Question about 1997 Dodge Ram 1500 Club Cab

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Engine misses when driving at highway speed. #8 missfire showing on codes. checked fuel injector and plugs. good compression.... now what?

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Get the heads check might need replacing. I had mine done

Posted on Aug 02, 2008

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Hi,

how about plug wires? have they ever been replaced?
just an idea

J

Posted on Aug 01, 2008

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You did not say whether or not you changed the plug wires when you changed the plugs. I assume so, but if not you may want to try swapping the #7 wire with another wire of similar length at both ends and see if the miss goes away or moves to the new cylinder. Visuals can be misleading with plug wires as they can be easily damaged and break down with age. If they are original to the vehicle, I would not hesitate to change them at this time. The "lack" of miss at highway speed, on an 8-cylinder vehicle, is often the fact that it may not be felt when little or no engine load is present. Other than that, the miss could be caused by a leaky valve (most likely exhaust). This would result in low compression of the cylinder, resulting in misfire. A compression check will find this easily. Leaky fuel injector can also cause misfires. If the cylinder gets too much fuel, the spark may fail occasionally, causing a misfire condition. There are other things that can cause misfires, but not in just a single cylinder such as you describe.

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Check the HT lead and dizzy cap / coil plug .
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Check the lead for little greyish marks (this is a sign of arcing) do the same for the connection the lead plugs into.
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