Author Topic: coil resistance test; anyone know the ohms? (Read 4249 times)

TomO2UT · « **on:** July 23, 2007, 08:54:18 PM »

Does anyone know of a coil resistance (impedance) test? Does anyone know the ohms? I was told by a Roundel TSA rep there is no test for these coils. From a few forum posts here and PMs I heard to check the outer two pins: it should be under 0.8 ohms (about 0.3 or 0.4 up to 0.7 ohms). I get 1.0 to 0.9 on all four of my old coils. I tested a new Bremi coil and got 1.3 ohms. I was guessing I had a bad coil because of a bad intermittent engine misfire.

Vladi · « **Reply #1 on:** July 24, 2007, 04:54:50 AM »

Here ya go. Have phun.

sports.racer · « **Reply #2 on:** July 24, 2007, 12:14:21 PM »

According to that table your new one is no good either.

Measure the resistance of just your test leads and subtract that from the reading through the coil.

TomO2UT · « **Reply #3 on:** July 24, 2007, 09:23:15 PM »

Thanks guys, my meter was reading erratically below 1 ohm, so I bought another multimeter. While I'm at does anyone know what the spark plug wire and connector resistance should be? (Guess I need to buy yet another Bentley manual.)
I get 6.3 to 6.55 k Ohms on my 4 plug wires/connectors.