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What is wrong if a 1986 Olds Delta 88 knocks and backfires at startup?
Wiki User
∙ 12y ago
Your timing is out of whack. Whats happening is the piston is still on its up stroke with the intake valve open when the combustion is starting. That's whats causing the knocking and backfiring. Does it only do this at startup? Does it run? You should get a timing light on her and fix the timing.
Did you just change the spark plugs recently and maybe got them in the wrong spot.If not,Could be mistaken,but believe the advance and retardation of timing is controlled electronicaly,and that unit runs about 200 dollars or more.
Wiki User
∙ 12y ago
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