Why am I running rich?

**clg82** · 07-21-2008, 06:11 PM

Originally Posted by Mr. Luos

It appears the O2 is creating the rich condition.

What O2's did you replace? Which ones did you put in?
The passenger side O2 appears to be having a problem.

I actually haven't replaced any of them i don't remember which one the mechanic replaced, but how do you know which one is bad and what does the other code mean (exhaust gas recirculating flow insufficient detected)?

**Frost** · 07-21-2008, 06:25 PM

They need to be replaced as a set. That O2 will only get worse, as will your gas mileage and a perceptible feel in the way the car runs at part throttle. Keep them swapped out every 40K miles, 20K with headers to retain good mileage.

**Mr. Luos** · 07-21-2008, 06:26 PM

Originally Posted by clg82

exhaust gas recirculating

EGR system.

**clg82** · 07-21-2008, 06:42 PM

Originally Posted by Frost

They need to be replaced as a set. That O2 will only get worse, as will your gas mileage and a perceptible feel in the way the car runs at part throttle. Keep them swapped out every 40K miles, 20K with headers to retain good mileage.

Ok so will that affect my tune any if I send you my pcm? I want to replace it but do I replace all 4 or what?

Originally Posted by Mr. Luos

EGR system.

So the other one is because I removed my egr for the ls6 intake, can that be deleted Frost?

**Frost** · 07-22-2008, 06:43 AM

Originally Posted by clg82

Ok so will that affect my tune any if I send you my pcm? I want to replace it but do I replace all 4 or what?

So the other one is because I removed my egr for the ls6 intake, can that be deleted Frost?

Fix the O2s before you buy a mail order tune. They are the feedback instrument used for most all of your car's fueling. Only the front 2 matter (bank X sensor 1, if the code is for bank X sensor 2, it's a rear), the rear 2 check on the cats only.

Yes EGR failure is from you having the EGR removed and can be tuned out.

**clg82** · 07-22-2008, 09:10 AM

Originally Posted by Frost

Fix the O2s before you buy a mail order tune. They are the feedback instrument used for most all of your car's fueling. Only the front 2 matter (bank X sensor 1, if the code is for bank X sensor 2, it's a rear), the rear 2 check on the cats only.

Yes EGR failure is from you having the EGR removed and can be tuned out.

I sure will fix the o2 problem, as far as removing and replacing the bad one are they easy to get to and easy to replace. any pointers when replacing an o2 sensor...or pix of where they are actually located...and which one is bad on mine? (P0155- o2 heater circuit, bank2 sensor 1)

**Mr. Luos** · 07-22-2008, 09:15 AM

Passenger side is Bank 2.
Front sensor. Not the after cat.

**clg82** · 07-22-2008, 09:29 AM

Originally Posted by Mr. Luos

Passenger side is Bank 2.
Front sensor. Not the after cat.

thanks mr. luos for all of the help, are they hard to remove since there in the cat, and possibly seized up. and do you know of any pix that i could use to reference where exactly there located?

**Mr. Luos** · 07-22-2008, 09:35 AM

They are basicly right in front of the cat.
Not easy to get too. PB blaster may come in handy.
And I can't recall the size of the wrench needed.

I don't have any pics though. And I am having trouble remembering exactly the location with the stock manifolds in place.

**clg82** · 07-22-2008, 09:49 AM

Originally Posted by Mr. Luos

They are basicly right in front of the cat.
Not easy to get too. PB blaster may come in handy.
And I can't recall the size of the wrench needed.

I don't have any pics though. And I am having trouble remembering exactly the location with the stock manifolds in place.

easy to get to with a jack and jackstands?

**Mr. Luos** · 07-22-2008, 09:59 AM

Originally Posted by clg82

easy to get to with a jack and jackstands?

It is tucked up in there pretty good.

I really don't remember. Hoping someone else will chime in.

**clg82** · 07-22-2008, 11:08 AM

Originally Posted by Mr. Luos

It is tucked up in there pretty good.

I really don't remember. Hoping someone else will chime in.

me too.......

**Frost** · 07-22-2008, 11:13 AM

I haven't worked on a car that had manifolds on it in forever, but they are in the actual manifold.

They *NEED* to be replaced as a set, not just one of them.

**clg82** · 07-22-2008, 01:12 PM

Originally Posted by Frost

I haven't worked on a car that had manifolds on it in forever, but they are in the actual manifold.

They *NEED* to be replaced as a set, not just one of them.

Wouldn't have manifolds if it wasn't for stupid California emissions

i will replace them as a set, what is the signifigance of that? Just curious. and a set you mean the front and rear one on the passenger side........on a side note those things aren't cheap at autozon $80.00 a piece!!!

**Frost** · 07-22-2008, 01:26 PM

Originally Posted by clg82

Wouldn't have manifolds if it wasn't for stupid California emissions

i will replace them as a set, what is the signifigance of that? Just curious. and a set you mean the front and rear one on the passenger side........on a side note those things aren't cheap at autozon $80.00 a piece!!!

no, like I said, only the front ones "matter", they are used for fueling. The rear O2s are for cat monitoring, screw them.

Need to change them as a set because O2s rarely fail, they just begin to wander out of tolerance and get lazy over time. They take your MPG with them when they wander off...

**clg82** · 07-22-2008, 01:37 PM

Originally Posted by Frost

no, like I said, only the front ones "matter", they are used for fueling. The rear O2s are for cat monitoring, screw them.

Need to change them as a set because O2s rarely fail, they just begin to wander out of tolerance and get lazy over time. They take your MPG with them when they wander off...

will do! Thanks for the input I will replace the 2 FRONT ONES. Anyone else with any suggestions or input?