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96 chevy pickup Z71 4 wheel drive miss fire on #6 plug.
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Big2959
Novice
Dec 28, 2008, 12:20 PM
Post #1 of 2
(1207 views)
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96 chevy pickup Z71 4 wheel drive miss fire on #6 plug.
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Replace plugs, wires, cap, rotor. Still gets service engine soon message. Number six miss fire. Runs smooth for awhile then start running rough. Computer shows only number 6 plug missing. Please help.
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Loren Champlain Sr
Veteran
/ Moderator
Dec 28, 2008, 12:43 PM
Post #2 of 2
(1206 views)
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Re: 96 chevy pickup Z71 4 wheel drive miss fire on #6 plug.
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Were you getting P0306 prior to replacing the secondary parts? Might pull #6 plug (third one back on the pass. side) and inspect for a broken porcelain or improper gap. Also, is it wet with fuel or oil? Might take a compression test while you've got the plug out. If all above is okay, could be an injector issue or a vacuum leak. I think the EGR valve may be installed on that intake runner? I would think if it were a vacuum leak, the O2 would pick it up and set a code, but maybe not.
Loren
SW Washington
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