o2 sensor problem?

S

Sanford

New Member

May 3, 2004

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0

Maryland

Jun 9, 2004

#1

• Jun 9, 2004

• #1

Hey i was just wondering if anyone has had troube with O2 sensors going bad... my car was running horrible all rich and smokin so i checked my timing and changed the o2 sensors and it ran great for about 2 days... then it starting runing bad again... just wonding if anyone had any ideas..thanks brian

 

jrichker

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Mar 10, 2000

27,512

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Dublin GA

Jun 9, 2004

#2

• Jun 9, 2004

• #2

Dump the codes and see what the computer says is wrong…

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great.

See http://www.troublecodes.net/Ford/
OR
See http://www.dalidesign.com/hbook/eectest.html for more descriptive help
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

 

4dStang

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Oct 23, 2002

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Near St Louis, Missouri

Jun 9, 2004

#3

• Jun 9, 2004

• #3

Did you pull any plug to look for fouling? If you just replaced the 02 sensors, they can't be messed up like you explain after 2 days. I think you have something else causing a rich fault. Check the vacuum line on the top of the fuel pressure regulator, see if it has fuel. If it does, the FPR may need to be replaced. I would try looking at that first and see if that can fix it. That's my guess.


Chris

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Jun 10, 2004

#4

• Jun 10, 2004

• #4

dont forget the ECT and ACT sensors....they can be out of calibration.....motor thinks it is cold at all times (rich), etc.
it wont necessarily toss a code, as it can be within spec, but incorrect for the situation.

good luck.