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Old 01-21-2010, 12:58 PM   #36
old_master
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Re: 96 GMC Jimmy black smoke, backfires, Timing?

You've replaced a ton of parts and spent a ton of money, and the problem is still there. Now would be the time to diagnose rather than guess. I am assuming that since you used a Duralast distributor cap, you most likely used an Airtex fuel pump, (Autozone sells both of those). The reason I suggest checking fuel pressure and leakdown is that Airtex fuel pumps are known to have low fuel pressure and leaky check valves.... right out of the box. Just because a part is new, is no guarantee that it's good.
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Last edited by old_master; 01-21-2010 at 04:38 PM.
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