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May 28, 2013 | 09:50 PM

Super Econoline

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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 ?

May 28, 2013 | 11:02 PM

tabijan

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From: Eastern TN

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

May 28, 2013 | 11:57 PM

Super Econoline

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Quote:

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?

May 29, 2013 | 07:13 AM

Cobra-Kai

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From: Peine, Germany

Because the Oxygen Sensor is still working - but just not right.

If you disconnect the Sensor, the "Check-Engine"-Light goes on.

May 29, 2013 | 01:23 PM

tabijan

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Joined: Sep 2012

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From: Eastern TN

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

May 30, 2013 | 08:05 PM

Super Econoline

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Quote:

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?

May 31, 2013 | 07:42 AM

Cobra-Kai

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Joined: Jul 2012

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From: Peine, Germany

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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May 31, 2013 | 01:48 PM

tabijan

Cargo Master

Joined: Sep 2012

Posts: 2,112

Likes: 286

From: Eastern TN

Stupid question but does the check engine light come on before you hit the starter?

Sixto
E150 Chateau 5.8 185K miles

May 31, 2013 | 06:04 PM

#10

cappo

Junior User

Joined: Feb 2013

Posts: 70

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From: Chicago

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