I read somewhere (can't remember where) that when you test for spark, that the spark is supposed to be BLUE in color.

 

I just re-tested the spark on my EA81T and found (based on testing off of the wire for #3 cylinder) that the spark is YELLOW, with some blue mixed in.

 

Is this a bad spark? Does this mean my coil is bad?

 

If so, will the coil from a standard EA81 work, even though it's for a carby?

I think the turbo coils are different. I know on EA82s the turbos have a ignitor or something that attaches to the bracket on the coil and is wired into it. You might be able to use a N/A coil as long as you have that ignitor.

 

Someone else jump in and help me out

my spark is yellow... i put it down to dirty plug electrodes, its never caused me any problems such as misfire etc

Blue spark is best. Bright Yellow is still a good spark. If you get down into the dull Yellow or Orange colored spark, you could be getting into a problem. Could lead to miss-firing at times.

It is ground or charge and perfectly dirty (harmless).

I had an 87 turn blue after simply cleaning alternator, from yellow. If old coil hangs onto "clean" volt changes, it was obviously good. In extreme circumstances electrically, the main grounds aren't gaining enough dispersal and can do the same. Most often, not always, the coil either works or it doesn't. The "yellow" requires a damn near perfectly dirty electrical problem. Also changing plugs to , say, a bosch platinum helped a newer soob I run. Dirty flocks to the heat of the grounding plug (spark), It must be gathering someplace stagnite....sometimes never to leave the system, harmlessly. I even got "strange" advice to use the rear defrost a little more often, something to do with electrical cleaning due to its resistance needed to get warm, literally taking some invisible things out the window:cool: .