Question about 2001 Ford Ranger Regular Cab

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I have changed my plugs and wires and think I have a miss. I am trying to figure out what to do next.

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Did you make sure the new plugs are gapped correctly? Some come pre-gapped from the manufacturer but not all of them will. Also, be sure the wires are fully snapped onto the boots so you don't get any arcing that can degrade the spark in the cylinder.

Check the cap and rotor (follow the spark wires from the plugs to the other end - they're attached to the cap). Remove the cap and inspect the rotor - it's the metal arm underneath. The edge should be corrugated like the end of a quarter. If it's not, replace it. Also, the cap has contact points on the underside, corresponding to each spark wire. One or more of them may be worn or corroded. Use electrical contact cleaner and a wire brush to scrub them down, and if that doesn't work, you may need a new cap (usually sold with the rotor anyhow). It shouldn't be too expensive and it's a normal wear item that will have to be replaced at some point, so it doesn't hurt to do it anyhow.

Also, at the parts store, try out some Seafoam engine cleaner, and clean out the vacuum system/manifold with it (instructions are on the bottle, or reply back and I'll give you a procedure for it) - it may be that you have carbon buildup that is causing trouble for you.

Posted on Aug 30, 2008

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