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Installing a TPI system in my 85 Trans Am and trying to use a 16197427 ECM running $0D mask, with mixed results. When I can get it running, it is coming along pretty well. However, the cold starting process has been difficult, to say the least. If it doesn't start up right away, I'm pretty much stuck until the next day before trying again. Otherwise, it will crank and crank but not fire over. A couple of days ago, I had it idling GREAT after slightly advancing distributor - did not make any changes to the BIN as I wasn't able to get a timing light on it at the moment. Attempted to fire it up yesterday using the exact same program, and no dice. Before I advanced it slightly, distributor was set at 0 degree BTDC and Initial Spark Advance table was set to 0.0.
(All hardware changes to circuit board and chip jumpers is complete, as well as the flags and scalar changes in the program)
I'm running Bosch III injectors just in from SouthBay, fuel pressure is good at 43.5 (or factory level, took out my AFPR to remove another variable, running OEM FPR with new diaphragm). When it was idling smoothly, vacuum was rock solid at 14 - which seems a bit low to me, but not certain. Running a Comp Cams computer controlled camshaft option designed for the TPI system - forget the part number right now but have it written down.
For some reason, the long detailed log I recorded during Friday's great run will not load up and run. Bummer.
Hoping these screenshots can help anyone point me in the right direction. Been going through every thread I can find on $0D running TPI systems. I know it can be done, so I'm missing something vital somewhere.
As always, any assistance will be greatly appreciated!
Where did you get your voltage offset values from?
I'm away from the laptop with my TunerPro files on it, but I think I pulled those from somewhere on TGO. I've tried a few different ones.
I had initially installed a set of unknown Bosch III injectors and believe one of them wasn't fully operational. First round of getting the engine to run ended with a lot of gas dumped in the oil. Oil change and new filter now, and new injectors seem to work fine.
Where did you get your voltage offset values from?
Back with my laptop and dug through my notes. Your question already helped a TON, because I realized I had made a significant error when I inserted those values into that table.
The parts car I've been using is an 88 Trans Am with TPI. I had modified the wiring harness to run speed density instead of MAF, with the intentions of running the 7427 ECM. Knowing the critical nature of the Injector Offset vs Battery Voltage table, I took the table from the original 1227165 ECM and lowered it by 25% - a factor I'd read somewhere to adjust for the Bosch III vs. Multec injector efficiency.
THE PROBLEM: Looking at it now and tracking back the values, I realized I'd used an ABTR.bin ($32) file for an 88 with an $6E XDF file (89). That mismatch seriously screwed up the numbers.
One of the tables I'd saved is from a post you did a few years back (HERE) with an offset table. I believe I tried it earlier without luck, probably because I had other issues going on, like the leaking injector. Going to swap that table in and see how it goes.
Good progress today. I had to reset initial timing after I screwed around with the distributor. This time, set to 6 BDTC per service manual and updated the initial spark bias. Engine was running, but not great.
Realized all my crank fuel tables were still using TBI data. Pulled up my $8D files with the AUJP mods that have been done and saw where my multiplier per DRP was way off,likely causing too much fuel to be dumped in the cylinders. Also transferred the spark and VE tables to $0D. Car fired up right away! Falls on its face when I crack open the throttle blades, so something still messed up.
