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Old 01-13-2009, 06:20 AM   #791 (permalink)
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Cylinder deactivation. So there's nothing that could be easily used to setup (+nV on some input?) an if/else situation?

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Old 01-13-2009, 08:34 AM   #792 (permalink)
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Well, there are a couple unused pins. It is certainly doable. If you know which injectors get deactivated and which don't, you can sense one of each and compensate the display when you detect the deactivation.

In mpguino terms:
1. connect analog 1 to the deactivating injector.
2. add a pin change interrupt on analog 1 that sets a flag.
3. in the loop, make a copy of the flag then clear the original, if the copy is set then use a microsecondsPerGallon value that is increased by the percentage of cylinders that get deactivated. (or something like that), if half the cylinders get deactivated then double the microsecondsPerGallon used in the calculations.

Plus etc. etc. to make it a semi-comprehendable thing to use and performance etc.
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Old 01-13-2009, 09:04 AM   #793 (permalink)
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Cool, thanks!
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Old 01-21-2009, 04:59 PM   #794 (permalink)
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fuel injection specifics...?

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Old 01-21-2009, 05:00 PM   #795 (permalink)
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i know you need the fuel injection ground (low) input to get the correct signal, but on my car, it has a fuel injection ground for both banks. does it still read an accurate reading from just one bank or do i need to devise a way for both banks to be read?

specifics are the GM 1227730 ECM for a V6
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Old 01-21-2009, 09:19 PM   #796 (permalink)
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I take it this is for the Fiero. You just hook it up to one of the injector bank ground wires, does not matter which bank, each goes to a separate injector driver in the ECM. There is a main injector ground off the ECM, but it will not work. Considering that each bank goes to 3 cylinders, the other bank has to inject basically the same amount of fuel to complete the engine cycle. Ive hooked up the mpguino to 3 different GM V6s of this era, one of them a 2.8 MPFI. 0251500000 should be a good starting number for your microseconds/gallon. When I say high on fuel use in my fuel log, it is my own notes for how much above the theoretical 0240000000 based on injector specs only. Your results might be a bit different, considering the iron head MPFI 2.8 used a cold start injector. Im not sure exactly how much fuel it injects or for how long.
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Old 01-21-2009, 09:37 PM   #797 (permalink)
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yea its for the fiero. i know which injector wires to hook it up to.

were any of those V6's DIS? im sure your two A-bodies would be DIS if they are V6's. and you more than likely have the same ECM. the 1227730. if you do have 6's, look at the ECM plugs. if you see a yellow one and have DIS, then you have the 7730.

remember, i dont have the 2.8 though. i have a 3500 LX9 from a '06 malibu with the OBD I. and some 36# injectors with that walbro 255 fuel pump. major fuel being pushed. so i have a feeling that my uSec/Gal are going to be pretty different. not your typical GM V6 setup of that era.
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Old 01-21-2009, 09:50 PM   #798 (permalink)
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Ahh yes, now I do vaguely remember reading about your swap awhile back. Very cool. Yes your numbers would be way different.

All my a-bodies are DIS, they started that for 87. 85 and 86 used the Fiero engine (with different plenum of course). Im not sure about my ECM numbers or connector colors, and its much too cold to go look anytime soon.
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Old 01-22-2009, 10:03 PM   #799 (permalink)
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what does the EOC mean?
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Old 01-22-2009, 11:59 PM   #800 (permalink)
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EOC = Engine Off Coast... You can look at the glossary for a list of eco-acronyms and their discriptions

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