Scratchin my bald-ass head here.


Right. But the problem arises when that air straight from the enigne bay, passes through the PCV and enters the intake manifold behind the Throttle body. That air straight from the engine bay didn't pass through the MAF. Any air that enters the combustion chamber has to pass through the MAF, or it is what is called unmetered air. The computer knows it's there via the o2 sensors, but doesn't know where it came from. So it is technically a vacuum leak. if it doesn't make it run bad, it'll give you lean codes. The computer has the freedom to richen the mixture a little. Once it does that, if the o2 sensors still detect too much oxygen in the exhaust, you get the CEL.
When is the last time you plugged a scan tool into your truck?
 
Last weekend. I posted earlier that I have as shit-ton of codes. O2 sensors, O2 heaters, EGR deleted, EVAP deleted, bank 1 and 2 lean codes. Monitors are a mess. Even though the MAF apparently is not working, I don't have a code for that. Yet, it runs freakin awesome. I don't know how. but it sure does. Checked gas mileage Tuesday, 261 miles, 12.7 gallons. 20.55 mpg. For a 3.0 that is outstanding. And I am not driving it like a grandpa. I thrash it like a rented mule.

Guess I'm at the "If it ain't broke, don't fix it stage".
 
Guess I'm at the "If it ain't broke, don't fix it stage".
I Think you're acting more like this.
Scratchin my bald-ass head here.
 
Last weekend. I posted earlier that I have as shit-ton of codes. O2 sensors, O2 heaters, EGR deleted, EVAP deleted, bank 1 and 2 lean codes. Monitors are a mess. Even though the MAF apparently is not working, I don't have a code for that. Yet, it runs freakin awesome. I don't know how. but it sure does. Checked gas mileage Tuesday, 261 miles, 12.7 gallons. 20.55 mpg. For a 3.0 that is outstanding. And I am not driving it like a grandpa. I thrash it like a rented mule.

Guess I'm at the "If it ain't broke, don't fix it stage".
If you're getting codes, they are not deleted. You just removed parts.

Deleting is done at a pcm level.

Without removal of a PCM's ability to detect a fault, it will set a trouble code and enable open loop fuel and spark tables.

In your year truck, open loop is limp mode, and is severely de-tuned from normal running condition. Your fuel economy has been "good" likely because the truck is programmed to "run well enough to get it to a garage." So, while you are enjoying satisfactory fuel economy, it is important to remember, it absolutely is not running right.

It's why your MAF is not operating, or is only being used as a reference. Your truck (depending on year) is likely running on an alpha-n or speed density fueling strategy. Both are inferior to MAF with the ability to set trims.
 
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If you're getting codes, they are not deleted. You just removed parts.

Deleting is done at a pcm level.

Without removal of a PCM's ability to detect a fault, it will set a trouble code and enable open loop fuel and spark tables.

In your year truck, open loop is limp mode, and is severely de-tuned from normal running condition. Your fuel economy has been "good" likely because the truck is programmed to "run well enough to get it to a garage." So, while you are enjoying satisfactory fuel economy, it is important to remember, it absolutely is not running right.

It's why your MAF is not operating, or is only being used as a reference. Your truck (depending on year) is likely running on an alpha-n or speed density fueling strategy. Both are inferior to MAF with the ability to set trims.
I use it to get back and forth to work, when Ma Nature is throwing a hissy fit, which happens often in Oklahoma. That's all folks. As long as it does this, I do not care. Hell, there was a period of time where the thing wouldn't run without a gallon of 110 Sunoco being added to 93. Pinged really bad on 91 octane. Don't know why. This was back 16 years ago. Suddenly, that stopped with me doing nothing to fix it, and it runs great now on 88 no corn. Two weeks ago, I changed the fuel filter for the first time in probably 10 years. Boy, that woke it up big time.

I've owned this truck since new in 98. I know how well it ran then. I know right now, it is running as well, if not better than it did then. No muffler in the exhaust. Big giant stainless steel mesh cone filter on a full three inch polished intake tube. JET tuning chip on the ECU. Also have a container under the hood I keep full of E85. There are two hose barbs in said container, one at the bottom, one at the top. The bottom one is hooked to the intake tube by the MAF (metered air). The top one is hooked to the old EVAP vacuum port. When the truck runs, the fluid in the bottle bubbles furiously. The vacuum port inhales the vapors of the bubbling fluid. I had to tune down the idle screw on the bigger than stock TB due to this. It raised the idle speed over 200 rpm. Starts on the first turn of the key every single time.

Recently changed the plugs, wires and coils. Plugs looked excellent after ten years in the thing. Looked like they could do another ten years standing on their heads.

As Alfred E. Neuman says, "What, me worry!"
 
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I use it to get back and forth to work, when Ma Nature is throwing a hissy fit, which happens often in Oklahoma. That's all folks. As long as it does this, I do not care. Hell, there was a period of time where the thing wouldn't run without a gallon of 110 Sunoco being added to 93. Pinged really bad on 91 octane. Don't know why. This was back 16 years ago. Suddenly, that stopped with me doing nothing to fix it, and it runs great now on 88 no corn. Two weeks ago, I changed the fuel filter for the first time in probably 10 years. Boy, that woke it up big time.

I've owned this truck since new in 98. I know how well it ran then. I know right now, it is running as well, if not better than it did then. No muffler in the exhaust. Big giant stainless steel mesh cone filter on a full three inch polished intake tube. JET tuning chip on the ECU. Also have a container under the hood I keep full of E85. There are two hose barbs in said container, one at the bottom, one at the top. The bottom one is hooked to the intake tube by the MAF (metered air). The top one is hooked to the old EVAP vacuum port. When the truck runs, the fluid in the bottle bubbles furiously. The vacuum port inhales the vapors of the bubbling fluid. I had to tune down the idle screw on the bigger than stock TB due to this. It raised the idle speed over 200 rpm. Starts on the first turn of the key every single time.

Recently changed the plugs, wires and coils. Plugs looked excellent after ten years in the thing. Looked like they could do another ten years standing on their heads.

As Alfred E. Neuman says, "What, me worry!"
damn that's crazy
 
damn that's crazy
I know it. But it works, and works well.

Btw, that bottle of E85. Every day, I drive it around 40 miles to and from work. Have to add about 16 ounces of E85 every day. So I guess, if I did the math on the 20..5 just on the fuel tank alone, if I added the 16 ounces of E85, it would drop that mileage down into the 19's. Not a big thing.

I fill a five gallon container with E85. add five ounces of Marvel Mystery Oil to that. And a quart of Isopropyl alcohol. Witches brew. But the truck sure does like it. A lot!
 

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