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fuel rich

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Old 05-28-2013, 09:50 PM
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fuel rich
89 E250 351W EFI

has too rich gas smell from exhuast so i check fuel pressure it showed 40 PSI it good but i have no idea why gas too rich ?
 
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Old 05-28-2013, 11:02 PM
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The O2 sensor might be faulty. Here's some reading on testing the O2 sensor - http://www.autodiagnosticsandpublish...or-testing.htm .

Sixto
93 E150 Chateau 5.8 185K miles
 
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Old 05-28-2013, 11:57 PM
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Originally Posted by tabijan
The O2 sensor might be faulty. Here's some reading on testing the O2 sensor - o2-sensor-testing .

Sixto
93 E150 Chateau 5.8 185K miles
Thanks for info... but why dont computer warning light on "check engine" if oxygen sender is failed?
 
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Old 05-29-2013, 07:13 AM
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Because the Oxygen Sensor is still working - but just not right.

If you disconnect the Sensor, the "Check-Engine"-Light goes on.
 
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Old 05-29-2013, 01:23 PM
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Off topic - later vehicles (OBD-II?) have a downstream O2 sensor to validate the signal of the primary O2 sensor upstream of the cat.

Sixto
93 E150 Chateau 5.8 185K miles
 
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Old 05-30-2013, 08:05 PM
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Originally Posted by Cobra-Kai
Because the Oxygen Sensor is still working - but just not right.

If you disconnect the Sensor, the "Check-Engine"-Light goes on.
let you know i did disconnect oxygen sensor and "check-engine" not come on..

what next?
 
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Old 05-31-2013, 07:42 AM
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That's odd.
I disconnected mine and the light went on...

Does it always smell like gasoline or only when the engine is cold?
 
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Old 05-31-2013, 08:24 AM
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A dirty air filter will do this, too.
 
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Old 05-31-2013, 01:48 PM
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Stupid question but does the check engine light come on before you hit the starter?

Sixto
E150 Chateau 5.8 185K miles
 
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Old 05-31-2013, 06:04 PM
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does the engine run rough?. my '99 had 1 bad plug and for some reason did not trigger the check engine light. that was the gas smell and soon after the check engine light did come on
 
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Old 06-01-2013, 08:14 PM
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Originally Posted by tabijan
Stupid question but does the check engine light come on before you hit the starter?

Sixto
E150 Chateau 5.8 185K miles

yes it does check engine light come on when i hit starter after started light go away.
 
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Old 06-01-2013, 08:15 PM
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i just finished install new oxygen sensor and Map sensor now rich fuel go away!! feel little more power now
 
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