Wags17MKx Posted September 20 Report Share Posted September 20 I just bought the '17 MKx 3.7 FWD in May. After a few weeks I noticed when I'm accelerating harder to merge into the Freeway, a few seconds later we smell the rotten egg! I never notice the smell any other time. I read a bunch of TSB's about the issue. beside the Cats, a lot about the vortex (behind hatch) sucking the smell into the interior. Any ideas, beside new Cats? Quote Link to comment Share on other sites More sharing options...
1004ron Posted September 20 Report Share Posted September 20 Welcome. The smell of rotten eggs comes from the CAT which only happens when un-burnt fuel get into the CAT which is a sign of an ignition or injector issue. If its been going on for a while you may need new CAT's by now but address the fuel issue first or the new CAT's will be toast in a short time. The fact that its getting in to the cabin is a secondary issue. Have you used a reliable scanner such as Forscan to check for codes? Quote Link to comment Share on other sites More sharing options...
Wags17MKx Posted September 20 Author Report Share Posted September 20 I ran codes with my old Actron and my son's Blue Driver; no codes came up! I've had Forscan for a decade, but still haven't figured out how to use it beyond loading the stock info, of my 02 F150 Screw Quote Link to comment Share on other sites More sharing options...
1004ron Posted September 20 Report Share Posted September 20 (edited) My advice would be to use a reliable scanner like Forscan as a first step in the diagnostics, and monitor the O2 and fuel trim data. Edited September 20 by 1004ron Quote Link to comment Share on other sites More sharing options...
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