JDOwen2 Posted April 26, 2004 Share Posted April 26, 2004 In the process of changing spark plugs and cables I noticed that the back side of throttle blade and intake tract from there back was coated with a black, thick gummy substance. :o I cleaned it with throttle body cleaner. Could this have been caused by a bad PCV valve? Anything else? Quote Link to comment Share on other sites More sharing options...
SKperformance Posted April 26, 2004 Share Posted April 26, 2004 normal residue is black carbonm which is just a dry black soot if it is gummy it is probably carbon and oil from an oil breather return line like that of the pcv which can stick open Quote Link to comment Share on other sites More sharing options...
Bubbles Posted April 26, 2004 Share Posted April 26, 2004 It could be the exhaust gas recirculation no? Quote Link to comment Share on other sites More sharing options...
SKperformance Posted April 26, 2004 Share Posted April 26, 2004 EGR runs really hot air so it will leave a dry soot but nothing that is gummy as it would burn it up Quote Link to comment Share on other sites More sharing options...
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