Originally Posted by opensourceguy
Do you have a tach? If the everything up to the coils is working [ICM included], the tach will jump around when cranking [usually about 400RPM]. If something before the ICM is bad [crank sensor, ICM, or wiring], then the tach will not work when cranking. If you don't have a tach, there really isn't an easy way to tell, other than just checking for spark at the plug. You can test coils by checking resistance but i really don't remember how, or what resistance equals bad coil. I'm sure someone knows.
MFB is right... one bad coil won't prevent the car from starting... btw.
Thankis for everyone'* replies, they are all very much appreciated.
I think opensourceguy has hit the nail on the head here. I do have a tach and it is not dancing around like it should.
I first noticed the car acting up when I would drive to the convience store around the corner, (engine wouldnt be hot) and come back out and it would jsut turn over and over and not crank up. I could sit there for a few seconds and try it again, and it would fire right up. It wouldnt do it everytime I turned the car off cold and tried to start it back up, just everyonce in while. Then about a month later, it just would fire up at all.
I thought it was my mag coil pack so I went and bought a new one. It still did not crank up, so I took the new one back and put my old mag back on there.
A mechanic buddy brought over a little diagnostic machine and after we chased down why the service engine light wasnt working and sunsequently put a bulb in the open recepticle :/ , it didnt tell him what was wrong, i presume because we couldnt get it running. The diagnostic machine had an electronic rpm gauge at the top, that he says revs up as the engine turns over...and mine wasnt doing this, so he determined it was the crankshaft position sensor, which we carefully replaced, and still no fixy car. >:(
About this time, we noticed one of the mag coils was hot so I took off the coil pack and noticed the blue gummy sealer that covers the computer stuff was all melted on the ICM. Here is a photo of the melted ICM on the left compared to one from an unknown model. (the harness plug is different and it is a little taller)
The melted ICM wasnt quite this bad, I dug some of the silicon type stuff to see what exactly was in there, since it was obviously broke.
After all this I decided to buy a delco ICM and pack kit from BillBoost and this is where Im at.
Im sorry this is so long and sortof repeats my other thread, but I am trying to give you every detail to pinpoint the problem. I dont know where to look now, so I need help badly.
So to answer your question OSG, no the tach isnt reading anythig while cranking.
I am also gettting 12 volts to the delco ICM when I turn the to the on position.
Sorry for the grammar mistakes. I just got home from a long day at work and its all I can do to make this legible.