redsilverado05

He said it was regulating up and down on voltage but it was very low as though it was burnt up or not working.

Thats what I thought about the rear O2 as well. If I can get my check engine light to go off by putting it back in or having it tuned out I'll do that instead.

Also he said that when he was looking to the computer it reading that my truck had 4 sensors but it only 3 ( 2 front and 1 rear) because we looked that thing from front to back several times. And also that it was throwing an EGR code but mine didn't come with an EGR valve.

viciousknid

iTrader: (8)

I'll look at one of my logs when I get home and tell you the voltage mine regulate at. I THINK the front O2's are 0-5 volts but can get a little higher

Edit... so I don't know how it can get any lower than that.

budhayes3

iTrader: (19)

The front O2 sensors should fluctuate back and forth between 0 and 1 volt very rapidly if they are functioning properly and there are no other problems. The rear O2's basically just monitor the cat converters and only account for 1-2% of engine a/f ratio control. Don't worry about the cooler stat, it should not give you problems as long as the PCM has been tuned accordingly. The O2 sensor probably just failed because it failed...it happens and it's fairly common. The heaters burn up all of the time, just like light bulbs burn out all of the time

redsilverado05

Ok appreciate it. I'll call him tomorrow again and right down everything he said it was saying so maybe I can post it up and see what everyone thinks.

Either way I'm gonna replace them and put the stock stat back in. What he said makes sense to me and it kind of makes sense of the situation because ever since I put the SLP stat in my truck, slowly but surely it started run funny after a while.

Truckshop

iTrader: (17)

o2 sensors are 0-1 volt. sensors may be bad. your mechanic is full of crap about your exhaust gas temps being too low due to a lower temp t-stat. the headers will affect the egt's more than a t-stat.

redsilverado05

Well my truck was also tuned with cam, cai, and the exhaust un bolted at the y-pipe. So the low temp stat, headers, full exhaust etc weren't on there when tuned. You think adding that on after the tune would cause things to go screwy after a while. I know for a fact it needs a retune but just wandering if it REALLY needs one?

viciousknid

iTrader: (8)

Yes my bad 0-1 mine go from 0 to .8 when working right. I was thinking of the 0-5v requirement on a wideband.
If you have A t-stat in your truck your fine. A 160 is going to operate at the same temp as the 180 or 190 after its warmed up.
I would retune for the Headers, It makes a world of difference.

redsilverado05

Ok. Well he said the my EGT's were too low. I think he said it was running bewteen like 450 and sometimes around 500 degree at the highest. And if thats too low then what would cause that and what would need to be done to fix it?

budhayes3

iTrader: (19)

You could try getting the headers coated to hold in some heat, sometimes LT's allow for lower EGT's.

viciousknid

iTrader: (8)

I don't think your EGT's are effecting it's idling tho. Get tuned for the headers first. It's way colder here than it is in florida and mine idles fine.