Recently had to replace the head gasket and due to time constarints I had to have a shop do it. They replaced the O2 sensor and everything ran great for a day or two but now it is cruddy again and terrible gas milage. My questions are:

Is there more then one O2 sensor in a 95 4Runner?

Does anyone have any suggestions on why it would be running bad?

 

Whats your definition of running bad?

Fink

 

yes you do have 2 O2 sensors. one before and after the cat. although i think there would be a check engine light on if either one was bad.........


but definetely tell us more about how its running crappy.......try to be more specific

 

actually not all 95's have two 02 sensors...just the ones with california emissions...

 

really?? i had no idea.......figured mine was just the norm with two.

guess you learn something new everyday

 

i GUESS i WILL HAVE TO GET UNDER IT AND CHECK IT OUT MYSELF <caps> I did get a check engine light on my way into work this morning, so I may have more to go on this evening. As for how it is running bad:

It idols rough and gets bad gas milage.

 

If you paid a shop to do the job, and they didn't do it properly, take it back and make them fix it. If you tear into it yourself, they could absolve themselves of any liability.

Chris

 

good point... I will try and get it to them tomarrow.

 

BTW, I only have 1... after the cat.

 

I thought if you only had one it would be before the cat...

 

yup...i only gots one..before the cat

 

did you pull the codes from the comp?

if not you look under the hood you will see a small grey box by your fuses. open up the cover and

1 Turn the ing to on(engine not running)

2 you need a paper clip to bridge the 2 pins TE1 and E1(see diagram inside of grey cover)

3 then look at your check engine light and count the flashes.

quarter sec flashes indicate the number with a 1.5 sec pauses between flashes.

example 2 flashes pause 3 flashes =23

the cycle will repeat it self when all codes have been read

hope this will help you out

 

The check engine light has now turned off. Will I still be able to get a reading of the last problem?

 

Yes you can . THe ecu will keep the codes till you reset it