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  1. Yes, the diagram shows A10 being used while the...

    Yes, the diagram shows A10 being used while the more generic pcm pinout shows it unpopulated. In some cases when this happens both pins are connected internally so it probably won't hurt to use an...
  2. You've got a nice chart with great notes for...

    You've got a nice chart with great notes for reference. I like it.

    When doing an ecm swap I used to find muself checking and rechecking "from" and "to" columns. This was made more difficult...
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    The first time I experienced something like this...

    The first time I experienced something like this was in a shop heading toward the overhead door. A quick snap of the throttle and immediate brake apply was usually enough to cause tire chirp to...
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    If they tell you the injectors are fine...?

    If they tell you the injectors are fine...?
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    There are only a few things that could cause...

    There are only a few things that could cause repeated injector failure. Excess current through the injector could be an issue. If the ecm isn't limiting current when the injector is opened the...
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    I have nothing with that OS number but I have...

    I have nothing with that OS number but I have several different OBDII LT1 OS's.

    I have a '97 with 16257678.
    I have a '97 WS6 with 16258816.
    I have a '97 Formula with 16236222.
    I have a '96...
  7. Lotsa flat roads in your area? I have a friend...

    Lotsa flat roads in your area? I have a friend in Nebraska and another on OK that report getting very high mpg results and I believe it's the long, flat stretches. Trying to duplicate that tuning...
  8. Understood. The price of an aftermarket...

    Understood. The price of an aftermarket regulator can be quite high.
  9. Would it make sense to wire in the electric pump...

    Would it make sense to wire in the electric pump now and use it to feed the carb?
  10. This doesn't usually work well. There is usually...

    This doesn't usually work well. There is usually too much restriction in the flow path for the mechanical pump to supply enough fuel. YMMV.
  11. Yes, there are many eccentricities in the code...

    Yes, there are many eccentricities in the code that can trip us up. I believe this was done to save time. By performing more of the spark math with 8 bit instructions the processor gets through the...
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    The alarm values cause the software to provide a...

    The alarm values cause the software to provide a warning. If you'd like to prevent the warnings you can adjust the alarm low.
  13. It might help to think of this as a math problem....

    It might help to think of this as a math problem. The computer subtracts the main spark bias from the table numbers. When you change the main bias it affects the entire main table.

    This is...
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    Hi, I apologize for missing this question. ...

    Hi,

    I apologize for missing this question.

    In the right side of the picture, below the box with the formula, you must check "signed" to indicate to the computer it should interpret the data as...
  15. Hello and welcome to the forum. There are a...

    Hello and welcome to the forum.

    There are a couple of easy answers to provide, and possibly some discussion points as well. I'm going to change the order of some of the comment/questions.

    ...
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    First test, and best. Key off for 30 seconds or...

    First test, and best. Key off for 30 seconds or more. Then turn key on but do not start car. CEL shoould light for 5-10 seconds, turn off for several seconds, then turn on and stay on. If this...
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    I will keep that in mind for the future. I had...

    I will keep that in mind for the future. I had received a couple of PM's asking about the failures so I thought I'd describe the issues.



    Ahh... I have a great relationship with several auto...
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    I've changed far too many GM pumps over the...

    I've changed far too many GM pumps over the years. This seems to have gotten better but back in the days of TBI and TPI and through the L31 they'd often fail with 100k to 120k. I found some...
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    I'm the same way. It's a good deal and it makes...

    I'm the same way. It's a good deal and it makes sense to get it. Problem is when I go to put those things away I'm surprised to find one or two already on the shelf.
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    My first two EFI systems cost me $200 but had to...

    My first two EFI systems cost me $200 but had to jump in the dumpster to remove a bunch of parts. One was an '83 Crossfire (the manifold is on my pickup) and the other was TPI. I spent years asking...
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    I am using an older OS. I occasionally need to...

    I am using an older OS. I occasionally need to delete a pile of com ports created each time I connect my USB cable.
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    The ecm generally is not involved in controlling...

    The ecm generally is not involved in controlling timing below 450 rpm. In order to retard spark timing during crank one would set the timing with a base angle of less than zero degrees. The...
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    If you have a C3 computer like a 7747 which has...

    If you have a C3 computer like a 7747 which has two separate chips inside you need to use an ESC module. The ESC module is designed to tune the knock sensor to the engine. I would *guess* the 4.3...
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    Sorry... I have a strange sense of humor. ...

    Sorry... I have a strange sense of humor.



    Mark was a great help to many. The fact that people are willing to stick around after they complete their project to help a few that are just...
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    Hello. Welcome back. That's a classic cam...

    Hello. Welcome back.

    That's a classic cam grind referred to as the "350/350" cam. That cam was popular for many years. The chances of that cam running are very good. I'm running a similar cam ...
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