ThunderCore-Ultra
ThunderCore-Ultra is an ignition boot line. At Restauco this page lists ThunderCore-Ultra coil boots, coil boot kits and spark plug boot kits, identified by their ThunderCore-Ultra part number.
The coil boot is the rubber boot that connects a coil-on-plug ignition coil to the spark plug. Over time heat and oil make it hard, cracked or carbon-tracked, and the spark jumps to ground instead of the plug. A new boot is often the cheapest fix for a misfire. Read each kit listing to see how many boots it includes.
From the shop: a misfire code tells you the cylinder, not the part. Pull the coil and look at the boot for cracks, burn marks or white tracking lines. If there is oil in the spark plug well, fix the valve cover or tube seal leak, or the new boot will fail too. If the misfire moves when you swap coils, the coil is the problem.
Boots depend on engine and coil design. Match the number on your old part, or confirm by year, make, model and engine, or send us your VIN.
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