Gas mileage dropping faster than the stock market, less than 200 to the tank...

[YanaCakes]

what scanner do you currently have? the cheap ones don't usually read that.

It is a little plug in, bluetooth scanner.

 

[YanaCakes]

It is a little plug in, bluetooth scanner.

what scanner do you currently have? the cheap ones don't usually read that.

It does have the option for life monitoring and breaks down the info everyone has told me to get but I don't know that the reading would be accurate on it.

 

[OR VietVet]

This one?! And I have 3.42 ratio.

Gears are a bit high for the tire size. That scanner ad is for the case only. The scanner will do live data but you will need to get up in to Tech 2 or better for lots of info. I just bought an Ancel MK808S for less than $400. I am still playing with it.

 

[j91z28d1]

It does have the option for life monitoring and breaks down the info everyone has told me to get but I don't know that the reading would be accurate on it.

anything it tells you is probably accurate. they just don't normal have the pid info load and display. if they do, it's usually right or completely crazy if it's wrong. like it won't be off a little bit it will either work or not.


what's the fuel trims look like, long term and short term. if they arw postive numbers, that how much fuel. it's adding like say a long term of 10 is adding 10% more fuel.

 

[Doubeleive]

Here's a somewhat detailed video on diagnosing a clogged cat. The last half deals with the analysis of how Wes arrived at the decision to check the backpressure, along with his sketches of how things work -- or should.

eventually this is what happened with me another cat, drove around town fine, but if you tried to go wot anything above 50-60mph it turned into a gutless lawn mower. Going wot for me is a daily thing so I knew something was seriously wrong.
the 3rd cat (not monitored) was clogged up.
I had 5 psi at idle and 10 under throttle

 

[YanaCakes]

Gears are a bit high for the tire size. That scanner ad is for the case only. The scanner will do live data but you will need to get up in to Tech 2 or better for lots of info. I just bought an Ancel MK808S for less than $400. I am still playing with it.

Well its confirmed...I am "touched" lol

 

[vcode]

New YorK? Your mileage will tank in the cold weather we have been having. Especially around town.

 

[fozzi58]

Check the TikTok shop. They are selling a variety of TopDon scanners for $200 or less. I may pick one up myself even though I have a BT one like you plus a full on HP Tuners key.

 

[YanaCakes]

THANK YOU so much for everyone's feedback. I used the scanner I had and took some screen shots. This is idling - truck had just been driven for about 10 min, then sitting for few minutes and started back up to get the values. I tried to show the fluctuation too so I took several screen shots.

 

[YanaCakes]

Here is more.

 

[Hobert]

Here is more.

U sure someone is not syphoning your gas?

 

[Fless]

I'd be concerned about the cats. Nothing in the data seems to be out of place: fuel trims are good and the MAF value is good.

It would be interesting to see a graph of both upstream O2 sensor voltages to see how much and how quickly they're acting. Not sure if your scanner can do that, but it might be valuable data to have.

 

[YanaCakes]

U sure someone is not syphoning your gas?

I got a locking gas cap...

 

[YanaCakes]

I'd be concerned about the cats. Nothing in the data seems to be out of place: fuel trims are good and the MAF value is good.

It would be interesting to see a graph of both upstream O2 sensor voltages to see how much and how quickly they're acting. Not sure if your scanner can do that, but it might be valuable data to have.

I will try to see if it does. And definitely will look into the cats. Thank you!

 

[Fless]

I forgot to ask -- have you pulled a spark plug or two to see how they look? How many miles on them and how long ago where they changed?

 

[Doubeleive]

U sure someone is not syphoning your gas?

when was the last time you tried tried to siphon gas out of one of these suvs?, my guess is it's been a long time because it's not gonna happen unless you take the the filler tube off from the gas tank

 

[ZKWBQD]

Before I sell my soul for gas....I have a 2012 Tahoe LT, 5.3 4WD. The truck has a 3.5 inch lift and sits on 33 inch tires. I was getting around 300-330 to the tank. In the last 2ish years, it has progressively declined to where I can barely get 200 to the tank. I do mostly city driving for reference.

I had an intermittent evap code that comes and goes by itself. About a month ago, I replaced the purge valve and charcoal canister. Also did a smoke test, all good. Code hasn't come back. Gas mileage seemed to be improving andddd then tanked..... Back to under 200 to the tank. This tank may be closer to 150-175 with how it's looking. No other codes, truck runs great, no rough idle.

Please help.

Maybe you're buying the wrong stocks. My portfolio was up in February.

 

[YanaCakes]

I forgot to ask -- have you pulled a spark plug or two to see how they look? How many miles on them and how long ago where they changed?

They were changed about 15-20k. The rear ones were questionable.

I am at an all time low....

 

[YanaCakes]

...

 

[15burban]

Are you leaking gas? You said you can smell gas on start up. Cycle the key to on without starting it and sniff around. You really shouldn't be smelling gas. Salt does a number on the top of the sending units since it never really gets washed out from up there.