I'm having problems with a Lumina 3.1L engine. It's hard to crank and it stumbles badly under acceleration. I've changed plugs and wiresbut it didn't alleviate the situation.
I decided to test the coils. I've heard that you can put a plug in a sparkplug wire, attach the wire to a coil, turn the engine over and observe the spark (obviously a no brainer procedure). Accordingly, you should see A) no spark = bad coil B) "yellow" fire = bad coil or C) blue spark = good coil. (I would like to interject at this point that I realize it could be the Control module failing which is making the coil/s fail)
Can anyone confirm this quick test? Or, is this test a complete waste of time?
I decided to test the coils. I've heard that you can put a plug in a sparkplug wire, attach the wire to a coil, turn the engine over and observe the spark (obviously a no brainer procedure). Accordingly, you should see A) no spark = bad coil B) "yellow" fire = bad coil or C) blue spark = good coil. (I would like to interject at this point that I realize it could be the Control module failing which is making the coil/s fail)
Can anyone confirm this quick test? Or, is this test a complete waste of time?
Sep 10, 2006 at 6:52 AM