I am making progress, but it is slow. Some of you may know, the ECM was throwing a TPS code. I replaced the TPS and the pigtail, checked the wiring, and when all seemed good, Eli said send the ECM back to them for testing.

I have heard back from Accel. I had a nice talk with them. I have talked to Chris there who indicates a willingness to work with me and get me straight. The problems are still related to lack of documentation. I have made a few errors that are not warned about in the software or instructions. Maybe by the time I get this thing going, I can write their instructions. The TPS error code it was sending is because the TPS voltage was going below .2 volts. This particular GM TPS switch will go clear to zero, and thus send a code. Nowhere do they tell you to set your base adjustment so that the switch sends out more than .2 volts. It is simple to do by simply rotating the switch on its mounting.

What's confusing everyone is why it worked for about 5 minutes before it bleeped out. My hope is that it was right on the verge of throwing a code and went over the edge when it got warm. Chris seemed to think the voltage was controlled too well internally for that to happen. They will check it out for me, and see if it seems to be to factory specs.

At this point, with what I know now, I would set the TPS to put out maybe a minimum of .5 or .6. And if it still threw a code, I would at least know to sneak it up a little higher. But when I told Eli that it was throwing codes for the TPS he didn;'t know what to tell me to do, other than replace the TPS and harness. After that, he just said send it back in to them for testing. So there you go. Better documentation is clearly needed here. If this had been offered as advice in the manual, I would have had something to try before sending it back. I guess I need to document these things as I learn about them. I'll keep you posted. This is no longer Sam's sob story, but a chance for you guys to learn from my struggles. I will try to be honest, and give you the real story with all its bumps, and twists. I hope it doesn't depress you too much.
Sam

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I guess those of us that has messed with EFI all our lives dont think of something like this. It is a known fact to set the TPS to .05 & on some OEM systems its even higher. It needs to be there so there is room to read incase the throttle plate gets lowered/backed off. That way your sensor has the head room to see if it acures/changes . Thats the way it is. Sometimes the simplest things is what will get you. One more thing to chalk up to the learning curve I guess. Hummm, I wander how much this will effect the tune up when you reinstall it. May be a good thing.




Jess

On a GM based system you have to set the TPS voltage, on others you don't, the computer is smart enough to read the TPS voltage at start and set that as the throttle closed level.

It's all in the implementation and there are so many different ways that it's been done that it shows me the Accel setup was done by people that only do GM.

There are many ways to implement EFI and the slackers essentially repackage the GM setup and charge you a fortune for it. Personally, if I was to setup my own EFI kit I'd go with the Ford system simply because the aftermarket support for the OEM Ford EFI is huge. Google Tweecer as an example of what I mean.

teve