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backfire? 850 1997

posted by  someone claiming to be Frank on  Tue Aug 4 15:29 CST 2009 [RELATED]

Recently I've been hearing a very infrequent "pop" which seems to be coming from the exhaust system. It seems to happen more often when I am cruising at highway speeds with little load on the engine. I did a scan and noticed that it triggered the famous 0172 code.

Could it be that unburnt fuel is finding its way into the hot exhaust and when conditions are just right, I get a detonation?

Any thoughts or suggestions? Thanks.

97 850 GLT soft turbo w/237K






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