Had a hard time starting it last week (very unusual). It ran a bit rough for a few seconds, then smoothed out. Everything seemed fine, but the service engine light stayed on, so I made an appointment to get it checked. Also, part way back to Michigan from Florida early last week, it seemed a tiny bit doggy but ran just fine. I chalked it up to imagination. Got 25.3 mpg for the 3200 mile trip, btw.
Anyway, got it to the dealer yesterday. They checked the codes & found the # 7 coil shorted & replaced it under warranty. I'm glad of that because the coils are $ 121.00 each! Anyway, the car's great now; more power than I can remember it having.
QUESTION - it ran fine with a shorted coil??? I'd think a shorted coil wouldn't work at all & I'd be driving on 7 cylinders, yet it ran smoothly. I guess it could have been partially shorted & giving a weak spark, but who knows. I wish I could have gotten the old coil so I ould check it with a meter, but they kept it since it was a warranty job.
What does the group think; partially or totally shorted?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dave Starr, Senior Shop Rat Emeritus: 14,647 days in a GM plant.
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