okay guys, I´ve got a 1991 escort GT and my tach isn´t working. The thing is, it works SOMETIMES... usually it wont work, but every once in a while when I´m driving, it will kick back in.
Okay, I don´t know exactly how everything is hooked up, but I´ve pretty much torn down half of my dash and console and pulled apart a good portion of the right side of the engine bay looking for the problem and found nothing.
Here´s what I have done thus far:
1.Checked the diagnostic module for any corrosion. Checked out AOK.
2.Checked the ignition coil for damage/corrosion- checked out AOK.
3.Checked the ignition module for corrosion/damage- looks fine from the outside, but I´m suspicious about whether or not it´s working. I don´t know exactly what its function is.
4.Checked out tach cluster. Checked out AOK with no corrosion and all connection points clean and contacted.
5.Checked out ECU- NOT SURE. Looks fine from the outside, but I most of the time the "check engine" idiot light is on in my cluster, and I have a feeling that this is the reason why my tach may not be working, because my EDU is about to shit the bed.
Here is a diagram of the ignition system and tachometer:
CAN SOMEBODY EXPLAIN EXACTLY HOW THE TACH WORKS AND WHAT YOU THINK WENT WRONG??
This baffles me because all the parts and wires appear to be in-tact and with no rust or corrosion. I think the ECU went bad, but from the diagram, it seems like the ECU may have nothing to do wit the tach.
ANY HELP IS GREATLY APPRECIATED. thanks in advance.
Okay, I don´t know exactly how everything is hooked up, but I´ve pretty much torn down half of my dash and console and pulled apart a good portion of the right side of the engine bay looking for the problem and found nothing.
Here´s what I have done thus far:
1.Checked the diagnostic module for any corrosion. Checked out AOK.
2.Checked the ignition coil for damage/corrosion- checked out AOK.
3.Checked the ignition module for corrosion/damage- looks fine from the outside, but I´m suspicious about whether or not it´s working. I don´t know exactly what its function is.
4.Checked out tach cluster. Checked out AOK with no corrosion and all connection points clean and contacted.
5.Checked out ECU- NOT SURE. Looks fine from the outside, but I most of the time the "check engine" idiot light is on in my cluster, and I have a feeling that this is the reason why my tach may not be working, because my EDU is about to shit the bed.
Here is a diagram of the ignition system and tachometer:

CAN SOMEBODY EXPLAIN EXACTLY HOW THE TACH WORKS AND WHAT YOU THINK WENT WRONG??
This baffles me because all the parts and wires appear to be in-tact and with no rust or corrosion. I think the ECU went bad, but from the diagram, it seems like the ECU may have nothing to do wit the tach.
ANY HELP IS GREATLY APPRECIATED. thanks in advance.