I wanted to followup on the post and get your thoughts about some of my findings thus far.
*Note: the weather hasn't been cold enough to recreate the issue since the last post.
Following your suggestion I used the service manual to find the parameters for testing the ignition coil since I was leaning away from it being a fuel mixture problem. I got the following readings from the coil tests:
Resistance between A & B terminals = 1.3 ohms (spec should be between.68-.77 ohms which is out of spec)
Resistance between A & Secondary terminal = 15.9k ohms (spec should be between 12-19 ohms which is in spec)
However, at the time of the testing I got a temperature reading of 90 degrees from the metal portion of the distributor housing and the manual suggests that the optimum temperature for testing the coil itself should be at an ambient 68 degrees. Do you think the slight increase in temperature would cause the one reading to be out but the other remain in? Do you think the out of spec reading is accurate therefore rule that the coil (likely being under-powered) is the issue?
Also, while reading through the service manual I found a section dedicated to the ECT. It says that this sensor on this model is the on/off type in that once the coolant temperature reaches 100 degrees it closes the circuit and suggests a warm engine mixture. That would lead me to believe a way to rule out a defect in this component would be to disconnect it when the issue occurs forcing the ECM to see a cold reading. Would you agree this would be a way to eliminate this component from the problem?
Thursday, January 14th, 2010 AT 8:24 AM