Plugs fouled Running Rich

Asked by Rlnorth Nov 21, 2019 at 03:13 PM about the 2007 Saab 9-3 2.0T

Question type: Maintenance & Repair

Two new sets of plugs become fouled in 300 miles. New air filter. Car seems to
be running rich. How do I diagnose this and how do I repair it. Some forums
suggest the o2 sensor. ideas?

2 Answers
235

Paininthe93se answered 4 years ago

ah...the old fuel trim mystery ! Check out this guy Schrodingers Box on yewtoob: https://www.youtube.com/watch?v=5WnM_NsOtd8 Best on-line instructor I've come across, he unravels the mysteries of diagnostics really. well. You need to understand the problem before you can fix it !

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