The screen was already open. I just held the phone in hand and snapped a shot every few seconds. Doing that at various speeds...gmcman said:On the last pic, your o2 1x1V graph is about what it should look like at cruise with a steady pedal, but still not where it should be.
On the other previous pics, did you take the screenshot after the screen was opened or was it opened the whole time? Reason I ask is when the screen is opened, it takes a fee seconds for the graph to fill in from right to left. If it was left open the whole time, then the upstream o2 sensor is either toast, or you are just getting u metered airflow or unregulated fuel entering the engine and it would appear to be unregulated fuel along with a bad o2 sensor.
So was the screen you have posted opened the whole time, or did you take the screenshot right after it was opened.
Where's the award at? Gotta make one up.BlazingTrails said:Longest tech thread in the History of forums award.
Ummm...sorry:-(...BlazingTrails said:Longest tech thread in the History of forums award.
Dont be. Im just reading along hoping that you will find a resolution before you throw the towel in and get rid of the vehicle. I commend you for the diligence.pcharm129 said:Ummm...sorry:-(...
Thanks. Im really trying. But i definitely have started looking for a replacement... If i find something acceptable before i solve this issue, she's definitely gone. Problem is, i put so much $ and work into her, i'll never get enough for her to feel content...smh. If i can find another EXT, younger, less mileage, loaded, and maybe with a V8, i can swop everything i put on her, THEN get rid of her. Thats my thoughts. Cause i have a lifetime guarantee on many of the parts... Man...even my Alternator cost me $450...DAlastDON said:Dont be. Im just reading along hoping that you will find a resolution before you throw the towel in and get rid of the vehicle. I commend you for the diligence.
Ok...gmcman said:If that were mine, I would gamble on a fuel pressure regulator and a good injector cleaner like the 44K before I threw in the towel.
Ordered them both...gmcman said:If that were mine, I would gamble on a fuel pressure regulator and a good injector cleaner like the 44K before I threw in the towel.
Sorry for the long delay. This is one of my busy months. Im booked all month working like a slave. I got a chance to check the tailpipe. All clear...gmcman said:Do you have any hair like strands of media coming out of the tailpipe? Can you see inside with a flashlight?
Yes, thats the stock pipe in the back. Not sure what that straight piece of metal going across is. I'll get a better flashlight and get a better look...gmcman said:I'm not referring to the tailpipe exit, but the smaller opening farther inside.
Took another look. I believe that metal piece going across is piece of the welding rod...gmcman said:I'm not referring to the tailpipe exit, but the smaller opening farther inside.
Sure doesn't look quite right does it....gmcman said:Can you take a pic of the resonator, that doesn't look at all like the stock tailpipe. The resonator is the last component of the exhaust.
There's a chance this could be the root cause of your problems. Still hard to tell but it looks like a choke point for your exhaust.
Sure doesn't.Tiggerr said:Sure doesn't look quite right does it....
Looks like about a 1" or maybe 1.5" opening at the weld.Sparky said:Looks like he has a res delete. What you're seeing at the end is the welded joint and then the bend in the pipe where it goes over the axle.
I think.
Exactly!Sparky said:Looks like he has a res delete. What you're seeing at the end is the welded joint and then the bend in the pipe where it goes over the axle.
I think.
Its welded...gmcman said:What exhaust is on there now, can you get under and post some pics? Is the entire assembly welded or clamped somewhere? If clamped maybe you can remove the rear portion, I know the factory muffler is pretty quiet to drive without a tailpipe or resonator, quiet enough to not attract any attention.
Nope. Its the stock pipe. There's no restriction. It just looks like a piece of rod got caught in there....gmcman said:Looks like about a 1" or maybe 1.5" opening at the weld.
Its the same diameter of the stock pipe. And no bends... Generic tip. But all that was done long before i had this issue. Years before... And no change thus far. Actually back to the whole 160 per tank thing. Tank just hitting E so this will be my first fill up...gmcman said:Going back to the first page of this thread, the OP stated he did a resonator delete with a straight pipe from the muffler.
What is the diameter of the pipe from the muffler? Does it take the factory path...ie, bends, and what tip is on there?
I have no back pressure, remember? Lol! But yes, its a larger 4inch diameter tip.gmcman said:I cant draw anything on the pic right now but what I'm looking at is the smaller opening at the other end of the tip at the weld. Is it me or does that opening look about half of what the opening should be? Or is that about a 4 or 5" diameter tip thus making the opening in question correct for the application.
Point I'm making is if you have a restricted opening in the exhaust you will have increased backpressure.
Copy that.pcharm129 said:I have no back pressure, remember? Lol! But yes, its a larger 4inch diameter tip.
Now that i think about it, i should have BETTER air flow with the SS grill because the crossbar is vented. Standard grill is not. But I'll still get on that hose...DocBrown said:Yes, that's very strange.
I haven't followed this thread for a while, but in looking at the OP's profile photo something else came to mind. The custom grill shell. I have one on my Sierra. Guess what? Strange O2 sensor behavior. Occasional codes related to MAF and upstream O2. I ended up removing the grill due to trans heat issues while towing down south last week. Magically all my O2 issues went away too. Short story, air flow is critical to getting proper readings on the sensors. Coupled with that small resonator outlet...
Good idea. Any changes to stock air flow can cause issues, even if it seems like it wouldn't. And I put my grill shell back on, couple of days later, SES light again...pcharm129 said:Now that i think about it, i should have BETTER air flow with the SS grill because the crossbar is vented. Standard grill is not. But I'll still get on that hose...