[Toadster]

will I see some MPG improvement?

also, should I disconnect the batter to have the ECU relearn?

 

[Cope Rebel]

Depends if the old ones were bad, and you shouldn't have to reset ecu as it adjusts on the fly with whatever it's reading from them.
If you were throwing a code than yes you need to reset the ecu.


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[Toadster]

Depends if the old ones were bad, and you shouldn't have to reset ecu as it adjusts on the fly with whatever it's reading from them.
If you were throwing a code than yes you need to reset the ecu.


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no codes but MPG has been declining over time, we did the knock sensors last year and that made a huge difference (7mpg -> 12mpg) - still not getting 13.5 like we used to...

the plugs have about 40k on them - but they're NGK Iridiums :favorites37:

 

[Cope Rebel]

Upgrade to a bigger tire? If your front 02s went out, which isn't very common on these trucks, they would throw a code. I would swap those plugs out for some ac delco iridiums, check your air filter/upgrade to a k&n or similar drop in filter. Check intake for vacuum leaks..


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[stoner51]

If you are concerned about getting more MPG's I would replace both the front 02 sensors.
They will run you about $100 and if it works great if not you don't have any doubts that you have tried everything.

I am new to the gmc stuff only had it for a week. But my DD 91 accord has a innovate wideband that I use with hondata s300

This is from innovatives site. They recommend calibrating the o2 sensor every year for optimal performance. Because the sensors are in the exhaust stream and they get subjected to carbon and buildup which alters the readings over time.
http://www.innovatemotorsports.com/resources/whycalibrate.php

Take it for what you want.

steve

 

[Toadster]

Upgrade to a bigger tire? If your front 02s went out, which isn't very common on these trucks, they would throw a code. I would swap those plugs out for some ac delco iridiums, check your air filter/upgrade to a k&n or similar drop in filter. Check intake for vacuum leaks..

I'll have to check the air filter, I cleaned it about a month ago - should be ok.

If you are concerned about getting more MPG's I would replace both the front 02 sensors.
They will run you about $100 and if it works great if not you don't have any doubts that you have tried everything.

I am new to the gmc stuff only had it for a week. But my DD 91 accord has a innovative wideband that I use with hondata s300

This is from innovatives site. They recommend calibrating the o2 sensor every year for optimal performance. Because the sensors are in the exhaust stream and they get subjected to carbon and buildup which alters the readings over time.
http://www.innovatemotorsports.com/resources/whycalibrate.php

Take it for what you want.

steve

yep, did both O2s - the new few tanks will tell

 

[Blue 04 Z71]

I'd like to replace mine but I doubt I'll get the old ones out, tried on my older truck and I broke the bung off the pipe. Only have 118,000 miles too.

 

[Toadster]

I'd like to replace mine but I doubt I'll get the old ones out, tried on my older truck and I broke the bung off the pipe. Only have 118,000 miles too.

PB Blaster is your friend :wave: