# Running Rich **URL:** \ **Category:** SON240sx Automotive\ **Created:** [July 16, 2009, 7:16pm UTC](https://forums.speedlife.net/t/running-rich/126310 "2009-07-16T19:16:07Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![91S131](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91s131/32/5732_2.png) [@91S131](https://forums.speedlife.net/u/91S131)\ **Post date:** [July 16, 2009, 7:16pm UTC](https://forums.speedlife.net/t/running-rich/126310/1 "2009-07-16T19:16:07Z")
car was getting bad gas mileage so i have replaced everything for tune up except cat and my car stank like eggs when i would step on it, so i cut out the cat and put a pipe and now i can really smell the fuel and have been getting worse mileage.? whats getting me this mileage and why the smell of fuel ? ps everything is stock ---
**Author:** ![RUSSKII](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/russkii/32/5696_2.png) [@RUSSKII](https://forums.speedlife.net/u/RUSSKII)\ **Post date:** [July 16, 2009, 8:40pm UTC](https://forums.speedlife.net/t/running-rich/126310/2 "2009-07-16T20:40:00Z")
i have the same thing with my sr, mine doesnt smell like eggs, but I do smell fuel when i go past 3k and the gas mileage is pretty bad, like 300 a tank. Would also like to know what is causing this. ---
**Author:** ![Dj-Infinit](https://avatars.discourse-cdn.com/v4/letter/d/7cd45c/32.png) [@Dj-Infinit](https://forums.speedlife.net/u/Dj-Infinit)\ **Post date:** [July 16, 2009, 8:46pm UTC](https://forums.speedlife.net/t/running-rich/126310/3 "2009-07-16T20:46:07Z")
check coolant temp sensor and check ecu codes for starters. ---
**Author:** ![Wongger](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@Wongger](https://forums.speedlife.net/u/Wongger)\ **Post date:** [July 16, 2009, 10:15pm UTC](https://forums.speedlife.net/t/running-rich/126310/4 "2009-07-16T22:15:47Z")
Same problem, I fixed it cause I have a bad distributor and rotor. Other things I tried where, fuel system cleaner, checked for gas leaks, and changed plugs and wires. maybe injector problem? not sure ---
**Author:** ![AhmadG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ahmadg/32/5577_2.png) [@AhmadG](https://forums.speedlife.net/u/AhmadG)\ **Post date:** [July 17, 2009, 11:23am UTC](https://forums.speedlife.net/t/running-rich/126310/5 "2009-07-17T11:23:17Z")
I have the same thing, but I have a code 34, so knock sensor. This means its running an overly rich map and a very conservative timing map to prevent potential knock. This explains my 18mpg weaksauce KA. lol A bad coolant temp sensor can also make you run super rich. Check that with a multimeter, along with all of the injector coils for being in spec. When the car is driven for the first 10 minutes, it feels so peppy, after a while, like I’m towing a Volvo. lol ---
**Author:** ![Hurricane](https://avatars.discourse-cdn.com/v4/letter/h/e9bcb4/32.png) [@Hurricane](https://forums.speedlife.net/u/Hurricane)\ **Post date:** [July 17, 2009, 12:19pm UTC](https://forums.speedlife.net/t/running-rich/126310/6 "2009-07-17T12:19:10Z")
The egg smell is a bad cat usually. ---
**Author:** ![AhmadG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ahmadg/32/5577_2.png) [@AhmadG](https://forums.speedlife.net/u/AhmadG)\ **Post date:** [July 17, 2009, 12:36pm UTC](https://forums.speedlife.net/t/running-rich/126310/7 "2009-07-17T12:36:33Z")
When my cat was new and I was running rich I got the rotten egg smell (sulphur), but it went away over time. Now I just smell fuel. lol ---
**Author:** ![91S131](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91s131/32/5732_2.png) [@91S131](https://forums.speedlife.net/u/91S131)\ **Post date:** [July 17, 2009, 1:30pm UTC](https://forums.speedlife.net/t/running-rich/126310/8 "2009-07-17T13:30:02Z")
i will check both sensors (ahmadG) thanks. anything else i should look for ? getting poor mileage and smells like pure fuel in car and out. have changed everything for tune up except wires. ---
**Author:** ![AhmadG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ahmadg/32/5577_2.png) [@AhmadG](https://forums.speedlife.net/u/AhmadG)\ **Post date:** [July 19, 2009, 8:50am UTC](https://forums.speedlife.net/t/running-rich/126310/9 "2009-07-19T08:50:07Z")
One more thing just for safety, go to the back of the car and lift up the carpet from the trunk/hatch area. If the fuel smell is stronger around that cap over the gas tank and fuel pump assembly, bad news. lol