Mark;

 

It’s great that this has have resolved the occasional misses for you.  It’s very puzzling to me that my engine (and apparently many others) has always run smooth at any condition over about 1500 rpm with the same controller and the D580 coils. Has this only been an issue with the P-port?

Al

Do these coils have circuitry installed so as to run on low voltage? Has anyone tested the various models on a scope to see the output? Peak voltage and burn time?

 

Anything used in a car or truck has had every extra penny removed from it before you see it. It will perform to the lowest possible standard. A very high percentage will fail just outside the warrantee period. GM is really good at this. We raced against Ford Probe owned by a drive line engineer for GM and were told us that he was nearly alone in his division, and that drive line vibration problems were solved by engineers in India.

 

The instant GM figures out how to run an engine with no ignition system you will never see one again. GM did not go out of business because they produced too high a quality equipment. 

 

Last year I sold my GMC 427 Crewcab towing vehicle for pennies at our yard sale.. It had its 3rd GM paint job blow off into the wind. And, it left on a rollback because the 4th set of Chinese brake lines had vanished in a cloud of rust dust. GM put on three sets and the American motorcycle museum put on a set. DID GM care about who I ran into when the brake lines failed? Not at all. They have two cost curves crossing on a graph, and when losses from law suites get higher than savings from Chinese parts, then they will care. But not now that its Government motors. Your coils were designed by electrical engineers, Lawyers, you,  the elected officials of the united states, and an army of brainless tree huggers. And still there is a misfire?

Seems impossible.

 

But I could be completely wrong.

 

Lynn E. Hanover