Symptoms of bad O2 sensors? What do you think is wrong?

91LX_5L

Founding Member

May 13, 2002

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British Columbia

Sep 2, 2007

#1

• Sep 2, 2007

• #1

I get about 120 miles to the tank.
Car tends to run rich.
Get small burps/backfires if I rev it up then let off gas and hit it quick again.
Tends to hesitate when I accelerate fairly hard (takes like 1/2 second to pickup)
When I first start it up it hunts for a idle and stalls sometimes.
seems that it should have some more power.

I have H/C/I, I dont think they have ever been changed? Have 45,500 miles on it. Can you clean them or do you need new ones?

Have new fuel filter, cleaned maf, air filter is good, plugs wires low mileage on them. Cap and rotor mabye could use a replace?

PS: Whats involved in changing them, just unbolt the old ones and put the new ones in, wiring right there or do i have to remove H pipe or what?

THANKS

 

bill302

Active Member

Nov 2, 2005

2,131

1

46

alabama,gadsden

Sep 2, 2007

#2

• Sep 2, 2007

• #2

pull the codes and repost results.. click on link below

http://www.muscularmustangs.com/test1.php

 

Pokageek

Active Member

Jun 10, 2005

2,767

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MA, USA

Sep 3, 2007

#3

• Sep 3, 2007

• #3

Yep, get under the car, unsnap the quick connectors, unscrew the sensors and reverse the process to replace. Symtoms are what u dscribe. I am having the same issue. Car goes....errrr nnn putt putt putt POP! runs rich, won't idle right, blows out smoke.... I think I killed my 02's with the rich tune and having it re-tuned.

 

91LX_5L

Founding Member

May 13, 2002

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36

British Columbia

Sep 3, 2007

#4

• Sep 3, 2007

• #4

do I have to rewire or is it just a harness?

ill try gettin the codes.

 

C

Cheyeter

New Member

Jul 31, 2007

42

0

0

Little Rock, Ar.

Sep 3, 2007

#5

• Sep 3, 2007

• #5

its just a harness plug and play. You also might want to think about the ignition module depending on how old and/or miles are on it. Def pulll the code! see what the banks are doing...

 

HISSIN50

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

15 Year Member

Nov 29, 1999

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129

Sep 3, 2007

#6

• Sep 3, 2007

• #6

If you go to swap them, be prepared that they will be seized in there. Something along the lines of a 22mm box-end wrench fits them (I dont like O2 sensor sockets).

You can check each one for switching and amplitude. After the engine has run for two mins, look for the signal to read 0.1 - 0.9 volts, and switch atleast once a second (the voltage will toggle back and forth, from lean to rich).

Good luck.

 

Blackened302

Active Member

Jul 21, 2005

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South TX

Sep 3, 2007

#7

• Sep 3, 2007

• #7

exact same symptoms i had when mine went bad. once replaced, car ran a lot better (still had vac leaks, etc).

 

91LX_5L

Founding Member

May 13, 2002

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36

British Columbia

Sep 3, 2007

#8

• Sep 3, 2007

• #8

I think ill change them, i dont plan on selling my car so new parts are new parts, less to change down the road, ill try to get the codes still and get back to you guys.

Ignition Module how long does it usually last im at 45k.

 

HISSIN50

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

15 Year Member

Nov 29, 1999

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129

Sep 3, 2007

#9

• Sep 3, 2007

• #9

Ig module should be ok for awhile (but you never know). The PIP is more prone to failing but you should have another 45K miles in yours (atleast).

Good luck.

 

Pokageek

Active Member

Jun 10, 2005

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Sep 3, 2007

#10

• Sep 3, 2007

• #10

If yuo do buy them, maybe get the ngk's from summit. $38 each was te cheapest - reputable ones I could find anywhere. Good luck.

 

91LX_5L

Founding Member

May 13, 2002

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36

British Columbia

Sep 3, 2007

#11

• Sep 3, 2007

• #11

what about the $25 ones on ebay? garbage, should I get bosh or ngk or no name?

 

legalize420

Active Member

May 21, 2005

1,541

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37

South Florida

Sep 4, 2007

#12

• Sep 4, 2007

• #12

my check engine light came on when mine went out. if yours is not on chances are they are not the problem. is your egr hooked up? those are the problems i had when i tried deleting mine. as others mentioned i would get the codes pulled before you start spending money replacing things.

 

91LX_5L

Founding Member

May 13, 2002

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British Columbia

Sep 4, 2007

#13

• Sep 4, 2007

• #13

yeah good call thanks, gonna go by my buddies work and pull the codes, ill update this evening. but if it happens to be O2s does brand matter, assuming yes but you never know...?

someone mentioned it could be the IAC, I have cleaned it before but what do you guys think about that?

 

The Green GT

No 13 year olds are safe around me.

10 Year Member

Jan 8, 2006

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99

Louisiana

Sep 4, 2007

#14

• Sep 4, 2007

• #14

When mine were bad Id get like 11 MPG on the HWY, and the CEL would come on every once in a while under heavy load.

 

91LX_5L

Founding Member

May 13, 2002

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British Columbia

Sep 4, 2007

#15

• Sep 4, 2007

• #15

My engine light has never came on?

UPDATE WITH CODES

Codes it threw:

314 - Thermactor Air System Not Working - Bank 2
311 - Thermactor Air System Not Working - Bank 1

Which appears my air pump isnt working properly. What im going to do is order a smog pump eliminator kit (allows me to run stock belt right?), remove all that emissions stuff and plug the back of my heads (remove bolt and weld it).

I think I might try the IAC then?

 

bill302

Active Member

Nov 2, 2005

2,131

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46

alabama,gadsden

Sep 4, 2007

#16

• Sep 4, 2007

• #16

91LX_5L said:

What im going to do is order a smog pump eliminator kit (allows me to run stock belt right?), remove all that emissions stuff and plug the back of my heads

Click to expand...

yes exactally what i did.yes you will run the stock belt with the delete pulley...i would remove the smog equip. as long as you are not require to pass emmissions testing...click on link below it will tell you step by step instructions how to remove smog equipment and tools needed...its the article i used to remove mine...

http://www.allfordmustangs.com//techarticles/Smog2.pdf

 

91LX_5L

Founding Member

May 13, 2002

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36

British Columbia

Sep 4, 2007

#17

• Sep 4, 2007

• #17

sweet to plug the back of my heads im just gonna take that bolt out of the back and weld it up, easiest way to get at it IMO?

 

The Green GT

No 13 year olds are safe around me.

10 Year Member

Jan 8, 2006

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99

Louisiana

Sep 4, 2007

#18

• Sep 4, 2007

• #18

I think a spark plug will fit there too.

 

91LX_5L

Founding Member

May 13, 2002

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British Columbia

Sep 5, 2007

#19

• Sep 5, 2007

• #19

you guys didnt get any idling issues or worse mileage when you took out your smog stuff did you? any reasons i shouldnt take it out?

 

Pokageek

Active Member

Jun 10, 2005

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MA, USA

Sep 5, 2007

#20

• Sep 5, 2007

• #20

Smog makes 0 difference in the idle or anything else.