you are try with the engine running (need to be quick for chance of over-revving) The reason I question is you may have a voltage drop and the best way to find it is under actual working conditions. Regards Dave

Both. You could see that the TPS voltage never went above 1.3ish.

Its been solved though. I actually had a bad ECM.