Testing ignition coil

[rmorton]

After researching vibrations during acceleration, a possible bad ignition coil seems to be a likely candidate. I can feel the vibration in the steering wheel and very obviously in the gas pedal, but it goes away when I punch it. The vibration is even present at idle with trans in park.

My question: is there a way to test the coils or do I just have to buy one at a time and guess at it?

[RJolly87]

http://www.pontiacbonnevilleclub.com/fo ... c1683.html

I would say if you want to guess at it, just replace all 3 with a set from Harofreak00

[Nocrank]

I have three that test perfect and worked perfect.

http://www.pontiacbonnevilleclub.com/fo ... 36904.html

[rmorton]

That's the link I was looking for!

I tested all mine:
Pack 1= .8 pri, 6.08 sec
Pack2= .8 pri, 6.20 sec
Pack 3= .8 pri, 6.29 sec

Compared to the L67 data for 95-99 (closest years) these are all within range. However the forward most wire post was quite rusty when i popped the wire off and I had a hard time even measuring it. After cleaning, the reading was easy. So perhaps the corroded post was causing resistance and contributing to the vibration? I will drive today and see if there is a difference.

[Nocrank]

Get some dielectric grease and put a dab on each spark plug boot. It will keep out moisture and ease installation and removal. If your coil has that much corrosion on it, it may be time for new plug wires, and some new plugs.

[DaMaroon]

I think its unlikely the car would run better when you punch it if it's a secondary ignition problem.

[rmorton]

There is no difference in the vibration after cleaning the coil pack posts.

I believe I might be fighting two issues. One seems to be engine related - slight bucking when under a load such as a hill. The other seems to be a rather constant vibration such as from tires (although the fronts are brand new).

I think the plugs and wires suggestion is my next step.