any one tell me what the ohms should be and how to test the coil to see if its bad
Yes they do, and they are known for going bad.cookjer24 said:ok tried 3 different coils and no go have 12 volts at both terminals of coil when key is on so i'm thinking its a bad ecm becouse don't they controll the on off trigering of the coil.
He's right, it may not be grounded. Didnt think of thatphillip637 said:The ECM grounds to the firewall where it bolts up. Poor grounding there can cause it to fail. What I've done in the past is sand the firewall where it bolts down to bare metal to make sure it had a good ground. After that mine has lasted ever since. I went threw a good handful of the at one point
What do you mean? The dizzy doesn't ground the coil, and if you mean that it shouldn't be grounding the coil, how could that logically happen?hoov100 said:Check the dizzy and also check to see if the dizzy is grounding the coil.
Yea I'd go get another one. They should be in stock at your local parts store. And even if that's not the problem it's never a bad idea to have a spare one around.cookjer24 said:its grounded made sure of that. pretty sure it is stock from the factory back in 78 so its time for a new one.
X2.phillip637 said:Yea I'd go get another one. They should be in stock at your local parts store. And even if that's not the problem it's never a bad idea to have a spare one around.
Let me rephrase thatKThaxton said:What do you mean? The dizzy doesn't ground the coil, and if you mean that it shouldn't be grounding the coil, how could that logically happen?
Where is the dizzy getting 1.5 volts from?hoov100 said:Let me rephrase that
Make sure the dizzy is getting 1.5 volts and make sure the ignition module is grounding the coil.
i think what the OP is saying is that the ECM is failing to provide the grounding cycle for the coil. are these known coils that your are testing with?cookjer24 said:ok tried 3 different coils and no go have 12 volts at both terminals of coil when key is on so i'm thinking its a bad ecm becouse don't they controll the on off trigering of the coil.
the ecm controls the ground to the coil via a transistor thus eliminating points and a condensor. the dist. has a sensor that generates a reference timing signal for the ecm to do its magic.hoov100 said:Let me rephrase that
Make sure the dizzy is getting 1.5 volts and make sure the ignition module is grounding the coil.
So then why does my dizzy have 1.5v to the pickup when the ignition is on?KThaxton said:Where is the dizzy getting 1.5 volts from?
The distributor does not "get" any voltage (except the cap and rotor end). The magnetic pickup generates a very low voltage pulse signal to tell the module to fire the coil.