Join Date: Apr 2002
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Re: Plug #5 in \'99 Jimmy
The #3 plug in the left bank is the plug hidden behind the steering shaft on the Vortec 4.3. Just jack up the front end @ the crossmember to achieve "suspension droop", and you can use a Craftsman 5/8" swivel plug socket with a 24" & 18" extensions, and the plug will come right out (from behind the shock mount plate). Wrap a small amount of electrical tape around the swivel joint on the socket and down around the first extension where it connects to the socket (this keeps the socket from being too floppy and also keeps the socket on the extension.
Always use antisieze compound on the plug threads, and install new plugs by hand. Use a piece of 3/8" fuel line about 8" long, with a little oil or grease rubbed into the end to install the new plugs (lubricant keeps plug from sticking inside fuel line). It keeps you from getting burned on hot exhaust manifolds, and makes it easier to thread in the plug on those hard-to-reach plug holes. I wouldn't use anything other than AC Rapidfire plugs unless you are going with an aftermarket ignition system. Don't buy Bosch or Autolite plugs because they're cheap... you'll be changing them out soon if you do.