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Check the coil, as that is where the spark comes from.
The 2005 Chevy Trailblazer has Coil-On-Plug ignition coils so there are 6 "coil packs". Each one is mounted on top of the spark plug.
Do you have C.O.P. ( coil on plug ) If so, under the coil.
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No. 2005 is link and coil. 1990 is leaf spring.
This is how I diagnosed my 5.4 liter coil packs, I isolated the cylinder that was misfiring and then took a know coil from a good cylinder and swapped with the suspected bad coil. When the misfire went to the specific cylinder I swapped, I replaced that coil. Note- It is advised to replace all coil packs if you can afford too! Summit and Stylin has Hi performance coils for the fraction of cost as a single cost of the dealer's price.
They are under the coil packs. The coil packs are near the valve covers, and go into the intake manifold.
How do I replace the heating coil in a 2006 Grand Caravan? I have no heat it only blows cold air.
It does have a coil pack. Its where all the spark plug wires all connect to on the top of the engine near the drivers side firewall.
On a 2005 Kia Sedona the coil packs are over the front 3 plugs. Wires go to the rear head.
each spark plug has its own ignition coil on top of the plug, like many current cars.
It should be a yellowwire on the igniton coil