Thread: 1991 560SEL spitting out black smoke
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Old 02-22-2012, 02:24 AM
porkface porkface is offline
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Join Date: Nov 2002
Posts: 881
no brand per se, here's a picture of an example-

Amazon.com: Thexton 404 Adjustable Ignition Spark Tester: Automotive

good luck, chuck.
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