[hjordanfishere]

Keep in mind that the computer has no idea if the o2 sensor is reading properly in some cases. For example if an o2 sensor was sticking rich, the computer would assume it was reading correctly and begin taking away fuel to compensate. This is referred to as a "false rich" condition. The computer would be leaning the engine and setting a possible P0172, P0175. The codes would indicate the engine was running rich but it ACTUALLY is running lean. If you use only the false rich codes to diagnose and don't observe all the fuel trim and o2 sensor data, you may make a false diagnosis.

[Polargeo]

If you experience ST or LT fuel trims that are in the double digits positive or negative this would indicate a abnormal adding or lessening of fuel. This could be due to leaking fuel injectors, an unmetered air leak or something similar. For example, if the o2 sensors are reading lean due to, say, a vacuum leak, the engine computer will compensate by adding fuel.

[dob]

Think of it like this: You're driving from the beach at sea level into the mountains. On a short-term basis, you may go up and down several hundred feet at a time as you ascend the mountainous terrain. But, over the long-term, you are actually ascending from low to high altitude several thousand feet, gradually. It's similar with short and long-term fuel trims. STFT are immediate ups and downs in fuel, while LTFT are what is occurring over a longer period. more

[dogparts]

A normal STFT reading will generally fluctuate between negative and positive single digits 2-3 times per second. Usually they'll stay around positive or negative 5%, but they may occasionally go up towards 8 or 9% depending on the efficiency of the engine, age of the components, and other factors. A normal long term fuel trim reading will appear to stay the same, giving a long term average of fuel added. It, too, should be close to zero, positive or negative single digits under normal circumstances. It will fluctuate much slower, possibly appearing static. [links]

[endian7000]

Also, each bank has it's own fuel trim reading. If your engine is a 4 cylinder, then it has only one bank, Bank 1. On a V-style engine you can isolate which bank is running rich or lean by watching that bank's fuel trims. If one bank is running properly, and another isn't you can narrow down a developing problem to one side of the engine or the other.

[jb55]

Normal STFT Reading
more

[trin]

DETROIT – Chevrolet today confirmed the future expansion of the brand’s popular ZR2 trim to the Silverado. The ZR2 trim relaunched on the Colorado mid-size pickup in 2017, and since then, ZR2 has signified high-performance capability in a wide variety of drive settings – both on- and off-road.

[altsa]

Celebrating those who love the mud. Tune in this fall to see what's new from #Silverado. pic.twitter.com/MUYoEUyBZa— Chevy Trucks (@ChevyTrucks) June 30, 2021

[foo barf]

Stay tuned to learn more about the future addition to the Silverado lineup this fall. more

[assdewqq]

Purchase your Trim Limit and Trim Position Sender Switch Kits HERE.

[cryptofo]

Now, position the clamp and gently snug up to tighten. [links]

[bit-numismatist]

It's simple to fix, just redo everything again.

[dorianm421]

2006 GMC Sierra 2500 Duramax more

[Kir]

2008 Crossroads Seville 5th wheel more

[tadcroz81]

I have the same boat on order. What do you mean by off?

[OBTC]

Hello, suprised to see another from ND here on the forum. Where abouts do you call home and or do most of your boating? more