o2 sensors

o2 sensors

PostBy: Wiz On: Sat Sep 28, 2013 10:32 pm

Decide to tune up my 07 silverado before cold weather comes, belts, wires, plugs etc.. It has 98, 000 miles and mpg has been dropping off from 19 to 16. Since tune up no improvement on mpg, so today add snake oil (injector cleaner) to see if it helps. Could o2 sensors be going bad without check engine light coming on? Randy
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: o2 sensors

PostBy: titleist1 On: Sat Sep 28, 2013 11:00 pm

not sure about the O2 sensor, but did you change out the air filter too? the mpg's similarly drops off on my '03 silverado when that needs changing. mine's up to 205k miles now and running good, although I am due for a belt change before winter.

biggest issues i had with mine so far has been brake lines rusting out to nothing about 1-1/2 years ago, a hidden ground strap problem that gave me electrical gremlins and the fuel pump failing. finally got all the gauges to work for the first time in about 7 years after swapping out the stepper motors.

just got a diesel passat tdi about a month ago to ease the fuel usage between my truck (18mpg) and the spousal units acadia (17 mpg) when we don't need the hauling capacity of those vehicles. That thing is awesome, getting about 43mpg on combined city/hwy and over 50mpg on hwy trips. higher than the epa ratings...when does that ever happen?
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: o2 sensors

PostBy: Wiz On: Sun Sep 29, 2013 7:55 am

I'll clean kn filter and maf sensor today, actually didn't look bad when i checked filter. Also put new fuel pump in tank about 4 months ago. I do mostly highway driving and foot is easy on pedel. Being 6.4 with a bad back its hard getting in a fuel efficiency car.
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(


Re: o2 sensors

PostBy: Coalfire On: Sun Sep 29, 2013 7:59 am

Yes your o2's do slow as they age. they have to be almost dead though till the light will come on though. 100K is long enough on a GM o2 however I think your engine is probably running a few degrees to cool. Replace your Thermostat with the appropriate temp, AC delco stat, do not use after market. and slip a pair of o2s in and you should be good to go




Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: o2 sensors

PostBy: Rob R. On: Sun Sep 29, 2013 8:32 am

Wiz wrote:I'll clean kn filter and maf sensor today, actually didn't look bad when i checked filter. Also put new fuel pump in tank about 4 months ago. I do mostly highway driving and foot is easy on pedel. Being 6.4 with a bad back its hard getting in a fuel efficiency car.


Excellent idea. Those KN filters are notorious for fouling the MAF sensor with oil.

Planning on keeping the truck a long time? Change the gear oil in the differential(s) if you haven't already.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: o2 sensors

PostBy: freetown fred On: Sun Sep 29, 2013 9:23 am

OK, here comes the old guy with another question--what the hell is a KN filter?
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: o2 sensors

PostBy: Wiz On: Sun Sep 29, 2013 9:25 am

thanks guys for advice, going to get o2 sensors and maf cleaner so I can get them install today.. anti freeze and thermostat is next's weekend project. Mpg have been horrible for a year now, time to resolve issue.
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: o2 sensors

PostBy: Wiz On: Sun Sep 29, 2013 9:26 am

freetown fred wrote:OK, here comes the old guy with another question--what the hell is a KN filter?

It's a filter that can be cleaned with cleaner and then re -oiled. replacement for a paper filter
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: o2 sensors

PostBy: freetown fred On: Sun Sep 29, 2013 9:30 am

Thanx wiz
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: o2 sensors

PostBy: Freddy On: Sun Sep 29, 2013 12:07 pm

freetown fred wrote:what the hell is a KN filter?


If you do a search, look for K&N. It's a brand name of aftermarket filter that breaths better than stock. They have done well over the years. They started out making small performance filters for snowmobiles & motorcycles & now have branched out into autos. Most all of them are cleanable. Every now & then, clean 'em, re-oil 'em & you're good to go.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: o2 sensors

PostBy: Wiz On: Sun Sep 29, 2013 1:17 pm

after going to local parts dealer, I almost had a stroke. Truck takes 2 upstream o2 sensors for $168.00 each and 2 down stream for $98.00 each. :shock: So now I'll be ordering online oem cheaper. As I pick my jaw off the counter, I got gear oil,maf and throttle body cleaner, thermostat and anti freeze. Project done besides o2, throttle body was carbon up bad and took complete can of cleaner. This time I put very light oil on kn.
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: o2 sensors

PostBy: Coalfire On: Sun Sep 29, 2013 1:26 pm

Wiz wrote:after going to local parts dealer, I almost had a stroke. Truck takes 2 upstream o2 sensors for $168.00 each and 2 down stream for $98.00 each. :shock:



Do not replace the downstream o2 sensors. The upstreams are responsible for fuel control. Downstreams are for cat monitoring, and don't affect fuel milage on your model truck.



Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: o2 sensors

PostBy: Wiz On: Sun Sep 29, 2013 1:33 pm

Coalfire wrote:
Wiz wrote:after going to local parts dealer, I almost had a stroke. Truck takes 2 upstream o2 sensors for $168.00 each and 2 down stream for $98.00 each. :shock:



Do not replace the downstream o2 sensors. The upstreams are responsible for fuel control. Downstreams are for cat monitoring, and don't affect fuel milage on your model truck.



Eric
hey coalfire so having new upstream will not cause issue on down stream ones?
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: o2 sensors

PostBy: Coalfire On: Sun Sep 29, 2013 1:41 pm

Wiz wrote:
Coalfire wrote:
Wiz wrote:after going to local parts dealer, I almost had a stroke. Truck takes 2 upstream o2 sensors for $168.00 each and 2 down stream for $98.00 each. :shock:



Do not replace the downstream o2 sensors. The upstreams are responsible for fuel control. Downstreams are for cat monitoring, and don't affect fuel milage on your model truck.



Eric
hey coalfire so having new upstream will not cause issue on down stream ones?


NO, actually if your cat is getting alittle weak and you put new fast rear o2s in there is a chance, you will set a cat code. I would only ever replace the rear o2s if there was a code for them, other than the newest of vehicles the rear o2s have no effect on fuel milage.

Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: o2 sensors

PostBy: Rob R. On: Sun Sep 29, 2013 1:56 pm

Good advice.

Price the O2's from rockauto.com
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy