# Poor gas mileage,gas odor, no leaks visible

**URL:** <https://community.cartalk.com/t/poor-gas-mileage-gas-odor-no-leaks-visible/40991>\
**Category:** Maintenance/Repairs\
**Tags:** plymouth\
**Created:** [December 19, 2009, 8:51pm UTC](https://community.cartalk.com/t/poor-gas-mileage-gas-odor-no-leaks-visible/40991 "2009-12-19T20:51:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![antony](https://avatars.discourse-cdn.com/v4/letter/a/cab0a1/32.png) [@antony](https://community.cartalk.com/u/antony)\
**Post date:** [December 19, 2009, 8:51pm UTC](https://community.cartalk.com/t/poor-gas-mileage-gas-odor-no-leaks-visible/40991/1 "2009-12-19T20:51:25Z")

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car has 40,000 miles, runs great[1987 model] electric feedback carburetor;16 miles/gallon.3 shops no help.seems to be running rich. [black exhaust pipe] my guesses:carb.o2 sensor,spark computer,computer.thanks for any help

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [December 19, 2009, 11:36pm UTC](https://community.cartalk.com/t/poor-gas-mileage-gas-odor-no-leaks-visible/40991/2 "2009-12-19T23:36:48Z")

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Those are good guesses.  
All except maybe the carb can be tested before replacing parts.