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| ECM upgrade (1227730) for stock 2.8 (Page 63/107) |
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Darth Fiero
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JUN 13, 06:13 AM
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| quote | Originally posted by Pyrthian:
ok, sounds good. I am pretty confident about the wiring, so - can I just take the whole coil pack assembly out, and take it somewhere for testing? is it possible that if I had the wrong chip - like for a distributer, or a 4 cyl with TBI - that it may have cooked the ignition module? the popped INJ fuses worries me also - but could that be from all 6 being on one line now, instead of the 2 seperate banks from the original Fiero ECM - beings it is a dbl load now? |
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A 4cyl chip will NOT cook the ignition module. I don't know if any parts stores or shops have the ability to test GM DIS ignition modules, they might -- you will have to check. All 6 injectors being on the same circuit should not have popped the fuse (unless you were running too small of a fuse -- should be 10 amp). If you are popping 10amp fuses, then you have a wiring problem or a bad injector (internal short). Not too much else it could be.
-ryan
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Pyrthian
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JUN 13, 10:07 AM
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| quote | Originally posted by Darth Fiero:
A 4cyl chip will NOT cook the ignition module. I don't know if any parts stores or shops have the ability to test GM DIS ignition modules, they might -- you will have to check. All 6 injectors being on the same circuit should not have popped the fuse (unless you were running too small of a fuse -- should be 10 amp). If you are popping 10amp fuses, then you have a wiring problem or a bad injector (internal short). Not too much else it could be.
-ryan
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the original fuses for INJ1 & INJ2 were 5 amp. I did replace them both with 10 amp, since I did remember which circuit was wired, INJ 1 or INJ2, and assumed a dbl load.
next - how do I test the crank sensor? only thing I can think of is an oscilliscope, and that I dont have. but, the crank sensor "twsited pair" is one part or the wiring I was not so confident about - maybe I"ll make a new one. I dont wanna just throw parts tho....but I dont think I have the equipment to test a single part of this, except continuity......
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Darth Fiero
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JUN 13, 02:23 PM
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| quote | Originally posted by Pyrthian:
the original fuses for INJ1 & INJ2 were 5 amp. I did replace them both with 10 amp, since I did remember which circuit was wired, INJ 1 or INJ2, and assumed a dbl load.
next - how do I test the crank sensor? only thing I can think of is an oscilliscope, and that I dont have. but, the crank sensor "twsited pair" is one part or the wiring I was not so confident about - maybe I"ll make a new one. I dont wanna just throw parts tho....but I dont think I have the equipment to test a single part of this, except continuity...... |
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Using an Oscilliscope is the only way to properly test the crank sensor.
You haven't used a test light to test anything having to do with the ECM or IGN Module, have you? If you have, that could have fried those components. You can only use a Digital Volt-Ohm Meter to test ECM-connected components.
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Pyrthian
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JUN 13, 02:27 PM
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| quote | Originally posted by Darth Fiero:
Using an Oscilliscope is the only way to properly test the crank sensor.
You haven't used a test light to test anything having to do with the ECM or IGN Module, have you? If you have, that could have fried those components. You can only use a Digital Volt-Ohm Meter to test ECM-connected components.
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damn...where to find an o-scope.....
no, the only thing I have checked is the power connection to the DIS block.
I guess I'll just go to the junk yard, and find a 2nd crank sender & DIS block.....and make a new twsited pair....hate to just throw parts - but dont see a alternative
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Pyrthian
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JUN 15, 02:30 PM
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yay spark. replaced crank trigger. after pulling the old one out, I saw it was just corrosion on the contacts. that sensor has remained on my block all along - but, never had anything plugged into it. still hasnt started yet - no fuel still. but, I do have pressure & spark. going over the wiring, section at a time from the injectors, back towards the ECM & +12. my multi meter pooped on me in the middle of testing  the "auto range" started not locking down, and it would just scroll thru the range searching.....so, back to checking when that's replaced....
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Pyrthian
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JUN 15, 06:24 PM
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well, got the new multimeter. I found that with igntion on, but not cranking, I was getting 8 volts going to the injectors - when there should be none. unplugged the ECM connector, and it immediatly shot to none/infinity - just to make sure it wasnt a leak in the wiring harness. sounds like the ECM injector driver is Poo Poo. when I touched the case of the ECM - it was HOT. guess this was why that particluar car was at the U-pull-it......
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Pyrthian
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JUN 16, 12:59 PM
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got another ECM for the U-pull-it. was from a vehcile that looked like it overheated - good sign for me - only way to overheat is to be running 
so, swapped it in - no change. spark, no fuel. and - I am very surprised at the voltage at the injectors when they are closed. digging a little more into it - I guess thats how it goes - there is voltage - but barely any current, so the injectors stay closed. now I see why these injectors drivers are so prone to fail - they "leak". so, now back to needing an O-scope to see if I am getting a signla from the igntion module to the ECM.
I got spark, I got fuel pressure, I got +12 to the injectors, and continuity back to the ECM. so - yes, sounds like the signal from igntion module to ECM is missing. how to test this...? but - the low bouncy tach - that means a signal is in fact coming out of the ignition module. hmmm....back to the notes...
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Pyrthian
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JUN 16, 01:44 PM
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| quote | Originally posted by Pyrthian:
hmmm....back to the notes... |
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and the answer found...got it started...injector grounds from ECM - oops - added them, and it fired right up.
did the cam break in - the rad fan kicked on twice under ECM control - yay
after the cam break-in - goosed the peddle a few times, idle dropped right down to solid smooth 600-700
no major leaks, no major smoke, except burnoff from the build.
woohoo!
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jimbuca
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JUN 20, 10:24 PM
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do you think this swap will make it bye the Evil California party poopers (smog test)
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jimbuca
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JUN 20, 10:27 PM
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do you think think this modif. will pass the California smog tests
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