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  #1  
Old 11-10-2010, 12:14 PM
GoTigers11 GoTigers11 is offline
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Cool Cylinder Misfire?

Ok...my 99 dodge truck is running a little rough lately. I just recently had a code come up that said "Cylinder 8 misfire". So...I did a tune up (replaced plugs, wires, distributor cap and button, new filter) whole nine yards. I even ran some sea foam through the gas tank and through the intake as per the directions on the can. Running it through the intake is supposed to break up an carbon buildup in the motor....smokes like a champ for a lil while after you do this. Ive done all this and it is still giving me the code. I occasionaly get a spark knock noise if I run a low grade gas...so I usually run 89 octane or higher. Could this be an injector issue in that one cylinder? Any suggestions?
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Old 11-10-2010, 12:18 PM
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Is the plug oil fouling? If so, you may have a plenum pan gasket leaking. If not, you can try swapping injectors around to see if the misfire follows the injector from the #8 cylinder.
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Old 11-10-2010, 02:47 PM
GoTigers11 GoTigers11 is offline
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Is it common for injectors to cause this type of problem? The sparkplug that I pulled out of that cylinder was terrible....the ground wire was completely burnt off of the plug in the #8 cylinder. I had a gentleman tell me that it is probably the injector not pulsing right and causing the truck to run lean. Eventhough the cylinder is not receiving the fuel it needs the sparkplug is still firing. So it would cause the sparkplug to burn hot and foul out quicker.
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Old 11-10-2010, 03:13 PM
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A lean condition can cause a plug to burn up and an injector can cause a lean condition but I wouldn't call it a common problem. What do the rest of the plugs and secondary ignition look like?
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Old 11-11-2010, 01:36 PM
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The rest of the plugs look good...I recently replaced all the plugs. By far cylinder #8 was the worst. All the others didn't seem abmormal in wear.
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Old 11-11-2010, 02:15 PM
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Have you replaced the plug and ran the engine again? If the cylinder is running lean enough to cause the plug to melt, you should be getting bank two lean codes in the PCM and the it should be trying to compensate by increasing fuel to the right bank and it would show up on the plugs.
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Old 01-06-2011, 03:22 PM
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have you replaced your intake manifold on this truck? When the plenum starts leaking...it causes the number 8 cylinder to foul. You can keep changing the plug or cleaning it, but will take the plenum to be replace to really fix it.
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