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I am still trying to figure out the vexing spark plug issue that's been plaguing my C900. About every few thousand miles or so, I will have one of my NGK iridium plugs go bad. It's typically the one installed in the #4 cylinder (closest to the front of the car) but I did once have it "kill" the #1 cylinder sparkplug. When the sparkplugs start fading, they start off not firing the cylinder when the engine is cold, and then it takes warmer and warmer for the engine to warm up before the cylinder "kicks in". Eventually, it gets to the point where the plug will not fire the cylinder at all.
If I take the plug out and install it in another cylinder, that cylinder will then not fire, but the original cylinder will start firing OK (until it ruins that plug). No amount of cleaning the sparkplug with sandpaper or carb cleaner, or re-gapping (yes, iridium plugs can be re-gapped as long as you don't put pressure on the center electrode) will bring it back to life. I have checked the plug with a multi-meter, and it reads 3.5K ohms, telling me the resistor is still good inside, and I've got continuity.
Now, here comes the interesting thing, when I hold the spark plug wire just a slight bit above the "dead" plug, so that the voltage has to jump the gap between the wire boot and the plug, I can get the cylinder to fire if I hold it just right. This, I guess lets the high voltage build up high enough to fire the plug and get the cylinder to fire. Placing the boot all the way down on the cylinder gets it mis-firing agan. My thought is that my ignition coil may be weak, and not giving me enough high voltage to "clean" the plug off and make the cylinder fire. I have had the car die twice on me after driving in heavy rain, so I am thinking the two issues may be related.
Second thing...I've got some Bosch 7mm spark plug wires, that I ordered that are just basically OEM replacement ones. While troubleshooting, I attempted to install one of the spare plug wires off of my Chevy van. Those are nice ACCEL 8.8 mm spiral core wires. The problem was that the distributor socket is different, and it of course, didn't fit, so I couldn't use it. Now, I want to replace the coil with a high-performance aftermarket coil like an MSD or ACCEL coil, and likewise, replace the plug wires too. The issue I have though is that these look like some sort of oddball clips on these components that don't (well, at least to me being an American car junkie)look like any sort of industry standard.
So, does anyone know if any high-performance plug wires are available for these cars (like my nice ACCELL 8.8's I have on my van's Chevy 350) that will fit the distributor cap? and will adapt to an aftermarket coil? I'm going after these components as being the reason why the car is "killing" the sparkplugs.
posted by 72.82.48...
, Sun, 17 Aug 2008 19:24:16, Sun, 17 Aug 2008 21:54:56
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