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Old 09-12-2010, 07:06 PM
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lean/rich spark plug test reading.

Hi, working on a 64 vw bus and wanted some more guidance on how to accurately tell if my engines burning lean or rich or close enough. First off, once a plug gets its color of burn, do you have to change it if you rejet your carburators or will the plugs color still get whiter if its lean or of course more twards black if its rich.

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Old 09-12-2010, 08:55 PM
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You want the spark plug to look like a piece of toast. black means it to Rich and white mean lean if I were you I would go ahead and replace the plugs but if your on a tight buget you could clean the plugs and once there ran in the car they will change in color hopefully look like toast
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Old 09-13-2010, 12:31 PM
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not really on a tight budget, but just want to understand how to do it......the right way. If you get too much color on them past the toast mark, will they change back if new jets lean it out or once the burn pattern is burnt onto the porcelin, its done? Hmmm clean them. carb spray, toothbrush, gasoline? Before I installed dual carbs on it, I could almost never get the plug color to leave the white or off white zone. Now maybe that was some overheating, not sure. Yep, Ive heard toast or peanutbutter is the goal but due to issues with my engine in the past, Im just checking to see if Im possably doing something wrong. I do have 2 new sets of bosch plugs. Hate to use them if I dont have to but if necessary, will do.
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Old 09-13-2010, 12:48 PM
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I clean my plugs with a glass beads in sandblaster but u can also use a small file to clean the ground electrode and center electrode and use carb cleaner to clean the procilain ( I dont think I spelled that right) and if you get the carb jetted right then the plug should should turn a toast color once driven
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Old 09-13-2010, 03:29 PM
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Stick a heated 02sensor on the exhaust and read it with a volt meter.
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Old 09-14-2010, 01:20 AM
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yeah Im sure one could read an 02s voltage but I wouldnt know what voltage into afr would translate to.
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Old 09-15-2010, 12:39 AM
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Quote:
Originally Posted by fumplet
yeah Im sure one could read an 02s voltage but I wouldnt know what voltage into afr would translate to.
google it. its not that hard
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